%0 Journal Article
%T The osmium isotopic compositions and model age of mantle peridotite xenoliths from Jiangsu-Anhui area and their geological significance.<br>苏皖地区幔源橄榄岩捕瞄虏体的锇同位素组成、模式年龄及其意义
%A ZHI XiaChen
%A PENG ZiCheng
%A CHEN DaoGong
%A SUN WeiDong
%A YU ChunJiang
%A <br>支霞臣
%A 彭子成
%A 陈道公　孙卫东
%A 余春江
%J 岩石学报
%D 2001
%I 
%X Cenozoic alkaline basalt contains abundant mantle peridotite xenoliths along the boundary between Jiangsu and Anhui provinces. This paper reports the osmium isotopic compositions of whole rock for the peridotite xenoliths, 187Os/188Os =0.119～0.129, which is mainly characterized as depletion. There is a significant linear correlation between the osmium isotopic compositions and the major element compositions among the samples. The osmium initial ratio (187Os/188Os)0 = 0.109 comes from alumichron, then the relevant model age t=2.5(±0.1)Ga is found from the evolution model of osmium isotopic composition in the convective mantle. The Re depletion age t=1.2Ga, is calculated from the lowest osmium isotopic ratio in the sample set. The longevity of sub-continental lithospheric mantle from osmium isotope systematics in peridotite xenoliths from Jiangsu-Anhui area indicates that they are the fragments of residual mantle after Phanerozoic thinning. The ancient formation age of continental lithospheric mantle is coupling with the age of overlying craton crust.
%K Re
%K Os isotope system
%K Age of continental lithospheric mantle
%K Model age
%K Jiangsu
%K Anhui provinces
%K Mantle peridotite<br>大陆岩石圈地幔定年
%K 模式年龄
%K 地幔橄榄岩
%K 捕虏体
%K 锇同位素
%K 地球化学特征
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=DBCF120055566B44&yid=14E7EF987E4155E6&vid=BCA2697F357F2001&iid=CA4FD0336C81A37A&sid=708DD6B15D2464E8&eid=13553B2D12F347E8&journal_id=1000-0569&journal_name=岩石学报&referenced_num=14&reference_num=61