摘要
江西省崇义县淘锡坑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，属于以石英脉型黑钨矿为主的钨多金属矿床。矿床形成与燕山期中酸性岩浆作用有密切关系，石英矿脉受北西向断裂控制，穿切新元古代地层。文章选取钻孔揭露的底部新鲜花岗岩样品2件，用SHRIMP方法测定锆石的结晶年龄，结果分别为（158．7±3．9）Ma和（157．6±3．5）Ma；对3件含黑钨矿石英脉样品中石英的流体包裹体进行了Rb-Sr等时线年龄测定，结果分别为（154±4）Ma、（157±3）Ma和（161±4）Ma。与前人用Re-Os法测定的辉钼矿（154Ma）比较，发现花岗岩的成岩年龄与含矿石英脉、钨矿的形成年龄相同，成岩、成矿作用几乎同时完成。综合前人研究资料，认为南岭地区160150Ma成岩成矿作用主要分布于南岭中东段，可能与岩石圈大规模伸展的构造动力学背景有关。
The Taoxikeng tungsten deposit in central Nanling region of South China consists of vein-type ore bodies hosted in Cambrian to Jurassic strata and is closely related to Mesozoic granitic intrusions. Wolframite is the dominant ore mineral intergrown with such gangue minerals as quartz, feldspar, phlogopite and muscovite. The authors conducted zircon SHRIMP and quartz Rb-Sr dating for the purpose of better understanding the timing and genesis of the mineralization. Zircon SHRIMP dating of two granite samples yielded ages of （158.7 ± 3.9） Ma and （157.6 ± 3.5） Ma. Rb-Sr analyses gave a well-defined ^87Rb/^86Sr isochron with ages of （154 ± 4） Ma, （157 ± 3） Ma and （161 ± 4） Ma. Compared with known molybdenite Re-Os dating （154 Ma）, it is found that the granite and the mineralization were formed at the same time. These new data, combined with available geochronological data from other major deposits in NaMing region, suggest that large-scale W, Sn, Mo, Bi, Nb, Ta, Pb, Zn mineralization took place throughout central and eastern Nanling region at 160- 150 Ma, suggesting a geodynamic setting of crustal extension during the Middle-Late Jurassic transformation of tectonic regimes.
出处
《矿床地质》
CAS
CSCD
北大核心
2007年第4期432-442,共11页
Mineral Deposits
基金
国家科技支撑计划"南岭地区有色-贵重金属成矿潜力及综合探测技术示范研究"课题
中国地质调查局"中国成矿体系综合研究"项目
"我国重要矿产和区域成矿规律研究"项目
国家重点基础研究发展计划课题(2007CB411407)资助
