Mariana-type ophiolites constrain the establishment of modern plate tectonic regime during Gondwana assembly.
Mariana-type ophiolites constrain the establishment of modern plate tectonic regime during Gondwana assembly.
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马里亚纳型蛇绿岩制约冈瓦纳组装过程中现代板块构造体制的建立
DOI：
10.1038/s41467-021-24422-z
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发表时间：
2021-07-07
影响因子：
16.6
通讯作者：
Wang P
中科院分区：
文献类型：
--
作者：
Yao J;Cawood PA;Zhao G;Han Y;Xia X;Liu Q;Wang P
马里亚纳型大洋俯冲带的启动需要流变性强的大洋岩石圈，它是通过地球地幔的长期冷却而发展起来的。本文报道了西藏北方一条518 Ma的马里亚纳型俯冲起始蛇绿岩，沿着地球历史上类似蛇绿岩的形成，为早寒武世现代板块构造体制的建立提供了证据。蛇绿岩形成于古特提斯洋俯冲的初始阶段，与冈瓦纳大陆南部和西部边缘的板块回滚沿着。530-520 Ma。这种全球构造重组和现代板块构造体制的建立可能是由地球的长期冷却控制的，并由冈瓦纳大陆组装期间形成的广泛山脉的广泛表面侵蚀所产生的沉积物对俯冲带的润滑作用增强所促进。这一时间也与气候和地表代用指标中记录的极端事件相对应，这些事件预示着当代地球的形成。本文将马里亚纳型蛇绿岩的发现置于全球构造重组的框架内。530-520 Ma。类似的蛇绿岩，加上其他地质和化学代理，新限制了现代板块构造建立的时间，沿着它与表征当代地球的表面变化的联系。
Initiation of Mariana-type oceanic subduction zones requires rheologically strong oceanic lithosphere, which developed through secular cooling of Earth’s mantle. Here, we report a 518 Ma Mariana-type subduction initiation ophiolite from northern Tibet, which, along with compilation of similar ophiolites through Earth history, argues for the establishment of the modern plate tectonic regime by the early Cambrian. The ophiolite was formed during the subduction initiation of the Proto-Tethys Ocean that coincided with slab roll-back along the southern and western Gondwana margins at ca. 530-520 Ma. This global tectonic re-organization and the establishment of modern plate tectonic regime was likely controlled by secular cooling of the Earth, and facilitated by enhanced lubrication of subduction zones by sediments derived from widespread surface erosion of the extensive mountain ranges formed during Gondwana assembly. This time also corresponds to extreme events recorded in climate and surface proxies that herald formation of the contemporary Earth. This paper placed the identified Mariana type ophiolite within a global tectonic re-organization at ca. 530-520 Ma. Similar ophiolites, together with other geological and chemical proxies, newly constrained the timing of establishment of modern plate tectonics, along with its links to surficial changes that characterize the contemporary Earth.
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影响因子：
18.3
作者：
Campbell, Ian H.;Allen, Charlotte M.
通讯作者：
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影响因子：
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作者：
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