西秦岭地区晚中生代OIB型玄武岩的发现及其意义

Geochemistry of Late Mesozoic Mafic Volcanic Rocks in Western Qinling and its Implication

在西秦岭地区发现一套晚中生代玄武岩,其地球化学成分类似O IB的特征,暗示该地区晚中生代岩浆源区来源于软流圈,其起源可能与岩石圈拆沉作用、软流圈地幔上涌和岩石圈伸展减薄有关,这为全面秦岭大别造山带中生代岩石圈演化提供了有利的直接证据。

Late Mesozoic basalts in western Qinling have similar major and trace elemental geochemistry to OIB, indicating an origin of partial melting of asthenosphere. The partil melting of asthenosphere may be the result of lithospheric delamination and extension.