初论广西大瑶山地区多期次花岗质岩浆活动与成矿系列  

A preliminary study of multi-stage granitoids and related metallogenic series in Dayaoshan area of Guangxi,China

作　　者：陈懋弘[1] 李忠阳[2] 李青 韦子任[2] 黄宏伟 张志强[4] 肖柳阳 

机构地区：[1]中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室,北京100037 [2]广西第六地质队,广西贵港537100 [3]广西地质矿产勘查开发局,广西南宁530023 [4]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《地学前缘》2015年第2期41-53,共13页Earth Science Frontiers

基　　金：国家重点基础研究发展计划"973"项目(2012CB416704);广西地矿局部门预算前期地质勘查项目(桂地矿地[2014]17);中国地质调查局工作项目(1212011120831)

摘　　要：广西大瑶山地区位于钦杭成矿带西南端,以盛产石英脉型金矿闻名,近年来又新发现了一批与花岗岩类有关的斑岩型钨钼铜金矿床,显示良好的找矿前景。在总结矿床地质特征和相关岩浆岩的基础上,结合高精度成岩成矿年龄数据,将大瑶山地区花岗质岩浆岩划分为加里东期（430~470 Ma）、海西—印支期（240~270 Ma）、燕山早期（150~170 Ma）和燕山晚期（90~110 Ma）等4期,并将与花岗岩类有关的矿床划分为加里东期（430~440 Ma）斑岩-夕卡岩-石英脉型钨钼成矿系列、燕山早期（145~155 Ma）斑岩型铜钼（金）成矿系列和燕山晚期（90~110 Ma）斑岩型-蚀变破碎带型钼金银铜铅锌成矿系列等3个成矿系列。提出大瑶山地区加里东期岩浆活动的强度、范围和成矿作用可与燕山期的媲美,具有巨大的找矿潜力,是今后大瑶山地区寻找夕卡岩-斑岩型钨钼铜矿床的主攻方向之一。The quartz vein gold deposits were used to be dominant type of ore deposits in Dayaoshan area of Guangxi, which are located in southwestern of Qin-Hang metallogenie belt. However, a number of newly discovered porphyry-type W-Mo-Cu-Au ore deposits associated with granitoids with huge potential calling for further investigation. We classified the granitoids into four periods on the bases of geological characteristics and precise age of rock formation and mineralization, namely Caledonian period （430 - 470 Ma）, Hercynian- Indosinian period （240 - 270 Ma）, early Yanshanian period （150 - 170 Ma）, and late Yanshanian period （90 - 110 Ma）. The ore deposits related to granitoids can be divided into three metallogenic series, namely Caledonian （430- 440 Ma） porphyry-skarn-quartz vein W-Mo metallogenic series, early Yanshanian （145 - 155 Ma） porphyry Cu-Mo（-Au） metallogenic series and late Yanshanian （90-110 Ma） porphyry-altered fracture Mo-Au-Ag-Cu-Pb-Zn metallogenic series. The Caledonian magmatism in Dayaoshan area may equal the Yanshanian magmatism in intensity, extent and mineralization. Accordingly, we suggest that the future prospection of skarn-porphyry W-Mo-Cu deposits in Dayaoshan area could focus on the Caledonian metallogenic series.

关 键 词：花岗岩类 成矿系列 加里东期 大瑶山 广西 

分 类 号：P588.115[天文地球—岩石学] P588.121[天文地球—地质学]