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自W.Alvarez首次利用铱异常解释白垩-第三纪撞击事件及生物大量绝灭以来,在全球已发现了70处以上的白垩-第三系Ni-Ir异常.而比白垩第三纪生物绝灭更大的二叠-三叠纪之交是否也发生过类似的事件,引起了人们的重视
More than 70 Chalky-Tertiary Ni-Ir anomalies have been discovered worldwide since W. Alvarez first used the iridium anomalous interpretation of the Cretaceous-Tertiary impact events and extensive extinction of organisms. Whether the occurrence of a similar event occurred at the turn of the larger Permian-Triassic period has aroused people’s attention