中国地质2012，Vol.39Issue(2)：458-473,16.
南泥湖一三道庄钼(钨)矿的成岩成矿年龄新数据及其地质意义
New geochronological data of granites and ores from the NannihuSandaozhuang Mo(W) deposit
摘要
Abstract
The Nannihu-Sandaozhuang molybdenum deposit is the largest porphyry-skam type deposit in eastern Qinling region. This paper reports new LA-ICP-MS zircon U-Pb age data of granitoids (including granitic veins) and ICP-MS molybdenite Re-Os isotopic age data of the samples from the mining area. The obtained formation ages of granitoids are 145.2±1.5 ~ 146.7±1.2Ma, and the model ages of 5 molybdenite samples from stockwork in the Nannihu mining area and 5 molybdenite samples from disseminated skarn in the Sandaozhuang mining area are 143.4±2.0 ~ 146.5±2.3Ma with isochron age of 146.0±l.lMa. These new geochronological data show explicitly that the granitoids and ores were formed simultaneously, suggesting their genetic relationship. Furthermore, these new data have confirmed the existence of magma-thermal event at about 158Ma revealed by previous dating work, and also for the first time revealed that the eastern Qinling area once underwent another magma-thermal event at about 175Ma. The published weighted average age data are of distinct deviation from the real intrusive age of the Nannihu magmatic body, which results from 1) nonhomogeneous origin of zircons in magmatic rock and 2) unrepresentative dating of zircon group.关键词
东秦岭/华北地台南缘/南泥湖/三道庄/锆石U-Pb年龄/Re-Os年龄Key words
eastern Qinling/southern margin of the North China Craton/Nannihu/Sandaozhuang/ zircon U-Pb age/Re-Os age分类
天文与地球科学引用本文复制引用
向君峰,毛景文,裴荣富,叶会寿,王春毅,田志恒,王浩琳..南泥湖一三道庄钼(钨)矿的成岩成矿年龄新数据及其地质意义[J].中国地质,2012,39(2):458-473,16.基金项目
中央级公益性科研院所基本科研业务费专项资金(K1018)、南京大学内生金属矿床成矿机制研究国家重点实验室基金项目(15-09-01)、全国危机矿山接替资源找矿项目(20089949和200841019)、国土资源部公益性行业科研专项课题(200911007-08)和国家科技支撑计划项目课题(2010BAB04B06)联合资助 （K1018）
