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东秦岭斑岩钼矿带的地质特征和成矿构造背景
引用本文:李诺,陈衍景,张辉,赵太平,邓小华,王运,倪智勇.东秦岭斑岩钼矿带的地质特征和成矿构造背景[J].地学前缘,2007,14(5):186-198.
作者姓名:李诺  陈衍景  张辉  赵太平  邓小华  王运  倪智勇
作者单位:1. 北京大学,造山带与地壳演化重点实验室,北京,100871
2. 中国科学院,广州地球化学研究所,成矿动力学重点实验室,广东,广州,510640;北京大学,造山带与地壳演化重点实验室,北京,100871
3. 中国科学院,地球化学研究所,贵州,贵阳,550002
4. 中国科学院,广州地球化学研究所,成矿动力学重点实验室,广东,广州,510640
基金项目:国家重点基础研究发展计划(973计划) , 国家自然科学基金
摘    要:东秦岭钼矿带包涵5个世界级超大型(>5×105tMo)、5个大型((5~10)×104tMo)和一些中小型(<5×104tMo)钼矿床,探明钼金属储量超过5×106t,是世界最大的钼矿带。钼矿带的北、南边界分别是三宝断裂和商丹断裂,两条断裂分别为秦岭造山带的反向边界逆冲断裂(RBT)和主中央滑脱断裂(MCT)。矿床类型有斑岩型、斑岩-夕卡岩型、夕卡岩型和碳酸岩脉型,以前两者为主。含钼岩浆岩主要是富硅、钾而贫铁、镁、钙的花岗斑岩,只有黄龙铺和黄水庵矿床为碳酸岩脉。同位素年龄资料显示,黄龙铺形成于220Ma左右,而其余的与花岗斑岩有关的钼矿床形成于160~110Ma。结合秦岭造山带构造演化分析,认为黄龙铺矿床形成于弧后伸展背景,而其他矿床及其成矿斑岩形成于陆-陆碰撞体制。

关 键 词:东秦岭  钼矿床  大陆碰撞  弧后伸展  构造背景
文章编号:1005-2321(2007)05-0186-13
修稿时间:2007年9月15日

Molybdenum deposits in East Qinling
Li Nuo,Chen Yanjing,Zhang Hui,Zhao Taiping,Deng Xiaohua,Wang Yun,Ni Zhiyong.Molybdenum deposits in East Qinling[J].Earth Science Frontiers,2007,14(5):186-198.
Authors:Li Nuo  Chen Yanjing  Zhang Hui  Zhao Taiping  Deng Xiaohua  Wang Yun  Ni Zhiyong
Abstract:The East Qinling molybdenum belt is probably the largest Mo belt in the world,including five world-class superlarge(>5×105 t Mo),five large((5~10)×104 t Mo)and several medium/small(<5×104 t Mo)deposits,containing >5×106 tonnes of contained Mo metal.The East Qinling Mo belt is situated between the San-Bao fault on the north and the Shang-Dan fault on the south.These two great faults are interpreted to be reverse boundary thrust(RBT)and main central thrust(MCT)of the Qinling orogen,respectively.The mineral systems that contain Mo,as one of the main metals,include porphyry,skarn,porphyry-skarn and carbonatite-veins,with the first two being the most important.Ore-associated intrusions are granite porphyries enriched in K and Si and poor in Mg,Fe and Ca.Two exceptions are the Huanglongpu and Huangshui'an deposits,whose orebodies are hosted in carbonatite veins.Isotopic age determinations show that the Huanglongpu deposit was formed at about 220 Ma,whereas the granite porphyry-associated Mo deposits were formed during 160-110 Ma.Based on the analysis of tectonic evolution of the Qinling orogen,we propose that the Huanglongpu deposit was formed in a back-arc extension area,and the other deposits and their related porphyries were formed in continental collision regimes.
Keywords:East Qinling  Mo belt  continental collision  back-arc extension  tectonic setting
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