Current synthesis of the penultimate icehouse and its imprint on the Upper Devonian through Permian stratigraphic record
Current synthesis of the penultimate icehouse and its imprint on the Upper Devonian through Permian stratigraphic record
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DOI：
10.1144/sp512-2021-124
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发表时间：
2021-09
期刊：
影响因子：
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通讯作者：
I. Montañez
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文献类型：
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作者：
I. Montañez
摘要冰室是地球上不太常见的气候状态，因此值得注意的是，最长寿的（c。370至260马），可能是最广泛和最激烈的冰库时期跨越石炭纪。中高纬度的冰川沉积物揭示了一个动态的冰川-冰消历史，在冰川作用的顶点，多个冰中心和可能的横贯大陆的冰盖的冰增冰减。新的高精度U-Pb年龄证实了一个假设的西向东的冰川通过冰库的进展，但揭示了它的消亡发生了一系列同步和广泛的冰川消退。动态的冰川历史，沿着地球系统成分的反复扰动，存档在低纬度地层记录中，揭示了与新生代冰库的相似之处。进一步评估冰库期间气候，海洋和生物变化之间的阶段性需要额外的年代地层约束。天文年代学允许破译时间，在高分辨率，在晚古生代记录已被证明在深水和静水沉积。然而，在低纬度循环演替中对天文强迫进行严格测试，通过推断的冰川活动与高纬度的冰川形成记录有直接联系，这将需要一种综合方法，将新技术与进一步优化和额外的独立年龄限制结合起来，因为与浅海到陆地记录有关的挑战。
Abstract Icehouses are the less common climate state on Earth, and thus it is notable that the longest-lived (c. 370 to 260 Ma) and possibly most extensive and intense of icehouse periods spanned the Carboniferous Period. Mid- to high-latitude glaciogenic deposits reveal a dynamic glaciation–deglaciation history with ice waxing and waning from multiple ice centres and possible transcontinental ice sheets during the apex of glaciation. New high-precision U–Pb ages confirm a hypothesized west-to-east progression of glaciation through the icehouse, but reveal that its demise occurred as a series of synchronous and widespread deglaciations. The dynamic glaciation history, along with repeated perturbations to Earth System components, are archived in the low-latitude stratigraphic record, revealing similarities to the Cenozoic icehouse. Further assessing the phasing between climate, oceanographic, and biotic changes during the icehouse requires additional chronostratigraphic constraints. Astrochronology permits the deciphering of time, at high resolution, in the late Paleozoic record as has been demonstrated in deep- and quiet-water deposits. Rigorous testing for astronomical forcing in low-latitude cyclothemic successions, which have a direct link to higher-latitude glaciogenic records through inferred glacioeustasy, however, will require a comprehensive approach that integrates new techniques with further optimization and additional independent age constraints given challenges associated with shallow-marine to terrestrial records.