Significance of microbial binding in the formation and stabilization of a silurian carbonate forereef slope

IF 1.8 3区 地球科学 Q1 GEOLOGY
Facies Pub Date : 2024-07-01 DOI:10.1007/s10347-024-00684-z
Alejandra Santiago Torres, G. Michael Grammer, Gregor P. Eberli, Mara R. Diaz, Jay M. Gregg
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引用次数: 0

Abstract

The effect of microbial binding for the stabilization of steep carbonate slopes is well documented in Cenozoic examples but its significance and relationship with abiotic marine cements in Paleozoic reef systems and steep slopes is not clearly established. Here, samples from a Late Silurian (Ludlovian) reef complex are evaluated by using an integrated approach that involves petrographic and isotope analyses, cathodoluminescence microscopy, and environmental scanning electron microscopy. This study reveals the in situ production of mineral fabrics of microbial origins, including micrite, peloidal micrite with dendritic fabrics, meniscus, and bridge-like cements. This study stresses the leading role of microbes in the early lithification stages that led to the stabilization of Silurian steep carbonate slopes. These findings are further supported by the occurrence of fossilized microbes and extracellular polymeric substance. The micritic cements are the first step in the diagenetic paragenesis followed by abiotic fibrous and equant calcite cements whose stable isotope values are in concert with estimated values of calcite precipitated in equilibrium with Silurian seawater. Results from this project provide insights into the relationship between microbial binding and early abiotic marine cements in ancient reef systems and, further, provide evidence for a consortia of microbes that existed 440 Ma ago.

Abstract Image

微生物结合在硅质碳酸盐前礁斜坡形成和稳定过程中的意义
微生物结合对稳定陡峭碳酸盐斜坡的作用已在新生代实例中得到充分证明,但其在古生代礁石系统和陡峭斜坡中的意义及其与非生物海洋胶结物之间的关系尚未明确确定。在此,我们采用一种综合方法,包括岩相和同位素分析、阴极发光显微镜和环境扫描电子显微镜,对一个晚志留纪(卢德洛夫纪)礁群的样本进行了评估。这项研究揭示了微生物在原地产生的矿物结构,包括微晶岩、带有树枝状结构的球状微晶岩、半月板和桥状胶结物。这项研究强调了微生物在导致志留纪陡峭碳酸盐岩斜坡稳定的早期岩化阶段所起的主导作用。微生物化石和细胞外聚合物质的出现进一步证实了这些发现。微晶胶结物是成岩副成因的第一步,随后是非生物纤维状和等方解石胶结物,其稳定同位素值与志留纪海水平衡沉淀的方解石的估计值一致。该项目的研究结果使人们深入了解了古珊瑚礁系统中微生物结合与早期非生物海洋胶结物之间的关系,并进一步为 440 万年前存在的微生物群提供了证据。
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来源期刊
Facies
Facies 地学-地质学
CiteScore
3.70
自引率
5.60%
发文量
15
审稿时长
>12 weeks
期刊介绍: The journal is open to papers dealing with the interpretation of ancient and modern biotopes and carbonate depositional environments by means of facies analysis in its broadest sense. Once the central part of research in hydrocarbon exploration, facies analysis more and more integrates modern and ancient biogeological processes of a changing earth. Special emphasis is laid on paleobiology and -ecology, basin evolution, sedimentology including diagenesis and geochemistry, as well as studies emphasising the impact of life on earth history. The main part of the target group will be people in academia.
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