Some problems in the study of Mesozoic extensional structure in the North China craton and its significance for the study of lithospheric thinning
Some problems in the study of Mesozoic extensional structure in the North China craton and its significance for the study of lithospheric thinning
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作者：
Tong Ying
本文综述了华北克拉通及其周边地区以变质核杂岩和穹隆为代表的伸展构造研究的进展和存在的问题，提出了一些值得进一步研究的重要课题及其在华北克拉通破坏和岩石圈减薄研究中的意义。以变质核杂岩和穹隆为窗口，开展逆冲向伸展转换机制、区域伸展运动学、剪切应变类型、伸展时间和过程的研究，有利于深入探讨地壳增厚向伸展减薄转换的成因和过程，确定地壳减薄的区域运动学方式和时间，确定伸展变形对地壳和岩石圈减薄的贡献。这些研究将提高华北克拉通伸展构造的研究水平，有助于弄清岩石圈减薄的地壳响应。特别是这些研究将为NCC的破坏和岩石圈减薄的时间、机制、模式和深部动力学研究提供有力的证据。
This paper summarizes the progress and problems in the study of the extensional tectonics represented by metamorphic core complexes and domes in the North China craton (NCC) and its surrounding areas and suggests some important subjects that merit further study and their significance in the study of the destruction and lithospheric thinning of the NCC. Carrying out studies of the mechanism of transition from thrusting to extension, regional extensional kinematics, shear strain types, timing and process of extension by taking metamorphic core complexes and domes as the window is conducive to probing into the origin and process of the transition from crustal thickening to extensional thinning intensively, determining the regional kinematic manner and timing of crustal thinning and ascertaining the contribution of extensional deformation to crustal and lithospheric thinning. These studies will improve the level of research on the extensional tectonics of the NCC and help to make clear the crustal response to the lithospheric thinning. Particularly, these studies will provide strong evidence for the study of the timing, mechanism, model and deep dynamics of destruction and lithospheric thinning of the NCC.