中国中奥陶世岩相古地理  

LITHOFACIES PALAEOGEOGRAPHY OF THE MIDDLE ORDOVICIAN IN CHINA

作　　者：冯增昭[1] 彭勇民[1] 金振奎[1] 鲍志东[1] 

机构地区：[1]石油大学,北京100083

出　　处：《古地理学报》2003年第3期263-278,共16页Journal of Palaeogeography：Chinese Edition

基　　金：冯增昭承担的中国石油天然气总公司科研正式项目"中国寒武纪和奥陶纪岩相古地理研究及编图"(94科字第 6 9号 )的最终成果的一部分

摘　　要：本文是中国早、中、晚寒武世和早奥陶世岩相古地理诸文的继续。在笔者等的华北地区、华南地区和西北地区寒武纪和奥陶纪定量岩相古地理研究及编图成果的基础上 ,结合其他地区 (主要是蒙兴地区、昆仑秦岭地区、西藏地区、海南岛地区和台湾地区 )的地质资料 ,编制出了中国中奥陶世岩相古地理图 ,并撰写出本文。华北地区、华南地区和西北地区的研究程度较高 ,其岩相古地理图和文字论述都是定量的。其他地区的研究程度较低 ,其岩相古地理图和文字论述则是定性的和概略性的。中国中奥陶世岩相古地理的基本格局仍和寒武纪及早奥陶世的一样为“两槽和三台相间分布”。两槽即天山北山蒙辽吉槽地和昆仑秦岭槽地 ,三台即准噶尔蒙兴台地、塔里木柴达木华北台地和西藏华南台地。但是这些古地理单元及其次级古地理单元的特征却和寒武纪及早奥陶世的有所不同或大不相同。This paper is a continuation from a series of papers on lithofacies palaeogeography of the Early,Middle and Late Cambrian and Early Ordovician in China. It is based on the present writers' achievements of study and mapping of quantitative lithofacies palaeogeography of the Cambrian and Ordovician in North China,South China and Northwest China. On such a basis,in combination with the geological data of other areas,mainly Mongolia-Xinganling,Kunlun-Qinling,Tibet,Hainan Island and Taiwan areas,through comprehensive analysis and judgment,the lithofacies palaeogeography map of the Middle Ordovician in China is compiled and this paper is completed. In this paper,the lithofacies palaeogeography in North China,South China and Northwest China is quantitative and the description is in detail,while the lithofacies palaeogeography in other areas is qualitative and the description is general. In the Middle Ordovician,the lithofacies palaeogeography framework of 'two troughs alternating with three platforms'in the Early,Middle and Late Cambrian and Early Ordovician was unchanged. The two troughs are Tianshan-Beishan-Mongolia-Liaoning-Jilin Trough and Kunlun-Qinling Trough. The three platforms are Junggar-Mongolia-Xinganling Platform,Tarim-Qaidam-North China Platform and Tibet-South China Platform. The scopes of these palaeogeographic units in the Middle Ordovician are basically the same as those in the Early,Middle and Late Cambrian and Early Ordovician,but the characteristics of their second-rank palaeogeographic units are different from those.

关 键 词：中国 中奥陶世 岩相古地理 槽地 台地 定量 

分 类 号：P531[天文地球—古生物学与地层学]