(Appendix 1) Age, Ge/Si ratio, aluminium and opal contents in ODP Sites 175-1081 and 175-1084
As a result of both culture and sediment core studies, the ratio of germanium (Ge) to silicon (Si) in diatom shells has been proposed as a proxy for monitoring whole-ocean changes in seawater Ge/Si, a ratio affected by changes in continental weathering. However, because of the difficulties of extrac...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.744050 2023-05-15T13:41:33+02:00 (Appendix 1) Age, Ge/Si ratio, aluminium and opal contents in ODP Sites 175-1081 and 175-1084 Lin, Hui-Ling Chen, Chiau-Ju MEDIAN LATITUDE: -22.566785 * MEDIAN LONGITUDE: 12.173535 * SOUTH-BOUND LATITUDE: -25.513880 * WEST-BOUND LONGITUDE: 11.319300 * NORTH-BOUND LATITUDE: -19.619690 * EAST-BOUND LONGITUDE: 13.027770 * DATE/TIME START: 1997-09-09T02:00:00 * DATE/TIME END: 1997-09-24T03:15:00 * MINIMUM ELEVATION: -1991.9 m * MAXIMUM ELEVATION: -794.1 m 2002-08-11 text/tab-separated-values, 325 data points https://doi.pangaea.de/10.1594/PANGAEA.744050 https://doi.org/10.1594/PANGAEA.744050 en eng PANGAEA Lin, Hui-Ling; Chen, Chiau-Ju (2002): A late Pliocene daitom Ge/Si record from the Southeast Atlantic. Marine Geology, 180(1-4), 151-161, https://doi.org/10.1016/S0025-3227(01)00211-0 https://doi.pangaea.de/10.1594/PANGAEA.744050 https://doi.org/10.1594/PANGAEA.744050 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY 175-1081A 175-1084A AGE Aluminium Benguela Current South Atlantic Ocean DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Germanium/Silica biogenous opal ratio Joides Resolution Leg175 Ocean Drilling Program ODP Opal biogenic silica Sample code/label Dataset 2002 ftpangaea https://doi.org/10.1594/PANGAEA.744050 https://doi.org/10.1016/S0025-3227(01)00211-0 2023-01-20T08:51:22Z As a result of both culture and sediment core studies, the ratio of germanium (Ge) to silicon (Si) in diatom shells has been proposed as a proxy for monitoring whole-ocean changes in seawater Ge/Si, a ratio affected by changes in continental weathering. However, because of the difficulties of extracting and cleaning diatom frustules from deep-sea sediments, only samples from highly pure diatom oozes in the Antarctic region have been previously analyzed. Here we present data on diatom Ge/Si ratios, (Ge/Si)opal, for the time interval between 3.1 and 1.9 Ma from a mid-latitude, coastal upwelling area where significant terrigenous sediment input complicated the sample processing and analyses. In general, our (Ge/Si)opal values show the same decreasing trend after 2.6 Ma than previously measured in Antarctic sediments (Shemesh et al., 1989. Paleoceanography 4, 221-231), but with a noisier background that may reflect the local imprint of proximal continental input superimposed upon global changes in the ocean reservoir. The time of initiation of large-scale North Hemisphere glaciation at ~2.6 Ma is characterized by a declining pattern of diatom Ge/Si ratios, which could have resulted from a global increase in the input of riverine Si due to enhanced silica weathering and/or equatorward (northward) intrusions of subantarctic waters enriched in silica. High (Ge/Si)opal ratios are associated with high opal contents from the same sediment samples and with warm climate as indicated by depleted benthic foraminiferal d18O values from the North and Equatorial Atlantic. Cold periods signified by enriched benthic d18O values, on the contrary, are associated with lower (Ge/Si)opal ratios. We interpret diatom Ge/Si values to reflect the prevailing weathering state on the continents, with greater chemical weathering during warm and wet periods of the Pliocene and less during cooler and drier intervals. Dataset Antarc* Antarctic South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic ENVELOPE(11.319300,13.027770,-19.619690,-25.513880) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
175-1081A 175-1084A AGE Aluminium Benguela Current South Atlantic Ocean DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Germanium/Silica biogenous opal ratio Joides Resolution Leg175 Ocean Drilling Program ODP Opal biogenic silica Sample code/label |
spellingShingle |
175-1081A 175-1084A AGE Aluminium Benguela Current South Atlantic Ocean DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Germanium/Silica biogenous opal ratio Joides Resolution Leg175 Ocean Drilling Program ODP Opal biogenic silica Sample code/label Lin, Hui-Ling Chen, Chiau-Ju (Appendix 1) Age, Ge/Si ratio, aluminium and opal contents in ODP Sites 175-1081 and 175-1084 |
topic_facet |
175-1081A 175-1084A AGE Aluminium Benguela Current South Atlantic Ocean DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Germanium/Silica biogenous opal ratio Joides Resolution Leg175 Ocean Drilling Program ODP Opal biogenic silica Sample code/label |
description |
As a result of both culture and sediment core studies, the ratio of germanium (Ge) to silicon (Si) in diatom shells has been proposed as a proxy for monitoring whole-ocean changes in seawater Ge/Si, a ratio affected by changes in continental weathering. However, because of the difficulties of extracting and cleaning diatom frustules from deep-sea sediments, only samples from highly pure diatom oozes in the Antarctic region have been previously analyzed. Here we present data on diatom Ge/Si ratios, (Ge/Si)opal, for the time interval between 3.1 and 1.9 Ma from a mid-latitude, coastal upwelling area where significant terrigenous sediment input complicated the sample processing and analyses. In general, our (Ge/Si)opal values show the same decreasing trend after 2.6 Ma than previously measured in Antarctic sediments (Shemesh et al., 1989. Paleoceanography 4, 221-231), but with a noisier background that may reflect the local imprint of proximal continental input superimposed upon global changes in the ocean reservoir. The time of initiation of large-scale North Hemisphere glaciation at ~2.6 Ma is characterized by a declining pattern of diatom Ge/Si ratios, which could have resulted from a global increase in the input of riverine Si due to enhanced silica weathering and/or equatorward (northward) intrusions of subantarctic waters enriched in silica. High (Ge/Si)opal ratios are associated with high opal contents from the same sediment samples and with warm climate as indicated by depleted benthic foraminiferal d18O values from the North and Equatorial Atlantic. Cold periods signified by enriched benthic d18O values, on the contrary, are associated with lower (Ge/Si)opal ratios. We interpret diatom Ge/Si values to reflect the prevailing weathering state on the continents, with greater chemical weathering during warm and wet periods of the Pliocene and less during cooler and drier intervals. |
format |
Dataset |
author |
Lin, Hui-Ling Chen, Chiau-Ju |
author_facet |
Lin, Hui-Ling Chen, Chiau-Ju |
author_sort |
Lin, Hui-Ling |
title |
(Appendix 1) Age, Ge/Si ratio, aluminium and opal contents in ODP Sites 175-1081 and 175-1084 |
title_short |
(Appendix 1) Age, Ge/Si ratio, aluminium and opal contents in ODP Sites 175-1081 and 175-1084 |
title_full |
(Appendix 1) Age, Ge/Si ratio, aluminium and opal contents in ODP Sites 175-1081 and 175-1084 |
title_fullStr |
(Appendix 1) Age, Ge/Si ratio, aluminium and opal contents in ODP Sites 175-1081 and 175-1084 |
title_full_unstemmed |
(Appendix 1) Age, Ge/Si ratio, aluminium and opal contents in ODP Sites 175-1081 and 175-1084 |
title_sort |
(appendix 1) age, ge/si ratio, aluminium and opal contents in odp sites 175-1081 and 175-1084 |
publisher |
PANGAEA |
publishDate |
2002 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.744050 https://doi.org/10.1594/PANGAEA.744050 |
op_coverage |
MEDIAN LATITUDE: -22.566785 * MEDIAN LONGITUDE: 12.173535 * SOUTH-BOUND LATITUDE: -25.513880 * WEST-BOUND LONGITUDE: 11.319300 * NORTH-BOUND LATITUDE: -19.619690 * EAST-BOUND LONGITUDE: 13.027770 * DATE/TIME START: 1997-09-09T02:00:00 * DATE/TIME END: 1997-09-24T03:15:00 * MINIMUM ELEVATION: -1991.9 m * MAXIMUM ELEVATION: -794.1 m |
long_lat |
ENVELOPE(11.319300,13.027770,-19.619690,-25.513880) |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic South Atlantic Ocean |
genre_facet |
Antarc* Antarctic South Atlantic Ocean |
op_relation |
Lin, Hui-Ling; Chen, Chiau-Ju (2002): A late Pliocene daitom Ge/Si record from the Southeast Atlantic. Marine Geology, 180(1-4), 151-161, https://doi.org/10.1016/S0025-3227(01)00211-0 https://doi.pangaea.de/10.1594/PANGAEA.744050 https://doi.org/10.1594/PANGAEA.744050 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.744050 https://doi.org/10.1016/S0025-3227(01)00211-0 |
_version_ |
1766152188219883520 |