The site of Longgupo in his geological and geomorphological environment

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	The site of Longgupo in his geological and geomorphological environment
	Rasse, Michel 1,2; Huang, Wanpo 3,4; Boeda, Eric 1,3,4
刊名	ANTHROPOLOGIE
	2011
卷号	115 期号:1 页码:23-39
关键词	Plio-pleistocene Longgupo Site China Geological Environment Geomorphological Environment
文献子类	Article
英文摘要	On a regional scale, Longgupo is found within a karstic landscape of fenglin-ouvala developed in the Triassic limestones of the Yangtze platform. After several seasons, it is now possible to define and propose a scenario for the formation of the site. During one of the intense karstification phases during the Cretaceous or early Tertiary, karstic conduits were created deep in the substratum. In concert with these deep flows and by karstic collapse, a cave was created. With the start of Himalayan uplift during the Oligocene and Miocene, the beginning of fluvial cutting was reflected by the partial erosion of the upper sandstone formations and the creation of the Miaoyu Valley. This action opened the cave, which would later be occupied by the hominid groups that interest us here. Probably at the end of the Tertiary, the cave, open at the bottom of the valley slope and facing upstream, began to be filled with alluvial deposits from the valley. The basal deposits (C III 10 of the current stratigraphic sequence, levels 20-13 of the first sequence) begin with black clays; at the Plio-Pleistocene transition, deposits become clearly alluvial, increasingly marked by reworking of surface and karstic clays and by systematically coarser contributions. During the deposition period of archaeological complexes III/III' (previously levels 12-6), karstic collapse appears to have still been active. During the Lower Pleistocene sensu lato, the coarse nature of the deposits becomes accentuated. The material of complex II (previously levels 5-2) is a deposit that is clearly heterometric and coarse, composed at the end mainly of gravels, pebbles and more or less rounded blocks in a clayey matrix. At the conclusion of this new stage, the cave was entirely filled and, purely and simply, disappeared from the landscape. As the valley deepened during the Middle and Upper Pleistocene, the Longgupo slope underwent profound changes, the last of the limestone blocks disappeared from the slope limit and the archaeological site was protected by the coarse breccias that carpeted the slope. The main cause for the sedimentation processes at the site of Longgupo is the hydrosystem of the Miaoyu he, although injections of karstic type sensu stricto cannot be excluded. All of the arguments effectively support alluvial deposition: pebbles, an alternation of coarse and clayey beds, systematic and repeated granulometric decrease. But the stratigraphic disposition was disturbed by deformations due to gravity and karstic origins; the alluvial sediments, rendered plastic by the high proportion of clayey beds, were deformed by gravity (deformation of beds, faults, slopes) following the direction of the slope and by karstic collapse along the two limestone walls north and south of the sites (in sub-parallel faults to the south and by circular aspiration to the north). To this is added a calcitic consolidation of the upper levels that made it difficult to excavate complex C II. The stratigraphic disposition of the archaeological levels at Longgupo is now well understood. It has thus been possible to collect samples for absolute dating, to be published soon. (C) 2011 Published by Elsevier Masson SAS.
WOS研究方向	Anthropology
语种	英语
WOS记录号	WOS:000288824200003
内容类型	期刊论文
源URL	[http://124.16.247.212/handle/311034/7656]
专题	古脊椎动物与古人类研究所_图书馆1
作者单位	1.Univ Paris Ouest Nanterre La Def, UMR CNRS ArSCAN 7041, Equipe AnTET, F-92023 Nanterre, France 2.Univ Rouen, UMR CNRS IDEES 6228, Lab GEOSUDS, Dept Geog, F-76821 Mont St Aignan, France 3.China Three Gorges Museum, Chongqing Three Gorges Inst Paleoanthropol, Chongqing 400015, Peoples R China 4.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Rasse, Michel,Huang, Wanpo,Boeda, Eric. The site of Longgupo in his geological and geomorphological environment[J]. ANTHROPOLOGIE,2011,115(1):23-39.
APA	Rasse, Michel,Huang, Wanpo,&Boeda, Eric.(2011).The site of Longgupo in his geological and geomorphological environment.ANTHROPOLOGIE,115(1),23-39.
MLA	Rasse, Michel,et al."The site of Longgupo in his geological and geomorphological environment".ANTHROPOLOGIE 115.1(2011):23-39.