安徽钱桥-象山角闪石堆晶岩岩石学和地球化学特征

安微钱桥-象山角闪石堆晶岩是由相当于低硅闪长岩中暗色微粒包体的玄武质岩浆在9.24～12.77km深度和高水压条件下结晶分离作用堆晶形成的。残余的低硅闪长质熔体将它们携带到浅部侵位。结晶分离形成这种堆晶岩的岩浆是玄武质的,可能是由地幔岩中等程度部分熔融形成的拉斑玄武质岩石经再次熔融形成的。

GEOCHEMISTRY AND PETROLOGY OF HORNBLENDE CUMULATES IN QIANQIAO AND XIANGSHAN AREAS OF ANHUI PROVINCE

The horblende cumulates in Qianqiao and Xiangshan areas of Anhui Province are one kind of dark inclusions discovered in dioritic rocks in last years, while the dark microgranular inclusions were found in them. The research of petrology, mineralogy and geochemistry of the horbleride cumulates indicates that the cumulates were not crystallized from ultramarie magma, but were formed by the crystallization, fraction and accumulation of basaltic magma. The dark mierogranular inclusions have their components of basaltic magma and low-Si diorite had been formed from the residual magma. Because of high-water pressure, the horblende cumulates where accumulated from this magma and the marginal zone of the basaltic magme was probably duenched to form the residual dioritic magma intruded into the shallow part with the massive horblende cumulates and dark microgranular inclusions, formed all kinds of inclusions in the dioritic intrusion.