金平地区二叠纪玄武岩地球化学特征

Geochemistry of Permian Flood Basalts in Jinping Area

金平地区二叠纪玄武岩分布于扬子克拉通西南缘哀牢山深大断裂南西侧.通过对金平地区东南部出露最全的金平县城至那发剖面二叠纪玄武岩岩石化学特征、微量元素及稀土元素特征等方面的研究,初步认为,金平地区玄武岩兼具洋中脊及大陆裂谷碱性-拉斑玄武岩特征,但总体上仍属大陆板内与地幔热柱成因有关的玄武岩.

The flood basalts in Jinping area are distributed along the SW side of Ailaoshan deep - situated structure zone which is located in the southwest margin of Yangtze craton. On the basis of primary study focused on the petrochemical characteristics of flood basalts, the trace elements and REE data of flood basalts, it is preliminarily concluded that flood basalts in Jinping area are related to mantle plume, although they have both the alkali and calc -alkali basalts of middle ocean ridge and continental rift.