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  • Bay of Bengal  (2)
  • neodymium isotopes  (2)
  • 13.1; 15.1; 15.2; 15.3; 16.1; Angola Basin; Cerium, dissolved; Congo_River_12-1; Congo_River_12-2; Congo_River_12-3; Congo River; CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; Dysprosium, dissolved; Erbium, dissolved; Europium, dissolved; Event label; GA08; Gadolinium, dissolved; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; hafnium; Hafnium, dissolved; Hafnium-176/Hafnium-177; Holmium, dissolved; ICP-MS, Elemental Scientific, seaFAST; IFISH; Iron fish; Isotope dilution; Lanthanum, dissolved; LATITUDE; LONGITUDE; Lutetium, dissolved; M121; M121_1200-1; M121_1202-1; M121_1202-1_fish65; M121_1206-1; M121_1210-1; M121_1210-1_fish69-15.1; M121_1210-1_fish69-15.2; M121_1210-1_fish69-15.3; M121_1212-1; M121_1214-1; M121_1214-1_fish77; M121_1218-1; M121_1222-1; M121_1224-1; M121_1226-1; M121_1228-1; M121_1230-1; M121_1232-1; M121_1234-1; M121_1236-1; M121_1238-1; M121_1240-1; M121_1243-1; M121_1247-1; M121_1248-1; M121_1250-1; Meteor (1986); Neodymium; Neodymium, dissolved; Neodymium-143/Neodymium-144 ratio; Praseodymium, dissolved; RIVER; Salinity; Samarium, dissolved; Sampling river; Southeast Atlantic; South East Atlantic Ocean; Station label; Temperature, water; Terbium, dissolved; Thulium, dissolved; Ytterbium, dissolved; ε-Hafnium; ε-Hafnium, standard deviation; ε-Neodymium; ε-Neodymium, standard deviation  (1)
  • 165-999; AGE; Aluminium/Calcium ratio; Aluminium/Neodymium ratio; Caribbean Sea; COMPCORE; Composite Core; Depth, composite; Iron; Iron/Calcium ratio; Iron/Manganese ratio; Joides Resolution; Leg165; Manganese; Manganese/Calcium ratio; Sample ID  (1)
  • 165-999; AGE; Caribbean Sea; Comment; COMPCORE; Composite Core; Depth, composite; Joides Resolution; Leg165; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; Neodymium-143/Neodymium-144 ratio, standard deviation; Sample ID; ε-Neodymium, error; ε-Neodymium (0); ε-Neodymium (T)  (1)
Document type
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  • 1
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    Authigenic and Detrital Carbonate Nd Isotope Records Reflect Pulses of Detrital Material Input to the Labrador Sea During the Heinrich Stadials (2023)
    Details
    Publication Date: 2023-07-19
    Description: Limited constraints on the variability of the deep‐water production in the Labrador Sea complicate reconstructions of the strength of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Quaternary. Large volumes of detrital carbonates were repeatedly deposited in the Labrador Sea during the last 32 kyr, potentially affecting radiogenic Nd isotope signatures. To investigate this the Nd isotope compositions of deep and intermediate waters were extracted from the authigenic Fe‐Mn oxyhydroxide fraction, foraminiferal coatings, the residual silicates and leachates of dolostone grains. We provide a first order estimation of Nd release via dissolution of detrital carbonates and its contribution to the authigenic ԑNd signatures in the Labrador Sea. During the Last Glacial Maximum the Nd isotope signatures in the Labrador Sea would allow active water mass mixing with more radiogenic ɛNd values (−12.6 and −14) prevailing in its eastern part whereas less radiogenic values (ɛNd ∼ −18.4) were found on the western Labrador slope. The deposition of detrital carbonates during Heinrich stadials (2,1) was accompanied by negative detrital and authigenic Nd isotope excursions (ɛNd ∼ −31) that were likely controlled by dissolution of dolostone or dolostone associated mineral inclusions. This highly unradiogenic signal dominated the authigenic phases and individual water masses in the Labrador Sea, serving as potential source of highly unradiogenic Nd to the North Atlantic region, while exported southward. The Holocene authigenic ɛNd signatures of the coatings and leachates significantly differed from those of the detrital silicates, approaching modern bottom water mass signatures during the Late Holocene.
    Description: Plain Language Summary: The Labrador Sea is an important region for deep water formation and for the ocean circulation in the Atlantic region. Over the last 32 thousand years, numerous discharges from melting glaciers added freshwater to the Labrador Sea which could help understand the future effects of current melting glaciers. This information is necessary to better constrain climate predictions in order to gauge the effects on the Global Ocean Water Circulation. However, past deep water production in the Labrador is still poorly constrained, complicating reconstruction of the Atlantic Meridional Overturning Circulation on different timescales. In this study we investigated changes in deep and intermediate water mass circulation patterns over the last 32 kyr based on the radiogenic Nd isotope compositions that serve as a water mass circulation proxy. Analysis of four marine sediment cores show that the deposition of large volumes of detrital carbonates during studied period had a large effect on the recorded in the sediment column signals. New data suggest active water mass circulation during the maximum extent of glacial ice sheets. The modern day ocean circulation patterns have emerged during the Late Holocene (6 ka).
    Description: Key Points: Estimation of Nd release via dissolution of detrital carbonates and its contribution to the authigenic ԑNd signatures in the Labrador Sea. Dissolution of detrital dolostones in the water column during Heinrich stadials at least partially controlled ɛNd signatures. During the LGM generally more radiogenic signatures possibly indicate active water mass advection and mixing in the Labrador Sea.
    Description: GEOMAR Helmholtz‐Zentrum für Ozeanforschung Kiel http://dx.doi.org/10.13039/501100003153
    Description: Kiel University
    Description: https://doi.org/10.1594/PANGAEA.952659
    Keywords: ddc:551.9 ; Labrador Sea ; Late Quaternary ; Paleoceanography ; neodymium isotopes ; dolostone ; AMOC ; carbonate dissolution ; Heinrich stadials
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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    Persistent Provenance of South Asian Monsoon‐Induced Silicate Weathering Over the Past 27 Million Years (2021)
    Details
    Publication Date: 2021-07-21
    Description: The development of the South Asian monsoon (SAM) and Himalaya‐Tibetan Plateau uplift were closely intertwined with some studies suggesting that uplift initiated the monsoon whereas others link tectonics with monsoon‐controlled exhumation. Silicate weathering controls atmospheric CO2 on geological timescales resulting in a large potential for monsoon strength and the Himalayan orogeny to influence global climate but detailed records of SAM‐induced weathering on million year (Myr) timescales are lacking. Here, we present radiogenic Sr, Nd, and Pb isotope compositions of clay minerals produced by silicate weathering and transported to the central Bay of Bengal. The radiogenic isotope data exhibit a relatively small range and demonstrate a remarkably consistent mixture of sources dominated by Himalayan rocks and the Indo‐Burman ranges, which consist of sediments derived from the Himalayas. This suggests that the spatial pattern of regional weathering, which today is highest in the regions of strongest monsoon rains, has persisted in a similar form for the last 27 Myrs. A pronounced increase in primary clay mineral abundance (from 9% to 22%) coincident with global cooling 13.9 Myrs ago points to a shift in the weathering regime given that the clay provenance did not change dramatically. Relatively weaker chemical weathering intensity during the mid and late Miocene cooling suggests increased aridity and changes in the large scale atmospheric circulation in the SAM domain. The establishment of the dry winter monsoon season during the mid and late Miocene may have caused this shift in the weathering regime and can reconcile much of the contrasting evidence for SAM initiation.
    Description: Key Points: Relatively stable mixture of source rocks weathered to clays over the past 27 Myrs Pronounced increase in primary clay minerals occurred 13.9 Myrs ago Shift in weathering regime possibly result of winter monsoon dry season development
    Keywords: 551.3 ; Bay of Bengal ; clay minerals ; radiogenic Sr, Nd, Pb isotopes ; Silicate silicate weathering ; South Asian monsoon
    Type: article
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    CITATION GEO-LEO
  • 3
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    Provenance and Weathering of Clays Delivered to the Bay of Bengal During the Middle Miocene: Linkages to Tectonics and Monsoonal Climate (2021)
    Details
    Publication Date: 2021-07-21
    Description: Tectonics and regional monsoon strength control weathering and erosion regimes of the watersheds feeding into the Bay of Bengal, which are important contributors to global climate evolution via carbon cycle feedbacks. The detailed mechanisms controlling the input of terrigenous clay to the Bay of Bengal on tectonic to orbital timescales are, however, not yet well understood. We produced orbital‐scale resolution geochemical records for International Ocean Discovery Program Site U1443 (southern Bay of Bengal) across five key climatic intervals of the middle to late Miocene (15.8–9.5 Ma). Our new radiogenic Sr, Nd, and Pb isotope time series of clays transported to the Ninetyeast Ridge suggest that the individual contributions from different erosional sources overall remained remarkably consistent during the Miocene despite major tectonic reorganizations in the Himalayas. On orbital timescales, however, high‐resolution data from the five investigated intervals show marked fluctuations of all three isotope systems. Interestingly, the variability was much higher within the Miocene Climatic Optimum (around 16–15 Ma) and across the major global cooling (~13.9–13.8 Ma) until ~13.5 Ma, than during younger time intervals. This change is attributed to a major restriction on the supply of High Himalayan erosion products due to migration of the peak precipitation area toward the frontal domains of the Himalayas and the Indo‐Burman Ranges. The transient excursions of the radiogenic isotope signals on orbital timescales most likely reflect climatically driven shifts in monsoon strength.
    Description: Key Points: A consistent mix of clay sources contributed to the Bay of Bengal throughout the middle to late Miocene A marked change in detrital Sr, Nd, and Pb isotope variability at 13.5 Ma was related to Miocene global cooling Transient orbital‐scale fluctuations in clay source most likely reflect changes in monsoon intensity
    Description: Deutsche Forschungsgemeinschaft (DFG) http://dx.doi.org/10.13039/501100001659
    Keywords: 551 ; Bay of Bengal ; IODP Site U1443 ; Miocene ; sediment provenance ; Himalayas ; weathering ; erosion
    Type: article
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    CITATION GEO-LEO
  • 4
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    Neodymium isotopes trace marine provenance of Arctic sea ice (2022)
    European Association of Geochemistry
    Details
    Publication Date: 2022-10-12
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Laukert, G., Peeken, I., Bauch, D., Krumpen, T., Hathorne, E. C., Werner, K., Gutjahr, M., & Frank, M. Neodymium isotopes trace marine provenance of Arctic sea ice. Geochemical Perspectives Letters, 22, (2022): 10–15, https://doi.org/10.7185/geochemlet.2220.
    Description: Radiogenic neodymium (Nd) isotopes (ɛNd) have the potential to serve as a geochemical tracer of the marine origin of Arctic sea ice. This capability results from pronounced ɛNd differences between the distinct marine and riverine sources, which feed the surface waters from which the ice forms. The first dissolved Nd isotope and rare earth element (REE) concentration data obtained from Arctic sea ice collected across the Fram Strait during RV Polarstern cruise PS85 in 2014 confirm the incorporation and preservation of the parental surface seawater ɛNd signatures despite efficient REE rejection. The large ɛNd variability between ice floes and within sea ice cores (−32 to −10) reflects changes in water mass distribution during ice growth and drift from the central Arctic Ocean to Fram Strait. In addition to the parental seawater composition, our new approach facilitates the reconstruction of the transfer of matter between the atmosphere, the sea ice and the ocean. In conjunction with satellite-derived drift trajectories, we enable a more accurate assessment of sea ice origin and spatiotemporal evolution, benefiting studies of sea ice biology, biodiversity, and biogeochemistry.
    Description: We acknowledge financial support by the German Federal Ministry of Education and Research (Grant BMBF 03F0776 and 03G0833) and the Ministry of Education and Science of the Russian Federation. GL also acknowledges financial support from the Ocean Frontier Institute through an award from the Canada First Research Excellence Fund.
    Keywords: Arctic Ocean ; Fram Strait ; Greenland ; Transpolar Drift ; Siberian Shelf ; sea ice ; snow ; seawater ; provenance tracers ; neodymium isotopes ; oxygen isotopes ; rare earth elements ; water masses ; circulation
    Repository Name: Woods Hole Open Access Server
    Type: Article
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    PAPER (OA)
  • 5
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    (Table S2b) Trace element composition of weakly cleaned foraminifera for MIS 95-100 from ODP Site 165-999 (2019)
    PANGAEA
    Details
    Publication Date: 2023-12-09
    Keywords: 165-999; AGE; Aluminium/Calcium ratio; Aluminium/Neodymium ratio; Caribbean Sea; COMPCORE; Composite Core; Depth, composite; Iron; Iron/Calcium ratio; Iron/Manganese ratio; Joides Resolution; Leg165; Manganese; Manganese/Calcium ratio; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 333 data points
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    DATA PANGAEA
  • 6
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    (Table S1b) εNd composition of weakly cleaned foraminifera for MIS 95-100 from ODP Site 165-999 (2019)
    PANGAEA
    Details
    Publication Date: 2023-12-09
    Keywords: 165-999; AGE; Caribbean Sea; Comment; COMPCORE; Composite Core; Depth, composite; Joides Resolution; Leg165; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; Neodymium-143/Neodymium-144 ratio, standard deviation; Sample ID; ε-Neodymium, error; ε-Neodymium (0); ε-Neodymium (T)
    Type: Dataset
    Format: text/tab-separated-values, 454 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Neodymium and hafnium isotopes and rare earth element concentrations from water bottle samples measured during METEOR cruise M121 along the Congo River plume (GEOTRACES cruise GA08) (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: To better understand the inputs of riverine REEs and Hf to the ocean and their impact on the open ocean we collected filtered seawater samples from 16 full water column profiles along the Congo River plume at the coast of Congo and Gabon and along an offshore section at 3°S, complemented by three freshwater samples collected directly from the Congo River. The water samples from the Congo River plume were collected during GEOTRACES cruise GA08 with German RV Meteor (M121) in November and December 2015 with a stainless steel CTD rosette and a towed fish for surface waters. River water end-member samples from the Congo River at zero salinity were taken upstream by boat in May, July and October 2017 near the center of the river at ~6°S and ~12.5°E (stations 12.1–12.3). We determine for the first time REE and Hf concentrations and isotope compositions within the Congo River plume and quantify Nd and Hf fluxes. Based on these data we evaluate how far the Congo River plume is traceable by these geochemical parameters, how it contributes to their budgets in the South East Atlantic Ocean, and to which degree the Nd and Hf isotope and REE distributions can be used as water mass tracers in areas of high continental inputs.
    Keywords: 13.1; 15.1; 15.2; 15.3; 16.1; Angola Basin; Cerium, dissolved; Congo_River_12-1; Congo_River_12-2; Congo_River_12-3; Congo River; CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; Dysprosium, dissolved; Erbium, dissolved; Europium, dissolved; Event label; GA08; Gadolinium, dissolved; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; hafnium; Hafnium, dissolved; Hafnium-176/Hafnium-177; Holmium, dissolved; ICP-MS, Elemental Scientific, seaFAST; IFISH; Iron fish; Isotope dilution; Lanthanum, dissolved; LATITUDE; LONGITUDE; Lutetium, dissolved; M121; M121_1200-1; M121_1202-1; M121_1202-1_fish65; M121_1206-1; M121_1210-1; M121_1210-1_fish69-15.1; M121_1210-1_fish69-15.2; M121_1210-1_fish69-15.3; M121_1212-1; M121_1214-1; M121_1214-1_fish77; M121_1218-1; M121_1222-1; M121_1224-1; M121_1226-1; M121_1228-1; M121_1230-1; M121_1232-1; M121_1234-1; M121_1236-1; M121_1238-1; M121_1240-1; M121_1243-1; M121_1247-1; M121_1248-1; M121_1250-1; Meteor (1986); Neodymium; Neodymium, dissolved; Neodymium-143/Neodymium-144 ratio; Praseodymium, dissolved; RIVER; Salinity; Samarium, dissolved; Sampling river; Southeast Atlantic; South East Atlantic Ocean; Station label; Temperature, water; Terbium, dissolved; Thulium, dissolved; Ytterbium, dissolved; ε-Hafnium; ε-Hafnium, standard deviation; ε-Neodymium; ε-Neodymium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 1257 data points
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    DATA PANGAEA
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