气候变化领域集成服务门户(CCPortal): Multi-tracer study of continental erosion and sediment transport to the Red Sea and the Gulf of Aden during the last 20 ka

CCPortal

DOI	10.1016/j.quascirev.2019.02.033
	Multi-tracer study of continental erosion and sediment transport to the Red Sea and the Gulf of Aden during the last 20 ka
	Rojas V.P.; Meynadier L.; Colin C.; Bassinot F.; Valet J.-P.; Miska S.
发表日期	2019
ISSN	0277-3791
起始页码	135
结束页码	148
卷号	212
英文摘要	Mineralogical compositions and grain-size distributions combined with 87Sr/86Sr and εNd values of the detrital fraction were studied on cores recovered from the Gulf of Aden (MD92-1002) and the Red Sea (MD92-1008) basins in order to document past changes in Indian monsoon and northwesterly winds during the last glacial-interglacial transition (the last 20 ka), encompassing the African Humid Period (AHP). The εNd vs. 87Sr/86Sr plot indicates that sediments result from the mixing of two main sedimentary sources corresponding to the Afar volcanic rocks in Ethiopia and to the Arabian-Nubian Shield. Variations of sediment isotopic and mineralogical composition point to a diminution of the volcanic source contribution during the last deglaciation. Changes of mineral-accumulation rates and grain-size distributions denote a decline in the aridity of the source regions during the Holocene, particularly of the Afar volcanic region. In this area, the reduction of detrital supply, from 15 cal ka BP, can be explained by an increase of precipitations during the AHP, which resulted in an expansion of the vegetation cover and lake extensions in East Africa. In the Arabian Peninsula, precipitations were confined to the south, allowing sediments to be transported even during the Holocene. Our data suggest that the southwest monsoon was not the main carrier of aeolian sediments to the Red Sea and Gulf of Aden basins, but the Northwesterlies. In the Red Sea, the isotopic and mineralogical tracers reveal a contribution from Saharan dust between 16 and 12 cal ka BP, transported from the Nile catchment after aridification during Heinrich event 1. © 2019 Elsevier Ltd
英文关键词	African humid period; Clay mineralogy; Gulf of Aden; Last glacial period; Radiogenic isotopes; Red Sea; Siliciclastic grain-size
语种	英语
scopus关键词	Atmospheric thermodynamics; Catchments; Glacial geology; Grain size and shape; Hierarchical systems; Isotopes; Minerals; Sediment transport; Sedimentary rocks; Size distribution; Volcanic rocks; Volcanoes; Clay mineralogy; Grain size; Gulf of Aden; Humid periods; Last glacial period; Radiogenic isotopes; Red sea; Underwater mineralogy; clay mineral; erosion; grain size; Heinrich event; Holocene; Last Glacial; Last Glacial-Interglacial; mineralogy; monsoon; neodymium isotope; radionuclide; sediment transport; siliciclastic deposit; size distribution; strontium isotope; tracer; volcanic rock; westerly; Arabian Peninsula; Arabian Sea; Arabian Shield; East Africa; Ethiopia; Gulf of Aden; Indian Ocean; Nubian Shield; Red Sea [Indian Ocean]
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151945
作者单位	Institut de Physique du Globe de Paris, Université Paris Diderot, Sorbonne Paris-Cité, UMR 7154 CNRS, 1 rue Jussieu, Paris Cedex 05, FR-75238, France; Laboratoire Géosciences Paris-Sud (GEOPS), UMR 8148, CNRS-Université de Paris-Sud, Université Paris-Saclay, Bâtiment 504, Orsay Cedex, 91405, France; Laboratoire des Sciences du Climat et de l'Environnement (CEA/CNRS/UVSQ), Domaine du CNRS, Bât. 12, avenue de la Terrasse, Gif-sur-Yvette Cedex, F-91198, France
推荐引用方式 GB/T 7714	Rojas V.P.,Meynadier L.,Colin C.,et al. Multi-tracer study of continental erosion and sediment transport to the Red Sea and the Gulf of Aden during the last 20 ka[J],2019,212.
APA	Rojas V.P.,Meynadier L.,Colin C.,Bassinot F.,Valet J.-P.,&Miska S..(2019).Multi-tracer study of continental erosion and sediment transport to the Red Sea and the Gulf of Aden during the last 20 ka.Quaternary Science Reviews,212.
MLA	Rojas V.P.,et al."Multi-tracer study of continental erosion and sediment transport to the Red Sea and the Gulf of Aden during the last 20 ka".Quaternary Science Reviews 212(2019).