作　　者： ; ; ; ; ; ; (武俊德）;

机构地区： 中国地质大学地球科学与资源学院

出　　处： 《矿物学报》 2014年第3期312-320,共9页

摘　　要： 个旧变玄武岩系中热液型铜锡多金属矿床主要分布于老厂、卡房矿田西部。文章利用40Ar-39Ar同位素测年方法对老卡隐伏花岗岩体的钾长石、老卡矿田"玄武岩型"铜矿的金云母进行年龄测试。结果显示,老卡岩体钾长石的40Ar-39Ar同位素坪年龄为71.6±0.29 Ma;老厂和卡房"玄武岩型"铜矿蚀变矿物金云母坪年龄分别为81.99±0.85 Ma和82.46±0.85 Ma,表明其形成时代皆为晚白垩世。结合区域资料,指出个旧锡-铜多金属矿田经历了较长的岩浆-热液演化时期,"玄武岩型"铜多金属矿床与燕山晚期花岗岩浆活动相关,为晚白垩世软流圈上涌、岩石圈大规模伸展减薄的产物。 Hydrothermal copper-tin polymetallic deposits are distributed in altered basalt stratum mainly in Laochang and the west of Kafang in the Gejiu area, Yunnan Province, China. 40Ar-39Ar isotopic dating was used to study the age of K-feldspar in Laoka granite and phlogopite in the 'basalt-type' copper deposit in the Laoka ore field. The result shows that the K-feldspar of the Laoka rock mass has an 40Ar-39Ar plateau age of 71.6±0.29 Ma; and that the alteration phlogopite in the Laochang and Kafang 'basalt-type' copper deposits have an 40Ar-39Ar plateau age of 81.99±0.85 Ma and 82.46±0.85 Ma respectively, which means that these minerals were formed in the Late Cretaceous. Combined with regional data, this article further indicates that the copper-tin polymetallic ore field in Gejiu has undergone a long magma-hydrothermal evolution and that 'basalt-type' copper polymetallic deposits are the products of asthenospheric upwelling and massive lithospheric extension, associated with the magmatic activity in the Late Yanshanian period.

关 键 词： 个旧老卡 同位素年龄 钾长石 金云母 玄武岩型 铜矿

领　　域： [天文地球] [天文地球]