Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.palaeo.2014.02.015 |
Late Miocene to early Pliocene climate variability off NW Africa (ODP Site 659) | |
Colin, Christophe1; Siani, Giuseppe1; Liu, Zhifei2; Blamart, Dominique3; Skonieczny, Charlotte4; Zhao, Yulong2; Bory, Aloys4; Frank, Norbert5; Duchamp-Alphonse, Stephanie; Thil, Francois3; Richter, Thomas6; Kissel, Catherine3; Gargani, Julien1 | |
通讯作者 | Colin, Christophe |
来源期刊 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
![]() |
ISSN | 0031-0182 |
EISSN | 1872-616X |
出版年 | 2014 |
卷号 | 401页码:81-95 |
英文摘要 | A high resolution delta O-18 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 4.9 Myr. 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/AI 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/AI and Ti/AI ratios). Finally, our results provide new clues regarding the re-flooding of the Mediterranean Sea at the end of the MSC (5.33 Myr). This event was associated with enhanced aridity in the Sahara, implying a reorganisation of the atmospheric circulation and a southward migration of the ITCZ. (c) 2014 Elsevier B.V. All rights reserved. |
英文关键词 | African monsoon ITCZ Dust input Messinian Salinity Crisis Cape Verde plateau |
类型 | Article |
语种 | 英语 |
国家 | France ; Peoples R China ; Germany ; Netherlands |
收录类别 | SCI-E |
WOS记录号 | WOS:000335282800005 |
WOS关键词 | MESSINIAN SALINITY CRISIS ; SAHARAN DUST ; DEEP-SEA ; GEOCHEMICAL INVESTIGATIONS ; MINERAL DUST ; ISOTOPE STRATIGRAPHY ; NORTHEASTERN AFRICA ; EROSIONAL HISTORY ; ATLANTIC-OCEAN ; SEDIMENTS |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology |
WOS研究方向 | Physical Geography ; Geology ; Paleontology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/184093 |
作者单位 | 1.Univ Paris 11, Dept Sci Terre, IDES Lab Interact & Dynam Environm Surface, UMR 8148, F-91405 Orsay, France; 2.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China; 3.Domaine CNRS, CEA CNRS UVSQ, LSCE Lab Sci Climat & Environm, UMR 1572, F-91118 Gif Sur Yvette, France; 4.Univ Lille 1, GEOSYST FRE CNRS 3298, F-59655 Villeneuve, France; 5.Univ Heidelbergnserer Numerotationligne, Inst Umweltphys, D-69120 Heidelberg, Germany; 6.Royal Netherlands Inst Sea Res, NL-1790 AB Den Burg, Netherlands |
推荐引用方式 GB/T 7714 | Colin, Christophe,Siani, Giuseppe,Liu, Zhifei,et al. Late Miocene to early Pliocene climate variability off NW Africa (ODP Site 659)[J],2014,401:81-95. |
APA | Colin, Christophe.,Siani, Giuseppe.,Liu, Zhifei.,Blamart, Dominique.,Skonieczny, Charlotte.,...&Gargani, Julien.(2014).Late Miocene to early Pliocene climate variability off NW Africa (ODP Site 659).PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,401,81-95. |
MLA | Colin, Christophe,et al."Late Miocene to early Pliocene climate variability off NW Africa (ODP Site 659)".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 401(2014):81-95. |
条目包含的文件 | 下载所有文件 | |||||
文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
Late Miocene to earl(2157KB) | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 下载 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。