斯图尔特 "雪球地球 "冰川期的持续时间与洋中脊排气异常低有关

Geology Pub Date : 2024-02-07 DOI:10.1130/g51669.1
A. Dutkiewicz, A. Merdith, Alan S. Collins, Ben Mather, Lauren Ilano, S. Zahirovic, R. D. Müller
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摘要

斯图尔特 "雪球地球 "冰川期(约 717-661 Ma)被认为是地球历史上最极端的冰室气候时期。这次持续时间较长的全球冰川作用的确切诱因和滞留机制仍然模糊不清。争论最多的原因是约 718 Ma 富兰克林大火成岩的硅酸盐风化。718 Ma富兰克林大型火成岩带(LIP)的硅酸盐风化以及大陆弧长度和脱气的变化。现在,新一代两个独立的新近纪全板块构造模型使我们能够量化构造作用在启动和维持斯图尔特冰川作用中的作用。我们发现,在两个模型中,大陆弧长度从 850 Ma 到冰川结束都保持相对恒定,不太可能起作用。两个板块运动模式在预测罗迪尼亚断裂的时间和进程、大洋盆地年龄、大洋盆地深度、海平面演变和大洋中脊碳外流方面存在分歧。一种模式预测大洋中脊碳外流和大洋盆地体积驱动的海平面低于晚新生代冰川时期的海平面,而另一种模式预测排气和海平面超过晚白垩世温室气候时期的海平面。第二种模式排除了大冰川的可能性,而第一种模式则意味着斯图尔特冰川的触发因素可能是极低的MOR外流(∼9 Mt C/yr)和富兰克林LIP风化作用的结合。当硅酸盐风化作用明显减弱时,这种极低的外流可以维持57 m.y.的冰室状态,大气中的MOR CO2逐渐增加,再加上陆地火山活动,最终导致冰期的结束。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Duration of Sturtian “Snowball Earth” glaciation linked to exceptionally low mid-ocean ridge outgassing
The Sturtian “Snowball Earth” glaciation (ca. 717−661 Ma) is regarded as the most extreme interval of icehouse climate in Earth’s history. The exact trigger and sustention mechanisms for this long-lived global glaciation remain obscure. The most widely debated causes are silicate weathering of the ca. 718 Ma Franklin large igneous province (LIP) and changes in the length and degassing of continental arcs. A new generation of two independent Neoproterozoic full-plate tectonic models now allows us to quantify the role of tectonics in initiating and sustaining the Sturtian glaciation. We find that continental arc length remains relatively constant from 850 Ma until the end of the glaciation in both models and is unlikely to play a role. The two plate motion models diverge in their predictions of the timing and progression of Rodinia break-up, ocean-basin age, ocean-basement depth, sea-level evolution, and mid-ocean ridge (MOR) carbon outflux. One model predicts MOR outflux and ocean basin volume−driven sea level lower than during the Late Cenozoic glaciation, while the other predicts outgassing and sea level exceeding those of the Late Cretaceous hothouse climate. The second model would preclude a major glaciation, while the first model implies that the trigger for the Sturtian glaciation could have been a combination of an extremely low MOR outflux (∼9 Mt C/yr) and Franklin LIP weathering. Such minimal outflux could have maintained an icehouse state for 57 m.y. when silicate weathering was markedly reduced, with a gradual build-up of MOR CO2 in the atmosphere paired with terrestrial volcanism leading to its termination.
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