A research team led by Prof. Shen Yan'an from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS) conducted a systematic study of the interglacial stratigraphy in South China by means of high-precision sulfur and mercury isotope analyses.
and investigations, the team selected a drill core from the Datangpo Formation, spanning hundreds of meters, for geological, stratigraphic, and geochemical analyses. The study results indicate that during the initial stages of the"Snowball Earth" thawing, the chemical composition of seawater was primarily influenced by hydrothermal venting on the seafloor.
This finding indirectly reflects the fundamental differences between the ocean during the"Snowball Earth" period and a normal ocean. During that time, the exchange and circulation of substances among the ocean, atmosphere, and land were severely limited. The variations in non-mass-dependent mercury isotopes provide evidence for the intensification of volcanic activity during the deglaciation of the"Snowball Earth." In light of this finding, the research team proposed a new perspective that the rapid thawing of the"Snowball Earth" led to a sudden reduction in surface pressure, thereby triggering magmatic activity deep within the Earth and subsequent volcanic eruptions.
In addition, the temporal variations in sulfur isotopes demonstrate a gradual increase in sulfate concentration in interglacial seawater, indicating a progressive oxidation of the atmospheric and oceanic systems during that period. Considering the changes in atmospheric chemistry, a gradual decrease in
, and the progressive oxygenation of the oceans during the interglacial period, the team proposed that the environmental and climatic changes on the Earth's surface during the interglacial period promoted the evolution of early complex life forms.Menghan Li et al, Deglacial volcanism and reoxygenation in the aftermath of the Sturtian Snowball Earth,
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