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  • PANGAEA  (5,007)
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  • 1
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    Unknown
    Organic matter characteristics using lipid biomarker analysis of a rapidly eroding permafrost cliff (2021)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: Organic carbon (OC) stored in Arctic permafrost represents one of Earth's largest and most vulnerable terrestrial carbon pools. Amplified climate warming across the Arctic results in widespread permafrost thaw. Permafrost deposits exposed at river cliffs and coasts are particularly susceptible to thawing processes. Accelerating erosion of terrestrial permafrost along shorelines leads to increased transfer of organic matter (OM) to nearshore waters. However, the amount of terrestrial permafrost carbon and nitrogen as well as the OM quality in these deposits are still poorly quantified. Here, we characterise the sources and the quality of OM supplied to the Lena River at a rapidly eroding permafrost river shoreline cliff in the eastern part of the delta (Sobo-Sise Island). Our multi-proxy approach captures bulk elemental, molecular geochemical and carbon isotopic analyses of late Pleistocene Yedoma permafrost and Holocene cover deposits, discontinuously spanning the last ~52 ka. We show that the ancient permafrost exposed in the Sobo-Sise cliff has a high organic carbon content (mean of about 5 wt%).We found that the OM quality, which we define as the intrinsic potential to further transformation, decomposition, and mineralization, is also high as inferred by the lipid biomarker inventory. The oldest sediments stem from Marine Isotope Stage (MIS) 3 interstadial deposits (dated to 52 to 28 cal kyr BP) and is overlaid by Last Glacial MIS 2 (dated to 28 to 15 cal ka BP) and Holocene MIS 1 (dated to 7–0 cal ka BP) deposits. The relatively high average chain length (ACL) index of n-alkanes along the cliff profile indicates a predominant contribution of vascular plants to the OM composition. The elevated ratio of iso and anteiso-branched FAs relative to long chain (C ≥ 20) n-FAs in the interstadial MIS 3 and the interglacial MIS 1 deposits, suggests stronger microbial activity and consequently higher input of bacterial biomass during these climatically warmer periods. The overall high carbon preference index (CPI) and higher plant fatty acid (HPFA) values as well as high C / N ratios point to a good quality of the preserved OM and thus to a high potential of the OM for decomposition upon thaw. A decrease of HPFA values downwards along the profile probably indicates a relatively stronger OM decomposition in the oldest (MIS 3) deposits of the cliff.
    Keywords: Biomarker; CACOON; Carbon; Changing Arctic Carbon cycle in the cOastal Ocean Near-shore; erosion; n-alkane; n-fatty acids; Siberia; Yedoma
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Unknown
    Organic matter biogeochemistry using lipid biomarker analysis of a rapidly eroding permafrost cliff (2021)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: Organic carbon (OC) stored in Arctic permafrost represents one of Earth’s largest and most vulnerable terrestrial carbon pools. Amplified climate warming across the Arctic results in widespread permafrost thaw. Permafrost deposits exposed at river cliffs and coasts are particularly susceptible to thawing processes. Accelerating erosion of terrestrial permafrost along shorelines leads to increased transfer of organic matter (OM) to nearshore waters. However, the amount of terrestrial permafrost carbon and nitrogen as well as the OM quality in these deposits are still poorly quantified. Here, we characterise the sources and the quality of OM supplied to the Lena River at a rapidly eroding permafrost river shoreline cliff in the eastern part of the delta (Sobo-Sise Island). Our multi-proxy approach captures bulk elemental, molecular geochemical and carbon isotopic analyses of late Pleistocene Yedoma permafrost and Holocene cover deposits, discontinuously spanning the last ~52 ka. We show that the ancient permafrost exposed in the Sobo-Sise cliff has a high organic carbon content (mean of about 5 wt%).We found that the OM quality, which we define as the intrinsic potential to further transformation, decomposition, and mineralization, is also high as inferred by the lipid biomarker inventory. The oldest sediments stem from Marine Isotope Stage (MIS) 3 interstadial deposits (dated to 52 to 28 cal kyr BP) and is overlaid by Last Glacial MIS 2 (dated to 28 to 15 cal ka BP) and Holocene MIS 1 (dated to 7–0 cal ka BP) deposits. The relatively high average chain length (ACL) index of n-alkanes along the cliff profile indicates a predominant contribution of vascular plants to the OM composition. The elevated ratio of iso and anteiso-branched FAs relative to long chain (C ≥ 20) n-FAs in the interstadial MIS 3 and the interglacial MIS 1 deposits, suggests stronger microbial activity and consequently higher input of bacterial biomass during these climatically warmer periods. The overall high carbon preference index (CPI) and higher plant fatty acid (HPFA) values as well as high C / N ratios point to a good quality of the preserved OM and thus to a high potential of the OM for decomposition upon thaw. A decrease of HPFA values downwards along the profile probably indicates a relatively stronger OM decomposition in the oldest (MIS 3) deposits of the cliff.
    Keywords: AGE; AWI Arctic Land Expedition; Biomarker; CACOON; Carbon; Carbon, organic, total; Carbon/Nitrogen ratio; Carbon Preference Index, n-Alkanes; Changing Arctic Carbon cycle in the cOastal Ocean Near-shore; erosion; Event label; Height above river level; Higher plant n-fatty acids, per unit sediment mass; Lithologic unit/sequence; n-alkane; n-Alkane, average chain length; n-Alkanes, long-chain, per unit mass total organic carbon; n-Alkanes, long-chain per unit sediment mass; n-Alkanes, short-chain, per unit mass total organic carbon; n-Alkanes, short-chain per unit sediment mass; n-fatty acids; n-fatty acids, C21-C23, per unit mass total organic carbon; n-fatty acids, C21-C23, per unit sediment mass; n-fatty acids, long-chain, per unit mass total organic carbon; n-fatty acids, long-chain per unit sediment mass; n-fatty acids, per unit mass total organic carbon; n-fatty acids, per unit sediment mass; n-fatty acids, short-chain, per unit mass total organic carbon; n-fatty acids, short-chain per unit sediment mass; Nitrogen, total; PERM; Ratio; RU-Land_2018_Lena_Sobo-Sise; Sample ID; Sampling permafrost; Siberia; SOB18-01; SOB18-03; SOB18-06; Sobo-Sise 2018; Sobo-Sise Island; Sum n-alkanes C14-C35, per unit mass total organic carbon; Sum n-alkanes C14-C35, per unit sediment mass; Yedoma; δ13C, organic matter
    Type: Dataset
    Format: text/tab-separated-values, 545 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 3
    facet.materialart.
    Unknown
    n-Fatty acid composition per total organic carbon in a rapidly eroding permafrost cliff (2022)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: Organic carbon (OC) stored in Arctic permafrost represents one of Earth’s largest and most vulnerable terrestrial carbon pools. Amplified climate warming across the Arctic results in widespread permafrost thaw. Permafrost deposits exposed at river cliffs and coasts are particularly susceptible to thawing processes. Accelerating erosion of terrestrial permafrost along shorelines leads to increased transfer of organic matter (OM) to nearshore waters. However, the amount of terrestrial permafrost carbon and nitrogen as well as the OM quality in these deposits are still poorly quantified. Here, we characterise the sources and the quality of OM supplied to the Lena River at a rapidly eroding permafrost river shoreline cliff in the eastern part of the delta (Sobo-Sise Island). Our multi-proxy approach captures bulk elemental, molecular geochemical and carbon isotopic analyses of late Pleistocene Yedoma permafrost and Holocene cover deposits, discontinuously spanning the last ~52 ka. We show that the ancient permafrost exposed in the Sobo-Sise cliff has a high organic carbon content (mean of about 5 wt%).We found that the OM quality, which we define as the intrinsic potential to further transformation, decomposition, and mineralization, is also high as inferred by the lipid biomarker inventory. The oldest sediments stem from Marine Isotope Stage (MIS) 3 interstadial deposits (dated to 52 to 28 cal kyr BP) and is overlaid by Last Glacial MIS 2 (dated to 28 to 15 cal ka BP) and Holocene MIS 1 (dated to 7–0 cal ka BP) deposits. The relatively high average chain length (ACL) index of n-alkanes along the cliff profile indicates a predominant contribution of vascular plants to the OM composition. The elevated ratio of iso and anteiso-branched FAs relative to long chain (C ≥ 20) n-FAs in the interstadial MIS 3 and the interglacial MIS 1 deposits, suggests stronger microbial activity and consequently higher input of bacterial biomass during these climatically warmer periods. The overall high carbon preference index (CPI) and higher plant fatty acid (HPFA) values as well as high C / N ratios point to a good quality of the preserved OM and thus to a high potential of the OM for decomposition upon thaw. A decrease of HPFA values downwards along the profile probably indicates a relatively stronger OM decomposition in the oldest (MIS 3) deposits of the cliff.
    Keywords: 10-methyl-fatty acid C14:0, per unit mass total organic carbon; 10-methyl-fatty acid C16:0, per unit mass total organic carbon; 10-methyl-fatty acid C17:0, per unit mass total organic carbon; 10-methyl-fatty acid C18:0, per unit mass total organic carbon; 12-methyl-fatty acid C16:0, per unit mass total organic carbon; 12-methyl-fatty acid C18:0, per unit mass total organic carbon; 3-hydroxyl-fatty acid C6:0, per unit mass total organic carbon; 3-hydroxyl-fatty acid C7:0, per unit mass total organic carbon; 3-hydroxyl-fatty acid C8:0, per unit mass total organic carbon; anteiso-fatty acid C11:0, per unit mass total organic carbon; anteiso-fatty acid C12:0, per unit mass total organic carbon; anteiso-fatty acid C13:0, per unit mass total organic carbon; anteiso-fatty acid C15:0, per unit mass total organic carbon; anteiso-fatty acid C17:0, per unit mass total organic carbon; anteiso-fatty acid C17:1, per unit mass total organic carbon; AWI Arctic Land Expedition; Biomarker; CACOON; Carbon; Changing Arctic Carbon cycle in the cOastal Ocean Near-shore; cyclo-fatty acid C17, per unit mass total organic carbon; cyclo-fatty acid C19, per unit mass total organic carbon; erosion; Event label; fatty acid C16:1w5, per unit mass total organic carbon; fatty acid C16:1w7cis, per unit mass total organic carbon; fatty acid C16:1w7trans, per unit mass total organic carbon; fatty acid C18:1w7cis, per unit mass total organic carbon; fatty acid C18:1w7trans, per unit mass total organic carbon; fatty acid C18:1w9, per unit mass total organic carbon; fatty acid C18:2w6,9, per unit mass total organic carbon; Height above river level; iso-fatty acid C10:0, per unit mass total organic carbon; iso-fatty acid C11:0, per unit mass total organic carbon; iso-fatty acid C13:0, per unit mass total organic carbon; iso-fatty acid C14:0, per unit mass total organic carbon; iso-fatty acid C15:0, per unit mass total organic carbon; iso-fatty acid C16:0, per unit mass total organic carbon; iso-fatty acid C17:0, per unit mass total organic carbon; iso-fatty acid C17:1, per unit mass total organic carbon; iso-fatty acid C18:0, per unit mass total organic carbon; iso-fatty acid C19:0, per unit mass total organic carbon; methyl-fatty acid C16:0, per unit mass total organic carbon; methyl-fatty acid C17:0, per unit mass total organic carbon; n-alkane; n-fatty acid C10:0, per unit mass total organic carbon; n-fatty acid C11:0, per unit mass total organic carbon; n-fatty acid C12:0, per unit mass total organic carbon; n-fatty acid C13:0, per unit mass total organic carbon; n-fatty acid C14:0, per unit mass total organic carbon; n-fatty acid C15:0, per unit mass total organic carbon; n-fatty acid C16:0, per unit mass total organic carbon; n-fatty acid C17:0, per unit mass total organic carbon; n-fatty acid C17:1, per unit mass total organic carbon; n-fatty acid C18:0, per unit mass total organic carbon; n-fatty acid C18:3, per unit mass total organic carbon; n-fatty acid C19:0, per unit mass total organic carbon; n-fatty acid C19:1, per unit mass total organic carbon; n-fatty acid C20:0, per unit mass total organic carbon; n-fatty acid C20:1, per unit mass total organic carbon; n-fatty acid C21:0, per unit mass total organic carbon; n-fatty acid C22:0, per unit mass total organic carbon; n-fatty acid C23:0, per unit mass total organic carbon; n-fatty acid C24:0, per unit mass total organic carbon; n-fatty acid C24:1, per unit mass total organic carbon; n-fatty acid C25:0, per unit mass total organic carbon; n-fatty acid C26:0, per unit mass total organic carbon; n-fatty acid C27:0, per unit mass total organic carbon; n-fatty acid C28:0, per unit mass total organic carbon; n-fatty acid C29:0, per unit mass total organic carbon; n-fatty acid C30:0, per unit mass total organic carbon; n-fatty acid C32:0, per unit mass total organic carbon; n-fatty acid C8:0, per unit mass total organic carbon; n-fatty acid C9:0, per unit mass total organic carbon; n-fatty acids; PERM; Phytanoic acid, per unit mass total organic carbon; RU-Land_2018_Lena_Sobo-Sise; Sample ID; Sampling permafrost; Siberia; SOB18-01; SOB18-03; SOB18-06; Sobo-Sise 2018; Sobo-Sise Island; Standard deviation; Stigmastenone, per unit mass total organic carbon; Yedoma
    Type: Dataset
    Format: text/tab-separated-values, 923 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 4
    facet.materialart.
    Unknown
    n-Alkane composition of organic matter in a rapidly eroding permafrost cliff (2021)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: Organic carbon (OC) stored in Arctic permafrost represents one of Earth’s largest and most vulnerable terrestrial carbon pools. Amplified climate warming across the Arctic results in widespread permafrost thaw. Permafrost deposits exposed at river cliffs and coasts are particularly susceptible to thawing processes. Accelerating erosion of terrestrial permafrost along shorelines leads to increased transfer of organic matter (OM) to nearshore waters. However, the amount of terrestrial permafrost carbon and nitrogen as well as the OM quality in these deposits are still poorly quantified. Here, we characterise the sources and the quality of OM supplied to the Lena River at a rapidly eroding permafrost river shoreline cliff in the eastern part of the delta (Sobo-Sise Island). Our multi-proxy approach captures bulk elemental, molecular geochemical and carbon isotopic analyses of late Pleistocene Yedoma permafrost and Holocene cover deposits, discontinuously spanning the last ~52 ka. We show that the ancient permafrost exposed in the Sobo-Sise cliff has a high organic carbon content (mean of about 5 wt%).We found that the OM quality, which we define as the intrinsic potential to further transformation, decomposition, and mineralization, is also high as inferred by the lipid biomarker inventory. The oldest sediments stem from Marine Isotope Stage (MIS) 3 interstadial deposits (dated to 52 to 28 cal kyr BP) and is overlaid by Last Glacial MIS 2 (dated to 28 to 15 cal ka BP) and Holocene MIS 1 (dated to 7–0 cal ka BP) deposits. The relatively high average chain length (ACL) index of n-alkanes along the cliff profile indicates a predominant contribution of vascular plants to the OM composition. The elevated ratio of iso and anteiso-branched FAs relative to long chain (C ≥ 20) n-FAs in the interstadial MIS 3 and the interglacial MIS 1 deposits, suggests stronger microbial activity and consequently higher input of bacterial biomass during these climatically warmer periods. The overall high carbon preference index (CPI) and higher plant fatty acid (HPFA) values as well as high C / N ratios point to a good quality of the preserved OM and thus to a high potential of the OM for decomposition upon thaw. A decrease of HPFA values downwards along the profile probably indicates a relatively stronger OM decomposition in the oldest (MIS 3) deposits of the cliff.
    Keywords: AWI Arctic Land Expedition; Biomarker; CACOON; Carbon; Changing Arctic Carbon cycle in the cOastal Ocean Near-shore; erosion; Event label; Height above river level; n-alkane; n-Alkane C14, per unit mass total organic carbon; n-Alkane C14, per unit sediment mass; n-Alkane C15, per unit mass total organic carbon; n-Alkane C15, per unit sediment mass; n-Alkane C16, per unit mass total organic carbon; n-Alkane C16, per unit sediment mass; n-Alkane C17, per unit mass total organic carbon; n-Alkane C17, per unit sediment mass; n-Alkane C18, per unit mass total organic carbon; n-Alkane C18, per unit sediment mass; n-Alkane C19, per unit mass total organic carbon; n-Alkane C19, per unit sediment mass; n-Alkane C20, per unit mass total organic carbon; n-Alkane C20, per unit sediment mass; n-Alkane C21, per unit mass total organic carbon; n-Alkane C21, per unit sediment mass; n-Alkane C22, per unit mass total organic carbon; n-Alkane C22, per unit sediment mass; n-Alkane C23, per unit mass total organic carbon; n-Alkane C23, per unit sediment mass; n-Alkane C24, per unit mass total organic carbon; n-Alkane C24, per unit sediment mass; n-Alkane C25, per unit mass total organic carbon; n-Alkane C25, per unit sediment mass; n-Alkane C26, per unit mass total organic carbon; n-Alkane C26, per unit sediment mass; n-Alkane C27, per unit mass total organic carbon; n-Alkane C27, per unit sediment mass; n-Alkane C28, per unit mass total organic carbon; n-Alkane C28, per unit sediment mass; n-Alkane C29, per unit mass total organic carbon; n-Alkane C29, per unit sediment mass; n-Alkane C30, per unit mass total organic carbon; n-Alkane C30, per unit sediment mass; n-Alkane C31, per unit mass total organic carbon; n-Alkane C31, per unit sediment mass; n-Alkane C32, per unit mass total organic carbon; n-Alkane C32, per unit sediment mass; n-Alkane C33, per unit mass total organic carbon; n-Alkane C33, per unit sediment mass; n-Alkane C34, per unit mass total organic carbon; n-Alkane C34, per unit sediment mass; n-Alkane C35, per unit mass total organic carbon; n-Alkane C35, per unit sediment mass; n-fatty acids; PERM; RU-Land_2018_Lena_Sobo-Sise; Sample ID; Sampling permafrost; Siberia; SOB18-01; SOB18-03; SOB18-06; Sobo-Sise 2018; Sobo-Sise Island; Yedoma
    Type: Dataset
    Format: text/tab-separated-values, 1294 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 5
    facet.materialart.
    Unknown
    Effects of increased CO2 concentration on nutrient limited coastal summer plankton depend on temperature (2015)
    PANGAEA
    In:  Supplement to: Paul, Carolin; Sommer, Ulrich; Garzke, Jessica; Moustaka-Gouni, Maria; Paul, Allanah Joy; Matthiessen, Birte (2016): Effects of increased CO2 concentration on nutrient limited coastal summer plankton depend on temperature. Limnology and Oceanography, 61(3), 853-868, https://doi.org/10.1002/lno.10256
    Details
    Publication Date: 2023-04-25
    Description: Increasing seawater temperature and CO2 concentrations both are expected to increase coastal phytoplankton biomass and carbon to nutrient ratios in nutrient limited seasonally stratified summer conditions. This is because temperature enhances phytoplankton growth while grazing is suggested to be reduced during such bottom-up controlled situations. In addition, enhanced CO2 concentrations potentially favor phytoplankton species, that otherwise depend on costly carbon concentrating mechanisms (CCM). The trophic consequences for consumers under such conditions, however, remain little understood. We set out to experimentally explore the combined effects of increasing temperature and CO2 concentration for phytoplankton biomass and stoichiometry and the consequences for trophic transfer (here for copepods) on a natural nutrient limited Baltic Sea summer plankton community. The results show, that warming effects were translated to the next trophic level by switching the system from a bottom-up controlled to a mainly top-down controlled one. This was reflected in significantly down-grazed phytoplankton and increased zooplankton abundance in the warm temperature treatment (22.5°C). Additionally, at low temperature (16.5°C) rising CO2 concentrations significantly increased phytoplankton biomass. The latter effect however, was due to direct negative impact of CO2 on copepod nauplii which released phytoplankton from grazing in the cold but not in the warm treatments. Our results suggest that future seawater warming has the potential to switch trophic relations between phytoplankton and their grazers under nutrient limited conditions with the consequence of potentially disguising CO2 effects on coastal phytoplankton biomass.
    Keywords: BIOACID; Biological Impacts of Ocean Acidification
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 6
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    An integrated biostratigraphy (conodonts and foraminifers) and chronostratigraphy (paleomagnetic reversals, magnetic susceptibility, elemental chemistry, carbon isotopes and geochronology) for the Permian-Triassic strata of Guandao section (2015)
    PANGAEA
    In:  Supplement to: Lehrmann, Daniel; Stepchinski, Leanne; Altiner, Demir; Orchard, Michael J; Montgomery, Paul; Enos, Paul; Ellwood, Brooks B; Bowring, Samuel A; Ramezani, Jahandar; Wang, Hongmei; Wei, Jiayong; Yu, Meiyi; Griffiths, James D; Minzoni, Marcello; Schaal, Ellen K; Li, Xiaowei; Meyer, Katja M; Payne, Jonathan L (2015): An integrated biostratigraphy (conodonts and foraminifers) and chronostratigraphy (paleomagnetic reversals, magnetic susceptibility, elemental chemistry, carbon isotopes and geochronology) for the Permian–Upper Triassic strata of Guandao section, Nanpanjiang Basin, south China. Journal of Asian Earth Sciences, 108, 117-135, https://doi.org/10.1016/j.jseaes.2015.04.030
    Details
    Publication Date: 2023-07-10
    Description: The chronostratigraphy of Guandao section has served as the foundation for numerous studies of the end-Permian extinction and biotic recovery in south China. Guandao section is continuous from the Permian-Triassic boundary to the Upper Triassic. Conodonts enable broad delineation of stage and substage boundaries and calibration of foraminifer biostratigraphy as follows. Changhsingian-Griesbachian: first Hindeodus parvus, and first appearance of foraminifers Postcladella kalhori and Earlandia sp. Griesbachian-Dienerian: first Neospathodus dieneri, and last appearance of foraminifer P. grandis. Dienerian-Smithian: first Novispathodus waageni and late Dienerian first appearance of foraminifer Hoyenella ex gr. sinensis. Smithian-Spathian: first Nv? crassatus and last appearance of foraminifers Arenovidalina n. sp. and Glomospirella cf. vulgaris. Spathian-Aegean: first Chiosella timorensis and first appearance of foraminifer Meandrospira dinarica. Aegean-Bithynian: first Nicoraella germanica and first appearance of foraminifer Pilammina densa. Bithynian-Pelsonian: after last Neogondolella regalis, prior to first Paragondolella bulgarica and first appearance of foraminifer Aulotortus eotriasicus. Pelsonian-Illyrian: first Pg. excelsa and last appearance of foraminifers Meandrospira? deformata and Pilamminella grandis. Illyrian-Fassanian: first Budurovignathus truempyi, and first appearance of foraminifers Abriolina mediterranea and Paleolituonella meridionalis. Fassanian-Longobardian: first Bv. mungoensis and last appearance of foraminifer A. mediterranea. Longobardian-Cordevolian: first Quadralella polygnathiformis and last appearance of foraminifers Turriglomina mesotriasica and Endotriadella wirzi. The section contains primary magnetic signature with frequent reversals occurring around the Permian-Triassic, Olenekian-Anisian, and Anisian-Ladinian boundaries. Predominantly normal polarity occurs in the lower Smithian, Bithynian, and Longobardian-Cordevolian. Predominantly reversed polarity occurs in the upper Griesbachian, Induan-Olenekian, Pelsonian and lower Illyrian. Reversals match well with the GPTS. Large amplitude carbon isotope excursions, attaining values as low as -2.9 per mil d13C and high as +5.7 per mil d13C, characterize the Lower Triassic and basal Anisian. Values stabilize around +2 per mil d13C through the Anisian to Carnian. Similar signatures have been reported globally. Magnetic susceptibility and synthetic gamma ray logs show large fluctuations in the Lower Triassic and an overall decline in magnitude of fluctuation through the Middle and Upper Triassic. The largest spikes in magnetic susceptibility and gamma ray, indicating greater terrestrial lithogenic flux, correspond to positive d13C excursions. High precision U-Pb analysis of zircons from volcanic ash beds provide a robust age of 247.28 ± 0.12 Ma for the Olenekian-Anisian boundary at Guandao and an age of 251.985 ± 0.097 Ma for the Permian-Triassic boundary at Taiping. Together, the new U-Pb geochronology from the Guandao and Taiping sections suggest an estimated duration of 4.71 ± 0.15 Ma for the Early Triassic Epoch.
    Keywords: Abriolina mediterranea; Agathammina sp.; Age, dated; Age, dated standard error; Age, Uranium-Lead; Arenovidalina sp.; Aulotortus eotriasicus; Austrocolomia marschalli; Bianyang, Guizhou, China; Budurovignathus hungaricus; Budurovignathus mungoensis; Budurovignathus truempyi; Chemical Gamma Ray; Chiosella gondolelloides; Chiosella timorensis; Clarkina changxingensis; Conservatella conservativa; Cornudina sp.; Cratognathus spp; Discretella discreta; Endoteba bithynica; Endoteba controversa; Endotebanella kocaeliensis; Endotebanella sp.; Endoteba obturata; Endotriada thyrrhenica; Endotriadella wirzi; Eurygnathodus sp.; Foraminifera, benthic indeterminata; Galeanella sp.; Gladigondolella carinata; Gladigondolella tethydis; Glomospirella cf. vulgaris; Guandao_Section; Guangxidella bransoni; HAND; Hindeodus anterodentatus; Hindeodus parvus; Hindeodus typicalis; Hoyenella ex gr. sinensis; Inductively coupled plasma - mass spectrometry (ICP-MS); Krikoumbilica pileiformis; Light microscope; Magnetic susceptibility; Magnetometer, cryogenic, 2G-755R, thermal demagnetization; Malayspirina sp.; Mass spectrometer Finnigan MAT 252; Meandrospira cheni; Meandrospira deformata; Meandrospira dinarica; Meandrospira pusilla; Meandrospira sp.; Meandrospirillina irregularis; Mosherella newpassensis; Neogondolella bifurcata; Neogondolella constricta; Neogondolellaregalis; Neogondolella trammeri; Neogondolella transita; Neospathodus crassatus; Neospathodus cristagalli; Neospathodus dieneri; Neospathodus pakistanensis; Neospathodus peculiaris; Neospathodus triangularis; Neostrachanognathus spp.; Nicoraella germanica; Nicoraella kockeli; Nicoraella sp.; Novispathodus abruptus; Novispathodus waageni; Ophthalmidium exiguum; Ophthalmidium spp.; Paleolituonella meridionalis; Paleolituonella reclinata; Paragondolella alpina; Paragondolella bifurcata; Paragondolella bulgarica; Paragondolella excelsa; Paragondolella foliata; Paragondolella fuelopi; Paragondolella inclinata; Piallina bronnimanni; Pilammina densa; Pilamminella grandi; Planiinvoluta mesotriasica; Quadralella polygnathiformis; Quadralella tadpole; Sample code/label; Sampling by hand; SECTION, height; Spathicuspus spathi; Susceptibility bridge; Tolypammina gregaria; Triadodiscus sp.; Triassospathodus brochus; Triassospathodus homeri; Triassospathodus symmetricus; Trochammina almtalensis; Turriglomina carnica; Turriglomina cf. magna; Turriglomina mesotriasica; Turrispirillina sp.; Virtual geomagnetic pole latitude; δ13C, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 93579 data points
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  • 7
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    Country-level mangrove soil carbon stocks and losses (2017)
    PANGAEA
    In:  UTAH STATE UNIV
    Details
    Publication Date: 2023-07-10
    Keywords: Aegiceras; Avicennia; Bruguiera; Carbon dioxid emissions, potential; Carbon loss, annual, potential; Ceripos; Conocarpus; Country; Description; Excoecaria; Group; Habitat loss, annual; Hemisphere; Heritiera; Kandelia; Laguncularia; LATITUDE; LONGITUDE; Lumnitzera; Mangrove area; Number of genera; Nypa; Reference/source; Rhizophora; Sample ID; Soil carbon stock; Sonneratia; Stock loss; Total stocks; Xylocarpus
    Type: Dataset
    Format: text/tab-separated-values, 33960 data points
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    DATA PANGAEA
  • 8
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    (Table S2a) Nannofossil species richness in the Bass River section
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Bass_River_Site; Biantholithus australis; Biscutum sp.; Blackites spp.; BR; Braarudosphaera bigelowii; Calcidiscus bicircus; Calcidiscus pacificanus; Calciosolenia aperta; Calciosolenia murrayi; Campylosphaera dela; Campylosphaera eroskayi; Chiasmolithus californicus; Chiasmolithus consuetus; Chiasmolithus grandis; Chiasmolithus solitus; Clausicoccus sp.; Coccolithus cf. staurion; Coccolithus pelagicus; Coronocyclus bramlettei; Coronocyclus jordanii; Cruciplacolithus asymmetricus; Cruciplacolithus frequens; Cruciplacolithus latipons; Cyclagelosphaera prima; Cyclicargolithus luminis; DEPTH, sediment/rock; Discoaster anartios; Discoaster araneus; Discoaster binodosus; Discoaster cf. falcatus; Discoaster cf. mohleri; Discoaster diastypus; Discoaster falcatus; Discoaster kuepperi; Discoaster lenticularis; Discoaster limbatus; Discoaster mahmoudii; Discoaster mediosus; Discoaster mohleri; Discoaster multiradiatus; Discoaster salisburgensis; Discoaster splendidus; DRILL; Drilling/drill rig; Ellipsolithus anadoluensis; Ellipsolithus distichus; Ellipsolithus macellus; Fasciculithus alanii; Fasciculithus lillianae; Fasciculithus schaubii; Fasciculithus sidereus; Fasciculithus sp.; Fasciculithus thomasii; Fasciculithus tonii; Fasciculithus tympaniformis; Goniolithus fluckigeri; Heliolithus sp.; Holococcoliths; Hornibrookina arca; Jakubowskia leoniae; Leg174AX; Lophodolithus nascens; Markalius apertus; Markalius inversus; Micrantholithus attenuatus; Nannofossils indeterminata; Nannofossils preservation; Neochiastozygus cf. junctus; Neochiastozygus concinnus; Neochiastozygus distentus; Neochiastozygus imbriei; Neochiastozygus junctus; Neococcolithes dubius; Neococcolithes protenus; Neocrepidolithus grandiculus; North American East Coast; Placoliths, small; Pontosphaera exilis; Pontosphaera ocellata; Pontosphaera plana; Pontosphaera rimosa; Pontosphaera scissura; Prinsius bisulcus; Rhomboaster bramlettei; Rhomboaster cuspis; Rhomboaster spineus; Sample thickness; Sphenolithus editus; Sphenolithus moriformis; Sphenolithus primus; Toweius callosus; Toweius eminens; Toweius occultatus; Toweius pertusus; Toweius serotinus; Tribrachiatus orthostylus; Zeugrhabdotus sigmoides; Zygodiscus plectopons; Zygodiscus sheldoniae; Zygrhablithus bijugatus
    Type: Dataset
    Format: text/tab-separated-values, 5333 data points
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  • 9
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    Revised composite depth scale and splice analysis using detailed hole-to-hole correlations of high-resolution x-ray fluorescence core scanning for IODP Site 342-U1406 (2017)
    PANGAEA
    In:  Supplement to: van Peer, Tim E; Liebrand, Diederik; Xuan, Chuang; Lippert, Peter C; Agnini, Claudia; Blum, Nevin; Blum, Peter; Bohaty, Steven M; Bown, Paul R; Greenop, Rosanna; Kordesch, Wendy E C; Leonhardt, Dominik; Friedrich, Oliver; Wilson, Paul A (2017): Data report: revised composite depth scale and splice for IODP Site U1406. In: Proceedings of the IODP, Integrated Ocean Drilling Program, https://doi.org/10.2204/iodp.proc.342.202.2017
    Details
    Publication Date: 2023-07-24
    Description: Integrated Ocean Drilling Program (IODP) Expedition 342 recovered exceptional Paleogene to early Neogene sedimentary archives from clay-rich sediments in the northwest Atlantic Ocean. These archives present an opportunity to study Cenozoic climate in a highly sensitive region at often unprecedented resolution. Such studies require continuous records in the depth and time domains. Using records from multiple adjacent drilled holes, intervals within consecutive cores are typically spliced into a single composite record on board the R/V JOIDES Resolution using high-resolution physical properties data sets acquired before the cores are split. The highly dynamic nature of the sediment drifts drilled during Expedition 342 and the modest amplitude of variance in the physical property records made it possible to construct only highly tentative initial working splices, which require extensive postexpedition follow-up work. Postexpedition, high-resolution X-ray fluorescence (XRF) core scanning data enabled the construction of a preliminary composite depth scale and splice. Here, we present the revised composite depth scale and splice for IODP Site U1406, predominantly constructed using detailed hole-to-hole correlations of newly generated high-resolution XRF data and revisions of the initial XRF data set. The revised composite depth scale and splice serve as a reference framework for future research on Site U1406 sediments.
    Keywords: Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP
    Type: Dataset
    Format: application/zip, 14 datasets
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  • 10
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    New composite bio- and isotope stratigraphies spanning the Middle Eocene Climatic Optimum at tropical ODP Site 143-865 in the Pacific Ocean (2020)
    PANGAEA
    Details
    Publication Date: 2023-07-24
    Description: The Middle Eocene Climatic Optimum (MECO) at ca. 40 Ma is one of the largest of the transient Eocene global warming events. However, it is relatively poorly known from tropical settings since few sites span the entirety of the MECO event and/or host calcareous microfossils, which are the dominant proxy carrier for palaeoceanographic reconstructions. Ocean Drilling Program (ODP) Pacific Ocean Site 143-865 in the low-latitude North Pacific (Allison Guyot) has the potential to provide a useful tropical MECO reference but detailed stratigraphic and chronological constraints needed to evaluate its completeness were previously lacking. We have addressed this deficit by generating new high-resolution biostratigraphic, stable isotope and X-ray fluorescence (XRF) records spanning the MECO interval (~38.0-43.0 Ma) in two holes drilled at Site 143-865. XRF-derived strontium/calcium (Sr/Ca) and barium/strontium (Ba/Sr) ratio and Fe count records allow correlation between holes and reveal pronounced rhythmicity, enabling us to develop the first composite section for Holes 143-865B and 143-865C and a preliminary cyclostratigraphy for the MECO. Using this new framework, the sedimentary record is interpreted to be continuous across the event, as identified by a pronounced transient benthic foraminiferal δ¹⁸O shift of ~0.8‰. Calcareous microfossil biostratigraphic events from widely used zonation schemes are recognized, with generally good agreement between the two holes, highlighting the robustness of the new composite section and allowing us to identify planktic foraminiferal Zones E10-E15 and calcareous nannofossil Zones NP15-18. However, discrepancies in the relative position and ordering of several primary and secondary bioevents with respect to published schemes are noted. Specifically, the stratigraphic highest occurrences of planktic foraminifera Acarinina bullbrooki, Guembelitrioides nuttalli, and Morozovella aragonensis, and calcareous nannofossils Chiasmolithus solitus and Sphenolithus furcatolithoides and the lowest occurrence of Reticulofenestra reticulata, all appear higher in the section than would be predicted relative to other bioevents. We also note conspicuous reworking of older microfossils (from planktic foraminiferal Zones E5-E9 and E13) into younger sediments (planktic foraminiferal Zones E14-15) within our study interval consistent with reworking above the MECO interval. Regardless of reworking, the high-quality XRF records enable decimeter scale correlation between holes and highlight the potential of Site 143-865 for constraining tropical environmental and biotic changes, not just across the MECO but also throughout the Paleocene and early-to-middle Eocene interval.
    Type: Dataset
    Format: application/zip, 14 datasets
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