福建华安地区晚侏罗世南园组火山岩成因及其构造环境探讨

Discussion on the Volcanic Origin and Tectonic Environment of Nanyuan Formation of Late Jurassic in Huaan Area,Fujian Province

通过对华安地区晚侏罗世火山岩岩石组合、岩石地球化学特征的研究,认为晚侏罗世南园组火山岩岩浆主要来源于地壳部分熔融,并有少量地幔物质加入,属于壳幔混源型岩浆;火山岩形成可能与古太平洋板块相对欧亚大陆的俯冲消减有关,属陆缘弧火山岩。

Based on the studies of rock association , petrology and geochemistry of Late Jurassic volcanic rocks in Huaan area, the author think that the magma of Nanyuan Formation vol- canic rocks of Late Jurassic were mainly generated from partial melting of crust, and a small amount of mantle material is added. It is belong to the crust mantle mixed source magma. The forming of volcanic rocks was related to the subducting of the PaleoPacific Plate to the Eurasia Plate, and it is belong to continental margin arc volcanic rocks.