桂北下震旦统层序及沉积相特征——以桂北三江震旦系剖面为例  

THE LOWER SINIAN STRATIGRAPHIC SEQUENCES AND CHARACTERISTICS OF SEDIMENTARY ACIES IN NORTH GUANGXI, AS EXEMPLIFIED BY THE SANJIAN SINIAN STRATIGRAPHIC SECTION IN NORTH GUANGXI

作　　者：田景春[1] 

机构地区：[1]成都地质学院

出　　处：《南方国土资源》1990年第2期39-45,共7页

摘　　要：研究区下震旦统发育,出露良好,是扩充和完善我国峡东层型剖面的重要地区之一。依据岩石地层学、气候地层学的方法、及与邻区的对比,本文对桂北地区下震旦统进行了新的划分:由下向上划分为长安组、富禄组、铁丝坳组、大塘坡组和南沱组;在此基础上对区内各组沉积相进行了研究,主要包括冰碛泥石流相、冰筏-正常海洋相、浊流相、滨外陆棚浅滩相、滩间洼地区,并简述了沉积相的时空演化规律。这些研究对解决整个南方震旦纪地层划分对比的统一及沉积相的时空演化具有重要意义。The study area where lower Sinian strata developed and exposed well is one of the important areas where eastern Sanxia stratotypic section in China is supplemeted. In the light of the methods of lithstratigraphy and climatic stratigraphy as well as the stratigraphic correlation to adjacent areas, the author has newly divided the lower Sinian strata in north Guangxi into five formations.namely from bottom to top, Changan Formation,Fulu For-mation,Tiesian Formation,Datangpo Formation and Nantuo Formation; Therefore, the author has studied the sedimentary facies of each formation in the area, mainly including moraine-mudflow facies, ice rafting-normal oceanic facies, turbidite facies, offshore shelf shallow facies and interbank depressions, and has briefly stated the evolution of sedimentary facies in time and space. All these studies on solving the unity of stratigraphic division and correlation and the evolution of sedimentary facies in time and space in whole of South China Sinian is of significance.

关 键 词：桂北 下震旦统 沉积相 时空演化 

分 类 号：P[天文地球]