论文部分内容阅读
新元古代冰期引起生物大量绝灭 ,大绝灭后环境如何重建、生物怎样复苏是演化古生物学研究的重要课题。对贵州铜仁坝黄、瓮安北斗山剖面和台江五河剖面南沱冰碛岩之上连续沉积的陡山沱组底部的“碳酸盐岩帽”中藻类化石进行系统研究 ,并结合古海洋环境地球化学研究结果 ,认为冰期后生态环境恢复很快 ,藻类快速复苏 ,但藻类分异度低。“碳酸盐岩帽”沉积结束 ,藻类进入衰退期 ,到了陡山沱中晚期 ,藻类又进入顶盛期。而藻类的复苏、衰退与古海洋环境的δ13C ,δCe,δEu异常有着密切关系
Neoproterozoic ice age caused a large number of extinction of organisms, how to rebuild the environment after the Great Extinction, how to recover the organism is an important issue in the evolution of paleontology. The algae fossils in the “carbonate cap” at the bottom of the Doushantuo Formation deposited continuously on the Tongduibahuang section of Guizhou Province, the Beidoushan section of the Weng’an section, and the Nantuo moraine rocks of the Wujiang section of the Taijiang River were systematically studied. According to the results of marine environmental geochemistry, the ecological environment recovered rapidly after the glacial period, and the algae recovered rapidly, but the algal species differentiation was low. Sedimentation of “carbonate rock caps” ended and algae entered a recession. By the middle and late Doushantuo, algae entered the top stage. The algae recovery, recession and the ancient marine environment δ13C, δCe, δEu anomalies are closely related