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首页> 外文期刊>Facies >Microbialite elongation by means of coalescence: an example from the middle Furongian (upper Cambrian) Notch Peak Formation of western Utah
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Microbialite elongation by means of coalescence: an example from the middle Furongian (upper Cambrian) Notch Peak Formation of western Utah

机译：聚结作用引起的微斜岩的伸长：以犹他州西部中部芙蓉岩（上寒武统）刻痕峰组为例

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摘要

Strongly elongate microbialites having axial ratios greater than 4:1 and sometimes exceeding 10:1, are currently forming in modern, shallow-subtidal to intertidal environments. Construction of these elongate forms is greatly dependent on hydrodynamics, microbially influenced trapping and binding of sediment, and/or precipitation of peloidal cement, and intertidally generated abrasion and mechanical scour over sheet-like microbial mats. Some of these processes, however, are inadequate for explaining the construction of strongly elongate structures in deep-subtidal or wave-restricted environments. Since elongate morphogenesis is an important factor in paleoenvironmental reconstructions, ancient examples of elongate-related growth sequences should be documented and compared with modern analogues. This paper explores such a growth sequence from a 13-m-thick, middle Furongian (upper Cambrian) microbialite bed in western Utah that records a morphological succession of deep, subtidal microbialites in vertical section over a large geographical area. Microbialites change from round, decimeter-sized forms to large, elongate structures many meters in length, reverting back to round, centimeter-sized shapes at the top of the bed. We suggest that these elongate microbialites formed as a result of coalescence, a process known to produce compound microbialite structures in shallow water, but seldom explored as a key factor in the elongation of deep, subtidal forms that grew in ancient environments.
机译：目前，在现代的浅潮下到潮间环境中，已经形成了轴向比率大于4：1有时超过10：1的强伸长微形岩。这些细长形式的构造在很大程度上取决于流体动力学，微生物影响的沉积物的捕集和结合，和/或胶体水泥的沉淀，以及在片状微生物垫上产生的磨损和机械冲刷。但是，这些过程中的某些过程不足以解释在深潮下或受波限制的环境中构造细长结构的情况。由于拉长的形态发生是古环境重建的重要因素，因此应记录拉长相关生长序列的古代实例，并将其与现代类似物进行比较。本文从犹他州西部一个厚度为13米的中部芙蓉岩（上寒武统）微辉石床中探索了这样的生长顺序，该床记录了在较大地理区域内垂直剖面中深部，潮下带微辉石的形态演替。微生物的形态从圆形，分米大小的形状变为长数米的大型细长结构，并在床顶恢复成圆形，厘米大小的形状。我们建议这些细长的微斜沸石是由于聚结而形成的，该过程已知在浅水中产生复合的微斜沸石结构，但很少探讨将其作为在古代环境中生长的深部潮汐形式的延长的关键因素。

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