Age models of ODP Leg 175 holes
A multiproxy approach including the use of stable isotopes, magnetic characterization analyses, and organic geochemistry has been adopted to consider factors such as productivity and terrigenous input over the past 1.5 m.y. at two areas off the western coast of Africa. These factors can, in turn, be...
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2001
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.740074 2024-05-19T07:48:34+00:00 Age models of ODP Leg 175 holes Durham, Emma L Maslin, Mark Platzman, E Rosell-Melé, Antoni Marlow, J R Leng, M Lowry, David Burns, Stephen J ODP Leg 175 Shipboard Scientific Party MEDIAN LATITUDE: -10.911396 * MEDIAN LONGITUDE: 11.055644 * SOUTH-BOUND LATITUDE: -19.619690 * WEST-BOUND LONGITUDE: 10.436580 * NORTH-BOUND LATITUDE: -5.068830 * EAST-BOUND LONGITUDE: 11.319300 * DATE/TIME START: 1997-08-26T23:38:00 * DATE/TIME END: 1997-09-11T21:15:00 2001 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.740074 https://doi.org/10.1594/PANGAEA.740074 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.740074 https://doi.org/10.1594/PANGAEA.740074 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Durham, Emma L; Maslin, Mark; Platzman, E; Rosell-Melé, Antoni; Marlow, J R; Leng, M; Lowry, David; Burns, Stephen J; ODP Leg 175 Shipboard Scientific Party (2001): Reconstructing the climatic history of the Western Coast of Africa over the Past 1.5 m.y.: A comparison of proxy records from the Congo Basin and the Walvis Ridge and the search for evidence of the Mid-Pleistocene revolution. In: Wefer, G; Berger, WH; Richter, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 175, 1-46, https://doi.org/10.2973/odp.proc.sr.175.229.2001 175-1076A 175-1077A 175-1081A Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP Dataset 2001 ftpangaea https://doi.org/10.1594/PANGAEA.74007410.2973/odp.proc.sr.175.229.2001 2024-04-30T23:34:34Z A multiproxy approach including the use of stable isotopes, magnetic characterization analyses, and organic geochemistry has been adopted to consider factors such as productivity and terrigenous input over the past 1.5 m.y. at two areas off the western coast of Africa. These factors can, in turn, be used to consider variability in ocean circulation and upwelling in addition to changes in climate on the African continent. In particular, studies focused on the influence of glacial-interglacial cycles and evidence for the mid-Pleistocene revolution (MPR), a complex change in climate that occurred at ~1 Ma. A comparison of the records from the two areas drilled during Ocean Drilling Program Leg 175, the Congo Basin, at a latitude of 5°S (Holes 1076A and 1077A), and the Walvis Ridge, at 17°S (Hole 1081A), demonstrates that these sites are affected by different localized factors. The sites in the Congo Basin are strongly influenced by freshwater and sediment from the Congo River, whereas the site at the Walvis Ridge is located in the center of oceanic upwelling and contains a more marine signal. Evidence also suggests that the two sites responded differently to both long- and short-term climatic variations. In particular, the response at the Walvis Ridge to the MPR occurred over an extended period, from 1.1 to 0.8 Ma, and was associated with a change in the dominant source of terrigenous input to the site in conjunction with a change in the productivity signal. In the Congo Basin, the response to the MPR was more rapid, occurring between 0.9 and 0.8 Ma. During this period, the influence of the Congo River became significant. However, productivity records only began to respond toward the end of this interval, at 0.8 Ma. Dataset South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(10.436580,11.319300,-5.068830,-19.619690) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
175-1076A 175-1077A 175-1081A Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP |
spellingShingle |
175-1076A 175-1077A 175-1081A Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP Durham, Emma L Maslin, Mark Platzman, E Rosell-Melé, Antoni Marlow, J R Leng, M Lowry, David Burns, Stephen J ODP Leg 175 Shipboard Scientific Party Age models of ODP Leg 175 holes |
topic_facet |
175-1076A 175-1077A 175-1081A Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP |
description |
A multiproxy approach including the use of stable isotopes, magnetic characterization analyses, and organic geochemistry has been adopted to consider factors such as productivity and terrigenous input over the past 1.5 m.y. at two areas off the western coast of Africa. These factors can, in turn, be used to consider variability in ocean circulation and upwelling in addition to changes in climate on the African continent. In particular, studies focused on the influence of glacial-interglacial cycles and evidence for the mid-Pleistocene revolution (MPR), a complex change in climate that occurred at ~1 Ma. A comparison of the records from the two areas drilled during Ocean Drilling Program Leg 175, the Congo Basin, at a latitude of 5°S (Holes 1076A and 1077A), and the Walvis Ridge, at 17°S (Hole 1081A), demonstrates that these sites are affected by different localized factors. The sites in the Congo Basin are strongly influenced by freshwater and sediment from the Congo River, whereas the site at the Walvis Ridge is located in the center of oceanic upwelling and contains a more marine signal. Evidence also suggests that the two sites responded differently to both long- and short-term climatic variations. In particular, the response at the Walvis Ridge to the MPR occurred over an extended period, from 1.1 to 0.8 Ma, and was associated with a change in the dominant source of terrigenous input to the site in conjunction with a change in the productivity signal. In the Congo Basin, the response to the MPR was more rapid, occurring between 0.9 and 0.8 Ma. During this period, the influence of the Congo River became significant. However, productivity records only began to respond toward the end of this interval, at 0.8 Ma. |
format |
Dataset |
author |
Durham, Emma L Maslin, Mark Platzman, E Rosell-Melé, Antoni Marlow, J R Leng, M Lowry, David Burns, Stephen J ODP Leg 175 Shipboard Scientific Party |
author_facet |
Durham, Emma L Maslin, Mark Platzman, E Rosell-Melé, Antoni Marlow, J R Leng, M Lowry, David Burns, Stephen J ODP Leg 175 Shipboard Scientific Party |
author_sort |
Durham, Emma L |
title |
Age models of ODP Leg 175 holes |
title_short |
Age models of ODP Leg 175 holes |
title_full |
Age models of ODP Leg 175 holes |
title_fullStr |
Age models of ODP Leg 175 holes |
title_full_unstemmed |
Age models of ODP Leg 175 holes |
title_sort |
age models of odp leg 175 holes |
publisher |
PANGAEA |
publishDate |
2001 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.740074 https://doi.org/10.1594/PANGAEA.740074 |
op_coverage |
MEDIAN LATITUDE: -10.911396 * MEDIAN LONGITUDE: 11.055644 * SOUTH-BOUND LATITUDE: -19.619690 * WEST-BOUND LONGITUDE: 10.436580 * NORTH-BOUND LATITUDE: -5.068830 * EAST-BOUND LONGITUDE: 11.319300 * DATE/TIME START: 1997-08-26T23:38:00 * DATE/TIME END: 1997-09-11T21:15:00 |
long_lat |
ENVELOPE(10.436580,11.319300,-5.068830,-19.619690) |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Supplement to: Durham, Emma L; Maslin, Mark; Platzman, E; Rosell-Melé, Antoni; Marlow, J R; Leng, M; Lowry, David; Burns, Stephen J; ODP Leg 175 Shipboard Scientific Party (2001): Reconstructing the climatic history of the Western Coast of Africa over the Past 1.5 m.y.: A comparison of proxy records from the Congo Basin and the Walvis Ridge and the search for evidence of the Mid-Pleistocene revolution. In: Wefer, G; Berger, WH; Richter, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 175, 1-46, https://doi.org/10.2973/odp.proc.sr.175.229.2001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.740074 https://doi.org/10.1594/PANGAEA.740074 |
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.74007410.2973/odp.proc.sr.175.229.2001 |
_version_ |
1799466868730232832 |