摘要
中生代中国东部是否存在一个高原是一个有争议的问题。从岩石学角度对高原的问题作了一些探讨。根据埃达克岩和喜马拉雅型花岗岩的时空分布厘定了高原的界线,认为存在一个高原而非山脉。高原存留的时间大致为175～113Ma(中侏罗世—早白垩世),主要发育在165～125Ma期间。高原的崛起是从北向南扩展的,并将高原的演化分为萌生期、初期、成熟期、萎缩期、垮塌期、残留期和余脉7个阶段,探讨了不同阶段高原界线的变迁。讨论了与中国东部高原有关的下地壳拆沉、燕山运动的本质、中生代构造大转折的含义及其与古太平洋板块的关系等学术界关注的重大问题,并指出了高原研究中目前存在的问题、争论的焦点和今后研究的方向。建议开展高原古地理学、古环境学、古生态学、古生物学、古气候学等方面的研究,把中国东部高原的研究与青藏高原的研究结合起来,开展对大陆构造理论的创新性研究,企望在新的领域创出新的成果。
Whether there was a plateau in eastern Chin＇a during the Mesozoic is a problem. The authors discuss the problem in the petrological context. They defined the plateau boundary according to the temporal-spatial distribution of adakites and Himalayan-type granites and think that there existed a plateau rather than a mountain range. The plateau had remained from 175 to 113 Ma （from the Mid Jurassic to Early Cretaceous） and mainly developed from 165 to 125 Ma. The plateau extended from north to south and its evolution may be divided into the embryonic stage, initial stage, mature stage, shrinking stage, residual state and remaining stage. The paper discusses the shift of the plateau boundary in different stages. In addition, it also discusses the major issues related to the Eastern China Plateau such as the delamination of lower crust, nature of the Yanshan movement and connotation of major transition of the Mesozoic tectonic regime and its relation to the Paleo-Pacific plate, to which the academic community has paid attention and points out the existing problems, dispute focus and future study direction in the current plateau study. The authors suggest that paleogeo- graphical, paleo-environmentological, paleoecological, paleontological and paleoclimatological studies should be carried out and that the study of the Mesozoic eastern China Plateau should be combined with the study of Cenozoic Qinghai-Tibet Plateau to conduct an innovative study of the theory of continental tectonics.
出处
《地质通报》
CAS
CSCD
北大核心
2008年第9期1404-1430,共27页
Geological Bulletin of China
基金
国家自然科学基金重大研究计划项目(编号:90714011)资助。
