桂北雪峰期含锡黑云母花岗岩成因的见证

作者对桂北地区进行了野外地质工作，重点观察和研究了雪峰期含锡黑云母花岗岩和四堡群变质岩的产状和特征，并采集了它们的标本，进行了系统的岩矿鉴定、人工重砂分析和岩石化学成分对比，从宏观到微观总结出四堡群中、下部的变质岩与雪峰期的含锡黑云母花岗岩有成因关系的１０个方面的证据，并被高温高压成岩实验所证实。这些证据和分析方法对于研究华南古老变质岩地区的同类花岗岩有其重要意义。

Genetic Evidence for the Xuefengian Sn-bearing Biotite Granite in North Guangxi

The authors carried out field geological works in the northern Guangxi region,with a specialstress on inestigating and studying the characteristics such as the attitudes and compositions of the Xue-fengian Sn-bearing biotite granite and the metamorphic rocks of the Sibao Group.And then,theymade systematic petro-mineralogical determinations,artificial heavy fraction analysis and comparativestudy of chemical composition of both the rocks.As a reslt ten lines of macroscopic and microscopic evidences have been summarized ,indicating a genetic relation between the Xuefengian Sn-bearing bi-otite granite and the metamorphic rocks in the middle and lower parts of the Sibao Group,which hasnow been verified by the experimental study of the mechanism for the formation of the Sn-bearing bi-otite granite.Therefore,these lines of evidence and analytical methods are of important significance tothe study of the granites of the same stage in the old metamorphic terranes of South China.