花岗岩研究与大陆动力学

STUDIES ON GRANITES AND CONTINENTAL DYNAMICS

花岗岩是大陆地壳的主要物质组成之一 ,蕴含着探索大陆动力学的重要信息。成因研究特别是混合成因研究可以提供探索大陆结构、生长及壳幔相互作用演化的信息 ;花岗岩形成演化揭示了构造动力学演化、大陆动力学演化及壳幔相互作用演化的某些特点 ;岩浆上升、迁移是大陆内部能量传播、物质迁移和调整的一种形式 ;岩浆的聚集及岩体生产方式与大陆块体运动学、动力学密切相关 ;岩体定时、定位对大陆块体时空定位提供了限制条件 ;变形岩体可作为区域应变标志体和时间标志体 ,研究大陆的变形 ,并有助于古老块体早期构造的解析。这些研究涉及到大陆的形成、演化、内部物质再分配、热动力效应和构造变动等动力学等问题 ,是花岗岩研究与大陆动力学研究的结合点。

Granites are one of the major compositions of the continental crust,and they contain important information on continental dynamics.The studies on the genesis,particularly the magma mixing genesis,may provide evidences about the structure and growth of the continental crust and also the interaction between the crust and the mantle.The formation and evolution of granites may reflect some evolution features of tectonic dynamics and continental dynamics;Magma\|ascending and migration are the ways for energy transformation and material redistribution in the crust.Magmatic accumulation and growth patterns of plutons are closely related to the kinematics and dynamics of continental blocks.Emplacement and dating of plutons may constrain the space and dating of blocks.Deformed granitoid plutons may be used as the regional deformation markers to study those continental deformations and to analyse the early deformations of the old continental blocks. All these studies are closely interrelated to the continental dynamics such as the formation,evolution,material redistribution,thermo\|dynamics and tectonic deformation,which may be the linking point between the studies of granites and continental dynamics, and therefore,much attention should be paid to.