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hua bei di tai wan qian han wu ji chao xi chen ji
Pages: 135-141+195-196
Year: Issue:  2
Journal: Oil & Gas Geology

Keyword:  潮汐沉积晚前寒武纪华北地台沉积序列叠层石潮控三角洲沉积模式沉积环境碳酸盐岩藻白云岩;
Abstract: The Late Precambriam tidal deposits are well developed and widely distri-buted in North China Platform.The major evidence of tidal sedimentationin these sediments includes herringbone cross bedding,lenticular beding,wavy bedding,flaser bedding,tidal channel-fill cross bedding,reactivationsurfaces,various types of ripple marks and interference ripple marks,trun-cated ripple marks,washout structures,rill marks,mud cracks,and pene-contemporaneous deformation structures.In addition,oolites,algae andstromatolites are very significant.The depositional sequences and models ofclastic tidal flat,tidal-dominated delta,ferric algal flat and oolitic bank,and carbonate tidal flat(or platform)are discussed here.Four sketch mapabout these tidal deposits during the early and late Changchen(the GreatWall),the Jixian,and the Qingbaikou are also given.Finally,it is supposedthat these tidal deposits were mainly formed in the epeiric seas on the plat-form margin.
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