Meteorological influences on marine chemistry during the Cryogenian Sturtian glaciation

IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2024-11-03 DOI:10.1016/j.palaeo.2024.112573
Shengxian Zhu , Xianguo Lang , Kun Zhao , Chaochao Xing , Mingcai Hou
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Abstract

The Cryogenian Sturtian glaciation (717–660 Ma) represents the most extreme icehouse climate condition in Earth's history, during which the global ocean was completely frozen, known as the Snowball Earth event. It is widely accepted that such a global freeze could result in persistent anoxic and ferruginous marine conditions. Here, we report on a Sturtian-aged storm-prone shelf (ca. 678 Ma) in South China, characterized by dynamic fluctuations in marine redox conditions. We observe a sequence of transitions from euxinic (anoxic and H2S-enriched) to ferruginous (anoxic but iron-rich), and finally to oxic conditions on this shelf. The euxinic deposits frequently exhibit hummocky/swaley cross-bedding structures (HCS/SCS) and contain high levels of authigenic francolite. In contrast, the ferruginous interval displays rare occurrences of HCS/SCS and lower amounts of authigenic francolite. Conversely, the oxic deposits show no evidence of storm activity. These results suggest that the strong storm waves played a crucial role in facilitating the upwelling of phosphorus-enriched deep water, thereby creating favorable nutrient conditions that stimulated primary productivity and microbial sulfate reduction (MSR). These findings underscore the significant influence of local meteorological conditions, particularly storm activity, on marine redox changes. Furthermore, dynamic storm-induced currents combined with marine redox conditions indicate the presence of an unfrozen sea with active biogeochemical cycles during the Cryogenian Sturtian glaciation. This study confirms the complex interactions among meteorology, oceanography, and Earth's climate system during extreme glacial events.
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低碳史图尔特冰川时期气象对海洋化学的影响
冰河时期(717-660 Ma)代表了地球历史上最极端的冰室气候条件,在此期间全球海洋完全冻结,被称为 "雪球地球 "事件。人们普遍认为,这样的全球冰冻会导致持续的缺氧和铁锈海洋条件。在此,我们报告了华南一个斯都尔纪风暴易发大陆架(约 678 Ma)的情况,其特征是海洋氧化还原条件的动态波动。我们观察到该大陆架从缺氧(缺氧和富含 H2S)到铁锈色(缺氧但富含铁),最后到缺氧条件的一系列转变。缺氧沉积物经常呈现驼峰状/漩涡状交叉层理结构(HCS/SCS),并含有大量自生钫石。与此相反,铁砾岩层间很少出现驼峰状/漩涡状交叉层结构,自生钫石的含量也较低。相反,含氧沉积物则没有风暴活动的迹象。这些结果表明,强烈的风暴潮在促进富磷深水上涌方面发挥了关键作用,从而创造了有利的营养条件,刺激了初级生产力和微生物硫酸盐还原(MSR)。这些发现强调了当地气象条件,特别是风暴活动对海洋氧化还原变化的重要影响。此外,由风暴引起的动态海流与海洋氧化还原条件相结合,表明在低冰期的斯图尔特冰川中存在着一个生物地球化学循环活跃的不冻海。这项研究证实了极端冰川事件期间气象学、海洋学和地球气候系统之间复杂的相互作用。
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来源期刊
CiteScore
5.90
自引率
10.00%
发文量
398
审稿时长
3.8 months
期刊介绍: Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.
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