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作 者:王建坡[1] 汪啸风[1] WANG Jianpo;WANG Xiaofeng(Hubei Key Laboratory of Paleontology and Geological Environment Evolution,Wuhan Center of China Geological Survey,Wuhan 430205,Hubei)
机构地区:[1]古生物与地质环境演化湖北省重点实验室,中国地质调查局武汉地质调查中心,湖北武汉430205
出 处:《古地理学报》2025年第1期16-31,共16页Journal of Palaeogeography:Chinese Edition
基 金:中国地质调查局项目(编号:DD20230218,DD20242327)资助。
摘 要:中国大陆地壳在奥陶纪时由华北、扬子、塔里木三大陆块及围绕它们的诸多微陆块和造山带组成。基于陆块、微陆块和造山带等不同属性地体的识别特征,按陆块、洋板块中的微陆块、造山带和疑问块体4种类型,分别阐述它们在中国奥陶纪的发育特征。在此基础上,综合古地理信息,提出中国奥陶纪共划分出4个大区16个地理区的新认识。该时期中国各陆块主要在环西伯利亚、古亚洲洋、原特提斯洋和冈瓦纳北缘分布,由此归纳为4个大区,其中华北和塔里木分割了古亚洲洋和原特提斯洋,但归入原特提斯洋大区中。环西伯利亚大区可分为北疆区和兴安区,前者由阿尔泰、准噶尔—吐哈微陆块和东西准噶尔造山带组成,后者囊括额尔古纳、兴安、锡林浩特、松辽和佳木斯等东北微陆块群。古亚洲洋大区仅分出中天山—北山区,伊宁微陆块为该区成员。原特提斯洋大区除了华北区和塔里木区外,还包括柴达木—祁连、昆仑—秦岭、扬子、华夏、印支和松潘—甘孜区,其中中阿尔金和全吉微陆块属于柴达木—祁连区,义敦微陆块属松潘—甘孜区。冈瓦纳大区分为羌塘、拉萨、喜马拉雅、滇缅泰马和海南区,其中保山微陆块和临沧微陆块为滇缅泰马区的组成部分。此外,阿拉善和敦煌块体分别归入华北和塔里木区中。上述中国奥陶纪地理分区的认识与前人存在较大差异,作者旨在抛砖引玉,希望能引起更多学者关注并探求更合理的划分方案。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
分 类 号:P531[天文地球—古生物学与地层学]
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