Abstract
In terms of petrology, thermomechanical simulation is an important frontier to study the geodynamic process of the exhumation and uplift of high pressure (HP) to ultrahigh pressure (UHP) metamorphic rocks in subduction zones and collision orogenic belts. Based on the recent petrological studies and numerical modellings for the exhumation of HP to UHP metamorphic terranes, the exhumation mechanisms of HP to UHP metamorphic terranes can be roughly summarized into ten types: channel flow, diapiric exhumation, a coexistence mechanism of channel flow and diapiric exhumation, slab breakoff, multi-stage exhumation, divergent plate motion (including slab rollback and the upper-plate divergent motion away from the subducted plate), overthrust exhumation, overpressure mechanism, wedge-like extrusion and microplate rotation. The exhumation of high-density UHP oceanic eclogites is a relative controversial issue. Some of our recent researches on quantitatively determining the exhumation mechanism of UHP oceanic eclogites using thermomechanical and phase equilibrium modelling was introduced in details in this paper. We obtained the 3-D density evolutions of three-type subducted oceanic materials (MORB, serpentine and oceanic sediments) in P-T space by the methods of phase equilibrium and density calculation. According to the density difference between the metabasic and their surrounding rocks, the exhumed eclogites could be divided into two types. The first category, the self-exhumation eclogites (ρMORB<ρmantle), which can exhume driven by their own buoyancy, an example is the coesite-bearing oceanic eclogites from Southwest Tianshan. Another is the carried-exhumation eclogites (ρMORB>ρmantle), which can only be carried back to the surface with the assistance of low-density metasediments and serpentinite due to their negative buoyancy; the coesite-bearing UHP eclogites of Zermatt-Saas in the Western Alps is a typical example. Besides, we further explored the ultimate self-exhumation depth, exhumation mechanisms, the effect of the transition from high pressure to ultra-high pressure on the exhumation process of oceanic eclogites and the spatial distribution of exhumed HP-UHP metamorphic terranes.
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Acknowledgements
We are grateful to Professor Yongfei ZHENG and Professor Fuyuan WU for the invitation. We would like to express our gratitude to Professor Zhonghai LI in University of Chinese Academy of Science for his useful discussion and three anonymous reviewers for their constructive comments. Many thanks also go to Dr. Lijuan ZHANG, Huanglu YU, Qingyun LI, Zhanzhan DUAN, Yunxiu LI, and Han HU for their help in the writing process. This study was supported by the National Basic Research Program of China (Grant No. 2015CB856105) and the National Natural Science Foundation of China (Grant Nos. 91755206, 41520104004).
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Zhang, L., Wang, Y. The exhumation of high- and ultrahigh-pressure metamorphic terranes in subduction zone: Questions and discussions. Sci. China Earth Sci. 63, 1884–1903 (2020). https://doi.org/10.1007/s11430-020-9579-3
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DOI: https://doi.org/10.1007/s11430-020-9579-3