辛浩;肖恩照;覃英伦;张震武;

• 1:中国地质大学(北京)地球科学与资源学院

• 2:中国地质调查局油气资源调查中心

摘要(Abstract)：

鲁西地区仙人洞剖面寒武系出露连续且沉积现象丰富,芙蓉统凤山组中部发育大型柱状叠层石。在层序地层框架下,基于野外观察,研究大型柱状叠层石的沉积特征。结果表明:寒武系凤山组大型柱状叠层石宏观上呈局部集中产出,柱状体边界清晰,纹层精美,横截面呈圆饼状,相对较大的柱状体直径代表华北地台寒武系叠层石的特殊类型。凤山组叠层石主要由致密泥晶、微亮晶构成,内部可见白云石、生物碎屑、黄铁矿颗粒;在柱状叠层石中可见大量保存精美的葛万菌(Girvanella)、胞网菌(Bacinella)等钙化微生物化石。凤山组大型柱状叠层石的建造者是以蓝细菌为主导的光合作用微生物席。特殊不规则网状物中的钙化丝状体及零星分散的黄铁矿颗粒,指示在大型柱状叠层石形成过程中微生物席内部存在复杂的微生物新陈代谢活动。仙人洞剖面凤山组大型柱状叠层石的发现既为寒武系叠层石研究提供典型实例,也为显生宙第一幕蓝细菌钙化作用发生期提供重要的岩石记录。

关键词(KeyWords)：叠层石;钙化微生物;微生物席;寒武系;芙蓉统;凤山组;仙人洞剖面;鲁西地区

Abstract:

Keywords:

基金项目(Foundation):国家自然科学基金项目(41472090);国家自然科学基金项目(40472065)

作者(Author):辛浩;肖恩照;覃英伦;张震武;

Email:

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