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地球学报  2009 

峡东伊迪卡拉纪陡山沱组顶部重晶石特征与地质意义研究

DOI: 10.3975/cagsb.2009.04.09

Keywords: Ediacaran,陡山沱组,重晶石,δ13C

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Abstract:

陡山沱组顶部潮间带泻湖相泥页岩中发现重晶石,其宏观、微观特征以及测试分析结果表明为早期成岩成因。结合产出层位沉积和地球化学特征认为,陡山沱组沉积中期和末期发生显著海平面下降,导致沉积速率降低至无沉积或沉积间断,使已埋藏有机质暴露、氧化和陆源物质输入增加,从而导致早期成岩重晶石和大型钙质结核发育和δ13C高负异常等。深水环境的变迁可能是导致陡山沱组下部发育的大型具刺疑源类生物灭绝的原因。野外沉积学特征考察显示,陡山沱组底部、内部以及与灯影组接触部位可能存在沉积间断、饥饿沉积或平行不整合。上述研究对深入理解陡山沱组顶部年龄、早期生物演化、辐射以及Ediacaran地质历史演化具有新的启示作用。

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