超高压变质作用及大陆深俯冲--地球科学前沿述评

目的总结和评述超高压变质及大陆深俯冲作用研究进展。方法文献阅读及专题研究。结果总结分析了超高压变质及大陆深俯冲作用的时空分布、俯冲深度极限、俯冲过程中流体的性状及作用,以及中国西部北秦岭、柴北缘和阿尔金超高压变质岩带的研究现状及特点。结论超高压变质岩石均形成于碰撞造山带中,时代以显生宙为主;大陆俯冲的深度有可能达到200 km以上的地幔深处;超高压变质过程中有流体的参与,但流体的活动局限在很小的范围内。

Ultrahigh pressure metamorphism and continental deep subduction: review on frontiers of geosciences

Aim To review international developments in ultrahigh pressure metamorphism and continental deep subduction in the last two decades. Methods Through references reading and studies on continental deep subduction in western China.Results Summaries were made on the distribution of ultrahigh pressure metamorphic rocks with time and space;the depth limitation of continental deep subduction;the features and the functions of fluid during slab deep subdution;the characteristics and the progresses in ultrahigh pressure metamorphism and continental deep subduction in western China.Conclusion Ultrahigh pressure metamorphism occurred mainly in the Phanerozoic collisional Oregon;the depth of continental subduction may exceed 200 km in the mantle;fluid was present during ultrahigh pressure metamorphism but fluid flow occurred in a channellized way on small scales.