| 安徽冬瓜山铜矿床的地球化学特征 |
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| 引用本文：李红阳,杨秋荣,李英杰,侯增谦,杨竹森,蒙义峰.2006.安徽冬瓜山铜矿床的地球化学特征[J].地球学报,27(6):551-556. |
| DOI：10.3975/cagsb.2006.06.05 |
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| 基金项目:国家自然科学基金项目(编号:P40272088)，国土资源部科技专项研究项目(编号:B0002_3) |
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| 中文摘要:冬瓜山铜矿床发育上部层状矿体和下部浸染状—脉状矿体,地球化学特征呈现出明显的垂向变化和二元结构性。从下部浸染状—脉状矿化岩石到上部层状块状矿石,CaO、MgO、Fe2O3、FeO、Cu、Au、Zn、Ag、As等含量和δ18O、δ12C值总体逐渐增高,SiO2、Al2O3、TiO2、K2O、Na2O、Pb、Hg、Sb、Mo、REE等含量和流体包裹体温度379·3℃→135·0℃及δ34S值总体逐渐降低。硬石膏δ34S值为 14·8‰~ 20·5‰,黄铁矿δ34S值为 2·7‰~ 7·9‰,含矿硅质岩δ18O为 12·0‰,含铜矿石中菱铁矿δ18O平均值为 13·97‰。地质地球化学特征反映冬瓜山铜矿床为海底热水喷流沉积成因。 |
| 中文关键词:铜矿床 二元结构 地球化学 安徽冬瓜山 |
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| Geochemical Characteristics of the Dongguashan Copper Deposit in Anhui Province |
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| Abstract:The Dongguashan copper deposit is characterized by a vertical variation and a “two-member texture”, evidently corresponding to its two-layer texture. CaO, MgO, Fe-2O-3, FeO, Cu, Au, Zn, Ag and As contents and average δ 18O and δ 13C values increase progressively from the lower disseminated-veinlet mineralized rocks (ores) to the upper stratiform ore beds, with SiO-2, Al-2O-3, TiO-2, K-2O, Na-2O, Pb, Hg, Sb, Mo and REE contents, the measured temperatures (from 379.3 ℃to 135.0 ℃) of fluid inclusions andδ 34S values decreasing gradually. The δ 34S values of anhydrite vary from +14.8‰ to +20.5‰, whereas those of pyrite are in the range of +2.7‰～ +7.7‰. The δ 18O value of the ore-bearing silicalite is +12.0‰, while the average δ 18O value of the siderite in copper-bearing sulfide ore is +13.97‰. Geological-geochemical characteristics show the Dongguashan copper deposit to be of submarine sedimentary exhalative origin. |
| keywords:copper deposit two-member texture geochemistry Dongguashan Anhui |
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