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地球学报  2004 

吉辽地区新元古代臼齿碳酸盐岩岩相的若干岩石学特征研究

Keywords: 臼齿构造,碳酸盐岩,岩石学特征,沉积环境

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Abstract:

通过研究吉辽地区新元古代地层中一种特殊的沉积构造——臼齿(简称MT)构造,揭示了它的时空分布范围、分类和含该沉积构造岩石的宏观和微观特征,并对该种构造的形成环境进行了简要讨论。吉林辽宁地区的臼齿构造主要发育在新元古代地层中,按其成因可分为原地和异地两类。其中原地MT主要分布在泥晶灰岩、粉屑泥晶灰岩、泥灰岩或泥岩中,按其形态可分为丝状,条带状和瘤状3个亚类,13种微相类型。异地MT主要发育在砂屑灰岩、钙质粉砂岩或粉砂质泥岩中。臼齿碳酸盐岩的岩石学特征指示其形成并发育于稳定克拉通浅海潮下环境,特别是中-深缓坡

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