Geochemistry of ODP Site 202-1233 and river sediments
Bulk sediment chemistry from three Chilean continental margin Ocean Drilling Program sites constrains regional continental erosion over the past 30,000 years. Sediments from thirteen rivers that drain the (mostly igneous) Andes and the (mostly metamorphic) Coast Range, along with existing rock chemi...
Main Authors: | , , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2010
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.816355 https://doi.org/10.1594/PANGAEA.816355 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.816355 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.816355 2023-05-15T13:42:11+02:00 Geochemistry of ODP Site 202-1233 and river sediments Muratli, Jesse M Chase, Zanna McManus, James Mix, Alan C MEDIAN LATITUDE: -38.791101 * MEDIAN LONGITUDE: -73.405680 * SOUTH-BOUND LATITUDE: -41.000080 * WEST-BOUND LONGITUDE: -74.449860 * NORTH-BOUND LATITUDE: -36.426180 * EAST-BOUND LONGITUDE: -72.094750 * DATE/TIME START: 2002-04-12T00:00:00 * DATE/TIME END: 2002-04-12T00:00:00 2010-07-04 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.816355 https://doi.org/10.1594/PANGAEA.816355 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.816355 https://doi.org/10.1594/PANGAEA.816355 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Muratli, Jesse M; Chase, Zanna; McManus, James; Mix, Alan C (2010): Ice-sheet control of continental erosion in central and southern Chile (36°-41°S) over the last 30,000 years. Quaternary Science Reviews, 29(23-24), 3230-3239, https://doi.org/10.1016/j.quascirev.2010.06.037 Ocean Drilling Program ODP Dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.816355 https://doi.org/10.1016/j.quascirev.2010.06.037 2023-01-20T07:33:03Z Bulk sediment chemistry from three Chilean continental margin Ocean Drilling Program sites constrains regional continental erosion over the past 30,000 years. Sediments from thirteen rivers that drain the (mostly igneous) Andes and the (mostly metamorphic) Coast Range, along with existing rock chemistry datasets, define terrestrial provenance for the continental margin sediments. Andean river sediments have high Mg/Al relative to Coast-Range river sediments. Near 36°S, marine sediments have high-Mg/Al (i.e. more Andean) sources during the last glacial period, and lower-Mg/Al (less Andean) sources during the Holocene. Near 41°S a Ti-rich source, likely from coast-range igneous intrusions, is prevalent during Holocene time, whereas high-Mg/Al Andean sources are more prevalent during the last glacial period. We infer that there is a dominant ice-sheet control of sediment sources. At 36°S, Andean-sourced sediment decreased as Andean mountain glaciers retreated after ~17.6 ka, coincident with local oceanic warming and southward retreat of the Patagonian Forest and, by inference, westerly winds. At 41°S Andean sediment dominance peaks and then rapidly declines at ~19 ka, coincident with local oceanic warming and the earliest deglacial sea-level rise. We hypothesize that this decreased flux of Andean material in the south is related to rapid retreat of the marine-based portion of the Patagonian Ice Sheet in response to global sea-level rise, as the resulting flooding of the southern portion of the Central Valley created a sink for Andean sediments in this region. Reversal of the decreasing deglacial Mg/Al trend at 41°S from 14.5 to 13.0 ka is consistent with a brief re-advance of the Patagonian ice sheet coincident with the Antarctic Cold Reversal. Dataset Antarc* Antarctic Ice Sheet PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic ENVELOPE(-74.449860,-72.094750,-36.426180,-41.000080) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Ocean Drilling Program ODP |
spellingShingle |
Ocean Drilling Program ODP Muratli, Jesse M Chase, Zanna McManus, James Mix, Alan C Geochemistry of ODP Site 202-1233 and river sediments |
topic_facet |
Ocean Drilling Program ODP |
description |
Bulk sediment chemistry from three Chilean continental margin Ocean Drilling Program sites constrains regional continental erosion over the past 30,000 years. Sediments from thirteen rivers that drain the (mostly igneous) Andes and the (mostly metamorphic) Coast Range, along with existing rock chemistry datasets, define terrestrial provenance for the continental margin sediments. Andean river sediments have high Mg/Al relative to Coast-Range river sediments. Near 36°S, marine sediments have high-Mg/Al (i.e. more Andean) sources during the last glacial period, and lower-Mg/Al (less Andean) sources during the Holocene. Near 41°S a Ti-rich source, likely from coast-range igneous intrusions, is prevalent during Holocene time, whereas high-Mg/Al Andean sources are more prevalent during the last glacial period. We infer that there is a dominant ice-sheet control of sediment sources. At 36°S, Andean-sourced sediment decreased as Andean mountain glaciers retreated after ~17.6 ka, coincident with local oceanic warming and southward retreat of the Patagonian Forest and, by inference, westerly winds. At 41°S Andean sediment dominance peaks and then rapidly declines at ~19 ka, coincident with local oceanic warming and the earliest deglacial sea-level rise. We hypothesize that this decreased flux of Andean material in the south is related to rapid retreat of the marine-based portion of the Patagonian Ice Sheet in response to global sea-level rise, as the resulting flooding of the southern portion of the Central Valley created a sink for Andean sediments in this region. Reversal of the decreasing deglacial Mg/Al trend at 41°S from 14.5 to 13.0 ka is consistent with a brief re-advance of the Patagonian ice sheet coincident with the Antarctic Cold Reversal. |
format |
Dataset |
author |
Muratli, Jesse M Chase, Zanna McManus, James Mix, Alan C |
author_facet |
Muratli, Jesse M Chase, Zanna McManus, James Mix, Alan C |
author_sort |
Muratli, Jesse M |
title |
Geochemistry of ODP Site 202-1233 and river sediments |
title_short |
Geochemistry of ODP Site 202-1233 and river sediments |
title_full |
Geochemistry of ODP Site 202-1233 and river sediments |
title_fullStr |
Geochemistry of ODP Site 202-1233 and river sediments |
title_full_unstemmed |
Geochemistry of ODP Site 202-1233 and river sediments |
title_sort |
geochemistry of odp site 202-1233 and river sediments |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.816355 https://doi.org/10.1594/PANGAEA.816355 |
op_coverage |
MEDIAN LATITUDE: -38.791101 * MEDIAN LONGITUDE: -73.405680 * SOUTH-BOUND LATITUDE: -41.000080 * WEST-BOUND LONGITUDE: -74.449860 * NORTH-BOUND LATITUDE: -36.426180 * EAST-BOUND LONGITUDE: -72.094750 * DATE/TIME START: 2002-04-12T00:00:00 * DATE/TIME END: 2002-04-12T00:00:00 |
long_lat |
ENVELOPE(-74.449860,-72.094750,-36.426180,-41.000080) |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Supplement to: Muratli, Jesse M; Chase, Zanna; McManus, James; Mix, Alan C (2010): Ice-sheet control of continental erosion in central and southern Chile (36°-41°S) over the last 30,000 years. Quaternary Science Reviews, 29(23-24), 3230-3239, https://doi.org/10.1016/j.quascirev.2010.06.037 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.816355 https://doi.org/10.1594/PANGAEA.816355 |
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.816355 https://doi.org/10.1016/j.quascirev.2010.06.037 |
_version_ |
1766164505876758528 |