Sm-Nd dating and Nd-Sr isotopic characteristics of the Shimian ophiolite suiten,Sichuan Province

被引：2
作者：
SHEN Weizhou
Geological Survey Institute
机构：
来源：
Chinese Science Bulletin | 2002年 / 22期
基金：
中国国家自然科学基金;
关键词：
Sm-Nd dating; Nd-Sr isotopes; ophiolite suite; back-arc basin; Shimian County; Sichuan Province;
D O I：
暂无
中图分类号：
P588 [岩石分类];
学科分类号：
070901 ;
摘要：
By mcasuring the Sm-Nd and Rb-Sr isotopiccompositions of harzburgite and gabbro from Shimianophiolite suite, we got the whole rock Sm-Nd isochron age of(938 ± 30) Ma (2σ), and the e Nd of 7.6 ± 0.8 (2σ), which showsthat the ophiolite was formed at the Early Neoproterozoic.The obvious change (0.70209-0.70708) of Isr values of theophiolite is caused by the meteoric hydrothermal alteration.The high εNd values indicate that the primitive magma wasderived from the intense depleted mantle rescrvoir. It is sug-gested that this area was in a back-arc basin environmentduring the Early Neoproterozic.
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页码：1897 / 1901
页数：5
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