朱成生.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[J].地质与勘探,2019,55(1):41-47 |
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 granodiorite porphyry at Dengcaoping in the southern margin of the Hengyang basin and its relationship with mineralization of copper polymetallic ore |
投稿时间:2018-01-26 修订日期:2018-07-31 |
DOI:10.12134/j.dzykt.2019.01.004 |
中文关键词: 衡阳盆地 灯草坪 花岗闪长斑岩 地质特征 铜多金属矿 |
英文关键词: Hengyang basin,Dengcaoping,granodiorite porphyry,geological characteristics,copper polymetallic ore |
基金项目: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)及2017年资助青年地质科技人员项目(编号:QNDZKJ-2017-11)联合资助 |
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中文摘要: |
灯草坪岩体位于衡阳盆地西南缘,出露面积约0.67km2,为燕山晚期花岗闪长斑岩体。文章通过对灯草坪岩体进行了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K2O/Na2O和高Fe2O3/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。 |
英文摘要: |
The Dengcaoping rock mass , the late Yanshan granodiorite porphyry, is located in the southwest margin of the Hengyang basin with an exposed area about 0.67Km2. In this paper, the geochemistry of the main trace elements of this rock mass is studied, and the relationship with the mineralization of the surrounding copper lead zinc deposits is discussed. The analysis shows that the Dengcaoping rock has high (excess) aluminum, high silicon, high K2O/Na2O and high Fe2O3/FeO ratio. It is of 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. Its 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 formed in a post-collision environment, and deep crustal or mantle materials involved in petrogenesis and mineralization. It is inferred that the Mesozoic non-ferrous metallogenic activities in the Hengyang basin continued till the Cretaceous epoch. |
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