| 青藏高原羌塘东部尕考查锐-西恰赛索闪长岩体特征及构造意义 |
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| 引用本文： | 李莉,白云山,牛志军,段其发,卜建军.青藏高原羌塘东部尕考查锐-西恰赛索闪长岩体特征及构造意义[J].地质与资源,2009,18(4):250-255. |
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| 作者姓名： | 李莉 白云山 牛志军 段其发 卜建军 |
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| 作者单位： | 宜昌地质矿产研究所, 湖北 宜昌 443005 |
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| 基金项目： | 中国地质调查局"1:25万直根尕卡幅区调"项目 |
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| 摘 要： | 尕考查锐-西恰赛索闪长岩体由黑云母石英闪长岩和不等粒辉长闪长岩组成，其单颗粒锆石U-Pb年龄为183 Ma，形成于早侏罗世.岩石富铝，属钙碱性系列.微量元素特征表现为：富集大离子亲石元素K、Rb、Ba及高场强元素Th，相对于其他相邻元素而言，Nb、Ta、P、Ti、Y略显亏损，（87Sr/86Sr）i值为0.70424~0.70581，而εNd（t）值为-0.6~+21.6，形成于岛弧环境.
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| 关 键 词： | 羌塘东部 尕考查锐及西恰赛索 闪长岩 岩体 构造意义 青海省 |
| 收稿时间： | 2009-05-11 |
GEOCHEMICAL CHARACTERISTICS AND TECTONIC SIGNIFICANCE OF THE GAKAOCHARUI-XIQIASAISUO DIORITE IN EASTERN QIANGTANG,QINGHAI-TIBET PLATEAU |
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| LI Li,BAI Yun-shan,NIU Zhi-jun,DUAN Qi-fa,BU Jian-jun.GEOCHEMICAL CHARACTERISTICS AND TECTONIC SIGNIFICANCE OF THE GAKAOCHARUI-XIQIASAISUO DIORITE IN EASTERN QIANGTANG,QINGHAI-TIBET PLATEAU[J].Geology and Resources,2009,18(4):250-255. |
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| Authors: | LI Li BAI Yun-shan NIU Zhi-jun DUAN Qi-fa BU Jian-jun |
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| Institution: | Yichang Institute of Geology and Mineral Resources, Yichang 443005, Hubei Province, China |
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| Abstract: | The Gakaocharui-Xiqiasaisuo diorite rock body mainly consists of biotitic quartz diorite and gabrrodiorite.The pluton was formed in a volcanic arc environment in Early Jurassic defined by single zircon age of 183 Ma.The rocks are geochemically calc-alkaline and characterized by high Al,enriched K,Ba,Rb and Th,slight HFSE depletion such as Nb,Ta,P,Ti and Y.The initial Sr isotopes vary between 0.70424 and 0.70581,with high εNd(t) ranging from-0.6 to +21.6. |
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| Keywords: | Eastern Qiangtang Gakaocharui-Xiqiasaisuo diorite pluton tectonic significance Qinghai Province |
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