滇西兰坪盆地白秧坪Pb-Zn-Cu-Ag多金属矿床东矿带成矿年代学探讨
An investigation of metallogenic chronology of eastern ore block in Baiyangping Pb-Zn-Cu-Ag polylmetallic ore deposit, Lanping Basin, western Yunnan Province
查看参考文献68篇
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文摘
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白秧坪Pb-Zn-Cu-Ag多金属矿集区夹持于金沙江和澜沧江断裂之间,隶属兰坪盆地北部,分为东、西2个矿带。文章采用闪锌矿、方铅矿的Rb-Sr法和成矿阶段方解石的Sm-Nd法,对白秧坪Pb-Zn-Cu-Ag多金属矿床东矿带华昌山和下区五矿段进行了成矿年代厘定,获得方铅矿以及闪锌矿和方铅矿的矿物组合Rb-Sr等时线年龄为(32.8±1.5) Ma,方解石的Sm-Nd等时线年龄为(33.32±0.43) Ma。研究表明,通过对特定矿床的主要矿石矿物采用Rb-Sr法和Sm-Nd法获得的年龄在误差范围内是一致的,从而起到了相互验证的作用,并对矿床的成矿背景具有一定的指示性。通过成矿年龄的探讨,认为东矿带铅锌为主的矿化期主要产生于青藏高原东缘晚碰撞阶段(40~26) Ma,伴随印度-亚洲大陆碰撞造山,形成逆冲推覆构造和赋矿地层,控制了Pb-Zn矿床的形成和发育。该期Pb-Zn矿床与兰坪盆地金顶和西矿带Pb-Zn矿床、囊谦盆地Pb-Zn矿床和沱沱河盆地Pb-Zn矿床具有一定的可比性。 |
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其他语种文摘
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As one part of the northern Lanping Basin, the Baiyangping Pb-Zn-Cu-Ag polymetallic ore district is located between the Jinshajiang fault and the Lancangjiang fault. On the basis of the sphalerite/galena Rb-Sr and calcite Sm-Nd dating, this study provides preferable ore-forming ages (32.8 ± 1.5) Ma and (33.32 ± 0.43) Ma for the Huachangshan and Xiaquwu ore plates in Baiyangping Cu-Pb-Zn-Ag polymetallic ore district, western Yunnan Province, China. The results suggest that the Rb-Sr and Sm-Nd dating data are consistent within the error range,which, in addition, has certain instruction significance for understanding the deposit metallogenic background. Moreover, due to the age of mineralization, Pb-Zn mineralization period in eastern ore belt mainly produced between 40 Ma and 26 Ma when late collision appeared in east edge of the Qinghai-Tibet plateau. Thrustnappe system and hosted ore strata were formed due to the collision and orogenesis between India and Asia, and then Pb-Zn ore deposits occurred. This period of Pb-Zn ore deposit can be compared with other similar deposits in Jingding, Nangqian,and Tuotuohe. |
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来源
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矿床地质
,2017,36(3):691-704 【核心库】
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DOI
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10.16111/j.0258-7106.2017.03.010
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关键词
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地球化学
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成矿年代
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东矿带
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Cu-Pb-Zn-Ag多金属矿床
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白秧坪
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兰坪盆地
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滇西
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地址
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1.
西北大学地质系, 大陆动力学国家重点实验室, 陕西, 西安, 710069
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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Department of Geology, University of Regina, 加拿大, Regina, S4S 0A2
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青海省西宁市武警黄金第六支队, 青海, 西宁, 810021
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语种
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中文 |
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文献类型
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综述型 |
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ISSN
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0258-7106 |
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学科
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地质学 |
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基金
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国家自然科学基金
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国家973计划
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文献收藏号
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CSCD:6009434
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