江西北武夷山高家山铜钼矿含矿岩体的特征与锆石U-Pb年代学研究  

Characteristics and Zircon U-Pb Geochronology of Metallogenic Granitoids in the Gaojiashan Cu-Mo Deposits,Northern Wuyishan,Jiangxi Province

作　　者：曹圣华[1,2] 唐峰林[2] 黄新曙[2] 邱文江[2] 袁振国[2] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]江西省地质调查研究院,南昌330030

出　　处：《地质学报》2011年第2期207-212,共6页Acta Geologica Sinica

基　　金：中国地质调查局"全国重要矿产和区域成矿规律研究"(编号1212010733803)和"江西铅山-永平地区矿产资源远景调查"(编号1212010881403)资助的成果

摘　　要：北武夷山地区高家山矽卡岩型铜钼多金属矿床位于扬子地块与华夏地块碰撞对接带萍乡-广丰深大断裂的南侧,前人获得与成矿有关正长斑岩、花岗斑岩体的K-Ar法同位素年龄为63.6Ma、84.7Ma。本文对与成矿有关的正长斑岩和侵入于正长斑岩、花岗斑岩中的闪长玢岩分别进行了精确的锆石U-Pb定年研究,获得锆石206Pb/238U年龄分别为232.7±0.6Ma和219.6±1.5Ma,属印支期。通过分析矿石的氧、硫同位素和成矿岩体的地质地球化学特点,认为高家山铜钼矿床与印支期富碱性岩浆活动存在密切的时空和成因联系。因此,成矿岩体年龄间接地反映了本矿床的形成时代为印支期,提供了北武夷山地区印支期成矿作用的新信息。Gaojiashan copper and molybdenum deposits in the northern Wuyi Shan region,Jiangxi province,is tectonically located on the southern margin of the Pingxiang-Gangfeng fault belt,the collisional suture between Yantze plateform to the north and Huaxia plateform to the south.The K-Ar dating ages by previous studies for orthophyre and granite porphyry related to mineralization are 63.6 Ma and 84.7 Ma,respectively.Precise zircon U-Pb dating was carried out on the orthophyre,and diorite porphyry intruding orthophyre and granite porphyry in the Gaojiashan deposits,and yields the ^206Pb/^238U ages of 232.7±0.6 Ma和219.6±1.5 Ma,suggesting an age of Indo-China epoch.The analysis of geochemical characteristics and stable isotope of δ34S and δ18O in this study indicate that the ore-forming material and fluid of the Gaojiashan Cu-Mo deposit derived from alkali rich magma activity during the Indo-Chinese epoch.Therefore,the age of the U-Pb dating can reflect the ore-forming age indirectly and provide new information on the mineralization in this area during the Indo-Chinese epoch.

关 键 词：锆石U-PB定年 成矿岩体 高家山 北武夷山 

分 类 号：P618.41[天文地球—矿床学] P597.3[天文地球—地质学]