造山带高压、超高压变质岩形成和折返的地球动力学研究─—以中国中部为例

秦岭、大别、苏鲁地区是横亘中国中部的复合型大陆造山带，已成为世界高压、超高压变质岩研究的典型地区，在大陆动力学研究中具重要意义。本文综述了该带高压、超高压变质岩的多样性、多期性、区域分带性和形成折返的四种模式，即碰撞外来岩块模式、俯冲－碰撞－逆冲模式、碰撞－走滑转换－逆冲推覆模式和多期多成因复合模式。并指出高压、超高压变质岩的原岩属性、形成时代、ｐＴｔ轨迹、形成深度和岩浆作用等是深入研究形成和折返机制的关键问题。强调以构造为主的多学科综合研究是解决其地球动力作用过程的有效途径。

STUDY ON GEOOYNAMICS OF FORMATION AND UPLIFT OF HIGH-ULTRAHIGH PRESSURE METAMORPHIC ROCKS IN OROGENIC BELTS───AN EXAMPLE FROM CENTRAL CHINA

he Qinling,Dabie and Sulu regions are a composite continential orogenic belt locat-din central China ,which has become a typical area for studying high-ultrahigh pressure meta-morphic rocks in the world. This paper suggests the diversity, multiple period and regionalzonation of high-ultrahigh pressure metamorphic rocks in this belt and puts forward four mod-els of their formation and uplift, that is foreign block model of collision,subduction- collision-overthrust model, intracontinential-collision-shove transform-thrust nappe model and multi-phase polygenetic combination model. Authors point out that primary rock property,formationage,pTt path,formation depth and magmatism of high-ultrahigh pressure metamorphic rocksare key problems to further study on mechanism of their formation and uplift.It is emphasizedthat comprehensive study led by structural research is an effective way to solve geodynamic process.