%0 Journal Article
%T Mineral content and geochemistry characteristics of carbonate rock in well No. Xichen-1 and geological significance<br>西琛1井碳酸盐岩的矿物成分、地化特征及地质意义
%A WEI Xi
%A JIA ChengZao
%A MENG WeiGong
%A ZHANG FangLi
%A <br>魏喜
%A 贾承造
%A 孟卫工
%A 张方礼
%J 岩石学报
%D 2007
%I 
%X Cenozoic carbonate rocks in Xisha islands are the products of the South China Sea formation and evolution,as a result, their mineral component,chemistry composition,the contents of total Sr,and the ~(87)Sr/~(86)Sr preferably reflect marine paleoenvironment in which the rock formed.As the deepest cored well,Xichen 1 opens out 3 layers of dolostone and 4 layers of limestone.The dolostone terrane bears high MgO content,low total Sr content,and contains some facies minerals,such as rock salt,hematite and dialogite, which represent a high palaeosalinity and oxygenation environment,corresponding with 3 glacial events.The limestone terrane boars low MgO content,high total Sr content,and also contains some facies minerals,such as siderite and pyrite,which represent a low palaeosalinity and reducing environment,corresponding with 4 interglacial events.As a whole,the contents of total Sr,and the ~(87)Sr/~(86)Sr in late Cenozoic carbonate rock increase by degrees from bottom to top,which were controlled by Qinghai-Tibot uplift tectonic setting aroused by collision between Eurasian and Indian plates.While the contents of total Sr and the ~(87)Sr/~(86)Sr in late Cenozoic carbonate rock still present an obviously subsection characteristics.In middle-upper Miocene dolostone,the total Sr content is low,but the ~(87)Sr/~(86)Sr shows an evidently increasing trend,which are related with strong dolomitization and regression caused by the biggest glacier event;In upper-upper Pliocene to Holocene limestone,the total Sr content is high and the ~(87)Sr/~(86)Sr shows an evidently decreasing trend with a large variety range,which are controlled by both dolomitization and violent mantle magma eruption.
%K Marine paleoenvironment
%K Mineral and geochemical composition of reef carbonates
%K Xisha Islands
%K Late Cenozoic<br>古海洋环境
%K 碳酸盐岩矿物和地球化学成分
%K 西沙群岛西琛1井
%K 晚新生代
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=494BDEAB8883B3F3E9A9F7E68EA08C89&yid=A732AF04DDA03BB3&vid=EA389574707BDED3&iid=708DD6B15D2464E8&sid=05F456AEC361A0E3&eid=EB8F3463B7B9C299&journal_id=1000-0569&journal_name=岩石学报&referenced_num=1&reference_num=88