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首页> 外文学位 >Multiple origins of microbial fabrics in thrombolitic and stromatolitic structures from the Neoproterozoic Beck Spring Dolomite.
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Multiple origins of microbial fabrics in thrombolitic and stromatolitic structures from the Neoproterozoic Beck Spring Dolomite.

机译：微生物织物的起源是新元古代的贝克斯普林白云岩的血栓和层间构造。

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摘要

The Neoproterozoic Beck Spring Dolomite contains a diverse range of microbialite morphologies, including thrombolitic, stromatolitic, and composite microbial textures. The co-occurrence of these microbialites provides a unique opportunity to evaluate the environmental and biological controls on microbialite morphogenesis, and in particular, on microstructure development. New informal stratigraphic members are defined based on primary depositional facies assemblages: the lower laminated member, the middle intraclastic member, the middle thrombolitic member, and the upper cherty member. Facies of the Beck Spring Dolomite represent a microbially dominated environment with deposition from the intertidal to deep subtidal zones.;Beck Spring stromatolitic, thrombolitic, and composite microbialites from the thrombolitic member formed on a shallow marine platform in the intertidal to shallow subtidal environment with high lateral variability in water depth and associated environmental factors such as exposure, wave energy, and sedimentation rate. Although the distribution of thrombolitic and stromatolitic microbialites is influenced by environmental conditions, their internal fabrics reflect diverse community compositions. The co-occurrence of laminated and clotted fabrics in compound microbial microstructures demonstrates that morphologically distinct microbial communities occurred simultaneously. Following development and early cementation of Beck Spring microbialites, some microstructures were significantly modified from their original form by biological degradation and physical disruption in the diagenetic environment. These observations demonstrate that the dominant control on some microstructures is biologic, and taphonomic processes are not equally important in the development of all microbial microstructures. Clotted microstructures have multiple origins.
机译：新元古代的贝克斯普林白云岩包含多种微辉石形态，包括血栓形成，层间质形成和复合微生物质地。这些微斜沸石的共存为评估微斜沸石形态发生，尤其是微结构发展的环境和生物学控制提供了独特的机会。根据主要的沉积相组合定义了新的非正式地层成员：下部层状成员，中间碎屑内成员，中间血栓形成成员和上层珍贵成员。贝克斯普林白云岩的相代表了一个以微生物为主的环境，其沉积物从潮间带到潮间带深处沉积。水深的横向变化以及相关的环境因素，例如暴露，波能和沉积率。尽管血栓和层间微生物的微辉石的分布受环境条件的影响，但它们的内部结构反映了不同的群落组成。复合微生物微观结构中层状和凝结织物的共存表明，形态学上不同的微生物群落同时发生。在贝克弹簧矿微斜岩的发展和早期胶结作用之后，某些微结构因其在成岩环境中的生物降解和物理破坏而从其原始形态发生了显着变化。这些观察结果表明，对某些微结构的主要控制是生物学的，并且在所有微生物微结构的发展过程中，成胶过程并非同等重要。凝集的微观结构有多种起源。

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  • 作者

    Harwood, Cara Lynne.;

  • 作者单位

    University of California, Davis.;

  • 授予单位 University of California, Davis.;
  • 学科 Geology.;Paleontology.
  • 学位 M.S.
  • 年度 2009
  • 页码 106 p.
  • 总页数 106
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;古生物学;
  • 关键词

  • 入库时间 2022-08-17 11:38:29

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