Quaternary carbonate record of ODP Hole 115-709A, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1999): Quaternary carbonate record from the equatorial Indian Ocean and its relationship with productivity changes. Marine Geology, 161(1), 49-62
The CaCO3 content in Quaternary deep-sea sediments from Pacific and Atlantic oceans have been suggested to respond differently to glacial/interglacial cycles; CaCO3 contents are highest during glacials in the Pacific but highest during interglacials in the Atlantic Ocean. It is not yet clear as to w...
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1999
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Online Access: | https://dx.doi.org/10.1594/pangaea.758731 https://doi.pangaea.de/10.1594/PANGAEA.758731 |
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ftdatacite:10.1594/pangaea.758731 2023-05-15T18:01:11+02:00 Quaternary carbonate record of ODP Hole 115-709A, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1999): Quaternary carbonate record from the equatorial Indian Ocean and its relationship with productivity changes. Marine Geology, 161(1), 49-62 Naidu, Pothuri Divakar Malmgren, Bjorn 1999 application/zip https://dx.doi.org/10.1594/pangaea.758731 https://doi.pangaea.de/10.1594/PANGAEA.758731 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/s0025-3227(99)00055-9 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Drilling/drill rig Leg115 Joides Resolution Ocean Drilling Program ODP Supplementary Collection of Datasets Collection article 1999 ftdatacite https://doi.org/10.1594/pangaea.758731 https://doi.org/10.1016/s0025-3227(99)00055-9 2022-02-08T16:24:46Z The CaCO3 content in Quaternary deep-sea sediments from Pacific and Atlantic oceans have been suggested to respond differently to glacial/interglacial cycles; CaCO3 contents are highest during glacials in the Pacific but highest during interglacials in the Atlantic Ocean. It is not yet clear as to whether a Pacific or an Atlantic pattern of CaCO3 fluctuations dominates the Indian Ocean. We have analyzed the Ocean Drilling Program (ODP) Site 709A from the western equatorial Indian Ocean for the last 1370 ka to determine the relationships between percentages and fluxes of CaCO3 and Quaternary paleoclimatic changes. We also analyzed the coarse (>25 µm) and fine (<25 µm) fractions of CaCO3 in an attempt at estimating the influence of differences in productivity of foraminifera and calcareous nannofossils in shaping the CaCO3 record. Carbon isotopes and Ba/Al ratios were used as indices of productivity. Percentages and fluxes of CaCO3 in the total sediment and <25 µm fraction do not show any clear relationships to glacial/interglacial cycles derived from d18O of the planktonic foraminifera Globigerinoides ruber. This indicates that CaCO3 fluctuations at this site do not show either a Pacific or an Atlantic pattern of CaCO3 fluctuations. Fluxes of CaCO3 (0.38 to 2.46 g/cm**2/ ka) in total sediment and Ba/Al ratios (0.58 to 3.93 g/cm**2/ka) show six-fold variability through the last 1370 ka, which points out that productivity changes are significant at this site. Fluxes of the fine CaCO3 component demonstrate a 26-fold change (0.02 to 0.52 g/cm**2/ka), whereas the coarse CaCO3 component exhibit eight-fold change (0.13 to 1.07 g/cm**2/ka). This suggests that productivity variations of calcareous nannofossils are greater in comparison with the foraminifera. On the other hand, mean values of coarse CaCO3 fluxes are higher compared to those of fine CaCO3, which reveals that the foraminifera contribute more to the bulk CaCO3 flux than the calcareous nannofossils in the equatorial Indian Ocean. Article in Journal/Newspaper Planktonic foraminifera DataCite Metadata Store (German National Library of Science and Technology) Indian Malmgren ENVELOPE(-66.117,-66.117,-65.750,-65.750) Pacific |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Drilling/drill rig Leg115 Joides Resolution Ocean Drilling Program ODP |
spellingShingle |
Drilling/drill rig Leg115 Joides Resolution Ocean Drilling Program ODP Naidu, Pothuri Divakar Malmgren, Bjorn Quaternary carbonate record of ODP Hole 115-709A, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1999): Quaternary carbonate record from the equatorial Indian Ocean and its relationship with productivity changes. Marine Geology, 161(1), 49-62 |
topic_facet |
Drilling/drill rig Leg115 Joides Resolution Ocean Drilling Program ODP |
description |
The CaCO3 content in Quaternary deep-sea sediments from Pacific and Atlantic oceans have been suggested to respond differently to glacial/interglacial cycles; CaCO3 contents are highest during glacials in the Pacific but highest during interglacials in the Atlantic Ocean. It is not yet clear as to whether a Pacific or an Atlantic pattern of CaCO3 fluctuations dominates the Indian Ocean. We have analyzed the Ocean Drilling Program (ODP) Site 709A from the western equatorial Indian Ocean for the last 1370 ka to determine the relationships between percentages and fluxes of CaCO3 and Quaternary paleoclimatic changes. We also analyzed the coarse (>25 µm) and fine (<25 µm) fractions of CaCO3 in an attempt at estimating the influence of differences in productivity of foraminifera and calcareous nannofossils in shaping the CaCO3 record. Carbon isotopes and Ba/Al ratios were used as indices of productivity. Percentages and fluxes of CaCO3 in the total sediment and <25 µm fraction do not show any clear relationships to glacial/interglacial cycles derived from d18O of the planktonic foraminifera Globigerinoides ruber. This indicates that CaCO3 fluctuations at this site do not show either a Pacific or an Atlantic pattern of CaCO3 fluctuations. Fluxes of CaCO3 (0.38 to 2.46 g/cm**2/ ka) in total sediment and Ba/Al ratios (0.58 to 3.93 g/cm**2/ka) show six-fold variability through the last 1370 ka, which points out that productivity changes are significant at this site. Fluxes of the fine CaCO3 component demonstrate a 26-fold change (0.02 to 0.52 g/cm**2/ka), whereas the coarse CaCO3 component exhibit eight-fold change (0.13 to 1.07 g/cm**2/ka). This suggests that productivity variations of calcareous nannofossils are greater in comparison with the foraminifera. On the other hand, mean values of coarse CaCO3 fluxes are higher compared to those of fine CaCO3, which reveals that the foraminifera contribute more to the bulk CaCO3 flux than the calcareous nannofossils in the equatorial Indian Ocean. |
format |
Article in Journal/Newspaper |
author |
Naidu, Pothuri Divakar Malmgren, Bjorn |
author_facet |
Naidu, Pothuri Divakar Malmgren, Bjorn |
author_sort |
Naidu, Pothuri Divakar |
title |
Quaternary carbonate record of ODP Hole 115-709A, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1999): Quaternary carbonate record from the equatorial Indian Ocean and its relationship with productivity changes. Marine Geology, 161(1), 49-62 |
title_short |
Quaternary carbonate record of ODP Hole 115-709A, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1999): Quaternary carbonate record from the equatorial Indian Ocean and its relationship with productivity changes. Marine Geology, 161(1), 49-62 |
title_full |
Quaternary carbonate record of ODP Hole 115-709A, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1999): Quaternary carbonate record from the equatorial Indian Ocean and its relationship with productivity changes. Marine Geology, 161(1), 49-62 |
title_fullStr |
Quaternary carbonate record of ODP Hole 115-709A, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1999): Quaternary carbonate record from the equatorial Indian Ocean and its relationship with productivity changes. Marine Geology, 161(1), 49-62 |
title_full_unstemmed |
Quaternary carbonate record of ODP Hole 115-709A, supplement to: Naidu, Pothuri Divakar; Malmgren, Bjorn (1999): Quaternary carbonate record from the equatorial Indian Ocean and its relationship with productivity changes. Marine Geology, 161(1), 49-62 |
title_sort |
quaternary carbonate record of odp hole 115-709a, supplement to: naidu, pothuri divakar; malmgren, bjorn (1999): quaternary carbonate record from the equatorial indian ocean and its relationship with productivity changes. marine geology, 161(1), 49-62 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1999 |
url |
https://dx.doi.org/10.1594/pangaea.758731 https://doi.pangaea.de/10.1594/PANGAEA.758731 |
long_lat |
ENVELOPE(-66.117,-66.117,-65.750,-65.750) |
geographic |
Indian Malmgren Pacific |
geographic_facet |
Indian Malmgren Pacific |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://dx.doi.org/10.1016/s0025-3227(99)00055-9 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.758731 https://doi.org/10.1016/s0025-3227(99)00055-9 |
_version_ |
1766170552166252544 |