Grain size analysis and sedimentation rates of ODP Hole 175-1085A off the Namibian coast
Sediments from the ODP Site 1085A were studied to investigate the impacts of global cooling in the Middle and Late Miocene on the climate in Southwestern Africa. The size composition of the sediment was analysed emphasising the silt fraction. A comparison with the modern grain size distribution and...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.738695 2024-09-15T17:41:11+00:00 Grain size analysis and sedimentation rates of ODP Hole 175-1085A off the Namibian coast Roters, Bastian Henrich, Rüdiger LATITUDE: -29.374410 * LONGITUDE: 13.990110 * DATE/TIME START: 1997-09-26T00:15:00 * DATE/TIME END: 1997-09-29T18:15:00 2010 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.738695 https://doi.org/10.1594/PANGAEA.738695 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.738695 https://doi.org/10.1594/PANGAEA.738695 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Roters, Bastian; Henrich, Rüdiger (2010): The middle to late Miocene climatic development of Southwest Africa derived from the sedimentological record of ODP Site 1085A. International Journal of Earth Sciences, 99(2), 459-471, https://doi.org/10.1007/s00531-008-0398-9 175-1085A Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP dataset publication series 2010 ftpangaea https://doi.org/10.1594/PANGAEA.73869510.1007/s00531-008-0398-9 2024-07-24T02:31:20Z Sediments from the ODP Site 1085A were studied to investigate the impacts of global cooling in the Middle and Late Miocene on the climate in Southwestern Africa. The size composition of the sediment was analysed emphasising the silt fraction. A comparison with the modern grain size distribution and suitable transport processes made it possible to assign specific transport processes to the grain size composition. Three processes are considered for transport of terrigeneous silt: while there was no evidence found for (1) transport by ocean currents, the analyses showed signals of (2) wind transport indicating dry conditions associated with a cool climate and (3) fluvial transport that points to humid and warm conditions. Three climatic phases were defined. The first phase from 13.8 to 11.8 Myr reveals a stable humid climate in Southwest Africa independent of the Antarctic glaciations. During the second phase from 11.8 to 10.4 Myr the regional climate cooled considerably but was not drier. Additionally, the climate during this phase reacted to the Antarctic glaciations. This cooling-trend continued during phase 3 from 10.4 to 9.0 Myr with a significant increase in dust input, pointing to overall drier conditions. However, fluvial transport still remained as the main source. Other/Unknown Material Antarc* Antarctic South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(13.990110,13.990110,-29.374410,-29.374410) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
175-1085A Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP |
spellingShingle |
175-1085A Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP Roters, Bastian Henrich, Rüdiger Grain size analysis and sedimentation rates of ODP Hole 175-1085A off the Namibian coast |
topic_facet |
175-1085A Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP |
description |
Sediments from the ODP Site 1085A were studied to investigate the impacts of global cooling in the Middle and Late Miocene on the climate in Southwestern Africa. The size composition of the sediment was analysed emphasising the silt fraction. A comparison with the modern grain size distribution and suitable transport processes made it possible to assign specific transport processes to the grain size composition. Three processes are considered for transport of terrigeneous silt: while there was no evidence found for (1) transport by ocean currents, the analyses showed signals of (2) wind transport indicating dry conditions associated with a cool climate and (3) fluvial transport that points to humid and warm conditions. Three climatic phases were defined. The first phase from 13.8 to 11.8 Myr reveals a stable humid climate in Southwest Africa independent of the Antarctic glaciations. During the second phase from 11.8 to 10.4 Myr the regional climate cooled considerably but was not drier. Additionally, the climate during this phase reacted to the Antarctic glaciations. This cooling-trend continued during phase 3 from 10.4 to 9.0 Myr with a significant increase in dust input, pointing to overall drier conditions. However, fluvial transport still remained as the main source. |
format |
Other/Unknown Material |
author |
Roters, Bastian Henrich, Rüdiger |
author_facet |
Roters, Bastian Henrich, Rüdiger |
author_sort |
Roters, Bastian |
title |
Grain size analysis and sedimentation rates of ODP Hole 175-1085A off the Namibian coast |
title_short |
Grain size analysis and sedimentation rates of ODP Hole 175-1085A off the Namibian coast |
title_full |
Grain size analysis and sedimentation rates of ODP Hole 175-1085A off the Namibian coast |
title_fullStr |
Grain size analysis and sedimentation rates of ODP Hole 175-1085A off the Namibian coast |
title_full_unstemmed |
Grain size analysis and sedimentation rates of ODP Hole 175-1085A off the Namibian coast |
title_sort |
grain size analysis and sedimentation rates of odp hole 175-1085a off the namibian coast |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.738695 https://doi.org/10.1594/PANGAEA.738695 |
op_coverage |
LATITUDE: -29.374410 * LONGITUDE: 13.990110 * DATE/TIME START: 1997-09-26T00:15:00 * DATE/TIME END: 1997-09-29T18:15:00 |
long_lat |
ENVELOPE(13.990110,13.990110,-29.374410,-29.374410) |
genre |
Antarc* Antarctic South Atlantic Ocean |
genre_facet |
Antarc* Antarctic South Atlantic Ocean |
op_source |
Supplement to: Roters, Bastian; Henrich, Rüdiger (2010): The middle to late Miocene climatic development of Southwest Africa derived from the sedimentological record of ODP Site 1085A. International Journal of Earth Sciences, 99(2), 459-471, https://doi.org/10.1007/s00531-008-0398-9 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.738695 https://doi.org/10.1594/PANGAEA.738695 |
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.73869510.1007/s00531-008-0398-9 |
_version_ |
1810487328730251264 |