古地理学报Issue(3)：321-334,14.DOI:10.7605/gdlxb.2015.03.027
川北早寒武世碳酸盐岩台缘斜坡沉积特征及变形构造形成机制探讨
Sedimentary characters of carbonate platform marginal slope of the Early Cambrian in northern Sichuan Basin and perspective of deformation structures
摘要
Abstract
In this paper,a case study of the Lower Cambrian Xiannüdong Formation in Tangjiahe, Wangcang County of western Micang Mountain was conducted.On the basis of the observation and analysis with microscope,the bottom of Xiannüdong Formation is composed of six major rock types,such as bio-clastic mudstone,silty mudstone,analogous-nodular limestone,rudstone,algal clot limestone and cal-careous sandstone with bioclastic,and is characterized by rudstone,analogous-nodular limestone,algal clot limestone,slump deformation structure and slide structure.Further analysis shows that L-M associa-tion was mostly deposited in low-energy slope environment.The rudstone,as a part of the L′-R associa-tion,deposited by the collapse and slump from the mud mounds in upper slope.The other part,analo-gous-nodular limestone,deformed from L-M association,was supposed synthetical effects by the collapse and slump from mud mounds,the force of differential compaction and the pressure solution caused by the differences of the components.These effects can be used to break the limestone layer to be rudstone shape, even lead to generate some slightly displacement.As a result,L-M,also be called ribbon rocks,become littery deformation structures.Mb association can be considered a mud mounds environment in upper slope. S-M association was deposited in turbidity environment of upper slope.After establishing the sedimentary model and the four associations of slope,all of the evidences indicate that at least during the Early Cam-brian Xiannüdong period,the platform marginal slope was developed in western Micang Mountain.关键词
斜坡灰泥丘/似瘤状砾屑灰岩/变形机制/台缘斜坡/仙女洞组/寒武系/四川盆地Key words
slope mud mounds/analogous-nodular limestone/deformation mechanism/platform marginal slope/Xiannüdong Formation/Cambrian/Sichuan Basin分类
天文与地球科学引用本文复制引用
沈骋,谭秀成,李凌,施开兰,苏成鹏,连承波,黎虹玮,肖笛..川北早寒武世碳酸盐岩台缘斜坡沉积特征及变形构造形成机制探讨[J].古地理学报,2015,(3):321-334,14.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）和四川省省属高校“天然气地质”科研创新团队建设计划联合资助 （）
