Mantle convection modeling of the supercontinent cycle : Introversion, extroversion, or a combination?
Mantle convection modeling of the supercontinent cycle : Introversion, extroversion, or a combination?
复制标题
超大陆旋回的地幔对流模拟：内向、外向还是两者的结合？
DOI：
10.1016/j.gsf.2013.06.002
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发表时间：
2014
影响因子：
8.9
通讯作者：
Masaki Yoshida and M. Santosh
中科院分区：
文献类型：
--
作者：
Yamaoka;K.;Miyamachi;H.;Iguchi;M.;Watanabe;T.;Kunitomo;T.;Yakiwara;H. and Ikuta;R;山下太・福山英一・溝口一生・柳谷俊;初貝安弘;Masaki Yoshida and M. Santosh
大陆板块的周期性聚散，即超大陆旋回，与地幔对流和板块构造演化密切相关。超大陆的形成涉及复杂的“内向”（内部海洋的闭合）、“外向”（外部海洋的闭合）或这些过程的组合，将分散的大陆碎片结合在一起。数值模拟的最新发展和计算技术的进步使我们能够在类似地球的几何形状（即，3D球壳）。我们报告了一个三维地幔对流的数值模拟，结合漂移变形大陆，以评估超大陆过程中的一个现实的地幔对流制度。我们的研究结果表明，超大陆是由内向和外向过程的组合组装。小规模的热不均匀性占主导地位的深地幔对流在超大陆循环，虽然大规模的上涌羽流间歇性地起源于漂移的大陆和/或超大陆。
The periodic assembly and dispersal of continental fragments, referred to as the supercontinent cycle, bear close relation to the evolution of mantle convection and plate tectonics. Supercontinent formation involves complex processes of “introversion” (closure of interior oceans), “extroversion” (closure of exterior oceans), or a combination of these processes in uniting dispersed continental fragments. Recent developments in numerical modeling and advancements in computation techniques enable us to simulate Earth's mantle convection with drifting continents under realistic convection vigor and rheology in Earth-like geometry (i.e., 3D spherical-shell). We report a numerical simulation of 3D mantle convection, incorporating drifting deformable continents, to evaluate supercontinent processes in a realistic mantle convection regime. Our results show that supercontinents are assembled by a combination of introversion and extroversion processes. Small-scale thermal heterogeneity dominates deep mantle convection during the supercontinent cycle, although large-scale upwelling plumes intermittently originate under the drifting continents and/or the supercontinent.