超高压变质作用研究现状及问题

PROGRESS AND PROBLEMs IN ULTRA-HIGH PRESSURE METAMORPHISM

本文从超高压变质作用的矿物学、Ｐ－Ｔ－ｔ轨迹和超高压地体抬升、保存机制三个方面总结了近年来超高压变质作用研究所取得的重要进展和存在的问题。超高压变质作用的矿物学研究正在向深入发展，其Ｐ－Ｔ－ｔ轨迹具有三种成因类型。而其超高压地体的抬升、保存机制则是争论的焦点，其中增生楔模式（Ｐｌａｔｔ，１９８７）和连续俯冲─仰冲机制较好地解释了抬升过程，但也存在一些问题需进一步研究。

This paper reviews progress and problems of ultra-high pressure metamor-phism on the basis of the mineralogy,P-T-t path and mechanisms of uplift of ultra- highpressure metamorphic terrain,Mineralogical study of ultra-high pressure metamorphismwill be of interest in the future.The diagnostic p- T-t paths of ultra- high pressure meta-morphism are of three types.The uplifting and maintenance mechanisms of ultra- highpressure metamorphic terrain will be a key problem in interpreting the formation of ultra-high pressure metamorphic terrain.The accretionary wedge model postulated by Platt(1987)and the continuous subduction and obduction mechanism verified by Chopin(1987)can explain the uplifting and survival of ultra-high pressure metamorphic terrain,but thisIatter needs further study.