黔桂边境大弄地区透闪石化基性岩的确定及其地质意义

分布在大弄地区岩墙状及岩脉状强透闪石化岩石，过去一直被认为是闪长岩。通过新近的1:5万区域地质调查工作，获得了大量岩石学和岩石地球化学资料，结合其形成的地质背景和产出的地质特征等，我们认为它们是基性岩，而非闪长岩，形成于825Ma左右。这类基性岩的确定，对研究江南造山带西南段新元古代早期Rodinia超大陆裂解有重要的科学意义。

Determination on Tremolitization Basic Rocks in the Dalong Area of the Boundary between Guizhou and Guangxi Provinces and Its Implication

Strong tremolitization rocks in shape of rock walls and rock veins, distributed in the Dalong area, have been viewed as the diorites at all times. Through regional survey at present on a scale of 1:50,000, the data about lithology and petrologic geochemistry were considerably available which suggest in combination with relatively geological setting and feature these are the basic rocks but not the diorites, formed at 825Ma approximately. This type of basic rocks determined is of great geological significance for the studies of Rodinia supercontinent break-up of early Neoproterozoic of the south section of jiangnan orogenic zone.