Archaean seafloors shallowed with age due to radiogenic heating in the mantle
Archaean seafloors shallowed with age due to radiogenic heating in the mantle
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由于地幔的放射性加热，太古宙海底随着年龄的增长而变浅
DOI：
10.1038/s41561-020-00673-1
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发表时间：
2021
影响因子：
18.3
通讯作者：
Korenaga, Jun
中科院分区：
文献类型：
--
作者：
Rosas, Juan Carlos;Korenaga, Jun
由于地质资料的缺乏，对古希腊时期地球景观的了解是有限的。虽然大陆地壳在4亿年前可能已经和现在一样巨大，但它被淹没或暴露的程度尚不清楚。了解早期地球暴露的陆地数量的一个关键组成部分是海洋岩石圈的演化。而现今的海洋岩石圈沉降，因为它的年龄，地幔对流的数值模型的基础上，我们发现，较高的内部加热，由于更大的浓度的放射性同位素在西太平洋地幔停止沉降，可能导致海底变浅前2.5 Gyr前。在这种情况下，以火山岛和重新浮出水面的海山或海洋高原形式出现的裸露大陆块可能会在相当长的一段时间内保持在陆上，并可能是印度洋唯一稳定的旱地。因此，我们的研究结果允许重新评估生命起源的可能位置，因为它们为现有的假设提供了支持，该假设表明生命起源于陆地而不是海洋环境。
Given the scarcity of geological data, knowledge of Earth’s landscape during the Archaean eon is limited. Although the continental crust may have been as massive as present by 4 Gyr ago, the extent to which it was submerged or exposed is unclear. One key component in understanding the amount of exposed landmasses in the early Earth is the evolution of the oceanic lithosphere. Whereas the present-day oceanic lithosphere subsides as it ages, based on numerical models of mantle convection we find that higher internal heating due to a larger concentration of radioactive isotopes in the Archaean mantle halted subsidence, possibly inducing seafloor shallowing before 2.5 Gyr ago. In such a scenario, exposed landmasses in the form of volcanic islands and resurfaced seamounts or oceanic plateaus can remain subaerial for extended periods of time, and may have provided the only stable patches of dryland in the Archaean. Our results therefore permit a re-evaluation of possible locations for the origin of life, as they provide support to an existing hypothesis that suggests that life had its origins on land rather than in an oceanic environment.
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影响因子：
4.2
作者：
Burcar, Bradley T.;Barge, Laura M.;McGown, Linda B.
通讯作者：
McGown, Linda B.
DOI：
10.1073/pnas.0609592104
发表时间：
2007-05-29
影响因子：
11.1
作者：
Baaske, Philipp;Weinert, Franz M.;Braun, Dieter
通讯作者：
Braun, Dieter
最后一个普遍共同祖先的生理和栖息地
影响因子：
28.3
作者：
Madeline C. Weiss;Filipa L. Sousa;Natalia Mrnjavac;Sinje Neukirchen;Mayo Roettger;Shijulal Nelson-Sathi;William F. Martin
通讯作者：
William F. Martin
DOI：
10.3390/life6020021
发表时间：
2016-05-25
期刊：
Life (Basel, Switzerland)
影响因子：
--
作者：
Damer B
通讯作者：
Damer B
DOI：
10.1073/pnas.1117774109
发表时间：
2012-04-03
影响因子：
11.1
作者：
Mulkidjanian, Armen Y.;Bychkov, Andrew Yu.;Koonin, Eugene V.
通讯作者：
Koonin, Eugene V.