摘要
安徽铜陵大团山铜矿床位于长江中下游铁铜成矿带中段,前人根据与成矿有关中酸性侵入岩的时代推测其形成于燕山期.本文运用Re-Os同位素测年方法对大团山铜矿床层状矽卡岩型矿体中的辉钼矿进行了精确年龄测定,获得等时线年龄139.1±2.7Ma,模式年龄变化在138.0～140.8Ma之间.这组年龄数据和与成矿有关中酸性侵入岩的40Ar/39Ar同位素年龄135.8～139.8Ma相吻合.作为中国东部中生代大规模成矿作用的产物,大团山铜矿床及铜陵地区铜硫(金)矿床的形成与岩石圈构造体制大转换之地球动力学事件相耦合.
The Datuanshan copper deposit in Tongling, Anhui Province, is located in the middle section of the Middle and Lower Yangtze Valley iron-copper metallogenic belt. The metallogenic epoch of the deposit was previously regarded as Yanshanian on the ba-sis of the ages of intermediate-acid intrusive rocks related to the ore-forming process. The authors collected 6 molybdenite samples from stratiform skarn orebodies in the Datuanshan copper deposit for Re-Os precise dating. The isochron age is 139.1 ± 2.7 Ma, and the Re-Os model ages vary from 138.0- 140.8 Ma. These age data are concordant with ^40Ar/^39Ar ages, 135.8- 139.8 Ma, of the ore-forming intermediate-acid intrusive rocks. The Datuanshan copper deposit and the copper-sulfur-gold deposits in Tongling area are products of Mesozoic large-scale metallogenic process in East China, coupling with the geodynamic event of the lithospheric tectonic regime transition.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2005年第4期327-331,共5页
Acta Geoscientica Sinica
基金
国家重点基础研究发展规划项目(编号:G1999043211)
国土资源部专项研究计划项目(编号:20010103)
中国地质调查局地质调查项目(编号:K1.4-3-3)共同资助。
