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| 西秦岭与埃达克岩和喜马拉雅型花岗岩有关的金铜成矿及找矿问题 | |
| 引用本文： | 张旗,殷先明,殷勇,金惟俊,王元龙,赵彦庆.西秦岭与埃达克岩和喜马拉雅型花岗岩有关的金铜成矿及找矿问题[J].岩石学报,2009,25(12):3103-3122. |
| 作者姓名： | 张旗 殷先明 殷勇 金惟俊 王元龙 赵彦庆 |
| 作者单位： | 1. 中国科学院地质与地球物理研究所,北京,100029 2. 甘肃省地矿局,兰州,730000 3. 甘肃地矿科技信息中心,兰州,73000 4. 甘肃省地质调查院,兰州,73000 |
| 基金项目： | 国家自然科学基金重大研究计划 |
| 摘 要： | 秦岭金矿分布广,目前学术界大多认为分属于造山型和卡林型金矿两类.该区印支期花岗岩发育,大多具有埃达克岩和喜马拉雅型花岗岩(低Sr和Yb)的特点,与金铜矿在时空分布上相关.美国内华达州卡林型金矿是世界级的金矿聚集区.与卡林型金矿有关的第三纪岩浆岩(中酸性火山岩和浅成花岗岩)也具有埃达克岩和喜马拉雅型花岗岩的地球化学特征,暗示内华达卡林型金矿也来源于加厚下地壳的底部.本文讨论了埃达克岩和喜马拉雅型花岗岩有利于成矿的机理,并根据西秦岭金矿与花岗岩分布的关系,提出以夏河-宕昌-两当-凤县为界将西秦岭划分为南北两个成矿区和13个成矿聚集区:北区花岗岩发育,有利于寻找斑岩型、夕卡岩型等热液型金铜矿床;南带侵入岩少而小,有利于寻找远离岩体的金矿(包括卡林型等).鉴于西秦岭印支期埃迭克岩和喜马拉雅型花岗岩发育,金铜尤其是金矿分布多,储量大,且大多与埃达克岩或喜马拉雅型花岗岩有关,可能是中国金矿最具潜力的地区,有利于特大型金铜矿的产出,可能发展成为中国最大的金矿聚集区.为此,建议加强本区花岗岩与金铜成矿关系的研究,革新找矿思路和找矿技术方法,以实现找矿的新突破. |
| 关 键 词： | 西秦岭 埃达克岩 喜马拉雅型花岗岩 金矿 铜矿 卡林型 斑岩型 |
| 收稿时间： | 2009/4/23 0:00:00 |
| 修稿时间： | 2009/8/17 0:00:00 |
Issues on metallogenesis and prospecting of gold and copper deposits related to adakite and Himalayan type granite in west Qinling |
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| ZHANG Qi,YIN XianMing,YIN Yong,JIN WeiJun,WANG YuanLong and ZHAO YanQing.Issues on metallogenesis and prospecting of gold and copper deposits related to adakite and Himalayan type granite in west Qinling[J].Acta Petrologica Sinica,2009,25(12):3103-3122. | |
| Authors: | ZHANG Qi YIN XianMing YIN Yong JIN WeiJun WANG YuanLong and ZHAO YanQing |
| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Gansu Provincial Bureau of Geology and Mineral Exploration and Development, Lanzhou 730000, China;Gansu Geology and Mineral Resources Information Center, Lanzhou 730000, China;Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Geological Survey of Gansu Province, Lanzhou 730000, China |
| Abstract: | Gold deposits spreading extensively in west Qinling have been grouped into such two types as orogenic type and Carlin type, which is accepted by most researchers of the present academic field. In the study area developed Indo-chinese epoch granite, most of which have the characteristics of adakite and Himalayan type granite (relatively low content of Sr and Yb), and related to distribution of gold and copper deposits spatially and timely. The study on Carlin type gold deposits in Nevada, USA show that it is a world-level concentration area of gold deposit, Tertiary igneous rock (intermediate-acid rock and hypabyssal granite) related to gold and copper deposits have the geochemical characteristics of adakite and Himalayan type granite which indicate that the sources of Carlin type gold deposit in Nevada come from the bottom of thickened lower crust. In the paper the metallogenetic mechanism of adakite and Himalayan type granite was discussed, west Qinling was divided into two metallogenetic regions as north and south with the boundary of Xiahe-Tanchang-Liangdang-Fengxian, including 13 metallogenetic concentration areas. In the north region, the developed granite is favorable to search porphyry type, skarn type and hydrothermal type gold and copper deposit; in the south region, it is good to search gold deposits away from igneous rock mass (including Carlin type, sedimentary type, rupture zone type and altered rock type, etc.). West Qinling where Indo-chinese adakite and Himalayan type granite developed extensively, most gold and copper deposits with the features of wide distribution and high reserves are related to adakite and Himalayan type granite should be developed the most potential gold region. |
| Keywords: | West Qinling Adakite Himalayan type granite Gold deposit Copper deposit Carlin type Porphyry type |
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