衡阳盆地南缘灯草坪花岗闪长斑岩地质特征及其与铜多金属矿成矿的关系  

Geological Characteristics of the Dengcaoping Granodiorite Porphyry in the Southern Margin of the Hengyang Basin and Its Relationship with the Mineralization of Copper Polymetallic Ore

作　　者：朱成生 覃金宁 吕宇明 ZHU Chengsheng;QIN Jinning;LüYuming(306 Brigade of Hunan Nuclear Ceology,Hengyang,Hunan 421008)

机构地区：[1]湖南省核工业地质局三○六大队,湖南衡阳421008

出　　处：《地质与勘探》2019年第1期41-47,共7页Geology and Exploration

基　　金：湖南省核工业地质局"衡阳盆地铜铀多金属成矿潜力及找矿方向研究"项目(编号:KY-2016-306-01);2017年资助青年地质科技人员项目(编号:QNDZKJ-2017-11)联合资助

摘　　要：灯草坪岩体位于衡阳盆地西南缘,出露面积约0. 67km^2,为燕山晚期花岗闪长斑岩体。文章通过对灯草坪岩体进行主微量元素地球化学研究,讨论了其与周边铜铅锌矿床成矿的关系。分析显示灯草坪岩体具有高(过)铝、高硅、高K_2O/Na_2O和高Fe_2O_3/FeO比值,为镁质、高钾钙碱性岩系,W、Bi、Ag、As、Sb等元素丰度较高,ΣREE值总量中等,轻稀土较富集,δEu值接近1,为铕正常型,δCe值0. 84,具铈的弱的负异常。其岩石学、元素地球化学特征反映岩体形成于碰撞后环境,深部地壳或地幔物质参与了成岩-成矿作用,表明衡阳盆地中生代有色金属成矿活动一直持续至白垩纪。The Dengcaoping rock mass,the late Yanshan granodiorite porphyry,is located in the southwest margin of the Hengyang basin,with exposed area of about 0. 67 km2. In this paper,the geochemistry of the main trace elements in the Dengcaoping rock mass was studied,and the relationship with the mineralization of the surrounding copper lead zinc deposits was discussed. The analysis shows that the Dengcaoping rock mass has high( excess) aluminum,high silicon,high K2O/Na2O and high Fe2O3/FeO ratio. It is a magnesian and high potassium calc alkaline rock series. It is rich in W,Bi,Ag,As,Sb and other elements. The total rare earth element contents are medium with enriched light REE. The δEu is close to 1,which is the normal type of europium. The δCe is 0. 84,indicating a weak negative anomaly of cerium. Its petrological and geochemical characteristics indicate that the rock mass was formed in the post collisional environment,and that deep crustal or mantle materials involved in petrogenesis and mineralization. The Mesozoic non-ferrous metallogenic activities in the Hengyang basin are inferred to last until the Cretaceous period.

关 键 词：衡阳盆地 灯草坪 花岗闪长斑岩 地质特征 铜多金属矿 

分 类 号：P618.2[天文地球—矿床学] P588.12[天文地球—地质学]