江西上饶梨子坑火山盆地潜火山岩地球化学特征、锆石U-Pb年龄及其与铅锌矿成矿关系  

Geochemical Features,Zircon U-Pb Ages and Relationship to Pb—Zn Mineralization of the Subvolcanic Rocks in Lizikeng Volcanic Basin,Shangrao,Jiangxi

作　　者：徐庆胜[1] 魏英文[1] 黄安杰[1] 罗平[1] 吴才来[2,3] 赵红松 狄永军[4] 

机构地区：[1]江西省地质矿产勘查开发局赣东北大队,江西上饶334000 [2]中国地质科学院地质研究所,北京100037 [3]国土资源部大陆构造与动力学国家重点实验室,北京100037 [4]地质过程与矿产资源国家重点实验室 [5]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《地质论评》2014年第4期932-943,M0003,共13页Geological Review

基　　金：江西省地矿局科研项目(赣地矿字[2010]68号)的成果

摘　　要：本文研究了上饶梨子坑火山盆地分布最广的潜火山岩—花岗斑岩和流纹斑岩岩石学、岩石地球化学、稀土微量元素地球化学特征,并开展了锆石U-Pb定年。结果表明,周家矿区花岗斑岩体年龄为164.6±1.0 Ma,相当于晚侏罗世;蔡家坪和橙树坪矿区流纹斑岩的年龄分别为137.0±2.1 Ma、138.8±1.4 Ma,为早白垩世。结合区内潜火山岩的特征及其与铅锌矿在赋存空间、成矿时代、热液蚀变、物质来源等方面的关系,认为梨子坑火山盆地内的晚侏罗世—早白垩世的花岗斑岩和流纹斑岩是本区铅锌矿最重要的成矿母岩和赋矿岩体,这为本区今后的找矿指明了方向。Studies on petrology,geochemistry and chronology for the granite-and rhyolite-porphyry,that are the most widely distributed in the Lizikeng Volcanic Basin,Shangrao,Jiangxi,carried out in this paper.Zircon U-Pb dating yielded an 165 ± 1Ma for Zhoujia granite-porphyry,137 ±2Ma and 139 ± 1Ma for the rhyolite porphyries of Caijiaping and Chenshouping respectively,equivalent to the Late Jurassic and the Early Cretaceous respectively.Combined with the characteristics of the subvolcanic rocks and the relationship between granite-and rhyoliteporphyry and Pb-Zn mineralization in space,age,hydrothermal alteration and material sources,we suggested that the Late Jurassic-Early Cretaceous granite-and rhyolite-porphyry are the most important metallogenic source rocks and ore-hosting rocks,which indicates the ore-finding direction for the area in future.

关 键 词：花岗斑岩 流纹斑岩 锆石U-Pb定年 铅锌矿化 梨子坑火山盆地 

分 类 号：P588.14[天文地球—岩石学] P597.3[天文地球—地质学] P618.4