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Re-Os isotope dating of pyrite from the footwall mineralization zone of the Xinqiao deposit, Tongling, Anhui Province： Geochronological evidence for submarine exhalative sedimentation

ISSN号：1000-4734
期刊名称：《矿物学报》
时间：0
分类：P618.41[天文地球—矿床学;天文地球—地质学] P597[天文地球—地球化学;天文地球—地质学]
作者机构：[1]State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China, [2]State Key Laboratory o fOre Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
相关基金：The authors are thankful to Chen Xiuting, Ma Yuntuo and Wang Hui of the Xinqiao Mine for their assistance in the field. This work was supported by the National Natural Science Foundation of China （40930742 and 40221301）, the Key Project of Natural Science Foundation of Jiangsu Province （BK2008026）, the National Key Technology R＆D Program （2009BAB43B03）, and a Ph.D. Program from the Foundation of the Min- istry of Education of China （1999028435）.

作者： GUO WeiMin[1], LU JianJun[1], JIANG ShaoYong[1], ZHANG RongQing[1], QI Liang[2]

关键词：海底喷流沉积, 同位素年代学, 矿化带, 同位素定年, 下盘, 安徽铜陵, 新桥, 证据, footwall mineralization, Re-Os isotope dating, exhalative sedimentation, Xinqiao deposit

中文摘要：

Xinqiao 存款位于 Tongling 区域，安徽省。这存款主导地由层状的硫化物 orebodies 组成，它在晚含碳的 Huanglong 形成的底从碎屑状的岩石被限制为过渡地区到碳酸盐。有在在层状的硫化物 orebodies 下面的矿脉基卒下盘岩石中的矿化作用的不和的细叶脉或网络。内在的不和的矿化作用地区与一致层状的硫化物 orebodies 共存，它被认为是海底的 exhalative 沉积形成的巨大的硫化物存款的最代表性的特征。这研究报导黄铁矿 187Re-187Os 319 的同位素的年龄

英文摘要：

The Xinqiao deposit is located in the Tongling area, Anhui Province. This deposit is dominantly composed of stratiform sulfide orebodies, which are restricted to the transitional zone from clasfic rocks to carbonates at the base of the Late Carboniferous Huanglong Formation. There are discordant veinlets or networks of mineralization in the footwall rocks below the stratiform sul- fide orebodies. The underlying discordant mineralization zones coexist with conformable stratiform sulfide orebodies, which are considered to be the most representative features of massive sulfide deposits formed by submarine exhalafive sedimentation. This study reports a pyrite 187Re-IS7Os isotopic age of 319±13 Ma （MSWD=16） for the footwall mineralization zone. This isochron age is consistent with the interval of strata hosting the conformable strafiform sulfide orebody, and provides direct geochronological evidence for Carboniferous exhalative sedimentary mineralization.

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