| 安徽铜陵矿集区斑岩型铜钼金矿床地质特征及成矿背景 |
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| 引用本文： | 范子良,徐晓春,陈林杰,何俊,谢巧勤.安徽铜陵矿集区斑岩型铜钼金矿床地质特征及成矿背景[J].岩石学报,2016,32(2):351-368. |
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| 作者姓名： | 范子良 徐晓春 陈林杰 何俊 谢巧勤 |
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| 作者单位： | 合肥工业大学资源与环境工程学院, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009,安徽省地质矿产勘查局321地质队, 铜陵 244033,合肥工业大学资源与环境工程学院, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009 |
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| 基金项目： | 本文受国家自然科学基金项目(41472066、41172085、40972063)和安徽省国土资源厅科技项目(2012-K1)联合资助. |
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| 摘 要： | 铜陵矿集区以发育大型和为数众多的矽卡岩型矿床而闻名于世,而近年来作为该区找矿的重要成果和突破则是斑岩型矿床和矿化的陆续发现。本文以铜陵矿集区3个代表性斑岩型矿床为研究对象,在详细的野外地质调查和室内显微观察研究的基础上,开展了较为系统的矿床地质和地球化学研究,阐述了斑岩型矿床的地质特征,确定了含矿侵入岩体的地质和地球化学特征,分析了矿床蚀变特征和流体包裹体特征,探讨了成岩成矿的大地构造背景,并与世界典型斑岩型矿床进行了对比。研究表明,铜陵矿集区斑岩型铜钼金矿床通常发育于含矿岩体的围岩或盖层为砂岩、砂页岩或硅质岩的条件下,含矿岩体为富碱低镁高钾准铝质钙碱性系列中浅成侵入岩体,具有与埃达克岩一致的地球化学特征;与世界典型斑岩型矿床含矿岩体对比,岩体侵位较深,有些矿区多期多相特征不明显;含矿岩体发育钾硅酸盐化、黄铁绢英岩化、青磐岩化等热液蚀变且有一定的分带性,但各矿床蚀变特征略有不同;矿床矿石矿物中富气相、富液相和含子晶多相包裹体共生,流体包裹体均一温度和盐度演化特征显示具有岩浆作用控制的高温热液型矿床特征。结合区域构造演化,作者确定铜陵矿集区斑岩型矿床属大陆环境斑岩型矿床,成矿作用发生于陆内造山作用由挤压向拉张转化的动力学背景之下,斑岩型矿床与矽卡岩型矿床及热液脉状矿床共同构成受统一的岩浆热液系统控制的矿床系列。
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| 关 键 词： | 斑岩型矿床 铜钼金矿床 围岩蚀变特征 矿床系列 地质和地球化学特征 安徽铜陵矿集区 |
| 收稿时间： | 1/1/2015 12:00:00 AM |
| 修稿时间： | 2015/3/20 0:00:00 |
The geological features and metallogenic setting of the porphyry copper-molybdenum-gold deposits in Tongling ore district, Anhui Province |
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| FAN ZiLiang,XU XiaoChun,CHEN LinJie,HE Jun and XIE QiaoQin.The geological features and metallogenic setting of the porphyry copper-molybdenum-gold deposits in Tongling ore district, Anhui Province[J].Acta Petrologica Sinica,2016,32(2):351-368. |
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| Authors: | FAN ZiLiang XU XiaoChun CHEN LinJie HE Jun and XIE QiaoQin |
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| Institution: | School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China,Geological 321 Team, Bureau of Geology and Mineral Resources Exploration of Anhui Province, Tongling 244033, China,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China and School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China |
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| Abstract: | Tongling ore district is very famous in the world for its skarn deposits in large scale and quantity. As an important penetration of the ore prospecting in recent years, several porphyry deposits were successively discovered. In this paper, three porphyry deposits from Tongling ore district are chose to study. Based on the detailed field geology and indoor microscopic observation as well as systematical ore geological and geochemical studies, the geological features of the porphyry deposits and their metallogenic geological setting are recognized. It is suggested that the ore-bearing intrusions are high-K calc-alkaline association with high Al, Sr and LREE, which is similar to the geochemical signatures of adakite. The ore-bearing intrusions are fine-middle grained texture, seldom porphyritic texture, which implies the intrusions intruded in middle-shallow depth. The wall-rock of the ore-bearing intrusions are usually sandstone, sandshale or chert, show their dense texture is favorable to close the metallogenic fluids. The alteration types developed in the ore-bearing intrusions are mainly K-silicatization, beresitization(agillization) and propylitization, but they are different in three different deposits. These characteristics of the alteration assemblages and zoning are similar to those of the world typical porphyry deposits. The paragenetic relationship of three types of the fluid inclusions, liquid-rich phase, vapor-rich phase and daughter mineral-bearing multiphase, indicate that the evolution of the metallogenic process may experience pressure dropping and fluid boiling. The ore-forming temperatures and salinities of the ore deposits are characterized by the intrusion-related hypothermal system with high temperature. Combining with the discussion of the regional tectonic evolution, it is confirmed that the porphyry deposits in the Tongling ore district belong to continental environmental porphyry deposits, and the metallogeny happened under the dynamic background from compression transformed to tension in the intracontinental orogenic environment. The porphyry deposits, skarn deposits and vein deposits in the ore district are controlled by a unified magmatic hydrothermal system, and they constitute a complete relative metallogenic series. |
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| Keywords: | Porphyry deposit Cu-Mo-Au ore deposit Wall-rock alteration characteristics Metallogenic series Geological and geochemical characteristics Tongling ore district of Anhui Province |
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