广东三水盆地西缘横江铅锌矿床的成矿时代及新生代找铜前景  

Ore-forming epoch of Hengjiang Pb-Zn-Cu deposit on western margin of Sanshui basin, Guangdong Province,and its significance in prospecting for Cenozoic copper deposits

作　　者：王登红[1] 陈毓川[2] 李杰维 魏琳 李晓焰 李纯杰[4] 

机构地区：[1]1中国地质科学院矿产资源研究所,北京100037 [2]中国地质科学院,北京100037 [3]广东省地质矿产勘查与开发局757地质队,广东江门529040 [4]中国地质科学院矿产资源研究所,北京100037

出　　处：《矿床地质》2006年第1期10-16,共7页Mineral Deposits

基　　金：中国地质调查局大调查项目"中国成矿体系与区域成矿评价"(K1.4_3_4);"中国成矿体系综合研究"项目;国土资源百人计划项目;科技攻关项目(2003BA612A-01)的资助

摘　　要：近年来，在广东三水盆地及其西缘三洲盆地中，先后发现了长坑大型金矿床和富湾超大型银矿床及横江、茶山等铅锌矿床。为了查明横江铅锌矿床的成矿时代，文章采用了两种不同的方法，在两个不同的实验室内，分别测得该矿床中石英的形成年龄为35Ma（流体包裹体Rb-Sr等时线法）和36-39Ma（^40Ar/^39Ar快中子活化法），两者基本一致。这表明多金属成矿作用发生在渐新世，晚于长坑金矿床和富湾银矿床。最近，在横江铅锌矿床中发现铜的含量也很高。矿石中金属矿物主要是黄铜矿、辉铜矿、闪锌矿和方铅矿。因此，铜矿化的存在与富集，为三水盆地及其周边地区贵金属和有色金属的地质找矿提供了重要的新线索，同时也为在其他盆地区寻找有色金属矿床打开了新的思路。Some new ore deposits, such as the Changkeng large-size gold deposit, the Fuwan superlarge silver deposit, the Hengjiang Pb-Zn-Cu deposit and the Chashan Pb-Zn deposit, were discovered in Sanshui basin and its western marginal area. This paper has reported the ore-forming epoch of the Hengjiang polymetallic deposit. The Rb-Sr isochron age of fluid inclusions hosted within quartz from the ores is 35 Ma, in agreement with its ^40Ar/^39Ar plateau age of 37.39 Ma. This result shows that the Hengjiang polymetallic deposit was formed in the Oligocene period of Cenozoic era, later than the formation of the Changkeng Au deposit and the Fuwan Ag deposit. Recently, high content of copper （up to 18.39% - 19.72% ） was noticed in the chalcopyrite-chalcocite- sphalerite-galena ores from Hengjiang, which corresponds to the formation of native copper and other high Cu ore spots on the western margin of Sanshui basin. This suggests the potential of Sanshui basin and its marginal areas in search for Cenozoic copper deposits.

关 键 词：地质学:成矿时代 新生代 富铜铅锌矿床 找矿前景 广东横江 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]