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首页> 外文期刊>Journal of Asian earth sciences >Timing and mechanism of formation and exhumation of the Northern Qaidam ultrahigh-pressure metamorphic belt
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Timing and mechanism of formation and exhumation of the Northern Qaidam ultrahigh-pressure metamorphic belt

机译：柴达木北部超高压变质带的形成时期和发掘机制

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摘要

The Qilian Caledonian orogenic belt on the north margin of the Qinghai-Tibet Plateau were formed by convergence and collision of the Alxa terrain, Qilian terrain and Qaidam terrain. The 350-km-long, WNW-ESE-trending North Qaidam ultrahigh-pressure (UHP) metamorphic belt, lying between the Qilian and Qaidam terrains, was formed between 495 and 440 Ma by deep subduction of the South Qilian Sea and the Qaidam continental crust beneath the Qilian terrain. The UHP belt was exhumed by a process of 'oblique extrusion' during transformation from 'normal' to 'oblique' intracontinental subduction between the Qilian and Qaidam terrains. Exhumation began at 470-460 Ma and was completed by 406-400 Ma. Exhumation structures are well-preserved in the UHP rocks and record extensive retrograde metamorphism.
机译：青藏高原北缘的祁连古苏格兰造山带是由阿拉善地区，祁连地区和柴达木地区的汇聚和碰撞形成的。北祁连超高压变质带长350公里，位于祁连和柴达姆地形之间，是在南祁连海和柴达木大陆的深冲作用下于495Ma至440Ma之间形成的。祁连山地形下的地壳。在祁连和柴达木地形从“正常”向“倾斜”的陆内俯冲转变过程中，通过“斜向挤压”的过程挖掘出了UHP带。掘尸始于470-460 Ma，完成于406-400 Ma。 UHP岩石中的掘尸结构保存完好，并记录了广泛的逆行变质作用。

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