| 大兴安岭北段塔源二支线铅锌铜矿区岩浆岩岩石成因及其地质意义 |
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| 引用本文： | 刘宇轩,杨言辰,韩世炯,于秋阳.大兴安岭北段塔源二支线铅锌铜矿区岩浆岩岩石成因及其地质意义[J].世界地质,2022(1):38-55. |
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| 作者姓名： | 刘宇轩 杨言辰 韩世炯 于秋阳 |
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| 作者单位： | 吉林大学地球科学学院 |
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| 基金项目： | 中国地质调查局项目(DD20190437)。 |
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| 摘 要： | 塔源二支线铅锌铜矿床地处额尔古纳地块东南缘,位于得尔布干成矿带东段.为确定塔源二支线铅锌铜矿区岩浆岩的岩石成因及其地质意义,对矿区岩浆岩开展了岩石学、地球化学以及同位素年代学研究.笔者在矿区识别出两期岩浆作用,早期发生于(296.1±2.3)Ma(早二叠世),侵入体为二长闪长岩;晚期发生在(136.5±2.1)Ma(早...
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| 关 键 词： | 额尔古纳地块 大兴安岭 塔源二支线 锆石U-Pb定年 地球化学 |
Petrogenesis of magmatic rocks from Tayuanerzhixian Pb-Zn-Cu mining area in northern segment of Great Xing an Range and its geological significance |
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| LIU Yuxuan,YANG Yanchen,HAN Shijiong,YU Qiuyang.Petrogenesis of magmatic rocks from Tayuanerzhixian Pb-Zn-Cu mining area in northern segment of Great Xing an Range and its geological significance[J].World Geology,2022(1):38-55. |
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| Authors: | LIU Yuxuan YANG Yanchen HAN Shijiong YU Qiuyang |
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| Institution: | (College of Earth Sciences,Jilin University,Changchun 130061,China) |
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| Abstract: | The Tayuanerzhixian Pb-Zn-Cu deposit is located in the southeast margin of the Erguna block,which belongs to the eastern segment of the Derbugan metallogenic belt.In order to determine the petrogenesis and its geological significance of magmatic rocks in the Tayuanerzhixian Pb-Zn-Cu deposit,petrological,geochemical and geochronological study has been conducted.Two periods of magmatism were identified in the mining area:represented by the early monzodiorite emplaced at(296.1±2.3)Ma(Early Permian),and the quartz porphyry formed at(136.5±2.1)Ma(Early Cretaceous),and the latter is closely related to mineralization.The results show that the Early Permian monzodiorite is characterized by poor Si,rich Mg,rich Ca and low Al2O3 and TiO2,suggesting that the original magma may be derived from the partial melting of the depleted asthenosphere mantle metasomatized by subduction fluids or melts,which has a close relationship with the subduction of the Paleo-Asian Ocean.The Early Cretaceous quartz porphyry is rich in silicon,potassium and large ion lithophile elements Rb,K,Ba,belonging to the weakly peraluminous and high-K calc-alkaline series.The quartz porphyry is classified as A-type granite,probably derived from the partial melting of thickened/dismantled lower crust and formed in a post-orogenic extensional environment of the Mongolia-Okhotsk Ocean tectonic system. |
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| Keywords: | Erguna block Great Xing an Range Tayuanerzhixian zircon U-Pb dating geochemistry |
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