河南卫辉地区寒武系第三统馒头组二段中的核形石及其沉积特征

发布时间：2018-06-30 03:06

本文选题：生物地球化学 + 潮间—潮下带水道　；参考：《中国科技论文》2016年21期

【摘要】：为重建河南卫辉地区寒武纪古环境,揭示微生物岩的成因及演化规律,对河南卫辉地区寒武系第三统馒头组二段中的核形石进行了野外地质调查和室内微观分析。识别出2种不同类型的核形石,其中椭圆形核形石由较小的核心和不规则的明、暗纹层组成,与大量不规则泥质条带伴生,形成于高、低能交替的潮间水道;帽状—圆状核形石发育较大的核心和规则的明、暗纹层,与缓波状叠层石伴生,形成于高、低能交替的潮间—潮下水道。馒头组二段含核形石灰岩垂向序列自下而上呈潮上—潮间带泥、灰坪—潮间—潮下带水道、近岸鲕粒浅滩相的变化规律,反映了海平面向上缓慢上升、水动力逐渐增强的过程。
[Abstract]:In order to reconstruct the Cambrian Paleoenvironment in Weihui, Henan, and to reveal the genesis and evolution of the microbial rocks, the field geological investigation and indoor microscopic analysis of the nucleate in the two section of the third Cambrian steamed bun formation, Weihui, Henan, have been carried out, and 2 different types of nucleates are identified, and the middle ellipsoidal nucleates are small core and irregular. The bright, dark stripe layer, associated with a large number of irregular muddy strips, formed in high and low energy intertidal waterways; the core and regular bright, dark striate layers of the cap shaped rounded nucleate, accompanied by the slow ripple stones, formed in the high and low energy alternating intertidal and tidal sewers. The vertical sequence of the two stages of the steamed bun formation of the nuclear limestone is from the vertical sequence of the steamed bun formation. The downward trend of the tidal upper intertidal mud, the grey flat - intertidal - subtidal channel and the oolitic shoal facies in the near shore reflects the gradual upward trend of the sea level and the gradual enhancement of the hydrodynamic force.
【作者单位】：河南理工大学资源环境学院;
【分类号】：P593

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