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首页> 外文期刊>Chinese science bulletin >Filamentous cyanobacteria fossils and their significance in the Permian-Triassic boundary section at Laolongdong, Chongqing
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Filamentous cyanobacteria fossils and their significance in the Permian-Triassic boundary section at Laolongdong, Chongqing

机译：重庆老龙洞二叠系-三叠系界线中的丝状蓝藻化石及其意义

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摘要

The microbial communities blooming immediately after the end-Permian mass extinction represent abnormally extreme environments, and vary in different areas. In this study, filamentous cyanobacterial biota was found in the strata after the extinction in the famous Permian-Triassic boundary section at Laolongdong, Chongqing, southwest China. In thin sections, the filamentous cyanobacterial fossils are below 1 mm in length, and generally taper to one end, with the widest diameter up to 0.08 mm. Some of them are curved, indicating that they are soft in life. Their walls are composed of cryptocrystalline to microcrystalline calcites. The filaments have round cross section, and are internally filled with micrites and fine sparry calcites, which indicate that the filaments are originally empty. They are randomly distributed in the rocks, but in some places, they tend to be distributed in radial pattern. The filamentous organisms are morphologically similar to Rivularia of Rivulariaceae, Cyanobacteria Phylum, but with calcified sheaths, and are tentatively regarded as an indeterminate new species in Rivularia: Rivularia sp. Cyanobacteria are photosynthetic autotrophic, and can survive in dysoxic condition. The blooming of this organism and the absence of other organisms may indicate that the environment was oxygendeficient and shallow, since this photosynthetic autotrophic organism needed to live within photic zone.
机译：二叠纪末大灭绝后立即开花的微生物群落代表异常的极端环境，并且在不同区域变化。在这项研究中，在重庆西南老龙洞著名的二叠纪-三叠纪界线段灭绝后的地层中发现了丝状蓝细菌群落。在较薄的部分中，丝状蓝细菌化石的长度在1毫米以下，通常在一端逐渐变细，最宽的直径可达0.08毫米。其中一些是弯曲的，表明它们的生活柔软。它们的壁由隐晶到微晶方解石组成。长丝的横截面是圆形的，内部充满了微晶石和细小的方解石，这表明长丝本来是空的。它们随机分布在岩石中，但在某些地方，它们倾向于呈放射状分布。丝状生物在形态上与Rivulariace科的Rivularia，蓝藻门藻（Cyanobacteria Phylum）相似，但是具有钙化的鞘，并且暂时被认为是Rivularia的一个不确定的新物种：Rivularia sp。蓝细菌是光合自养的，可以在缺氧条件下生存。该生物的开花和其他生物的缺失可能表明该环境缺氧且较浅，因为这种光合自养生物需要生活在光合区内。

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