Abstract Three major late Neoproterozoic global cryochrons mark the coldest climate state in Earth history, with glaciers covering most, if not all, continents. However, the terrestrial paleosurface temperature differential between cryochron and nonglacial interlude is unknown. Time-equivalent Cryogenian and Ediacaran sedimentary successions from South China and Oman show multiple negative excursions of the corrected values of their chemical index of alteration (CIAcorr). These excursions reflect climate cooling and correlate with the Sturtian, Marinoan and Gaskiers cryochrons. Based on the τNa-MAT transfer function (sodium chemical depletion index-mean annual temperature), we estimate the temperature differential between Cryogenian cryochron and nonglacial interlude reached 20 ± 5.4 ℃ at around 30° paleolatitude, and 12 ± 5.4 ℃ temperature difference between the Ediacaran cryochron and nonglacial interlude near the equator. The fluctuation of CIAcorr and MAT trends within individual cryochrons likely indicate cold-warm climate cycling during the Cryogenian cryochron.

中文翻译：

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量化华南南华盆地新元古代低温-非冰期间的温度变化

摘要 三个主要的晚新元古代全球冰冻年代标志着地球历史上最冷的气候状态，冰川覆盖了大部分（如果不是全部）大陆。然而，冰冻期和非冰期间插之间的陆地古地表温度差异是未知的。来自华南和阿曼的时间等效低温纪和埃迪卡拉纪沉积序列显示其化学蚀变指数 (CIAcorr) 的校正值出现多次负偏移。这些远足反映了气候变冷，并与 Sturtian、Marinoan 和 Gaskiers 低温计时相关。基于τNa-MAT传递函数（钠化学耗竭指数-年平均温度），我们估计在古纬度30°左右的Cryogeniancryochron和非冰期间断之间的温差达到20±5.4℃，12±5℃。赤道附近埃迪卡拉纪冰期与非冰期间断之间的温差为 4 ℃。CIAcorr 和 MAT 趋势在各个低温周期内的波动可能表明低温周期内的冷暖气候循环。