投稿时间：2016-02-26
修订日期：2017-04-30
网络发布日期：2017-07-04
中文摘要: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。
Abstract: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. Thrust-nappe 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.
keywords:geochemistry metallogenic chronology eastern ore block Cu-Pb-Zn-Ag polymetallic ore deposit Baiyangping Lanping Basin west Yunnan Province
文章编号：
中图分类号：P618.41;P618.42;P618.43;P618.52
文献标志码：
基金项目:本文得到国家自然科学基金（编号：40972071、41373028、41573022）和"973"项目（编号：2015CB452603）资助
引用文本：
冯彩霞,刘燊,毕献武,胡瑞忠,池国祥,陈俊瑾,冯强,郭晓磊.2017.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[J].矿床地质,36(3):691~704FENG CaiXia,LIU Shen,BI XianWu,HU RuiZhong,CHI GuoXiang,CHEN JunJin,FENG Qiang,GUO XiaoLei.2017.An investigation of metallogenic chronology of eastern ore block in Baiyangping Pb-Zn-Cu-Ag polylmetallic ore deposit, Lanping Basin, western Yunnan Province[J].Mineral Deposits36(3):691~704
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