Deformation feature of the Asian continent

印度次大陆与亚洲大陆相撞，随后渗透到南亚。构造块体的碰撞和侵彻导致了亚洲大陆的大规模变形。在过去的二十年里，亚洲大陆的构造变形模式引起了广泛的争论。亚洲大陆被认为是一个变形的连续体或刚体的集合。在连续统模型中，由于印度的侵入，亚洲的渗透物质被青藏高原下的地壳增厚和印度两侧地壳的构造旋转所吸收。刚体模型强调主要走滑断层在调节印度和亚洲之间的变形中起着重要作用，并且主要断层之间的区域作为刚性块体移动。近年来，通过利用全新世地质记录和GPS大地测量信息测定亚洲大陆的速度场，验证了这两种模式的相对重要性。另一种评价亚洲大陆内部变形类型的方法是古地磁。在过去的三年里，我们收集了西藏、印度支那和扬子地块的侏罗纪至古近系红砂岩。白垩纪后地壳块体的顺时针旋转发生在从西藏东部到华南到印度支那的广大地区。印度支那地块和思茅地块也存在大规模的东南向位移。扬子、印度支那和思茅地块的古地磁资料为更好地了解亚洲大陆的陆内变形提供了机会。

The Indian subcontinent collided with the Asian continent and subsequently penetrated into southern Asia. Collision and penetration of tectonic blocks resulted in large scale deformation in the Asian continent. The mode of tectonic deformation of the Asian continent has been widely debated during the last two decades. The Asian continent is regarded to behave as either a deforming continuum material or as an assemblage of rigid bodies. In the continuum model, penetrated material in Asia due to intrusion of India is absorbed by crustal thickening beneath the Tibetan plateau and by tectonic rotation of crust along both sides of India. The rigid body model stresses that major strike-slip faults play an important role in accommodating the deformation between India and Asia, and that the regions between the major faults move as rigid blocks. Recently the relative importance of these two modes has been tested through velocity field determination of the Asian continent using Holocene geologic record and geodetic information from GPS data.An alternative method for evaluating the style of deformation within the Asian continent is paleomagnetism. We collected Jurassic to Paleogene redsanstones from Tibet, Indochina and Yangtze blocks during the last three years. Post-Cretaceous clockwise rotation of the crustal blocks was observed over a broad area that extends from eastern Tibet through South China to Indochina in this study. Large-scale southeastward displacement was also suggested for Indochina block and Simao block. Paleomagnetic data from the Yangtze, Indochina and Simao blocks offer an opportunity to better understand the intracontinetnal deformation of the Asian continent.