赣北香炉山白钨矿床的同位素年代学研究及其地质意义  

Isochronology Study on the Xianglushan Scheelite Deposit in North Jiangxi Province and Its Geological Significance

作　　者：张家菁[1] 梅玉萍[2] 王登红[3] 李华芹[2] 

机构地区：[1]中国地质科学院研究生院 [2]宜昌地质矿产研究所,湖北宜昌443003 [3]中国地质科学院矿产资源研究所,北京100037

出　　处：《地质学报》2008年第7期927-931,共5页Acta Geologica Sinica

基　　金：国家科技支撑计划"南岭地区有色-贵重金属综合勘查技术研究"课题(编号2006BAB01B03);中国地质大调查"我国重要矿产和区域成矿规律研究"项目(编号1212010633903);"中国成矿体系综合研究"项目(编号1212010634002)资助的成果

摘　　要：赣南钨矿闻名世界,但赣北—皖南也存在钨的矿集区,香炉山就是其中之一。该矿床属矽卡岩型层状白钨矿床,与赣南钨矿明显不同。本文通过对矿区内与成矿作用关系密切的花岗岩、白钨矿及其共生的石英矿物的年代学研究,分别获得黑云母花岗岩全岩Rb-Sr等时线年龄为126.2±2.6Ma(95%可信度)、白钨矿Sm-Nd等时线年龄和石英矿物Rb-Sr等时线年龄为121±11Ma(95%可信度)和128±3Ma(95%可信度)。上述测定结果表明,其成矿时代与区内花岗岩岩浆侵位所发生的时间有明显的耦合关系,与区域上同时代形成的斑岩型锡矿(如岩背)及铌钽矿相似,均属燕山晚期岩浆活动的产物。Ganbei-Wannan area （north Jiangxi province and south Anhui province） is another important tungsten deposit -intensive areas besides the Gannan area （south Jiangxi province）. The Xianglushan scheelite deposit is one of the deposits in the Ganbei area. This deposit belongs to bedded skarn-related scheelite deposit, which distinguishes from the tungsten deposits in Gannan. This article presents the isochronology study on the mineralization-related granite, scheelite and quartz. The dating results show that the Rb-Sr whole-rock isochron age of the biotite granite is 126. 2 ± 2. 6 Ma with a 95% reliability, the Sm-Nd isochron age of scheelite is 121±11 Ma with a 95% reliability, and the Rb-Sr isochron age of quartz is 128 ±3 Ma with a 95% reliability. These data suggest that the mineralization epoch is coupled with the emplacement of the granite magma in this area. This kind of scheelite deposits is the products of the late Yannan magmatic activity, together with porphyry tin deposits and associated niobium-tantalum deposits in this area at the same epoch.

关 键 词：香炉山白钨矿 同位素年代学 赣北 

分 类 号：P597.3[天文地球—地球化学]