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  • Compound-specific radiocarbon dating  (3)
  • Age, 14C AMS; Age, dated; Age, dated material; Age, dated standard deviation; AWI_Envi; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; Foraminifera; GC; GeoB10054-4; GeoB10058-1; GeoB10066-7; Gravity corer; Gravity corer (Kiel type); Latitude of event; Longitude of event; marine; MUC; MultiCorer; Number of specimens; OR1-1218-C2-BC; PABESIA; Polar Terrestrial Environmental Systems @ AWI; radiocarbon; replicated; sediment; Size fraction; SL; SO184/2; SO213/2; SO213/2_84-2; Sonne; SOPATRA; South Pacific Ocean; Subcore  (2)
  • (Aluminium+Iron)/(Silicon+Potassium+Titanium); 286; Age; AGE; Aluminium; Calcium; Calculated; Depth, composite; DEPTH, sediment/rock; GeoB; GeoB9501-4; Geosciences, University of Bremen; Intercore correlation; Iron; M65/1; Mauritania Canyon; Meteor (1986); MUC; MultiCorer; Potassium; Silicon; Titanium; X-ray fluorescence core scanner (XRF) II, Bremen, (AVAATECH)  (1)
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  • 1
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    Radiocarbon ages of bulk samples of foraminifera, or mean radiocarbon ages of smaller samples of sediment cores (2021)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-11
    Beschreibung: Radiocarbon was measured on mono-specific samples of between 30 and 350 individual foraminiferal tests taken from five different sediment cores. Single samples were taken at each depth with the aim of developing a down-core age-depth model. For cores GeoB10058-1, GeoB10054-4, GeoB10066-7 and OR1-1218-C2-BC, radiocarbon dating was performed by Accelerated Mass Spectrometry (AMS) using a Mini Carbon Dating System (MICADAS) (Wacker et al. 2010) at the Alfred Wegener Institute, Bremerhaven, Germany, and following standard operating procedures. Samples were measured using a graphite target, except for the single sample from OR1-1218-C2-BC with only 30 specimens, for which a gas target was used. Blanks were processed and correction performed according to a procedure in Sun et al. (2020). Radiocarbon dating of the bulk samples from core SO213-84-2 was carried out on the 15th of May 2014, at NOSAMS, Woods Hole Oceanographic Institution and Keck Carbon Cycle AMS Laboratory, University of California, Irvine.
    Schlagwort(e): Age, 14C AMS; Age, dated; Age, dated material; Age, dated standard deviation; AWI_Envi; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; Foraminifera; GC; GeoB10054-4; GeoB10058-1; GeoB10066-7; Gravity corer; Gravity corer (Kiel type); Latitude of event; Longitude of event; marine; MUC; MultiCorer; Number of specimens; OR1-1218-C2-BC; PABESIA; Polar Terrestrial Environmental Systems @ AWI; radiocarbon; replicated; sediment; Size fraction; SL; SO184/2; SO213/2; SO213/2_84-2; Sonne; SOPATRA; South Pacific Ocean; Subcore
    Materialart: Dataset
    Format: text/tab-separated-values, 184 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 2
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    Radiocarbon ages measured on small number of individual foraminifera samples of sediment cores (2021)
    PANGAEA
    Details
    Publikationsdatum: 2023-09-30
    Beschreibung: Radiocarbon was measured on small mono-specific samples of between 3 and 30 individual foraminiferal tests taken from five different sediment cores. Multiple independent samples were taken and measured for each depth at each core. The aim was to be able to estimate the heterogeneity in age between small samples of foraminifera from the same depth and core. Radiocarbon dating was performed by Accelerated Mass Spectrometry (AMS) using a Mini Carbon Dating System (MICADAS) (Wacker et al. 2010) at the Alfred Wegener Institute, Bremerhaven, Germany, using a gas target and following standard operating procedures. Blanks were processed and correction performed according to a procedure in Sun et al. (2020).
    Schlagwort(e): Age, 14C AMS; Age, dated; Age, dated material; Age, dated standard deviation; AWI_Envi; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; Foraminifera; GC; GeoB10054-4; GeoB10058-1; GeoB10066-7; Gravity corer; Gravity corer (Kiel type); Latitude of event; Longitude of event; marine; MUC; MultiCorer; Number of specimens; OR1-1218-C2-BC; PABESIA; Polar Terrestrial Environmental Systems @ AWI; radiocarbon; replicated; sediment; Size fraction; SL; SO184/2; SO213/2; SO213/2_84-2; Sonne; SOPATRA; South Pacific Ocean; Subcore
    Materialart: Dataset
    Format: text/tab-separated-values, 960 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 3
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    (Figure S3) Bulk element concentrations from multicore GeoB9501-4 measured with EDP-XRF spectroscopy (2010)
    PANGAEA
    Details
    Publikationsdatum: 2024-06-25
    Schlagwort(e): (Aluminium+Iron)/(Silicon+Potassium+Titanium); 286; Age; AGE; Aluminium; Calcium; Calculated; Depth, composite; DEPTH, sediment/rock; GeoB; GeoB9501-4; Geosciences, University of Bremen; Intercore correlation; Iron; M65/1; Mauritania Canyon; Meteor (1986); MUC; MultiCorer; Potassium; Silicon; Titanium; X-ray fluorescence core scanner (XRF) II, Bremen, (AVAATECH)
    Materialart: Dataset
    Format: text/tab-separated-values, 378 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 4
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    Timescales of lateral sediment transport in the Panama Basin as revealed by radiocarbon ages of alkenones, total organic carbon and foraminifera (2010)
    Details
    Publikationsdatum: 2022-05-25
    Beschreibung: Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Earth and Planetary Science Letters 290 (2010): 340-350, doi:10.1016/j.epsl.2009.12.030.
    Beschreibung: Paired radiocarbon measurements on haptophyte biomarkers (alkenones) and on cooccurring tests of planktic foraminifera (Neogloboquadrina dutertrei and Globogerinoides sacculifer) from late glacial to Holocene sediments at core locations ME0005-24JC, Y69- 71P, and MC16 from the south-western and central Panama Basin indicate no significant addition of pre-aged alkenones by lateral advection. The strong temporal correspondence between alkenones, foraminifera and total organic carbon (TOC) also implies negligible contributions of aged terrigenous material. Considering controversial evidence for sediment redistribution in previous studies of these sites, our data imply that the laterally supplied material cannot stem from remobilization of substantially aged sediments. Transport, if any, requires syn-depositional nepheloid layer transport and redistribution of low-density or fine-grained components within decades of particle formation. Such rapid and local transport minimizes the potential for temporal decoupling of proxies residing in different grain size fractions and thus facilitates comparison of various proxies for paleoceanographic reconstructions in this study area. Anomalously old foraminiferal tests from a glacial depth interval of core Y69-71P may result from episodic spillover of fast bottom currents across the Carnegie Ridge transporting foraminiferal sands towards the north.
    Beschreibung: This study was funded by the Helmholtz Young Investigators Group „Applications of molecular 14C analysis for the study of sedimentation processes and carbon cycling in marine sediments”. G.M. acknowledges financial support from WHOI postdoctoral scholarship program. T.I.E. was supported by NSF grant OCE-0526268. A.C.M. was supported by NSF grant ATM0602395.
    Schlagwort(e): Compound-specific radiocarbon dating ; Alkenones ; Lateral sediment transport ; Panama Basin ; Eastern Equatorial Pacific
    Repository-Name: Woods Hole Open Access Server
    Materialart: Preprint
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OA)
  • 5
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    An evaluation of 14C age relationships between co-occurring foraminifera, alkenones, and total organic carbon in continental margin sediments (2006)
    American Geophysical Union
    Details
    Publikationsdatum: 2022-05-25
    Beschreibung: Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 20 (2005): PA1016, doi:10.1029/2004PA001103.
    Beschreibung: Radiocarbon age relationships between co-occurring planktic foraminifera, alkenones and total organic carbon in sediments from the continental margins of Southern Chile, Northwest Africa and the South China Sea were compared with published results from the Namibian margin. Age relationships between the sediment components are site-specific and relatively constant over time. Similar to the Namibian slope, where alkenones have been reported to be 1000 to 4500 years older than co-occurring foraminifera, alkenones were significantly (~1000 yrs) older than co-occurring foraminifera in the Chilean margin sediments. In contrast, alkenones and foraminifera were of similar age (within 2σ error or better) in the NW African and South China Sea sediments. Total-organic-matter and alkenone ages were similar off Namibia (age difference TOC-alkenones: 200-700 years), Chile (100-450 years), and NW Africa (360-770 years), suggesting minor contributions of pre-aged terrigenous material. In the South China Sea total organic carbon is significantly (2000-3000 yrs) older due to greater inputs of pre-aged terrigenous material. Age offsets between alkenones and planktic foraminifera are attributed to lateral advection of organic matter. Physical characteristics of the depositional setting, such as sea-floor morphology, shelf width, and sediment composition, may control the age of co-occurring 2 sediment components. In particular, offsets between alkenones and foraminifera appear to be greatest in deposition centers in morphologic depressions. Aging of organic matter is promoted by transport. Age offsets are correlated with organic richness, suggesting that formation of organic aggregate is a key process.
    Beschreibung: GM and MK acknowledge financial support from the WHOI postdoctoral scholarship program. This work was funded by NSF grant OCE-0327405.
    Schlagwort(e): Compound-specific radiocarbon dating ; Alkenones ; High accumulation rate sediments
    Repository-Name: Woods Hole Open Access Server
    Materialart: Article
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OA)
  • 6
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    Aging of marine organic matter during cross-shelf lateral transport in the Benguela upwelling system revealed by compound-specific radiocarbon dating (2010)
    American Geophysical Union
    Details
    Publikationsdatum: 2022-05-25
    Beschreibung: Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 8 (2007): Q09004, doi:10.1029/2007GC001603.
    Beschreibung: Organic matter accumulation and burial on the Namibian shelf and upper slope are spatially heterogeneous and strongly controlled by lateral transport in subsurface nepheloid layers. Much of the material deposited in depo-centers on the slope ultimately derives from the shelf. Supply of organic matter from the shelf involves selective transport of organic matter. We studied these selective transport processes by analyzing the radiocarbon content of co-occurring sediment fractions. Here we present radiocarbon data for total organic carbon as well as three tracers of surface ocean productivity (phytoplankton-derived alkenones, membrane lipids of pelagic crenarchaeota (crenarchaeol), and calcareous microfossils of planktic foraminifera) in core-top and near-surface sediment samples. The samples were collected on the Namibian margin along a shelf-slope transect (85 to 1040 m) at 24°S and from the upper slope depo-center at 25.5°S. In core-top sediments, alkenone ages gradually increased from modern to 3490 radiocarbon years with distance from shore and with water depth. Crenarchaeol, while younger than alkenones, also increased in age with distance offshore. It was concluded that the observed ages were a consequence of cross-shelf transport and associated aging of organic matter. Radiocarbon ages of preserved lipid biomarkers in sediments thus at least partially depend on the relative amount of laterally supplied, pre-aged material present in a sample, highlighting the importance of nepheloid transport for the sedimentation of organic matter over the Namibian margin.
    Beschreibung: This work was funded by NSF grant OCE- 0327405 to T.I.E. and by a Spinoza grant to J.S.S.D. from NWO.
    Schlagwort(e): Compound-specific radiocarbon dating ; Sediment transport
    Repository-Name: Woods Hole Open Access Server
    Materialart: Article
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OA)
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