江西岿美山钨矿矿床的成矿年龄及地质特征

江西省定南县岿美山钨矿区位于南岭东西向构造带东段与武夷山北东-北北东向构造带南段的复合部位，是赣南地区以石英脉型黑钨矿和矽卡岩型白钨矿共生为特征的钨矿床，其是否为南岭地区燕山期的成矿作用，一直没有精确的年代学研究成果。本文采用锆石SHRIMP U-Pb定年和辉钼矿Re-Os同位素定年技术，对岩体年龄和成矿年龄进行了精细的测定，获得成矿黑云母花岗岩体的锆石SHRIMP U-Pb年龄为（157.7±2.7） Ma（n=11，MSWD=1.9），黑钨矿石英脉的辉钼矿Re-Os等时线年龄为（153.7±1.5） Ma（n=5，MSWD=0.16），显示岿美山区是华南地区中生代钨矿大规模成岩成矿作用的产物之一。根据“五层楼+地下室”的找矿模型，并结合矿区的最新找矿线索，研究认为在矿区深部岩体的内外接触带具有存在新矿体的可能性，该区深部具有较大的找矿潜力，同时探索性地提出赣南地区石英脉型钨矿深边部存在矽卡岩型钨矿化的可能，对区域钨矿的深边部找矿工作具有指导意义。

Metallogenic Epoch and Geological Characteristics of the Kuimeishan Tungsten Deposit,Jiangxi Province

The Kuimeishan tungsten deposit is located in the junction area of the eastern segment of the E-W-trending Nanling tectonic zone and southern segment of the NE-NNE trending Wuyishan tectonic zone. It is characterized by intergrowth of quartz vein-type wolframite and skarn-type scheelite in Dingnan county, south of Jiangxi province (Gannan). However, there is no accurate chronological evidence to confirm whether the metallogenesis occured in the Yanshanian period. The SHRIMP U-Pb age of zircons obtained from the metallogenic biotite granite is (157.7±2.7) Ma (n=11, MSWD=1.9), and the Re-Os isochron age of molybdenite from the ore-bearing quartz veins is (153.7±1.5) Ma (n=5, MSWD=0.16). The accurate metallogenic and diagenetic chronology results indicate that the Kuimeishan tungsten deposit was formed during the large-scale diagenesis and mineralization of tungsten ore in the Mesozoic period that occurred in South China. Based on the 'five levels+basement' prospecting model and the latest prospecting clues, it is possible that new ore bodies are amassed in the contact zone of deep rock body in Kuimeishan, which has great potential for prospecting. It is significant to the deep and periphery prospecting for tungsten as we proposed the possibility of skarn type tungsten which occurred nearby the deep and periphery part of quartz vein type tungsten in the Gannan region.