Ediacaran時期曾發生Marinoan 和Gaskiers兩次冰雪覆蓋全球的雪球地球事件，由於溫室氣體濃度上升所引發的超級溫室效應導致冰期結束。本研究主要透過甕安陡山沱層碳酸鹽中硼同位素比值(δ11B)，探討新元古代超級溫室效應條件下的海水的pH值與pCO2。本研究改良碳酸鹽相序列萃取方法，排除因混入其他礦物相所導致的硼同位素變化(7‰)。建立橫跨Ediacaran時期，接近一億年中國揚子盆地陡山沱地層完整的碳酸鹽δ11B紀錄(-5.7‰ 到8.9‰)。Marinoan 冰期結束後的地層中，發現全球性δ11B負偏移，本研究認為是融冰時大量陸源沉積物輸入，導致陸棚區域海水B濃度與δ11B顯著改變。通過濃度的變化，可評估陸源貢獻與環境海水δ11B，並將此應用於海水pH值計算。過去Ediacaran時期海水的δ11B被估為定值，各研究的估值差異對pH估算產生顯著影響。本研究不僅排除人為估值差異所導致的pH誤差，更同時考慮陸源通量改變對海水δ11B與pH計算的影響，大幅調整pH值與pCO2的估算方式與結果。研究表明Marinoan結束時海水pH值約 7.76; pCO2 約830 ppm，此結果明顯低於過去的推估值(90,000 ppm)。 此次的δ11B負偏移，是受海水酸化與陸源通量(低δ11B)增加共同影響。超級溫室效應伴隨著冰雪消融與與全球海水面逐漸上升，使沉積環境的陸源通量減少，結束此次負偏移。第二次δ11B負偏移出現在Gaskiers 冰期結束，此時全球各地Ediacaran生物群大量出現，本研究在樣品中發現疑似Ediacaran生物群的生物化石，並估算當時pH值約6.69， pCO2約12,000 ppm。比起過去研究超級溫室效應主要聚焦的Marinoan，Gaskiers時期具有更高的pCO2。 本研究以δ11B、海水pH值、海水面變化與陸源風化通量驗證雪球地球假說，並提供冰雪消融時相對低的pCO2新證據。改變過去對於超級溫室效應的認知。

We investigated the boron isotope of the carbonate fractions in the Doushantuo Formation to evaluate the seawater pH and partial pressures of atmospheric CO2 under ultra-greenhouse conditions in the Neoproterozoic Era. The δ11B values from the Chuanyandong section were ranged from -5.7 to 8.9‰, with a negative δ11B excursion (11.5‰) during the Marinoan deglacial period. The global and synchronous δ11B offset were intercepted in global ocean acidification events in previous studies. The δ11B and 1/[B] values showed a good correlation, and we suggested the δ11B offset was also significantly influenced by an increase in terrigenous weathering. We modified the traditional method to precisely estimate ocean pH from the δ11B. We excluded the pH error caused by terrigenous weathering and the artificial estimation δ11B of Neoproterozoic oceans. We re-evaluate the pH of seawater and pCO2 in the aftermath of the Marinoan glaciation, which were estimated to be 7.76 and 830 p.p.m.v respectively. These pCO2 values are much lower than those reported in previous studies. In the aftermath of the Gaskiers glaciation with the Weng'an biota, the lowest pH was 6.69, and the pCO2 was 12,000 p.p.m.v. In this study, we provide new evidence and relatively low pCO2 estimates for the Snowball Earth hypothesis.

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