Abstract The continental crust in China consists of the North China,Yangtze and Tarim cratons,along with several micro-continents and orogenic belts surrounding them. Based on their characteristics, this paper presents development of these geological terranes in China during the Ordovician period based on four types: cratons,micro-continents in oceanic plates,orogenic belts,and uncertain terranes. Additionally,by integrating paleogeographic data,a new perspective on the Ordovician geographical division in China is proposed,encompassing sixteen regions within four mega-regions. During the Ordovician,cratons and micro-continents in China were primarily distributed in the peri-Siberian area,the Paleo-Asian Ocean,the Proto-Tethys Ocean and the northern margin of Gondwana,and the four mega-regions were in alignment with these distributions. The North China and Tarim cratons belong to the Proto-Tethys Ocean Mega-region,despite separating the Paleo-Asian and the Proto-Tethys oceans. The North Xinjiang and Xing'an regions are located within the peri-Siberian Mega-region. The former comprises the Altay,Junggar-Tuha micro-continents,and the East and West Junggar orogenic belts,whereas the latter encompasses the Northeast China micro-continental group of Erguna,Xing'an,Xilinhot,Songliao,and Jiamusi. The Central Tianshan-Beishan Region pertains to the Paleo-Asian Ocean Mega-region,and the Yining micro-continent is a member of this region. Except the North China and Tarim regions,the Proto-Tethys Ocean Mega-region includes the Qaidam-Qilian,Kunlun-Qinling,Yangtze,Cathayasia,Indo-China,and Songpan-Ganzi regions. Among them,the middle-Altun and Quanji micro-continents belong to the Qaidam-Qilian Region,and the Yidun micro-continent belongs to the Songpan-Ganzi Region. The Qangtang,Lhasa,Himalaya,Sibumasu and Hainan regions were separated from the Gondwana Mega-region,with the Baoshan and Lincang micro-continents being part of the Sibumasu Region. The Alexa and Dunhuang terranes are included in the North China Region and the Tarim Region, respectively. There is a great difference between the above understanding of the geographical division of Ordovician period in China and that of the predecessors. The author aims to draw more scholars' attention and explore a more reasonable division scheme.
About author: WANG Jianpo,born in 1981,Ph.D.,is an associate researcher of stratigraphy and paleobiology. He is mainly engaged in the research on stratigraphy,palaeobiology and their applications. E-mail: wangjianpo2001-1@163.com.
Cite this article:
WANG Jianpo,WANG Xiaofeng. Re-understanding of the Ordovician geographical division in China[J]. JOPC, 2025, 27(1): 16-16.
WANG Jianpo,WANG Xiaofeng. Re-understanding of the Ordovician geographical division in China[J]. JOPC, 2025, 27(1): 16-16.
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