浙江徐家墩鹅湖岭组含铜多金属矿火山岩的地球化学与年代学

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英文篇名：Geochemistry and Geochronology of Copper and Polymetal-Bearing Volcanic Rocks of the Erhuling Formation in Xujiadun,Zhejiang Province 作者：张家菁 ; 施光海 ; 童贵生 ; 张智宇 ; 刘海 ; 吴荣土 ; 陈磊 英文作者：ZHANG Jiajing1 ; 3) ; SHI Guanghai2) ; TONG Guisheng1) ; ZHANG Zhiyu2) ; LIU Hai2) ; WU Rongtu1) ; CHEN Lei2)1)Northeast Jiangxi Geological Party ; Jiangxi Bureau of Geology and Mineral Exploration and Development ; Shangrao ; Jiangxi ; 334000 ; 2)China University of Geosciences ; Beijing ; 100083 ; 3)Graduate School of Chinese Academy of Geological Sciences ; Beijing ; 100037 关键词：鹅湖岭组 ; 流纹质熔结凝灰岩 ; A型花岗岩 ; 浙江江山 英文关键词：Erhuling Formation ; rhyolitic ignimbrite ; SHRIMP zircon dating ; A-type granite ; Zhejiang 刊名：地质学报 英文刊名：Acta Geologica Sinica 出版日期：2009-06-15 出版单位：地质学报 机构：江西省地质矿产勘查开发局赣东北大队;中国地质科学院研究生部;中国地质大学(北京); 年：2009 期：06 基金：江西省地质矿产勘查开发局地质科研项目“北武夷地区铜多金属成矿规律及找矿靶区优选” 基金：“北武夷构造岩浆演化与成矿系列研究”资助成果 CN：11-1951/P ISSN：0001-5717 页：43-51 页数：9 分类号：P618.4 语种：中文; 文件大小：696K

摘要

浙江江山徐家墩鹅湖岭组流纹质熔结凝灰岩的断裂构造中含有铜多金属矿物,然而其形成时代及成因目前尚不清楚。该岩石为浅粉红色,具有流纹构造和斑状结构。其化学成分显示出富硅(SiO2=72.99%~77.56%)、富碱(Na2O+K2O=6.57%~8.61%),低钙、镁(CaO=0.03%~0.05%和MgO=0.01%~0.08%)的特征。稀土配分显示强烈负铕异常(δEu介于0.028~0.038之间)的"海鸥型"特征。岩相学和地球化学特征均显示其为具有A型花岗岩特征的流纹质熔结凝灰岩,推测属板内构造环境。其内锆石SHRIMP的U-Th-Pb测年结果显示该火山岩的形成年龄为138.0±2.4Ma,显示其就位时间为中生代白垩纪燕山运动的中晚期。中生代具有A型花岗岩特征的流纹质熔结凝灰岩的发现有助于建立所在盆地岩浆-构造活动序列及理解该区铜多金属成矿作用和选定找矿靶区。
        Copper-polymetal minerals occur in the cracks of the Erhuling Formation rhyolitic ignimbrite in Xujiadun,Jiangshan District,Zhejiang Province,but the origin and age of rhyolitic ignimbrite are still unclear.Based on the field observation,it is pink in color and of rhyotaxitic and porphyritic structures.It is characterized by enrichments in Si and alkali(SiO2=72.99%~77.56%,Na2O+K2O=6.57%~8.61%)and depletion in Ca and Mg(CaO=0.03%~0.05%,MgO=0.01%~0.08%).REE geochemical analysis shows high negative Eu abnormalities(δEu=0.028~0.038)with a "seagull-shaped" distribution in REE patterns.Petrography and geochemical characteristics indicate that the rhyolitic ignimbrite is of A-type granite,suggesting it formed in an intraplate structural environment.SHRIMP zircon U-Pb dating yields an erupting age of 138.0±2.4 Ma,indicating that the volcanic rocks likely emplaced at the middle-late stage of Yanshanian movement during the Mesozoic Era.Discovery of Cretaceous rhyolite with A-type granite geochemical feature will do help to establish a magmatism-tectonic sequence and understand copper and polymetal mineralization in the Xianxialing Basin.

引文

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