在沙特阿拉伯红海 Sheybarah 岛发现现代潮间带生物叠层石

Geology Pub Date : 2024-02-15 DOI:10.1130/g51793.1
Volker Vahrenkamp, V. Chandra, E. Garuglieri, R. Marasco, Kai Hachmann, Pankaj Khanna, Daniele Daffonchio, Alexander Petrovic
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引用次数: 0

摘要

微生物碳酸盐,尤其是叠层石,代表了地球上生命最早的地质记录,作为唯一的生物碳酸盐工厂,它们在地球上占据了将近 3 亿年的时间,从早生代到晚新生代。现代的 "活 "叠层石非常罕见,稀少地分布在全球各地,通常被置于极端的环境壁龛中,成为过去大量微生物的遗迹。在这里,我们报告了在中东地区首次发现的活体浅海叠层石,位于红海大陆架东北部(沙特阿拉伯)的 Al Wajh 碳酸盐平台 Sheybarah 岛上。我们详细介绍了它们的区域分布情况,并描述了它们的环境条件、内部结构和微生物多样性。我们还报告了在光环境中首次发现的与这些叠层石有关的网状细丝。Sheybarah叠层石出现在向海海滩的潮间带到浅亚潮带,有三种深度生长形式。它们的内层是由微生物介导的沉积物颗粒增生和差异岩化形成的。微生物成分分析表明存在多种微生物生命形式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Discovery of modern living intertidal stromatolites on Sheybarah Island, Red Sea, Saudi Arabia
Microbial carbonates, and stromatolites in particular, represent the earliest geological record of life on Earth, which dominated the planet as the sole biotic carbonate factory for almost 3 b.y., from the Archean to the late Proterozoic. Rare and sparsely scattered across the globe in the present day, modern “living” stromatolites are typically relegated to extreme environmental niches, remaining as vestiges of a prodigious microbial past. Here, we report the first discovery of living shallow-marine stromatolites in the Middle East, on Sheybarah Island, Al Wajh carbonate platform, on the NE Red Sea shelf (Saudi Arabia). We detail their regional distribution and describe their environmental conditions, internal structures, and microbial diversity. We also report the first discovery of reticulated filaments in a photic setting, associated with these stromatolites. The Sheybarah stromatolites occur in the intertidal to shallow subtidal zones along the seaward-facing beach in three depth-dependent growth forms. Their inner layers were formed by microbially mediated accretion and differential lithification of sediment grains. Compositional microbial analysis revealed the presence of a wide range of microbial life forms.
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