International Journal of Marine Science, 2024, Vol.14, No.2, 130-133 http://www.aquapublisher.com/index.php/ijms 132 Figure 5 Global correlation of the EPME However, the limitations of the CA-ID-TIMS technique should also be considered. The selection and processing of samples can affect the geochronological results, particularly when mixed zircons from different sources are present in the samples. Although this technique can provide extremely high dating precision, it requires very high standards for sample quality and condition, which may make it challenging to apply in regions with incomplete stratigraphic records or poor preservation conditions. 3 Review of Research Findings By conducting high-precision zircon U-Pb geochronological analyses on tuffs from various strata in southwest China, this study revealed a significant temporal discrepancy between terrestrial and marine extinction events. The analysis results indicate that the onset of terrestrial extinction exhibits significant asynchrony across different latitudes and generally occurs later than the onset of marine extinction. Overall, terrestrial extinction began in high-latitude regions and then gradually expanded to lower latitudes over nearly a million years. This time span, compared to marine extinction events, shows that terrestrial ecosystems responded more slowly and diffusely to environmental changes. 4 Conclusions and Significance This study, through high-precision zircon U-Pb geochronological analyses of tuff samples from the strata of southwest China, has revealed a temporal mismatch and geographic variability between terrestrial and marine extinction events. This finding holds significant scientific importance. It challenges the traditional viewpoint that the end-Permian mass extinction occurred synchronously on land and in the oceans, offering readers a new perspective on the most severe extinction event in Earth's history. The results emphasize the importance of considering geographic and latitudinal factors in global catastrophe studies, as these factors significantly influence how biotic communities respond to and recover from environmental changes. 5 Original Text Reading Wu Q., Zhang H., Ramezani J., Zhang F.F., Erwin D.H., Feng Z., Shao L.Y., Cai Y.F., Zhang S.H., Xu Y.G., and Shen S.Z., 2024, The terrestrial end-Permian mass extinction in the paleotropics postdates the marine extinction, Sci. Adv., 10(5): eadi7284(2024). DOI:10.1126/sciadv.adi7284
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