北东帕米尔木吉乡琼让二云母花岗岩的成因及其成矿意义
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本文为国家重点研发计划子课题(批准号:2021YFC2901904)和新疆维吾尔自治区重点研发任务(编号:2022B03015- 2)的成果


Petrogenesis and metallogenic significance of Qiongrang two- mica granites in Muji Town, NE Pamir
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    摘要:

    西昆仑—帕米尔地区三叠纪花岗岩与古特提斯演化和稀有金属成矿密切相关。本文对北东帕米尔阿克陶县木吉乡南西琼让二云母花岗岩进行了系统岩相学、锆石U- Pb年代学、主微量元素地球化学及锆石Hf同位素研究。年代学测试结果显示,琼让二云母花岗岩为晚三叠世岩浆活动的产物。地球化学特征显示,二云母花岗岩富SiO2(73. 24% ~ 74. 09%)、Al2O3(14. 50% ~ 15. 01%)和K2O(5. 52% ~ 5. 75%),贫TiO2(0. 15% ~ 0. 18%)、MgO(0. 30% ~ 0. 37%),且呈强过铝质的地球化学特征(A/CNK = 1. 12 ~ 1. 15)。岩石具有明显的轻重稀土分馏((La/Yb)N= 44. 62 ~ 54. 58)及Eu负异常(Eu/Eu* = 0. 52 ~ 0. 59)。在微量元素原始地幔标准化蜘蛛网图中,琼让二云母花岗岩明显富集大离子亲石元素(如,Rb、Th、U、K)与轻稀土元素,亏损Sr、Ba、Nb、Ta、Ti、P和重稀土元素。综合分析认为,琼让二云母花岗岩属S- 型花岗岩,为变泥质岩源经云母脱水熔融而成。琼让二云母花岗岩中岩浆锆石εHf(t) = -7. 93 ~ -0. 91,大红柳滩地区钙碱性花岗岩锆石εHf(t) = -8. 8 ~ -1. 4。琼让二云母花岗岩中含较高的Li和Be,且形成时间与构造环境与大红柳滩锂铍伟晶岩矿类似,推测木吉三叠纪花岗岩具有明显的硬岩型锂铍矿找矿潜力。

    Abstract:

    The Triassic granites in the West Kunlun—Pamir region is intricately linked to the evolution of the ancient Paleo- Tethys and metallogenesis of rare metals. Through the geochemical test of Qiongrang two- mica granites, the metallogenic potential of Li—Be rare metal deposit is determined in Muji area.Results:We conducted a comprehensive study of the petrology, zircon U- Pb geochronology, major and trace element geochemistry, and zircon Hf isotopic analysis of two- mica granites from the Qiongrang, SW Muji, NE Pamir. Zircon U- Pb dating yield the age of around 211.6 Ma, suggesting two- mica granites from the Qiongrang emplaced at Late Triassic. The two- mica granites from the Qiongrang exhibit high levels of SiO2 (73.24% ~ 74.09%), Al2O3 (14.50% ~ 15.01%), and K2O (5.52% ~ 5.75%), and low TiO2 (0.15% ~ 0.18%) and MgO (0.30% ~ 0.37%). They also exhibit strongly peraluminous geochemical features (A/CNK = 1.12 ~ 1.15). The studied rocks are rich in Rb, Th, U, K and LREE, depleted in Sr, Ba, Nb, Ta, Ti, P and HREE, with obviously fractionation of LREE and HREE ((La/Yb)N = 44.62 ~ 54.58) and negative Eu anomaly (Eu/Eu* = 0.52 ~ 0.59), belonging to strongly differentiated S- granite, formed by the dehydration melting of mica from metamudstone sources. The zircon εHf(t) value of two- mica granites from the Qiongrang from -7.93 to -0.91, and the zircon εHf(t) value of the Dahongliutan granites range from -8.8 to -1.4. Conclusions: The Qiongrang two- mica granites in Muji Town contain relatively high levels of Li and Be, and they are closely related in time—space to the Dahongliutan rare metal pegmative veins, it is speculated that the Qiongrang two- mica granites in Muji Town possess significant potential for the exploration of hard- rock lithium—beryllium mineralization.

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钱旭坤,刘晓强,马华东,西艾力·阿尔肯,宋志豪.2024.北东帕米尔木吉乡琼让二云母花岗岩的成因及其成矿意义[J].地质论评,70(6):2024060029,[DOI].
QIAN Xukun, LIU Xiaoqiang, MA Huadong, XIAILI Aerken, SONG Zhihao.2024. Petrogenesis and metallogenic significance of Qiongrang two- mica granites in Muji Town, NE Pamir[J]. Geological Review,70(6):2024060029.

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  • 收稿日期:2024-09-24
  • 最后修改日期:2024-12-12
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  • 在线发布日期: 2024-12-19
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