四川江油渔洞子下三叠统飞仙关组巨鲕灰岩中疑似蓝细菌及早三叠世疑似蓝细菌的双幕式爆发

发布时间：2018-09-19 12:07

【摘要】：二叠纪末海洋生态环境的恶化导致海洋底栖生物的大灭绝及早三叠世蓝细菌的爆发,有关这一时期我国华南蓝细菌化石的报道主要来自早三叠世早期的微生物岩。四川江油渔洞子剖面下三叠统飞仙关组下部巨鲕灰岩中首次发现有丰富的疑似蓝细菌,在种类和结构上与以往所报道的蓝细菌有着明显区别。疑似蓝细菌在巨鲕内和围岩中的富集,表明巨鲕灰岩的成因与疑似蓝细菌的活动有关,与飞仙关组底部微生物岩在成因上有着密切联系,显示早三叠世早期在这一地区发生了疑似蓝细菌的双幕式爆发,同时,暗示着这一地区二叠纪-三叠纪之交至少发生了两次海洋环境恶化及动物灭绝事件。疑似蓝细菌的爆发性生长,对于海洋生态环境的修复和海洋含氧条件的改善,进而为早三叠世末、中三叠世的生物全面复苏、辐射有着重要意义。
[Abstract]:The deterioration of marine ecological environment at the end of Permian led to the extinction of marine benthos and the eruption of early Triassic cyanobacteria. The reports of cyanobacterial fossils in South China during this period are mainly from the early Triassic microbes. For the first time, abundant suspected cyanobacteria were found in the giant oolitic limestone of the lower part of the Triassic Feixianguan formation in the Yuyunzi section of Jiangyou River, Sichuan Province, which is obviously different from the previously reported cyanobacteria in species and structure. The enrichment of suspected cyanobacteria in giant oolitic rocks and surrounding rocks indicates that the genesis of giant oolitic limestone is related to the activity of suspected cyanobacteria and is closely related to the origin of microbe rocks at the bottom of the Feixianguan formation. The results show that a duplex outbreak of suspected cyanobacteria occurred in this area in the early Triassic, which implies that there were at least two marine environmental degradation and animal extinction events between Permian-Triassic in this area. The explosive growth of suspected cyanobacteria is of great significance to the restoration of marine ecological environment and the improvement of marine oxygen-containing conditions, and thus to the full recovery and radiation of organisms in the late early Triassic and the Middle Triassic.
【作者单位】：中国科学院南京地质古生物研究所;Fachbereich
【基金】：中国科学院战略性先导科技专项(B类)(XDB03010102);中国科学院"外国专家研究员"计划项目(2009Z2-7) 国家自然科学基金青年基金(41402016,41072008) 德国研究委员会课题(Wi725/26)联合资助
【分类号】：Q913

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