河南省崤山地区中河银多金属矿床花岗斑岩体形成时代及其地质意义  

Zircon U-Pb dating of granite porphyry in Zhonghe silver polymetallic deposit and its geological implication,Xiaoshan area in Henan province

作　　者：曾威[1] 常云真[2] 司马献章 李承东[1] 王家松 孙卫志[2] 张峰 

机构地区：[1]中国地质调查局天津地质调查中心,天津300170 [2]河南省地质矿产勘查开发局第一地质矿产调查院,河南洛阳471023

出　　处：《地质调查与研究》2017年第2期81-88,共8页Geological Survey and Research

基　　金：国家地质调查项目"中条-熊耳山成矿区地质矿产调查(121201006000150003);豫西成矿区资源远景调查评价(1212011120771)";河南省地勘基金项目"河南省崤山东部银钨多金属预查(豫国土资发[2014]75)"

摘　　要：中河银多金属矿是崤山东部浅覆盖区新发现的矿床,经初步勘查银达大型规模。矿体产于中河花岗斑岩体内及其外围的构造蚀变带中。本文对与成矿有关的花岗斑岩进行LA-ICP-MS锆石U-Pb同位素测年,获得其成岩年龄为(130.3±0.9)Ma,为早白垩世构造-岩浆活动的产物。结合区域构造演化、区域成岩成矿时代对比和矿床地质特征,认为中河银多金属矿床形成于早白垩世岩石圈减薄的构造背景,与华北陆块南缘同时期形成的其它金、钼、钨、银、铅锌矿床一起,属于华北陆块南缘早白垩世岩石圈减薄背景下与岩浆活动有关的金钼钨银铅锌矿成矿系列。Absract： Zhonghe silver polymetallic deposit which is a lage scale silver deposit after initial prospecting was newly discovered in shallow overlay area in the east of Xiaoshan.Orebodies occur within Zhonghe granite porphyry and tectono-fracture zone on the periphery of granite porphyry. Porphyry type mineralization and hydrothermal vein type mineralization developed in the deposit which are both closed related to granite porphyry. The authors conducted LA-ICP-MS zircon U-Pb chronology study of the mineralized granite porphyry and obtained ages of 130.3 ~ 0.9 Ma,indicating that the porphyry and deposit are the products of tectonic and magamatic activity in Early Cretaceous. Combined with regional tectonic evolution, time of diagenesis and mineralization as well as geological characteristics of the ores, it is suggested that Zhonghe silver polymetallic deposit formed in the tectonic setting of lithospheric thinning in early Cretaceous.Together with other gold, molybdenum, tungsten, silver and lead-zinc deposits formed in south margin of North China block during the same period, they belong to the Au, Mo （W）, Ag , Pb , Zn minero genetic series related to late Jurassic-early Cretaceous magamatic activity in lithospheric thinning tectonic setting.There is ore-prospecting potential for porphyry-type molybdenum deposit in the deep part of the silver polymetallic deposits. Key words： zircon U-Pb dating; Early Cretaceous; Xiaoshan; south margin of North China block

关 键 词：锆石U-PB测年 早白垩世 崤山 华北陆块南缘 

分 类 号：P618.52[天文地球—矿床学] P597.3[天文地球—地质学]