大别-苏鲁地区深俯冲陆壳/地幔楔相互作用的熔-流体成份研究

近年来大量的研究表明，大别-苏鲁造山带地幔楔型石榴橄榄岩记录了丰富的壳源熔/流体对地幔楔交代作用的地球化学信息，但对作为交代介质的熔/流体成份、来源以及壳/幔相互作用的方式和机制等方面的认识存在巨大争议。本申请拟以这些岩石为研究对象，通过详细的熔体包裹体和流体包裹体研究来探讨：（1）大陆俯冲带俯冲板片与上覆地幔楔相互作用时熔体的成份和来源；（2）大陆深俯冲过程中各种熔/流体之间的相互关系及演化。相关研究成果将不仅为解决目前存在的争议提供依据，而且对全球大陆俯冲带壳/幔相互作用等一系列有关大陆演化及地球动力学基础性问题的厘定具有重要意义。

Numerous recent studies have shown that，garnet peridotite of mantle wedge from the Dabie-Sulu UHP metamorphic belt have recorded abundant geochemical signatures for metasomatism of crustal melt/fluid to the overlaying mantle wedge and for the recycling of the subducted crustal materials. However, great debate exists with respect to the compositions of the metasomatic melt/fluid and the way of crust/mantle interaction. By a combination of detailed melt/fluid inclusioninvestigations，this project aims to dig out information for: (1) the composition and source of the metasomatic melt/fluid related to the slab/mantle wedge interactions, (2) the relationship and evolution of various types of fluid-melts during the continental deep subduction. The results are expected to provide constraints to not only the solving of the debated issues related to the Dabie-Sulu area, but also to the basic theoriesof continental evolution and geodynamics.