东天山哈尔里克山区二叠纪高钾钙碱性花岗岩成因及地质意义

汪传胜, 顾连兴, 张遵忠, 吴昌志, 唐俊华, 汤晓茜. 东天山哈尔里克山区二叠纪高钾钙碱性花岗岩成因及地质意义[J]. 岩石学报, 2009, 25(6): 1499-1511.
引用本文: 汪传胜, 顾连兴, 张遵忠, 吴昌志, 唐俊华, 汤晓茜. 东天山哈尔里克山区二叠纪高钾钙碱性花岗岩成因及地质意义[J]. 岩石学报, 2009, 25(6): 1499-1511.
WANG ChuanSheng, GU LianXing, ZHANG ZunZhong, WU ChangZhi, TANG JunHua, TANG XiaoQian. Petrogenesis and geological implications of the Permian high-K calc-alkaline granites in Harlik Mountains of eastern Tianshan, NW China[J]. Acta Petrologica Sinica, 2009, 25(6): 1499-1511.
Citation: WANG ChuanSheng, GU LianXing, ZHANG ZunZhong, WU ChangZhi, TANG JunHua, TANG XiaoQian. Petrogenesis and geological implications of the Permian high-K calc-alkaline granites in Harlik Mountains of eastern Tianshan, NW China[J]. Acta Petrologica Sinica, 2009, 25(6): 1499-1511.

东天山哈尔里克山区二叠纪高钾钙碱性花岗岩成因及地质意义

  • 基金项目:

    国家重点基础研究发展规划项目(2007CB411301-4, 2001CB409802)、国家自然科学基金项目(40472042, 40672040, 40603008)和西北大学大陆动力学国家重点实验室开放课题基金资助(06LCD02)

Petrogenesis and geological implications of the Permian high-K calc-alkaline granites in Harlik Mountains of eastern Tianshan, NW China

  • 本文从岩石学、地球化学和同位素等方面讨论东天山克拉麦里-哈尔里克岛弧东段八大石和小铺东两个岩体的特征和成因。八大石岩体和小铺东岩体主要为二长花岗岩,SiO2含量分别为61.92%~74.40%和69.17%~74.92%,K2O+Na2O的含量分别为6.50%~8.32%和7.74%~8.14%,绝大部分岩石具有高钾钙碱性花岗岩特征;∑REE分别为105×10-6~210×10-6和100×10-6~172×10-6,(La/Yb)CN分别为4.1~8.9和9.1~15.3,配分模式右倾,δEu分别为0.40~0.93和0.59~0.80,为中-低负异常;两个岩体均富Rb、Ba等大离子亲石元素和Th、U、Hf、Zr等高场强元素,而贫Ta、Nb、Sr、Ti等。通过LA-ICP-MS分析得到八大石岩体中锆石206Pb/238U加权平均年龄为298±2Ma,表明岩体形成于早二叠纪,计算得到八大石和小铺东岩体的模式年龄tDM分别为944Ma和648Ma;八大石和小铺东岩体的εNd(t)u分别为+3.06和+4.47,(87Sr/86Sr) i分别为0.70475和0.70384,表现出高εNd(t)u 低(87Sr/86Sr) i。综上所述,认为哈尔里克高钾钙碱性花岗岩可能为碰撞后挤压-伸展转折阶段的产物,主要由来自新生地壳的中钾钙碱性岩浆经过结晶分异作用而成。
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出版历程
收稿日期:  2007-12-13
修回日期:  2008-07-08
刊出日期:  2009-06-30

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