| 北祁连桦树沟铜矿床矿物学和硫同位素特征及其成矿意义 |
| Received:December 03, 2014 Revised:November 25, 2015 点此下载全文 |
| 引用本文：YANG XiuQing,ZHANG ZuoHeng,DUAN ShiGang,ZHAO XinMin,TIAN HongHai,YANG ZuoHua.2016.Mineralogical and sulfur isotope characteristics of Huashugou copper deposit i n Northern Qilian: Implications for metallogenesis[J].Mineral Deposits,35(1):185~195 |
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| Author Name | Affiliation | E-mail | | YANG XiuQing | School of Earth and Space Sciences, Peking University, Beijing 100871, China
MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | xiuqing2008@126.com | | ZHANG ZuoHeng | Chinese Academy of Geological Sciences, Beijing 100037, China | zuoheng@hotmail.com | | DUAN ShiGang | MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | | ZHAO XinMin | Xi'an Center of China Geological Survey, Xi'an 710054, Shaanxi, China | | | TIAN HongHai | J ingtieshan Mine, Jiuquan Iron and Steel Group, Jiayuguan 735100, Gansu, China | | | YANG ZuoHua | J ingtieshan Mine, Jiuquan Iron and Steel Group, Jiayuguan 735100, Gansu, China | |
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| 基金项目:本文由国土资源部公益性行业专项(编号: 200911007-16)和中国地质调查局地质调查项目(编号: 1212011120988)联合资助 |
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| 中文摘要:桦树沟铜矿床位于北祁连加里东造山带西段。铜矿体赋存于镜铁山BIF 型铁矿床桦 树沟矿区FeⅤ矿体下盘,矿体受断裂构造控制,矿化岩石主要为铁碧玉岩、石英绢云母千枚 岩和碳质千枚岩,围岩蚀变可见硅化、碳酸盐化、绢云母化和绿泥石化。文章对块状铜 矿石(富铜矿体)和脉状铜矿石(千枚岩型铜矿体)进行了野外地质特征、矿物学和硫同位 素对比研究。富铜矿体与地层产状基本一致,块状矿石矿物组合为黄铜矿+少量黄铁矿+石英 +碳酸盐矿物+重晶石,黄铜矿低S、Cu,高Fe。脉状矿石主要表现为石英-碳酸盐-硫化物脉 沿千枚理或裂隙产出,矿石矿物组合为黄铜矿+黄铁矿+黝铜矿+镜铁矿+石英+碳酸盐矿物+绢 云母+绿泥石,黄铜矿低S高Fe。块状铜矿石中黄铜矿的δ34S变化范围为156‰～17 4‰,暗示硫主要来自同期海水。脉状矿石中硫化物的δ34S值低于块状矿石中黄铜 矿的δ34S值, 黄铜矿、黄铁矿的δ34S值变化范围分别为132‰～162‰和93‰～134‰,暗 示硫可能主 要来自受还原的硫化物和硫酸盐矿物。以上研究表明块状铜矿石和脉状铜矿石可能 为不同热事件的产物,结合前人研究成果,笔者认为桦树沟铜矿床为海底喷流沉积叠加后期 热液改造成因。绿泥石温度计指示后期热液成矿温度为222℃左右。 |
| 中文关键词:地质学 矿物化学 硫同位素 铜矿床 桦树沟 北祁连 |
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| Mineralogical and sulfur isotope characteristics of Huashugou copper deposit i n Northern Qilian: Implications for metallogenesis |
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| Abstract:The Huashugou copper deposit is located in the western part of the Northern Qili an Caledonian orogenic belt. Copper orebodies exist at the footwall of the FeⅤ i ron orebody in Huashugou mine of the Jingtieshan BIF-type iron deposit, and are controlled by faults. The Cu mineralization mainly occurs in iron jasperite, qua rtz-sericite phyllite and carbonaceous phyllite. Wall-rock alteration includes s ilicification, carbonatization, sericitization and chloritization. This paper pr esents a detailed comparative description of the field geology, mineral chemistr y and sulfur isotope compositions of massive copper ores (mainly hosted in high- grade copper orebodies) and vein-type copper ores (mainly hosted in phyllite-typ e copper orebodies). The attitude of the high-grade copper orebodies is concorda nt with the strata. The copper ores are composed of chalcopyrite with low conten t of Cu, S and high content of Fe, as well as minor pyrite, quartz, carbonate mi nerals and barite. Nevertheless, the vein-type copper ores occur as quartz-carbo nate-sulfide vein, and are distributed along phyllitic foliation or in the fissu re. The copper ores are composed of chalcopyrite with low content of S and high content of Fe, pyrite, tetrahedrite, specularite, quartz, carbonate minerals, se ricite and chlorite. The δ34S values of chalcopyrite from massive copper ores r ange from 156‰ to 174‰, which suggests a contemporaneous marine origin. Th e δ34S values of sulfides from vein-type ores are significantly lower than the v alues of massive ores. The δ34S values of chalcopyrite vary from 132‰ to 162‰, and the δ34S values of pyrite vary from 93‰ to 134‰, wh ich suggests tha t the sulfur was derived from early sulfide and sulfate dominated by hy drothermal reduction. All of the above data indicate that massive ores and vein- type ores are products of different thermal events. Combined with previous studi es, the authors hold that the Huashugou copper deposit belongs to submarine exha lation sedimentation-late hydrothermal fluids reform type. The chlorite geotherm ometer indicates that ore-forming temperature of the late hydrothermal stage is 222℃. |
| keywords:geology, mineral chemistry, sulfur isotope, copper deposit, H uashugou, Northern Qilian |
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