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  • 1
    Electronic Resource
    Electronic Resource
    Comparison of one- and two-color ionization schemes for the analysis for osmium and rhenium isotopic ratios by sputter-induced resonance ionization mass spectrometry (1992)
    s.l. : American Chemical Society
    Analytical chemistry 64 (1992), S. 2623-2627 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00045a027
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Extraterrestrial 3 He as a tracer of marine sediment transport and accumulation (1996)
    [s.l.] : Nature Publishing Group
    Nature 383 (1996), S. 705-707 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The residence time of dissolved 230Th in the ocean with respect to sorption by marine particulate phases is sufficiently short that, to a first approximation, the rain rate of particulate 230Th sinking to the sea bed, FTh, is equivalent to the integrated rate of 230Th production by U decay in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/383705a0
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  • 3
    Electronic Resource
    Electronic Resource
    1.1 Ga K-rich alkaline plutonism in the SW Grenville Province (1990)
    Springer
    Contributions to mineralogy and petrology 105 (1990), S. 473-485 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract U−Pb zircon and baddeleyite dating of six syenitic stocks establishes that the ultrapotassic, potassic alkaline and shoshonitic magmatism with island-arc affinities in the Central Metasedimentary Belt (CMB) of the southwestern Grenville Province, Canada took place between 1089 and 1076 Ma, along a 400-km-long, northeast-trending plutonic belt. These ages indicate that ultrapotassic rocks with arc affinities are not unique to the Phanerozoic. West to east emplacement ages along a northern and southern cross-section of this belt range from 1083±2 Ma (Kensington), through 1081±2 Ma (Lac Rouge) to 1076 −1 +3 Ma (Loranger) in the north, and from 1089 −3 +4 Ma (loon Lake) and 1088±2 Ma (Calabogie), to 1076±2 Ma (Westport) in the south. Although closely spaced in time, in detail these ages suggest a slight younging of this magmatic activity to the southeast. Integration of the geochronological data with the spatial extent and potassic character of the plutons shows that the K-rich alkaline suite is distinct from the nepheline-syenite belt of the Bancroft terrane and from the syenite-monzonite suite of the Frontenac terrane of the CMB, and it is considered to be a magmatic episode unique to the Elzevir terrane and its Gatineau segment. The timing and the postmetamorphic emplacement of these plutons indicate that the regional greenschist to granulite-facies metamorphism of the country rock (precise age unknown) is older than 1089 Ma throughout the entire Elzevir terrane. The potassic magmatism is interpreted as the initiation of the 1090–1050 Ma Ottawan Orogeny in the Elzevir terrane; thus, the regional metamorphism in this terrane, previously assigned to the Ottawan Orogeny, is an earlier event. The contemporaneous emplacement of this postmetamorphic plutonic belt with Keweenawan volcanism is at variance with current tectonic models which consider the Keweenawan rift to be formed at the same time as regional metamorphism in the CMB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00286834
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  • 4
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    Nd isotope composition of sediment cores from the Florida Straits
    PANGAEA
    In:  Supplement to: Xie, Ruifang C; Marcantonio, Franco; Schmidt, Matthew W (2012): Deglacial variability of Antarctic Intermediate Water penetration into the North Atlantic from authigenic neodymium isotope ratios. Paleoceanography, 27(3), PA3221, https://doi.org/10.1029/2012PA002337
    Details
    Publication Date: 2023-05-12
    Description: Understanding intermediate water circulation across the last deglacial is critical in assessing the role of oceanic heat transport associated with Atlantic Meridional Overturning Circulation variability across abrupt climate events. However, the links between intermediate water circulation and abrupt climate events such as the Younger Dryas (YD) and Heinrich Event 1 (H1) are still poorly constrained. Here, we reconstruct changes in Antarctic Intermediate Water (AAIW) circulation in the subtropical North Atlantic over the past 25 kyr by measuring authigenic neodymium isotope ratios in sediments from two sites in the Florida Straits. Our authigenic Nd isotope records suggest that there was little to no penetration of AAIW into the subtropical North Atlantic during the YD and H1. Variations in the northward penetration of AAIW into the Florida Straits documented in our authigenic Nd isotope record are synchronous with multiple climatic archives, including the Greenland ice core d18O record, the Cariaco Basin atmosphere Delta14C reconstruction, the Bermuda Rise sedimentary Pa/Th record, and nutrient and stable isotope data from the tropical North Atlantic. The synchroneity of our Nd records with multiple climatic archives suggests a tight connection between AAIW variability and high-latitude North Atlantic climate change.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 5
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    Biogenic barium flux in the eastern equatorial Pacific Ocean (2020)
    PANGAEA
    Details
    Publication Date: 2023-02-08
    Description: We present the first regional-scale records of biogenic Barium (xsBa) fluxes in the Panama basin of the eastern-equatorial margin of the Pacific Ocean in order to assess xsBa as a paleoproductivity proxy. Measurements of xsBa from thirteen cores that range in water depths from about 700 ¬¬to 3000 m show an increase in 230Th normalized xsBa mass accumulation rates (MARs) with increasing water depth during both Marine Oxygen Isotope Stages (MIS) 1 and 2. The correlation of xsBa MARs with depth are strong despite differences in bulk sediment mass accumulation rates and differing degrees of sediment redistribution. We interpret the increasing xsBa with water depth as likely due to the continued decomposition and remineralization of falling and/or resuspended biogenic particles. xsBa does not seem to be affected by diagenetic sulfate reduction in most of the cores. Calculated estimates of xsBa preservation in the sediment pile are high and fluctuate between 45% - 52% throughout the last 25 kyr. Although xsBa fluxes can be a robust indicator of paleoproductivity, caution is needed if a) there is evidence of sulfate reduction in sediments being analyzed, and b) one is trying to quantify differences in paleoproductivity among sites that are located at different depths in the water column.
    Keywords: 230Th; AGE; Aluminium; authigenic Uranium (Uauth); Barite dissolution; Barium; Barium excess; Biogenic Barium (xsBa); DEPTH, sediment/rock; Eastern Equatorial Pacific Ocean; Event label; Latitude of event; Longitude of event; Melville; MUC; MultiCorer; MV1014; MV1014-01-1MC; MV1014-01-7MC; MV1014-02-16MC; MV1014-02-9MC; paleoproductivity; Panama Basin
    Type: Dataset
    Format: text/tab-separated-values, 124 data points
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  • 6
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    (Table S1) Age determination of sediment core KNR166-2_51
    PANGAEA
    In:  Supplement to: Schmidt, Matthew W; Weinlein, William A; Marcantonio, Franco; Lynch-Stieglitz, Jean (2012): Solar forcing of Florida Straits surface salinity during the early Holocene. Paleoceanography, 27(3), PA3204, https://doi.org/10.1029/2012PA002284
    Details
    Publication Date: 2023-06-27
    Description: Previous studies showed that sea surface salinity (SSS) in the Florida Straits as well as Florida Current transport covaried with changes in North Atlantic climate over the past two millennia. However, little is known about earlier Holocene hydrographic variability in the Florida Straits. Here, we combine Mg/Ca-paleothermometry and stable oxygen isotope measurements on the planktonic foraminifera Globigerinoides ruber (white variety) from Florida Straits sediment core KNR166-2 JPC 51 (24° 24.70' N, 83° 13.14' W, 198 m deep) to reconstruct a high-resolution (~25 yr/sample) early to mid Holocene record of sea surface temperature and d18OSW (a proxy for SSS) variability. After removing the influence of global d18OSW change due to continental ice volume variability, we find that early Holocene SSS enrichments are associated with increased evaporation/precipitation ratios in the Florida Straits during periods of reduced solar forcing, increased ice rafted debris in the North Atlantic and the development of more permanent El Niño-like conditions in the eastern equatorial Pacific. When considered with previous high-resolution reconstructions of Holocene tropical atmospheric circulation changes, our results provide evidence that variations in solar forcing over the early Holocene had a significant impact on the global tropical hydrologic cycle.
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; DEPTH, sediment/rock; Florida Strait; KN166-2; Knorr; KNR166-2; KNR166-2-51; Laboratory code/label; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 35 data points
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  • 7
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    Uranium radionuclides and organic biomarkers in sediment core RC27-42 (2014)
    PANGAEA
    In:  Supplement to: Pourmand, Ali; Marcantonio, Franco; Bianchi, Thomas S; Canuel, Elizabeth A; Waterson, Elizabeth J (2007): A 28-ka history of sea surface temperature, primary productivity and planktonic community variability in the western Arabian Sea. Paleoceanography, 22(4), PA4208, https://doi.org/10.1029/2007PA001502
    Details
    Publication Date: 2023-06-27
    Description: Uranium series radionuclides and organic biomarkers, which represent major groups of planktonic organisms, were measured in western Arabian Sea sediments that span the past 28 ka. Variability in the past strength of the southwest and northeast monsoons and its influence on primary productivity, sea surface temperature (SST), and planktonic community structure were investigated. The average alkenone-derived SST for the last glacial period was ~3°C lower than that measured for the Holocene. Prior to the deglacial, the lowest SSTs coincide with the highest measured fluxes of organic biomarkers, which represent primarily a planktonic suite of diatoms, coccolithophorids, dinoflagellates, and zooplankton. We propose that intensification of winter northeast monsoon winds during the last glacial period resulted in deep convective mixing, cold SSTs and enhanced primary productivity. In contrast, postdeglacial (〈17 ka) SSTs are warmer during times in which biomarker fluxes are high. Associated with this transition is a planktonic community structure change, in which the ratio of the average cumulative flux of diatom biomarkers to the cumulative flux of coccolithophorid biomarkers is twice as high during the deglacial and Holocene than the average ratio during the last glacial period. We suggest that this temporal transition represents a shift from a winter northeast monsoon-dominated (pre-17 ka) to a summer southwest monsoon-dominated (post-17 ka) wind system.
    Keywords: Indian Ocean; PC; Piston corer; RC27; RC27-42; Robert Conrad
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 8
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    Biogenic sedimentation of DSDP Site 85-574
    PANGAEA
    In:  Supplement to: Piela, Christine; Lyle, Mitchell W; Marcantonio, Franco; Baldauf, Jack G; Olivarez Lyle, Annette (2012): Biogenic sedimentation in the equatorial Pacific: Carbon cycling and paleoproduction, 12–24 Ma. Paleoceanography, 27(2), PA2204, https://doi.org/10.1029/2011PA002236
    Details
    Publication Date: 2023-06-27
    Description: The equatorial Pacific is an important part of the global carbon cycle and has been affected by climate change through the Cenozoic (65 Ma to present). We present a Miocene (12-24 Ma) biogenic sediment record from Deep Sea Drilling Project (DSDP) Site 574 and show that a CaCO3 minimum at 17 Ma was caused by elevated CaCO3 dissolution. When Pacific Plate motion carried Site 574 under the equator at about 16.2 Ma, there is a minor increase in biogenic deposition associated with passing under the equatorial upwelling zone. The burial rates of the primary productivity proxies biogenic silica (bio-SiO2) and biogenic barium (bio-Ba) increase, but biogenic CaCO3 decreases. The carbonate minimum is at ~17 Ma coincident with the beginning of the Miocene climate optimum; the transient lasts from 18 to 15 Ma. Bio-SiO2 and bio-Ba are positively correlated and increase as the equator was approached. Corg is poorly preserved, and is strongly affected by changing carbonate burial. Terrestrial 232Th deposition, a proxy for aeolian dust, increases only after the Site 574 equator crossing. Since surface production of bio-SiO2, bio-Ba, and CaCO3 correlate in the modern equatorial Pacific, the decreased CaCO3 burial rate during the Site 574 equator crossing is driven by elevated CaCO3 dissolution, representing elevated ocean carbon storage and elevated atmospheric CO2. The length of the 17 Ma CaCO3 dissolution transient requires interaction with a 'slow' part of the carbon cycle, perhaps elevated mantle degassing associated with the early stages of Columbia River Basalt emplacement.
    Keywords: 85-574_Site; COMPCORE; Composite Core; Deep Sea Drilling Project; DSDP; Glomar Challenger; Leg85; North Pacific/TROUGH
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 9
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    (Table S1) Carbon and CaCO3 content in sediment core KNR166-2_26
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AGE; Calcium carbonate; Carbon, organic, total; DEPTH, sediment/rock; Florida Strait; KN166-2; Knorr; KNR166-2; KNR166-2-26; KNR166-2-26JPC; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
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  • 10
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    (Table 2) Authigenic Fe-Mn leachate and detrital fraction Nd isotope ratios of sediment core KNR166-2_31
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AGE; DEPTH, sediment/rock; Florida Strait; KN166-2; Knorr; KNR166-2; KNR166-2-31; KNR166-2-31JPC; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; PC; Piston corer; ε-Neodymium; ε-Neodymium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 124 data points
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