论文部分内容阅读
云南个旧锡矿经历了印支期海底基性火山—沉积成矿、海底喷流—沉积成矿和燕山晚期的花岗岩叠加改造成矿的作用。用ArAr、KAr和PbPb法分析了3个成矿系列的成矿年龄,结果表明,成矿系列Ⅰ的ArAr法坪年龄和等时线年龄为95.93±5.41～123.91±15.41Ma,KAr法表观年龄为112.50±2.25Ma,普通铅法年龄为210～240Ma;成矿系列Ⅱ的ArAr法坪年龄和等时线年龄为191.81±2.26～205.11±4.38Ma,KAr法表观年龄为186.01±3.72Ma,普通铅法年龄为200～230Ma;成矿系列Ⅲ的ArAr法坪年龄和等时线年龄为83.23±2.07～85.22±2.38Ma,KAr法表观年龄为43.49±0.87Ma,普通铅法年龄为83～116Ma。
The Gejiu Tin Mine in Yunnan Province has undergone the process of the Indosinian basic seafloor volcanic-sedimentary mineralization, submarine jet-sedimentary metallogenesis and late Yanshanian granite superimposed remodeling and mineralization. The ArAr, KAr and PbPb methods were used to analyze the metallogenic ages of the three metallogenic series. The results show that ArAr plateau and isochron age of metallogenetic series I are 95.93 ± 5.41 ~ 123.91 ± 15.41Ma, With an average age of 112.50 ± 2.25Ma and a normal lead age of 210 ~ 240Ma. The ArAr age and isochron age of the metallogenic series Ⅱ were 191.81 ± 2.26 ~ 205.11 ± 4.38Ma, and KAr was 186.01 ± 3.72Ma , The normal lead age is 200 ~ 230Ma; ArAr law age and isochron age of ore-forming series Ⅲ are 83.23 ± 2.07 ~ 85.22 ± 2.38Ma, KAr is 43.49 ± 0.87Ma, 83 ~ 116Ma.