中国南方早中三叠世岩相古地理

在各基于剖面的地层学及定量岩石学研究的基础上,采用单因素分析综合作图法,编制出了中国南方早中三叠世飞仙关期(印度期)、嘉陵江期(奥伦期)、雷口坡期(安尼期)和天井山期(拉丁期)的各种单因素基础图件及定量岩相古地理图。在这种古地理图中,各一、二、三级古地理单元的确定都有定量的单因素数据为依据。各期岩相古地理的特征可概括为陆海相间,台盆相间,台中有盆,盆中有台,台中有滩和坪,台盆间有斜坡。各期岩相古地理有明显的继承性和发展性。从早三叠世飞仙关期到中2叠世天井山期,是一个较大的海退过程。这种定量的岩相方地理图,为中国南方中下三叠统的油气勘探提供了科学依据。

LITHOFACIES PALAEOGEOGRAPHY OFTHEEARLY AND MIDDLE TRIASSIC OF SOUTH CHINA

Based on the strdy of stratigraphy and quantitative Sedimentology of each frndamental section,according to the "Single Factor Anlysis and Comprehensive Mapping Method",various single factor maps and quantiative lithofacies palaeogeography maps of the Feixianguan Aga (Indian),Jianlingjiang Age(Olenikian),Leikoupo Age (Anisian)and Tianjingshan Age(Ladian) of the Early and Middle Trassic of south china were studied and mapped,In these lithofacies palaeogeography maps,the determination of the first rank,second rank and third rank paleogeographical units was based on quantiative single factror data,The framework of the lithofacies paleogeography of each age can be generalized as follows:lands altemated with seas,platforms altenatedwith basins,in platforms there were basins,in basins therewere platforms,in platforms there werebanks and flats,and there were slopes between pltforms and development Fron the Feixianguan Age of the Earlyu Triassic to the Tianjingshan Age of the Middle Trassic is a relatively large regssion process,Such quantitative study and mapping of lithofacies palaeogeography provid the most fundamental scientific grounds for the exploration of oil and gas in the Lower and Middle Triassic of South China.