摘要
钨和锡是大陆地壳背景上形成的华南型块状硫化物矿床的特征元素。该类矿床中钨和锡的高含量往往与基底岩系中这两种元素的初步富集有关,因而反映了大陆地壳的富钨、富锡特征。海底热液、陆源沉积和岩浆热液等地质作用的叠加可使基底岩系中的钨和锡发生活化转移而进入块状硫化物矿床。
Based upon the nature of the crust during ore sedimentation, massive sulphide deposits are classified by Gu Lianxing and Xu Keqin (1986) into three types: the Cyprus type on the oceanic crust, the Kuroko type on the transitional crust and the South China type on the continental crust.
Apart from significant lead, zinc, copper, gold and silver, the South China type deposits often contain noticeable tungsten and tin. In some of these deposits tungsten and tin which are characteristic of the continental crust can be enriched to economic levels. In contrast, deposits of the Cyprus and Kuroko types usually lack significant concentrations of them. Therefore tungsten and tin can be thought of as two characteristic elements of the South China type deposits formed on the continental crust.
The high contents of tungsten and tin in the South China type deposits can be ascribed to the primary enrichment of these elements in the basement rock sequences, and therefore be considered as indications of the tungsten- and tinrich feature of the continental crust.
The continental crust may have supplied the massive sulphide deposits with sedimentary tungsten and tin by means of both terrestrial deposition, and submarine hydrothermal remobi]ization. Being affected by post-sedimentary granitic magmatism, as was often the case on the continental crust, these deposits would obtain additional tungsten and tin which had been extracted and carried up by magmas from crustal rocks at depth.
出处
《地质论评》
CAS
CSCD
北大核心
1990年第4期298-304,共7页
Geological Review
基金
国家自然科学基金
