Sedimentary Facies in the Lower Cretaceous Nanxin Formation in the Yunlong Region, Western Yunnan Province

详细信息   

• 责任者：Sun Yong (College of Earth Sciences ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Li Xianghui
• 刊名：Sedimentary Geology and Tethyan Geology
• 出版年：2012
• 卷期：32(2)
• 关键词：沉积相 ; sedimentary facies ; 早白垩世 ; Lower Cretaceous ; 云南 ; Yunnan Province
• 页码：p.23-30
• 图表：4 illus., 1 table, 28 refs.
• 分类号：0803
• issnNo：ISSN1009-3850
• isbnNo：CN51-1593/P

摘要

///A cross section across the Lower Cretaceous Nanxin Formation was measured in the Yunlong region, western Yunnan Province. In the light of lithology, sedimentary structures and sectional architectures, the sedimentary facies in the Nanxin Formation mostly consist, from the base upwards,of the meandering stream and lake facies interbedded or intercalated with thin palaeosol facies. More precisely, the meandering stream facies may be subdivided into the channel, point bar, overbank and natural levee subfacies. The lake facies may be  subdivided into the littoral lake, shallow lake and bathyal lake subfacies, and the palaeosol facies may be classified into calcareous soil and gley soil. The sedimentary facies sequences and associations indicate the variations in regional tectonics from relative active to stable tectonics, and the subtropic semi-arid to arid palaeoclimates during the deposition of the Lower Cretaceous Nanxin Formation.