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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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SHRIMP dating and Nd-Sr isotopic Tracing of Kangguertage ophiolite in eastern Tianshan, Xinjiang
东天山康古尔塔格蛇绿岩SHRIMP年龄、Nd-Sr同位素特征及构造意义
LI WenQian, MA HuaDong, WANG Ran, WANG He, XIA Bin Key Laboratory of Metallogenic Dynamics, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China China Non-ferrous Metals Fesouree Geological Survey, Beijing, China Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China Graduate School of the Chinese Academy of Sciences, Beijing, China,
李文铅, 马华东, 王冉, 王核, 夏斌
Keywords: SSZ-type ophiolite,SHRIMP dating,Nd-Sr isotopes,Kuangguertage,eastern Tianshan
SSZ型蛇绿岩,SHRIMP测年,Nd-Sr同位素,康古尔塔格,东天山
Abstract:
通过对东天山康古尔塔格蛇绿岩中的辉长岩的SHRIMP锆石U-Pb年龄测定,得出康古尔塔格蛇绿岩形成于晚寒武世-早奥陶世(494±10Ma)。Nd-Sr同位素研究表明,康古尔塔格蛇绿岩中辉长岩、辉绿岩、玄武岩、斜长花岗岩及角斑岩的ε_(Nd)(t)值变化于 5.7～ 10.5之间,与现代大洋岛弧火山岩的ε_(Nd)(t)值一致;(~(87)Sr/~(86)Sr)_i值变化于0.703475～0.704923之间,与现代典型大洋中脊新鲜玄武岩的~(87)Sr/~(86)Sr值变化范围基本一致。上述特征显示出康古尔塔格蛇绿岩与准噶尔蛇绿岩一样,属SSZ型蛇绿岩,其岩浆来自亏损上地幔,且在演化过程中没有受到陆源物质的明显混染。该蛇绿岩形成时代、源区组成结合区域地质构造等暗示康古尔塔格断裂以北地区可能属于准噶尔板块范畴。 Full-Text
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