中甸矿集区普朗-红山铜多金属成矿亚带北段帕纳牛场斑岩体^(40)Ar—^(39)Ar年龄及锑矿化

^(40)Ar—^(39)Ar Ages and Antimony Mineralization of the Pananniuchang Porphyry in the Zhongdian Area of Yunnan Province

普朗-红山铜多金属成矿亚带北部帕纳牛场辉锑矿床与石英二长斑岩(热液)及断裂有关。斑岩黑云母40Ar-39Ar坪年龄和等时线年龄分别为199.1±1.3Ma和199.2±2.4Ma,代表了与辉锑矿化对应的斑岩的侵位时间,是该成矿亚带上目前获得石英二长斑岩中40Ar-39Ar最年轻的新年龄值,代表了义敦岛弧普朗-红山铜多金属成矿亚带存在燕山早期的构造-岩浆活动。在印支晚期主要形成斑岩型-夕卡岩型铜多金属矿床之外,燕山早期还具有斑岩及至少与斑岩有关的热液脉状成矿作用-锑矿化,预示了本区斑岩的一种新的成矿作用和找矿方向与前景。

The stibnite deposit at the Panan cattle farm in the north of Pulang-Hongshan copper polymetallic metallogenic sub-belt is associated with beschtauite（hydrothermal）and faults.The 40Ar-39Ar plateau age and isochron age of the blackmica in porphyry are 199.1±1.3Ma and 199.2±2.4Ma,which represent the emplacement time of porphyry corresponding to stibnite metallization.These ages are the youngest ones of 40↑Ar-39↑Ar of beschtauite in the Pulang-Hongshan copper polymetallic metallogenic sub-belt,which indicate that in this sub-belt of the Yidun arc existed early Yanshanian tectono-magmatic activities.In late Indo-China epoch,porphyry-skarn copper polymetallic deposit formed in this area,moreover in early Yanshaniann time there was also porphyry deposit formed,as well as hydrothermal vein mineralization related with porphyry.They indicate a new metallogenesis of porphyry,exploration direction and prospect in this region.