中生代高镁闪长岩中辉石岩捕虏体的成因：对岩石圈地幔深部过程的制约

The petrographic, mineralogical and whole rock geochemical data for the pyroxenite xenoliths from the Early Cretaceous high-Mg# diorites at Tietonggou and Jinling in western Shandong Province, eastern part of the North China Craton (NCC), with the aim of determining their petrogenesis. The nature and origin of the melts modifying the lithospheric mantle are discussed by the petrography, mineralogy and isotopic geochemistry (mainly the oxygen isotopic compositions of olivine and strontium isotopic compositions of clinopyroxene), melt inclusion for the selected pyroxenite xenoliths with a suggested genesis of melt-peridotite reaction. Together with the previous research, the deep processes and mechanism of the destruction of the eastern NCC during the Mesozoic are finally constraint on the petrographic, mineralogical and whole rock geochemical.

通过对华北克拉通东部鲁西地区早白垩世铁铜沟和金岭高镁闪长岩中的辉石岩类捕虏体进行详细的岩相学、矿物地球化学和全岩地球化学研究，查明辉石岩类捕虏体的岩石成因。在确定了辉石岩类捕虏体成因的基础上，选取熔体-橄榄岩反应成因的辉石岩捕虏体，利用捕虏体的岩相学、矿物原位微区痕量元素及其同位素组成(主要是橄榄石的氧同位素以及单斜辉石的锶同位素)、熔体包裹体等信息确定改造岩石圈地幔熔体的性质及其来源。同时结合前人的研究成果，最终为解决华北克拉通东部中生代岩石圈地幔被改造的过程与机制等科学问题提供详尽的岩石学、矿物学以及地球化学证据。

本项目对华北克拉通东部鲁西地区早白垩世铁铜沟和金岭高镁闪长岩中的辉石岩类捕虏体进行详细的岩相学和矿物地球化学，查明了辉石岩类捕虏体的岩石成因。选取熔体-橄榄岩反应成因的辉石岩捕虏体，利用捕虏体的岩相学、矿物原位微区痕量元素及其同位素组成等信息确定改造岩石圈地幔熔体的性质为富硅熔体，来源为再循环陆壳物质。华北克拉通东部岩石圈地幔被改造的机制为起源于再循环陆壳物质的熔体与地幔橄榄岩的反应。