PETROLOGICAL AND PETROCHEMICAL FEATURES OF SPILITE-QUARTZ-KERATOPHYRE,ZHANGBALING METANORPHIC TERRANE
Guo Kunyi; Wang Ying ping(IGMR. Nanjing, 210016)
Zhangbaling metamorphic terrane is located in the east of Qinling-Dabie orogenic zone,which developed between North China Block and Yangtze Block. Based on reginal geologicalsurvey on the scale of 1: 50000, authors paid great attention to the study of petrological andpetrochemical features of spilite-quartz-keratophyre in Zhangbaling metamorphic terrane, inorder to obtain some information on metamorphism, primitive rock formation and tectonie environment from the spilite-quartz-keratophyre.Main conclusions are as follow:1.Spilite-quartz-keratophyte system in Zhangbaling metamorphic terrane is a suite of basic-acid metamorphic volcanic rocks which erupted from sea floor. Eruption activity is characteristic with the intermittence features. The forming tectonic environment belongs to istand arcand active continental margin.2.The spilite-quartz-keratophyre spotem in Zhangbaling metamorphic terrane was aproduct of Jinning movement. Isotopic age is 927Ma, which indicates that the collision between North China Block and Yangtze Block took place in late-Proterozoic era. The spilitequartz-keratophyre system may extend southwards to Taihe-Suosung region.
【CateGory Index】： P588.3