滇-黔相邻地区峨眉山玄武岩型自然铜-辉铜矿矿床的成矿规律及成矿前景分析  

ORE-FORMING REGULARITY AND PROSPECTS OF EMEISHAN BASALT-TYPE NATIVE COPPER-CHALCOCITE DEPOSITS IN THE ADJOINING AREA OF YUNNAN-GUIZHOU PROVINCES

作　　者：张乾[1] 王大鹏[1,2] 范良伍[1,2] 朱笑青[1] 张正伟[1] 

机构地区：[1]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵阳550002 [2]中国科学院研究生院,北京100039

出　　处：《地质与勘探》2008年第2期8-13,共6页Geology and Exploration

基　　金：中国科学院重要方向项目(编号:KZCX2-YW-111KZCX3-SW-125);国家937项目(编号:2007CB411408)资助

摘　　要：滇—黔相邻地区鲁甸—威宁一带产于峨眉山玄武岩中的自然铜矿床(点)经过几十年尤其是近5年来的研究,在成矿理论方面取得了重要进展,但在找矿勘探方面一直难以突破。文章重点讨论了与成矿规律和成矿远景有关的一些地质和地球化学问题,认为矿化受夹层和断裂双重控制,发现许多地质和地球化学特征不支持火山-岩浆热液成矿,成矿以后期热液作用为主。与基伟诺型矿床相比,有限的玄武岩体积、陆相地表喷发等因素对形成大矿是不利的,而峨眉山玄武岩分布区内玄武岩厚度巨大、构造应力集中、深部存在隐伏岩浆侵入活动三位一体的地区有可能找到中型规模以上的矿床。Some important progresses in the mineralization theory of the Emeishan basalt- type native copper- chalcocite deposits （occurrences） in the adjoining area of Yunnan--Guizhou provinces have been made by researches through several decade years in particular recent five years. However, it is difficult to break through in the prospecting and exploration. In this paper, some geological and geochemical questions related to the mineralization rule and prospects are discussed. Copper mineralization is controlled by beth tuffaceous - sedimentary intercalation and fault. Many geological and geochemical characteristics do not support the volcanic - magmatic hydrothermal mineralization origin, and the deposits were formed by the epigenetic hydrothermal. Compared with the Keweenaw - type copper deposits in U. S. A. , factors such as limited basalt volume and land surface eruption of the basalt in the adjoining area of Yunnan--Guizhou provinces are disadvantageous to form the large deposit. The focus of prospecting for this type of ore deposits should be put on the districts of western Yunnan and Sichuan, where there are spread basalt and cover strata of large thickness, with concentrative tectonic stress and magmatic intrusion at depth.

关 键 词：峨眉山玄武岩 自然铜-辉铜矿矿床(点)成矿规律成矿远景滇-黔相邻地区 

分 类 号：P618.41[天文地球—矿床学] P612[天文地球—地质学]