Ge/Si record of marine biogenic opal
We have determined germanium/silicon ratios in purified diatoms and radiolarians from siliceous sediments in Holocene core tops, one late Pleistocene piston core, and four high-latitude Southern Ocean Deep Sea Drilling Project (DSDP) sites ranging in age from Holocene to Oligocene. High-latitude Hol...
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1989
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.726997 https://doi.org/10.1594/PANGAEA.726997 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.726997 2024-09-15T17:48:05+00:00 Ge/Si record of marine biogenic opal Shemesh, Aldo Mortlock, Richard A Froelich, Philip N MEDIAN LATITUDE: -42.161520 * MEDIAN LONGITUDE: -140.308929 * SOUTH-BOUND LATITUDE: -66.983000 * WEST-BOUND LONGITUDE: 1.276139 * NORTH-BOUND LATITUDE: 60.005000 * EAST-BOUND LONGITUDE: -24.640000 * DATE/TIME START: 1964-01-01T00:00:00 * DATE/TIME END: 1980-02-08T00:00:00 1989 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.726997 https://doi.org/10.1594/PANGAEA.726997 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.726997 https://doi.org/10.1594/PANGAEA.726997 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Shemesh, Aldo; Mortlock, Richard A; Froelich, Philip N (1989): Late Cenozoic Ge/Si record of marine biogenic opal: implications for variations of riverine fluxes to the ocean. Paleoceanography, 4(3), 221-234, https://doi.org/10.1029/PA004i003p00221 28-265 29-278 71-513A 71-514 Antarctic Ocean/BASIN Antarctic Ocean/RIDGE cruise 11 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP ELT11 ELT11-001-PC ELT11-002-PC ELT11-003-PC ELT14 ELT14.005-PC ELT15 ELT15.004-PC ELT15.006-PC ELT17 ELT17.009-PC ELT17.017-PC ELT17.029-PC ELT17.030-PC ELT45 ELT45.063-PC ELT45.064-PC ELT49 ELT49.006-PC ELT49.008-PC ELT49.033-PC ELT50 ELT50.011-PC ELT50.013-PC ELT50.017-PC Eltanin Glomar Challenger IO1176 IO1176.055-PC IO1277 IO1277.010-PC Islas Orcadas Leg28 Leg29 Leg71 PC Piston corer RC11 RC1112 dataset publication series 1989 ftpangaea https://doi.org/10.1594/PANGAEA.72699710.1029/PA004i003p00221 2024-08-21T00:02:25Z We have determined germanium/silicon ratios in purified diatoms and radiolarians from siliceous sediments in Holocene core tops, one late Pleistocene piston core, and four high-latitude Southern Ocean Deep Sea Drilling Project (DSDP) sites ranging in age from Holocene to Oligocene. High-latitude Holocene diatoms in the 10- to 38-µm size fraction ([Ge/Si]opal = 0.693 +/- 0.039 * 10**-6) faithfully record the present oceanic ratio ([Ge/Si]seawater = 0.699 +/- 0.004 * 10**-6). This confirms that diatoms from siliceous oozes are monitors of seawater Ge/Si and may record past changes in rates of delivery of weathering products to the sea from continental and seafloor weathering. Large diatoms and radiolarians display ratios much lower than (Ge/Si)seawater, suggesting that (Ge/Si)opal, to some extent, displays the effects of biological fractionation. From 0 to 2.5 m.y.B.P., (Ge/Si)opal in diatoms from DSDP sites ranges from about 0.54 to 0.70 * 10**-6, similar to the range observed in one late Pleistocene piston core over the last 25 kyr. From 2.5 to 6 m.y.B.P., the ratio is more variable, while prior to 10 m.y.B.P., ratios are clearly higher, averaging about 0.9 * 10**-6 in the early to middle Miocene. Low values of the ratio are consistent with global weathering regimes dominated by river silica input to the sea, while higher ratios suggest periods of enhanced hydrothermal input or reduced fluvial contribution. Nevertheless, an oceanic one-box model with variable river and hydrothermal inputs and biogenic opal output cannot adequately account for the magnitude or the timing of changes observed in the record, suggesting the existence of other sources/sinks for inorganic germanium and/or silicon to or from the sea. Other/Unknown Material Antarc* Antarctic Antarctic Ocean Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(1.276139,-24.640000,60.005000,-66.983000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
28-265 29-278 71-513A 71-514 Antarctic Ocean/BASIN Antarctic Ocean/RIDGE cruise 11 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP ELT11 ELT11-001-PC ELT11-002-PC ELT11-003-PC ELT14 ELT14.005-PC ELT15 ELT15.004-PC ELT15.006-PC ELT17 ELT17.009-PC ELT17.017-PC ELT17.029-PC ELT17.030-PC ELT45 ELT45.063-PC ELT45.064-PC ELT49 ELT49.006-PC ELT49.008-PC ELT49.033-PC ELT50 ELT50.011-PC ELT50.013-PC ELT50.017-PC Eltanin Glomar Challenger IO1176 IO1176.055-PC IO1277 IO1277.010-PC Islas Orcadas Leg28 Leg29 Leg71 PC Piston corer RC11 RC1112 |
spellingShingle |
28-265 29-278 71-513A 71-514 Antarctic Ocean/BASIN Antarctic Ocean/RIDGE cruise 11 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP ELT11 ELT11-001-PC ELT11-002-PC ELT11-003-PC ELT14 ELT14.005-PC ELT15 ELT15.004-PC ELT15.006-PC ELT17 ELT17.009-PC ELT17.017-PC ELT17.029-PC ELT17.030-PC ELT45 ELT45.063-PC ELT45.064-PC ELT49 ELT49.006-PC ELT49.008-PC ELT49.033-PC ELT50 ELT50.011-PC ELT50.013-PC ELT50.017-PC Eltanin Glomar Challenger IO1176 IO1176.055-PC IO1277 IO1277.010-PC Islas Orcadas Leg28 Leg29 Leg71 PC Piston corer RC11 RC1112 Shemesh, Aldo Mortlock, Richard A Froelich, Philip N Ge/Si record of marine biogenic opal |
topic_facet |
28-265 29-278 71-513A 71-514 Antarctic Ocean/BASIN Antarctic Ocean/RIDGE cruise 11 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP ELT11 ELT11-001-PC ELT11-002-PC ELT11-003-PC ELT14 ELT14.005-PC ELT15 ELT15.004-PC ELT15.006-PC ELT17 ELT17.009-PC ELT17.017-PC ELT17.029-PC ELT17.030-PC ELT45 ELT45.063-PC ELT45.064-PC ELT49 ELT49.006-PC ELT49.008-PC ELT49.033-PC ELT50 ELT50.011-PC ELT50.013-PC ELT50.017-PC Eltanin Glomar Challenger IO1176 IO1176.055-PC IO1277 IO1277.010-PC Islas Orcadas Leg28 Leg29 Leg71 PC Piston corer RC11 RC1112 |
description |
We have determined germanium/silicon ratios in purified diatoms and radiolarians from siliceous sediments in Holocene core tops, one late Pleistocene piston core, and four high-latitude Southern Ocean Deep Sea Drilling Project (DSDP) sites ranging in age from Holocene to Oligocene. High-latitude Holocene diatoms in the 10- to 38-µm size fraction ([Ge/Si]opal = 0.693 +/- 0.039 * 10**-6) faithfully record the present oceanic ratio ([Ge/Si]seawater = 0.699 +/- 0.004 * 10**-6). This confirms that diatoms from siliceous oozes are monitors of seawater Ge/Si and may record past changes in rates of delivery of weathering products to the sea from continental and seafloor weathering. Large diatoms and radiolarians display ratios much lower than (Ge/Si)seawater, suggesting that (Ge/Si)opal, to some extent, displays the effects of biological fractionation. From 0 to 2.5 m.y.B.P., (Ge/Si)opal in diatoms from DSDP sites ranges from about 0.54 to 0.70 * 10**-6, similar to the range observed in one late Pleistocene piston core over the last 25 kyr. From 2.5 to 6 m.y.B.P., the ratio is more variable, while prior to 10 m.y.B.P., ratios are clearly higher, averaging about 0.9 * 10**-6 in the early to middle Miocene. Low values of the ratio are consistent with global weathering regimes dominated by river silica input to the sea, while higher ratios suggest periods of enhanced hydrothermal input or reduced fluvial contribution. Nevertheless, an oceanic one-box model with variable river and hydrothermal inputs and biogenic opal output cannot adequately account for the magnitude or the timing of changes observed in the record, suggesting the existence of other sources/sinks for inorganic germanium and/or silicon to or from the sea. |
format |
Other/Unknown Material |
author |
Shemesh, Aldo Mortlock, Richard A Froelich, Philip N |
author_facet |
Shemesh, Aldo Mortlock, Richard A Froelich, Philip N |
author_sort |
Shemesh, Aldo |
title |
Ge/Si record of marine biogenic opal |
title_short |
Ge/Si record of marine biogenic opal |
title_full |
Ge/Si record of marine biogenic opal |
title_fullStr |
Ge/Si record of marine biogenic opal |
title_full_unstemmed |
Ge/Si record of marine biogenic opal |
title_sort |
ge/si record of marine biogenic opal |
publisher |
PANGAEA |
publishDate |
1989 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.726997 https://doi.org/10.1594/PANGAEA.726997 |
op_coverage |
MEDIAN LATITUDE: -42.161520 * MEDIAN LONGITUDE: -140.308929 * SOUTH-BOUND LATITUDE: -66.983000 * WEST-BOUND LONGITUDE: 1.276139 * NORTH-BOUND LATITUDE: 60.005000 * EAST-BOUND LONGITUDE: -24.640000 * DATE/TIME START: 1964-01-01T00:00:00 * DATE/TIME END: 1980-02-08T00:00:00 |
long_lat |
ENVELOPE(1.276139,-24.640000,60.005000,-66.983000) |
genre |
Antarc* Antarctic Antarctic Ocean Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Ocean Southern Ocean |
op_source |
Supplement to: Shemesh, Aldo; Mortlock, Richard A; Froelich, Philip N (1989): Late Cenozoic Ge/Si record of marine biogenic opal: implications for variations of riverine fluxes to the ocean. Paleoceanography, 4(3), 221-234, https://doi.org/10.1029/PA004i003p00221 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.726997 https://doi.org/10.1594/PANGAEA.726997 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.72699710.1029/PA004i003p00221 |
_version_ |
1810289084444180480 |