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Major shoreline retreat and sediment starvation following Snowball Earth

机译：在雪球地球之后的主要海岸线撤退和沉积物饥饿

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While cap dolostones are integral to the Snowball Earth hypothesis, the current depositional model does not account for multiple geological observations. Here we propose a model that rationalises palaeomagnetic, sequence-stratigraphic and sedimentological data and supports rapid deglaciation with protracted cap dolostone precipitation. The Snowball Earth hypothesis posits that a runaway ice-albedo can explain the climate paradox of Neoproterozoic glacial deposits occurring at low palaeolatitudes. This scenario invokes volcanic degassing to increase atmospheric greenhouse gases to a critical threshold that overcomes the albedo effect and brings the planet back from the ice-covered state. Once this occurs, Earth should shift rapidly from a snowball to an extreme greenhouse. However, cap dolostone units overlying glacial sediments, typically interpreted as transgressive deposits, exhibit multiple magnetic reversals indicating they accumulated in >10(5) years. By reviewing modern post-glacial systems, sequence stratigraphic concepts and principles of sedimentology, we suggest that cap dolostones are not restricted to the transgression but rather represent sediment starvation following a major landward shoreline migration associated with the demise of Snowball Earth. Thus, the duration in which cap dolostone accumulated is not directly coupled to the timescale of the Snowball Earth deglaciation.
机译：虽然盖帽模床是对雪球地球假设的一体化，但目前的沉积模型不考虑多种地质观察。在这里，我们提出了一种模型，该模型是古物磁，序列 - 地层和沉积学数据，并支持快速扩大与延伸的帽杜胆酮沉淀。雪球地球假设假设，失控的冰-Albedo可以解释在低古地球菌中发生的新蛋白质冰川沉积物的气候悖论。这种情况调用火山岩脱气，以增加大气温室气体，以克服反玻璃效应的临界阈值，并从冰盖状态下带来行星。一旦发生这种情况，地球应该从雪球迅速转移到极端温室。然而，覆盖冰川沉积物的盖子Dolostone单元通常被解释为泛沉积，表现出多种磁性逆转，表明它们累积> 10（5）年。通过审查现代冰川系统，序列地层概念和沉积物原则，我们建议帽子帽子不仅限于违规，而且表示与雪球地球消亡相关的主要陆地海岸线移民后沉积物饥饿。因此，盖子Dolostone累积的持续时间没有直接耦合到雪球地球扩展的时间尺度。

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  • 来源
    《Terra Nova》 |2019年第6期|共8页
  • 作者

    Nordsvan Adam R.; Barham Milo; Cox Grant; Kirscher Uwe; Mitchell Ross N.;

  • 作者单位

    Curtin Univ Ctr Excellence Core Crust Fluid Syst CCFS Inst Geosci Res TIGeR Earth Dynam Res Grp Australian Res Council Sch Earth &

    Planetary Sci Perth WA 6845 Australia;

    Curtin Univ Ctr Explorat Targeting Curtin Node Sch Earth &

    Planetary Sci Perth WA Australia;

    Curtin Univ Ctr Excellence Core Crust Fluid Syst CCFS Inst Geosci Res TIGeR Earth Dynam Res Grp Australian Res Council Sch Earth &

    Planetary Sci Perth WA 6845 Australia;

    Curtin Univ Ctr Excellence Core Crust Fluid Syst CCFS Inst Geosci Res TIGeR Earth Dynam Res Grp Australian Res Council Sch Earth &

    Planetary Sci Perth WA 6845 Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学、地球科学;
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