Microfacies and Environment Analysis of the Carboniferous Carbonates in Jiangyou-Guangyuan Area, Sichuan Province
详细信息
- 责任者：Xu Jinlong (School of Resources and Environmental Engineering ; Hefei University of Technology ; Hefei 230009 ; China) ; Jia Zhihai
- 刊名：Acta Sedimentologica Sinica
- 出版年：2012
- 卷期：30(5)
- 关键词：碳酸盐岩 ; carbonate rocks ; 沉积微相 ; sedimentary microfacies ; 四川 ; Sichuan Province
- 页码：p.834-846
- 图表：6 illus., 2 plates, 25 refs.
- 分类号：0803
- issnNo：ISSN1000-0550
- isbnNo：CN62-1038/P
摘要
The Jiangyou-Guangyuan area, which is located in the north margin of the Longmen Mountain Nappe Structural Belts, is one of the classic areas for the upper Carboniferous researches in Sichuan Basin and even in the Upper Yangtze Plate. The upper Zongchanggou Formation,which was considered as one part of the lower Carboniferous,is amended to the upper Carboniferous Huanglong Formation in this paper.The upper Carboniferous is divided into four parts.Fifteen microfacies can be divided according to field observation,laboratory micro-analysis and classification of carbonate rocks.The combination characteristics of the depositional facies belts indicate that several transgression to regression occurred during the late Carboniferous and the maximum transgression occurred the late Huanglong Formation with Carbonate deposit in the northwest Sichuan and eastern Sichuan. The studied special layer in Jiangyou-Guangyuan area have shown that four storm layers and storm sedimentary combinations are formed in the upper shelf environment as proximal storms rocks in Huanglong Formation.The analyses of the REEs are related to their depositional environments,especially ΣREE,LREE,HREE,δCe,δEu and Y/Ho are displayed regularly.As indicate that REE characteristics are affected by ancient climate cycles(glacial-interglacial cycle) and the periodical sea level changes in the Late Carboniferous.