摘要
云南个旧是全球最大的锡铜多金属矿区,包括马拉格、松树脚、高松、老厂和卡房五大矿田。卡房铜矿主要的矿床类型有两类:玄武岩层与大理岩层间的似层状矿床和花岗岩与围岩的接触带型矿床。以矿区内玄武岩型铜矿床为主要研究对象,对矿化玄武岩进行同位素K-Ar定年。热史信息揭示矿区内存在一期66～68 Ma的成矿作用,表明玄武岩的冷却时间与其喷发期次和顶板高程具有极高的一致性。
Gejiu,in Yunnan province is one of the largest tin-copper polymetallic mining areas in the world including such five big mine fields as Malage,Songshujiao,Gaosong,Laochang and Kafang.There are two kinds of ore deposits in Kafang copper mine,one is the stratoid deposit between basalt and Dali strata and the other is the contact-zone-type deposit of basalt and its surrounding strata.In this paper,we selected the Kafang and Laochang basalt-type copper deposits as the main study object to determine the ages of mineralized basalts by using the isotope K-Ar dating method.The information of the thermal history revealed that a mineralization period about 66~68 Ma probably exists in the study area and showed that the cooling time of basalt was of excellent consistency with its eruption period times and the roof elevation.
出处
《山东科技大学学报（自然科学版）》
CAS
2012年第3期32-39,共8页
Journal of Shandong University of Science and Technology(Natural Science)
基金
国家自然科学基金项目(40930419)
中国地质调查局地质调查项目(1212011120994)
关键词
玄武岩型铜矿
K-AR法
热演化史
个旧锡多金属矿区
basalt-type copper deposit
K-Ar dating method
thermal evolutional history
Gejiu tin polymetallic mining area
