张震武;肖恩照;覃英伦;辛浩;

• 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)：

以鲁西地区莱芜雪野剖面寒武系苗岭统凝块石为研究对象,分析华北地台早古生代碳酸盐台地微生物岩沉积特征;基于野外与显微观察,从宏观与微观尺度研究凝块石沉积特征与成因机制。结果表明:宏观上,将莱芜雪野剖面寒武系苗岭统划分为4个三级层序,凝块石集中发育于剖面的徐庄组和张夏组顶部,进一步划分为斑状、粗粒凝聚状、网状、条带状和树枝状凝块石。微观上,凝块石内部发育种类丰富、数量众多的钙化微生物化石,如附枝菌(Epiphyton)、葛万菌(Girvanella)、肾形菌(Renalcis)、放射状菌(Actinophycus)、胞网菌(Bacinella)和"石松藻(Lithocodium)"状钙化蓝细菌残余物等。凝块石是以蓝细菌为主导的微生物席内复杂的微生物沉淀作用形成的,证明早古生代微生物碳酸盐岩的复苏,不但为寒武系苗岭统凝块石等微生物碳酸盐岩的成因研究,以及贫乏骨骼风暴海的碳酸盐台地微生物岩沉积作用研究提供实例,也为研究寒武纪第二世末期生物灭绝事件之后华北地台碳酸盐台地沉积作用提供参考。

关键词(KeyWords)：凝块石;微生物碳酸盐岩;微生物席;沉积特征;寒武系;雪野剖面

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):张震武;肖恩照;覃英伦;辛浩;

Email:

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