古地理学报Issue(3)：347-357,11.DOI:10.7605/gdlxb.2015.03.029
四川盆地磨溪-高石梯地区下寒武统龙王庙组颗粒滩特征及分布规律
Characteristics and distribution of grain bank of the Lower Cambrian Longwangmiao Formation in Moxi-Gaoshiti area,Sichuan Basin
摘要
Abstract
In this paper,the authors focused on grain bank of the Lower Cambrian Longwangmiao Formation in Moxi-Gaoshiti area,Sichuan Basin.Combined with abundant materials,such as drilling and logging data,cores and thin sections,the characteristics,distribution and its major controlling factors of grain bank in the Longwangmiao Formation were synthetically analyzed.There are two main rock types of grain bank in research area,one is grain dolostone with obvious granular structure,which is dominated by dolarenite and oolite dolostone,and the other is crystal grain dolostone with residual granular structure. Grain bank mainly has upward shallowing and granularity coarsening sequences,and could constitute sedi-mentary sequences of interact bank sea -grain bank and restricted lagoon -grain bank with lower fine-grained sediment in the vertical direction.In the lateral direction,grain bank has good continuity and is characterized by continuous distribution in a large area.On the plane,the development degree of grain bank increases gradually from northwest to southeast.Further analysis shows that the development charac-teristics and superimposed pattern of grain bank in the Longwangmiao Formation were determined by the relative sea-level change and sedimentary energy variation,the development horizon and degree of grain bank were formed by different grades of sea level fluctuation,and the palaeogeomorphology finally deter-mined the difference of planar distribution of grain bank during the depositional period of Longwangmiao Formation.关键词
颗粒滩/海平面/古地貌/龙王庙组/四川盆地Key words
grain bank/sea level/palaeogeomorphology/Longwangmiao Formation/Sichuan Ba-sin分类
天文与地球科学引用本文复制引用
金民东,谭秀成,李凌,曾伟,连承波,罗冰,山述娇,周涛..四川盆地磨溪-高石梯地区下寒武统龙王庙组颗粒滩特征及分布规律[J].古地理学报,2015,(3):347-357,11.基金项目
“十二五”国家科技攻关重大专项项目（编号2011 ZX05004－005－03）和国家自然科学基金项目（编号41402126）共同资助 （）
