The Sturtian 'snowball' glaciation:: fire and ice
The Sturtian 'snowball' glaciation:: fire and ice
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DOI：
10.1016/s0012-821x(03)00197-3
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发表时间：
2003-06-15
影响因子：
5.3
通讯作者：
François, LM
中科院分区：
文献类型：
--
作者：
Goddéris, Y;Donnadieu, Y;François, LM
Sturtian '雪球'冰川作用（730马）是当代的Rodinia超大陆的错位。这种错位预示着并伴随着强烈的岩浆事件，包括825和755马之间的大型玄武岩省的发病。在这些岩浆事件中，最重要的是在780 Ma左右，在北纬30度附近的劳伦期岩浆区的开始。这些新鲜玄武岩区的存在增加了大陆表面的耐候性，导致通过风化增加了大气中二氧化碳的消耗，导致全球长期气候变冷。根据玄武岩岩性的最新风化规律和气候模型结果，我们表明，位于赤道地区（该省的风化和CO2的消耗受到最佳气候条件的促进）的6 x 10（6）km（2）玄武岩省的风化足以引发雪球冰川作用，假设扰动前PCO2值为280 ppmv。我们表明，劳伦的岩浆省可能是主要的罪魁祸首的启动Sturtian '雪球'冰川，因为劳伦的岩浆省内的赤道地区的冰川作用的时间漂移。(C)2003 Elsevier Science B.V.保留所有权利。
The Sturtian 'snowball' glaciation (730 Ma) is contemporary with the dislocation of the Rodinia supercontinent. This dislocation is heralded and accompanied by intense magmatic events, including the onset of large basaltic provinces between 825 and 755 Ma. Among these magmatic events, the most important one is the onset of a Laurentian magmatic province at 780 Ma around a latitude of 30degreesN. The presence of these fresh basaltic provinces increases the weatherability of the continental surfaces, resulting in an enhanced consumption of atmospheric CO2 through weathering, inducing a global long-term climatic cooling. Based on recent weathering laws for basaltic lithology and on climatic model results, we show that the weathering of a 6 x 10(6) km(2) basaltic province located within the equatorial region (where weathering of the province and consumption of CO2 are boosted by optimal climatic conditions) is sufficient to trigger a snowball glaciation, assuming a pre-perturbation PCO2 value of 280 ppmv. We show that the Laurentian magmatic province might be the main culprit for the initiation of the Sturtian 'snowball' glaciation, since the Laurentian magmatic province had drifted within the equatorial region by the time of the glaciation. (C) 2003 Elsevier Science B.V. All rights reserved.