高硅岩浆岩成因与大陆地壳分异：来自福建云山火山-侵入杂岩与含晶洞高硅花岗岩的证据

高硅花岗岩-流纹岩(SiO2>75wt.%)组合是上地壳的重要组成部分，也是地壳成分演化的终极产物，其成因研究是认识地壳分异演化机制的重要途径。白垩纪火山-侵入杂岩及同期含晶洞花岗岩是华南东南沿海最为典型的岩石组合，然而为何花岗岩的分异程度远高于同期流纹岩仍然有待研究。本申请将以福建北东部云山火山-侵入杂岩及含晶洞高硅花岗岩为代表，将火山-侵入杂岩和含晶洞高硅花岗岩进行对比研究，限定花岗岩和流纹岩的形成时代、源区特征、岩石成因类型及岩浆演化过程，约束火山作用和侵入作用的P-T-XH2O-fO2，建立高硅花岗岩、流纹岩及中性侵入岩间的成因联系，确定高硅岩浆运移、分异演化及熔体抽离机制并识别与其成分互补的堆晶花岗岩，反演火山-侵入杂岩及含晶洞高硅花岗岩形成机制、构造背景及地球动力学过程，进一步揭示大陆中-上地壳成分及结构不均一性形成机制。

High Silica Granites (HSGs) and High Silica Rhyolites (HSRs) are common features of the upper continental crust. The genesis of these rocks provides insight into the mechanism of crustal differentiation and evolution. The coastal area of Fujian is characterized by the Cretaceous volcanic-intrusive complexes and contemporaneous miarolitic HSGs. However, the understanding that the differentiation degree of HSGs is much higher than that of the HSRs remains enigmatic. This application will focus on the Yunshan volcanic-intrusive complex and the miarolitic HSGs in north-eastern Fujian province, and a comparative study between the two major objects will be conducted, so as to constrain their formation ages, source characteristics, genetic types and magmatic evolution processes, and to constrain the P-T-XH2O-fO2 conditions. Accordingly, we will manage to establish the genetic relationship among the intermediate intrusive rocks, HSGs, and rhyolites, to determine high silicic magma migration, differentiation, evolution and the mechanism of melt extraction, to identify its complementary cumulate, to inversion the formation mechanism, tectonic setting and geodynamic processes of volcanic-intrusive complexes and HSGs, and further to reveal their roles and implications in the evolution of the heterogeneity of composition and structure of the continental crust.