globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.02.015
论文题名:
Late Miocene to early Pliocene climate variability off NW Africa (ODP Site 659)
作者: Colin C.; Siani G.; Liu Z.; Blamart D.; Skonieczny C.; Zhao Y.; Bory A.; Frank N.; Duchamp-Alphonse S.; Thil F.; Richter T.; Kissel C.; Gargani J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 401
起始页码: 81
结束页码: 95
语种: 英语
英文关键词: African monsoon ; Cape Verde plateau ; Dust input ; ITCZ ; Messinian Salinity Crisis
英文摘要: A high resolution δ18O record obtained on benthic foraminifera (Cibicides wuellerstorfi) combined with clay mineralogy, major element concentrations and Sr-Nd isotopes have been investigated for the ODP Site 659 located off North Africa in order to reconstruct African monsoon intensity between 6.2 and 4.9Myr. Mineralogical and geochemical results indicate that sedimentation on the Cape Verde plateau results from a mixture of sediments deriving from the neighbouring Saharan arid region and the wet African equatorial zone (Sahelian Band), characterised by a low and a high state of weathering, respectively. Past variations in terrigenous inputs from these areas allow us to track past extension and displacement of the West African Monsoon-ITCZ system. Maximal summer insolation induced a northward migration of the inter-tropical convergence zone (ITCZ), wetter conditions in the Sahel, and a diminishing of wind erosion over the South Sahara and Sahel. In addition, there was an increase in river input to the Cape Verde plateau of sediments derived from southern sedimentary sources, which are characterised by high kaolinite contents and CIA values and low K/Al and Ti/Al ratios. On the other hand, minimal summer insolation induced a southward movement of the ITCZ, drier climate in the Sahel and stronger easterly winds resulting in an increase in dust transport from the Sahara to the Cape Verde Plateau. Dust particles are characterised by high illite and smectite content and by a low chemical state of weathering (low CIA values and high K/Al and Ti/Al ratios). Finally, our results provide new clues regarding the re-flooding of the Mediterranean Sea at the end of the MSC (5.33Myr). This event was associated with enhanced aridity in the Sahara, implying a reorganisation of the atmospheric circulation and a southward migration of the ITCZ. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69384
Appears in Collections:过去全球变化的重建

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作者单位: IDES - Laboratoire des Interactions et Dynamique des Environnements de Surface (UMR 8148), Département des Sciences de la Terre Université Paris-Sud XI, 91405 Orsay, France; State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China; LSCE - Laboratoire des Sciences du Climat et de l'Environnement (UMR 1572 CEA-CNRS-UVSQ), Domaine du CNRS, Avenue de la Terrasse, F-91118 Gif sur Yvette, France; GEOSYSTEMES (FRE CNRS 3298), Université de Lille I, 59655 Villeneuve d'Ascq, France; Institut für Umweltphysik, Physik der Umweltarchive, Universität Heidelbergnsérer numérotationligne, Im Neuenheimerfeld 229, 69120 Heidelberg, Germany; Royal Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Den Burg, Netherlands

Recommended Citation:
Colin C.,Siani G.,Liu Z.,et al. Late Miocene to early Pliocene climate variability off NW Africa (ODP Site 659)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,401
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