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本文介绍了蒙古—贝加尔裂谷区的GPS观测结果、贝加尔裂谷形成的岩石圈动力学机制及Amurian板块地壳变形等方面的研究成果.GPS观测资料研究表明:贝加尔裂谷区正以4.5±1.2 mm/a的速率向两侧扩张,但对于扩张的动力源问题还有不同的认识.关于贝加尔裂谷区扩张的动力机制主要有:(1)地幔柱的上升是主要的控制因素,(2)印度板块与欧亚板块的碰撞是主控因素.作者认为贝加尔裂谷的形成是多种动力共同作用的结果,包括了贝加尔裂谷区地幔柱的上涌、印度板块与欧亚板块碰撞的远程效应及太平洋板块向欧亚板块俯冲的远程效应.GPS观测结果在很大程度上支持了Amurian板块的存在,但对板块南部、西南部边界的划分还存在很大的争议.在今后的工作中,需要在Amurian板块内部、蒙古地区、我国的华北、东北地区布设更多的GPS连续观测点,以明确限定Amurian板块的独立性、边界范围及运动特征.
In this paper, the GPS observations of the Mongolia-Baikal rift region, the lithospheric dynamics of the Baikal rift and the crustal deformation of the Amurian plate are reviewed.The results of GPS observations show that the Baikal rift region is at 4.5 ± 1.2 mm / a, but there are different understandings on the problem of expanding power source.The main motivation mechanism about the expansion of Baikal rift area are: (1) The rise of mantle plume is the main control factor, (2 The collision between the Indian plate and the Eurasian plate is the main controlling factor.The author believes that the formation of the Baikal rift is the result of the interaction of various motions, including the upwelling of the mantle plume in the Baikal rift region and the collision of the Indian plate with the Eurasian plate The long-range effect and the remote effect of subduction of the Pacific plate to the Eurasian plate.GPS observations largely support the existence of the Amurian plate, but there is still much controversy over the division of the southern and southwestern boundaries of the plate.In the future work , More GPS continuous observation points need to be deployed within the Amurian Plateau, Mongolia, North China and Northeast China to clearly define the independence of the Amurian Plate, Range of community and sporting characteristics.