摘要
碧口群铜矿床作为早期同生喷流，后期受变质改造的沉积一变质改造型矿床，其保留有同生沉积的纹层构造和后生叠加改造的脉状构造。脉状硫化物Sr同位素及含矿石英脉的Ar同位素定年分别给出329Ma和211．3Ma，说明脉状硫化物的成矿时限在329－211Ma左右。由于该年龄明显小于矿体围岩的Sin－Nd、Rb－Sr年龄，所以该年龄反映了碧口群矿床的后期叠加成矿的时间。
The copper deposits in the Bikou Group were exhalated to deposit on sealloor in the Proterozoic era and deformed by metamorphic processes later. The deposits with early lamination sedimentary structure and later overprint vein structure are classified into deformed-sedimentary type of ore deposit. Isotopic dating of vein sulfide and ore-bearing quartz show 329 Ma for Rb-Sr and 210 Ma for Ar-Ar, respectively. It indicates that the vein sulfide had generated during from about 329 Ma to 211 Ma. Because the isotope ages are younger than both wall rock Sin-Nd and Rb-Sr, the ages renect the superimposed mineralization time of the Bikou Group copper deposits.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1999年第4期368-372,共5页
Geotectonica et Metallogenia
基金
国土资源部攻关项目!9502002
国家攀登计划资助!95-预-39
