南口虎峪中元古界大红峪组混积岩系的层序地层划分——海侵砂岩中的微生物席碎片简介Sequence-Stratigraphic Divisions of the Mixed Rock System for Mesoproterozoic Dahongyu Formation at Huyu Section of Nankou Town in Beijing: Brief Intruduction on Microbial Mat Chips in Transgressive Sandstones
梅冥相;刘智荣;孟庆芬;高金汉;
摘要(Abstract):
北京西北郊南口虎峪一带的中元古界长城系大红峪组发育完整,以一套混积岩系为特征。在南口虎峪剖面中,海侵体系域砂岩地层与高水位体系域砂泥质白云岩和叠层石白云岩组成了较有规律的层序地层相序,可以作为混积岩系层序地层划分的典型代表。在大红峪组的海侵体系域砂岩中,变余波痕、微生物形成的砂质碎片和皱饰构造表明了席底的发育,特别是其中所发育的微生物砂质碎片不但代表了碎屑岩中的一种特殊的“内碎屑”,而且其特殊的形态和产出特点成为窥视前寒武纪砂岩中席底发育的一种典型标志,从而有益于今后对类似沉积构造的阐释与研究;高水位体系域砂泥质白云岩中的纹理化构造似乎也是一种席底构造,它与其中的叠层石生物丘一起代表了前寒武纪海底微生物孤军作战的特殊生境。对该剖面大红峪组的初步研究表明,在前寒武纪地层中,除了要关注叠层石之类的微生物沉积构造以外,碎屑岩中也存在微生物活动的若干证据即席底构造(第五类原生沉积构造),由此说明正是由于微生物新陈代谢的多样性才使其成为地球上无所不在及其无与伦比的巨大生物量。
关键词(KeyWords): 混合岩系;层序地层学;微生物席碎片;中元古界大红峪组;北京南口虎峪剖面
基金项目(Foundation): 国家自然科学基金项目(4980101240472065)
作者(Author): 梅冥相;刘智荣;孟庆芬;高金汉;
Email:
DOI:
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