桂东北苗儿山-越城岭南西部岩体内外接触带次生晕元素分布特征及其意义  

Ore-forming element distribution around the southwestern domain of the Miaoershan-Yuechengling complex in the northeastern Guangxi and its geological implication

作　　者：王春龙[1,2] 刘莎 伍静[1] 周育葛 石晓明 梁华英[1] 

机构地区：[1]中国科学院广州地球化学研究所矿物学与成矿学重点实验室,广东广州510640 [2]中国科学院大学,北京100049 [3]广西中科地质勘查有限责任公司,广西南宁530022 [4]广西有色金属集团有限公司,广西南宁530022

出　　处：《地球化学》2013年第5期405-413,共9页Geochimica

基　　金：国家自然科学基金(41172080,41272099,41121002);中国科学院重大项目(KZCX1-YW-3)

摘　　要：南岭成矿带西段苗儿山-越城岭复式岩体内及其内外接触带发育一系列矿床。通过对苗儿山-越城岭复式岩体南西部三条穿过复式岩体与地层接触带地球化学剖面中成矿元素分布特征的分析,发现成矿元素正异常主要和岩基中的晚期岩浆活动有关。结合野外观察及薄片鉴定发现的岩基与围岩接触带未发生蚀变等现象,提出苗儿山超单元南西部岩体及接触带中的矿床和早期岩基没有内在成因联系,成矿主要和岩基内晚期岩浆活动有关,晚期岩体是该区今后找矿的主要靶区。Many deposits have been found around the Miaoershan-Yuechengling complex pluton in the west of Nanling metallogenic belt. The complex pluton is composed of an early stage granitoid batholith and late stage small intrusions. To reveal which magmatic event corresponds to mineralization, ore-forming elements content of samples from three geochemical prospecting sections accross Miaoershan early stage granitoid batholith, late stage small intrusions occurred in the early stage granitoid batholith and the contact zone between the complex pluton and strata were analyzed. No positive anomaly of ore forming element （W, Sn, Mo, Cu, Pb, Zn, Ag） distribution have been found at the localities corresponding to the early stage granitoid batholith and its contact zone and positive anomalies of W and Sn, on the other hand, have been found at the localities corresponding to the occurrences of the late stage small intrusions. Based on the distribution of ore-forming element along the three geochemical prospecting sections, together with field observation that the adjacent strata around the early stage batholith did not underwent alteration, it is concluded that the mineralization events in the southwestern part of the Miaoershan-Yuechengling complex pluton are related to late stage magmatic activities and the ore-prospecting target should be constrained to the late stage intrusions occurred in or around the Miaoershan-Yuechengling complex pluton.

关 键 词：苗儿山-越城岭复式岩体 成矿元素分布 钨钼矿床 找矿 

分 类 号：P595[天文地球—地球化学]