Volcano activities may be the background condition of Baiji Biostatic Extinction

Newspaper Nanjing, July 22 (Reporter Su Yan, Correspondent Ji Zunyu) At the end of the Baiji period of about 66 million years ago, the fifth biological extinction incident in the universe had occurred. The ecological structure of the earth has ended the dinosaur era with more than 150 million years. Who has caused the fifth biostatic extinction and meteorite impact? At present, the academic community is still unremitting the cause of the great extinction. Among them, the eruption of Indian Dangan Xuanwu Rock led to one of the mainstream views.

About 150,000 to 300,000 years before the occurrence of great extinction, Dangan's fire into a large amount of greenhouse gases in the form of invasion and eruption, which may cause the global warming of 2 ° C to 5 ° C. At the end of the period, warming incident. However, at present, the academic community has a very limited understanding of the incident, especially whether the records related to the first eruption of the German volcano can be discovered in Lu Xiang deposits? How does Marstripte's end -of -term warming incident affect the land ecosystem? These two issues have always lacked key evidence.

Recently, Li Sha, deputy researcher of the Nanjing Institute of Geology, Chinese Academy of Sciences, Wang Bo, researcher Wang Bo, researcher Zhang Haichun, researcher Wang Qifei and Tianjin University professor Chen Yibin, Chinese University of Geosciences (Beijing) Wan Xiaozheng, etc. The two -bit drilled rock -hearted data of the near -system line, based on high -precision biological stratigraphic, ancient ecological and gelastic methods, detailed the records of the Degan volcano erupted in East Asia and the response of the lake environment and the biological group on this incident. The results of the research provided strong evidence for the coupling relationship between Marstript's end -of -term warming incident and Degan Volcano, and showed that the warming incident also had a significant impact on the lake environment and biological groups. Relevant research results were published online on July 18th in the well -known international journal "Geology".

Because the volcanic eruption releases a large amount of mercury can be recorded in the strata, mercury records are widely used as tracers for volcanic activity. The two drilling samples studied in this time showed strong mercury enrichment during the At the end of the Marstript's end -of -term warming incident before the Baiya/Ancient Rearning Boundary, which showed the direct volcanic emissions.

In order to identify the influence of the Degan volcanic activity on the environment and biological groups, the research team also conducted carbon isotonophyte and paleontology research. The Jiaolai Basin organic carbon isotopes and Hepingi Basin inorganic carbon isotopes occurred at the same time, indicating that the main pulse of Degan's fire into the province of Rock province had a huge impact on mercury and global carbon cycle. The two lake biological groups also have obvious response to the warming incident. The rotation and mega -shaped species of the Hepingi Basin of the Jiaolai Basin are obvious, and the biodiversity has increased. In the ocean, the phenomenon of floating pores has some extinction, dwarf, and disaster species. Essence

The research results show that the German volcanic activity makes the earth at a relatively warm climatic condition, and this warming may make the global biological earth chemical cycle closer to the critical point of out of control of the greenhouse environment. This may be the background condition of the great extinction at the end of the Baiji Period. "The results of the research provide new evidence for us to understand the relationship between volcanic carbon emissions and greenhouse earth, and also provide a reference for understanding the impact of global warming on the environment and biological groups of the world today." Li Sha said.

【Edit: Fangjialiang】

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