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首页> 外文期刊>Facies >Evidence for a local reef eclipse in a shallow marine carbonate environment following the regional extinction of archaeocyaths in Laurentia (Stage 4, Cambrian)
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Evidence for a local reef eclipse in a shallow marine carbonate environment following the regional extinction of archaeocyaths in Laurentia (Stage 4, Cambrian)

机译：在劳伦西亚群组群灭绝的浅海洋碳酸盐酸盐环境中，当地珊瑚礁蚀的证据（第4阶段，寒武纪）

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摘要

Archaeocyathan sponges were the dominant metazoan framework builders during Series 2 of the Cambrian. After their near extinction during the Toyonian stage (middle Stage 4), this important ecological role was eventually filled by robustly skeletonized lithistid sponges. However, the exact timing of ecological restructuring is not well understood and was likely not contemporaneous across different paleocontinents. For example, reefs from the Wuliuan of China appear to show rapid replacement of archaeocyaths with lithistid sponges, yet the earliest occurrence of lithistids in Laurentia is not until the early Furongian. In this study, we explore the Mule Spring Limestone of Nevada, which contains shallow water carbonate environments from the immediate aftermath of the regional archaeocyathan extinction, for signs of reef-building activity. Within this formation, we find evidence of sparse microbial-built leolites and some potentially poorly preserved metazoan organisms. However, the totality of our field observations and thin-section point counts suggest that there was no substantial reef-building activity by either microbial or metazoan organisms within our study locality. Our data suggest the occurrence of a local reef eclipse during this interval for the locality investigated. We also incorporate geochemical proxies to determine paleoredox conditions, which suggest well-oxygenated marine conditions through the period of interest. Lack of hardground substrate is proposed as the cause for this gap in the reef record. These results show that a temporary loss of framework-building activity occurred after the regional extinction of archaeocyaths and demonstrates the ecological impact of losing framework builders on a reef environment.
机译：Archaeocyathan海绵是寒武纪的2系列中的主导地质框架建设者。在复杂的舞台期间濒临灭绝之后（中间第4阶段），这一重要的生态作用最终由强大的骨架岩石激动的海绵填充。然而，生态重组的确切时间尚不清楚，并且可能在不同古连素中的常时。例如，来自中国武源的珊瑚礁似乎表现出与岩石激的海绵的古老阴道快速更换，但劳伦蒂亚的最早发生的岩石发生在早期的芙蓉。在这项研究中，我们探索了内华达州的骡子弹簧石灰石，其中含有浅水碳酸盐环境，从区域古老的古老阴部灭绝的立即进行，为珊瑚礁建设活动的迹象。在这种形成中，我们发现稀疏的微生物建造叶布的证据，以及一些可能持久的美唑烷生物。然而，我们的实地观测和薄切片点的整体表明，在我们的研究过程中，微生物或甲卓妥有机体没有大量的珊瑚礁建筑物。我们的数据建议在此间隔内调查的间隔内发生本地珊瑚礁的发生。我们还纳入地球化学代理以确定古罗福毒的条件，通过感兴趣的时期提出了良好含氧的海洋状况。建议缺少硬盘基板作为珊瑚礁记录中这种间隙的原因。这些结果表明，在群组阴部的区域灭绝后发生了框架建筑活动的暂时损失，并展示了失去框架建设者对珊瑚礁环境的生态影响。

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