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虽然二叠系-三叠系界线附近的微生物岩是研究生态环境转折期海洋环境的热点素材,但以往所发现的实例都赋存于显生宙最大灭绝事件界线之上,还未报道过位于灭绝界线之下的微生物岩。川东北地区长兴组上部发育骨架礁层位之上的微生物丘,其中以尖山微生物丘最为典型,具三个生长旋回。根据微生物丘地层中所含牙形刺,和有孔虫,其时代为长兴晚期,处于大灭绝界线之下,其顶部距Hindeodus parvus带7.5m。碳同位素及微量元素分析揭示,从晚二叠世晚期开始,海洋生态环境条件的幕式不稳定性就已经显现并持续发展,导致生物危机也呈多阶段性特征。川东北晚二叠世微生物丘记录见证了重大地质转折期将至时生物与环境的相互作用关系。
Although the microbial biolites near the Permian-Triassic boundary are hot spots for the study of the marine environment during the turning-point of the ecological environment, all the previously discovered examples have existed above the boundary of the Maximal Extinction Event of the Phanerozoic and have not been reported. Microbial rocks beneath the extinction boundary. In the upper part of the Changxing Formation in northeastern Sichuan, there are microbial mounds on the top of the skeleton reefs, of which the most typical is the Jianshan microbial mass, with three growth cycles. Based on the conodonts contained in the microbial community and the foraminifera, its age was late in Changxing and was below the line of mass extinction with a top of 7.5 m from Hindeodus parvus. Analysis of carbon isotopes and trace elements revealed that since the late Late Permian, the unsteadiness of the oceanic ecotope has appeared and continued to develop, resulting in a multi-stage biological crisis. The records of the Late Permian microbial ducts in northeastern Sichuan Province have witnessed the interaction between biological and environmental factors during the period of major geological transition.