摘要
所研究的毒砂形成两个成矿阶段。成矿前阶段的毒砂具有颗粒粒大、裂隙发育和明显的成分环带等特征。成矿前的裂隙为金的迁移和沉淀提供了良好的空间。成矿期阶段的毒砂颗粒细小,无成分环带。根据形态、分布规律和成分特点,成矿期毒砂可划分为两个世代:早期的,自形程度高,无明显成分异常;晚期的,他形晶,含砷低。毒砂的特性反映了金的成矿作用的演变过程。
Arsenopyrites from the Qiqiu gold deposit have been examined, suggestingthat they formed in two hydrothermal events. The pre-mineralization arsenop-yrite is coarse-grained, with obvious compositional zoning and microfracturesfavouring the transport and precipitation of gold, while the syn-mineralizationarsenopyrite is fine-grained, without compositional zoning. The micromorpho-logy, occurrence and composition of the arsenopyrites indicate that the latterarsenopyrite could be further divided into two generations: the early one ismostly euhedral while the late one is xenomorphic and lower in As, Thefeatures reflect the evolution trend of the gold deposit.
出处
《矿物学报》
CAS
CSCD
北大核心
1993年第3期277-281,共5页
Acta Mineralogica Sinica
关键词
毒砂
金
矿床
成矿作用
新疆
arsenopyrite
native gold
Au-deposit
minerogenesis
Xinjiang
