A test of (Ge/Si) opal as a paleorecorder of (Ge/Si) seawater
Late Pleistocene variations of germanium to silicon ratios in marine diatom shells from sediment cores, (Ge/Si) opal , are coherent with the global isotope record of glacial to interglacial climate change. These variations are thought to reflect changes in (Ge/Si) seawater driven by climatemodulated...
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ftpubman:oai:pure.mpg.de:item_3173488 2023-08-27T04:06:13+02:00 A test of (Ge/Si) opal as a paleorecorder of (Ge/Si) seawater Bareille, G. Labracherie, M. Mortlock, R. Maier-Reimer, E. Froelich, P. 1998 application/pdf http://hdl.handle.net/21.11116/0000-0005-1F10-7 http://hdl.handle.net/21.11116/0000-0005-1F16-1 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1130/0091-7613(1998)026<0179:ATOGSO>2.3.CO;2 http://hdl.handle.net/21.11116/0000-0005-1F10-7 http://hdl.handle.net/21.11116/0000-0005-1F16-1 Geology info:eu-repo/semantics/article 1998 ftpubman https://doi.org/10.1130/0091-7613(1998)026<0179:ATOGSO>2.3.CO;2 2023-08-02T00:09:28Z Late Pleistocene variations of germanium to silicon ratios in marine diatom shells from sediment cores, (Ge/Si) opal , are coherent with the global isotope record of glacial to interglacial climate change. These variations are thought to reflect changes in (Ge/Si) seawater driven by climatemodulated alterations in oceanic Ge/Si sources and sinks. However, an important criterion for interpreting (Ge/Si) opal as a monitor of whole ocean (Ge/Si) seawater is that the opal burial ratio be insensitive both to local diatom production and surface ocean silica concentrations (so-called biological fractionation effects) and to differential dissolution artifacts (so-called diagenesis offsets). Here we test these assumptions by comparing model ocean sediment (Ge/Si) opal distributions with data from Holocene and glacial sediments across the high-latitude Indian-Antarctic Ocean siliceous ooze belt. In contrast to the model, the data show no gradients in either Holocene or glacial (Ge/Si) opal values across productivity zones displaying dramatic changes in biosiliceous production, opal burial, and dissolution. This evidence supports the contention that fractionation effects are small and that observed down-core variations in (Ge/Si) opal faithfully record secular changes in (Ge/Si) seawater . Article in Journal/Newspaper Antarc* Antarctic Antarctic Ocean Max Planck Society: MPG.PuRe Antarctic Antarctic Ocean Indian |
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Open Polar |
collection |
Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
English |
description |
Late Pleistocene variations of germanium to silicon ratios in marine diatom shells from sediment cores, (Ge/Si) opal , are coherent with the global isotope record of glacial to interglacial climate change. These variations are thought to reflect changes in (Ge/Si) seawater driven by climatemodulated alterations in oceanic Ge/Si sources and sinks. However, an important criterion for interpreting (Ge/Si) opal as a monitor of whole ocean (Ge/Si) seawater is that the opal burial ratio be insensitive both to local diatom production and surface ocean silica concentrations (so-called biological fractionation effects) and to differential dissolution artifacts (so-called diagenesis offsets). Here we test these assumptions by comparing model ocean sediment (Ge/Si) opal distributions with data from Holocene and glacial sediments across the high-latitude Indian-Antarctic Ocean siliceous ooze belt. In contrast to the model, the data show no gradients in either Holocene or glacial (Ge/Si) opal values across productivity zones displaying dramatic changes in biosiliceous production, opal burial, and dissolution. This evidence supports the contention that fractionation effects are small and that observed down-core variations in (Ge/Si) opal faithfully record secular changes in (Ge/Si) seawater . |
format |
Article in Journal/Newspaper |
author |
Bareille, G. Labracherie, M. Mortlock, R. Maier-Reimer, E. Froelich, P. |
spellingShingle |
Bareille, G. Labracherie, M. Mortlock, R. Maier-Reimer, E. Froelich, P. A test of (Ge/Si) opal as a paleorecorder of (Ge/Si) seawater |
author_facet |
Bareille, G. Labracherie, M. Mortlock, R. Maier-Reimer, E. Froelich, P. |
author_sort |
Bareille, G. |
title |
A test of (Ge/Si) opal as a paleorecorder of (Ge/Si) seawater |
title_short |
A test of (Ge/Si) opal as a paleorecorder of (Ge/Si) seawater |
title_full |
A test of (Ge/Si) opal as a paleorecorder of (Ge/Si) seawater |
title_fullStr |
A test of (Ge/Si) opal as a paleorecorder of (Ge/Si) seawater |
title_full_unstemmed |
A test of (Ge/Si) opal as a paleorecorder of (Ge/Si) seawater |
title_sort |
test of (ge/si) opal as a paleorecorder of (ge/si) seawater |
publishDate |
1998 |
url |
http://hdl.handle.net/21.11116/0000-0005-1F10-7 http://hdl.handle.net/21.11116/0000-0005-1F16-1 |
geographic |
Antarctic Antarctic Ocean Indian |
geographic_facet |
Antarctic Antarctic Ocean Indian |
genre |
Antarc* Antarctic Antarctic Ocean |
genre_facet |
Antarc* Antarctic Antarctic Ocean |
op_source |
Geology |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1130/0091-7613(1998)026<0179:ATOGSO>2.3.CO;2 http://hdl.handle.net/21.11116/0000-0005-1F10-7 http://hdl.handle.net/21.11116/0000-0005-1F16-1 |
op_doi |
https://doi.org/10.1130/0091-7613(1998)026<0179:ATOGSO>2.3.CO;2 |
_version_ |
1775347024078569472 |