Effects of various lithospheric yield stresses and different mantle‐heating modes on the breakup of the Pangea supercontinent
Effects of various lithospheric yield stresses and different mantle‐heating modes on the breakup of the Pangea supercontinent
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DOI：
10.1002/2014gl060023
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发表时间：
2014-05
影响因子：
5.2
通讯作者：
Masaki Yoshida
中科院分区：
文献类型：
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作者：
Masaki Yoshida
对三维球形地幔对流进行了数值模拟，以研究不同岩石圈屈服应力和两种不同地幔加热模式（即，混合加热从底部和内部和纯粹的内部加热）的泛古超大陆的分裂和随后的大陆漂移在过去的200万年。结果表明，大陆裂解和大陆漂移是在两种不同加热方式的地幔对流模型中完成的。这意味着来自核幔边界的活跃上涌羽流并不一定是泛古陆分裂所必需的。此外，我发现，大陆分裂只有在选择一个中等值的屈服应力（~120 MPa）时才能实现。在本研究中得到的屈服应力的界限将有可能使自洽重建大陆分裂和漂移以及伴随的模式地幔对流自200 Ma以来。
Numerical simulations of three‐dimensional spherical mantle convection were performed to investigate the effects of various lithospheric yield stresses and two different mantle‐heating modes (i.e., mixed heating from the bottom and interior and purely internal heating) on the breakup of the Pangea supercontinent and the subsequent continental drift for the past 200 Myr. Results show that the continental breakup and subsequent continental drift are accomplished in mantle convection models with two different heating modes. This implies that active upwelling plumes from the core‐mantle boundary are not necessarily required for the breakup of Pangea. In addition, I found that the continental breakup is only realized when choosing a moderate value of the yield stress (~120 MPa). The bound on the yield stress derived in the present study will potentially enable the self‐consistent reconstruction of continental breakup and drift as well as the accompanying pattern on mantle convection since 200 Ma.