摘要
1988年9月作者曾随同高洪学高级工程师,参观了秦岭群地层剖面。在该剖面上见到了绿色的碳酸盐岩,据介绍其中微量元素的含量与一般的碳酸盐岩有较大的差别。野外期间作者认为这是一种蚀变超基性岩,因此采集了样品,进行室内工作,现将工作结果报道如下。该岩石位于陕西省商县以东何原附近。在露头上岩石呈细粒块状,新鲜面为浅绿色,由于碳酸盐内铁的氧化,风化后呈淡褐黄色。镜下鉴定岩石为片状变晶结构,由碳酸盐(60%)、
Listvenite is found in the Qinling Group.The rock is light green when it is fresh,and it is brown on the weathered surface.It consists of magne- site,serpentine and talc,with a few dolomite and calcite.This rock is enri- ched in Cr (700 ppm),Ni (2000 ppm) and Co (100 ppm),reflecting the characteristics of its ultramafic protolith.Since many gold deposits and gold mineralization are associated with this kind of rock,listvenite of the Qinling Group should be further investigated.
出处
《陕西地质》
1989年第2期91-92,共2页
Geology of Shaanxi
