摘要
耀岭河群火山岩为一套海底喷溢的细碧角斑岩,依据对其地质学、岩相学及主元素和微量元素地球化学特征的研究,认为它们为岩浆成因,在震旦纪晚期形成于扬子地合北缘的断陷盆地中。
The volcanic rocks of Yaolinghe Group, Sinian located in Shanxi and Hubeiprovinces belong to spilite-keratophyre series. The chemical composition or sequence fromspilites to quartz-keratophyres show regular changes as follows. The main elements(Fe_2O_3+FeO), Mgo successively decrease and (Na_2O+K_2O) increase; the total contens oftrasitional metals guadualy increase, while the total contents of REE gradualy decrease. The author refers the spilite-keratophyre scries in Yaolinghe Group to magmaticorigin. The characteristies of albites show that it was formed before regional metamorphismand crystalized from magma. Yaolinghe Group developed in depression basins which were located in northern conti-nental margin of Yangtse Fault Block at the late-Sinian period.
关键词
耀岭河群
火山岩
岩浆
成因
Yaolinghe Group
spilite-keratophyre series
magmatic origin
depression basin
