论文部分内容阅读
岩石学结构和热结构表明大别碰撞造山带是由两个不同岩石—构造单元叠置形成,代表两个深部地壳物质剖面。本文通过对高压、超高压岩石形成过程中岩石物理(密度)性质分析,指出大陆长英质地壳自身在特定岩石学结构情况下可以俯冲至地幔深度。低温、快速折返是缺乏同碰撞和碰撞后花岗岩类的主要原因。“浮沉子效应”是超高压岩石形成和折返的力学机制。
Petrological and thermal structures show that the Dabie collision orogen is formed by the superimposition of two different rock-tectonic units, representing two deep crustal material profiles. Based on the analysis of rock physics (density) during the formation of high pressure and extra-high pressure rocks, the paper points out that the continental crust in the mainland itself can subduct to the depth of the mantle under certain petrological structure. Low temperature, rapid reentry is the main reason for the lack of collisions and post-collision granite classes. The “float-sink effect” is a mechanistic mechanism for the formation and reentry of extra-high pressure rocks.