陕南岚皋辉石玢岩及其形成的大地构造环境

对岚皋地区辉石玢岩岩石化学和地球化学研究表明，本区辉石玢岩为碱性玄武岩系列；不同期次活动的辉石玢岩为同源岩浆在不同阶段上演化的产物；演化趋势属跨越Ｂ型，本区辉石纷岩形成于板内稳定区，是早古生代南秦岭被动大陆边缘裂谷的岩浆活动时的产物，该裂谷扩张速度与东非埃塞俄比亚相近。

Pyroxene Porphyrite Bodies and Their Tectonic Environment in Langao County,Shanxi Province

Based on petrochemical and geochemical studies,the paper comes to the conclusion that the pyroxene porphyrite bodies are an alkalic basalt series,which have generated from the different evolutionary stages of a primary magma,i.e.a B-type striding evolution.The pyroxene porphyrite bodies developed in the intraplate stable area had been created by the activities of rifting magma occurred in the southern Qinling passitve continental margin during early Paleozoic.The spreading rate of the rift valley is estimated to be appoximate to that of Ethiopia in East Africa.