On the Yield Strength of Oceanic Lithosphere
On the Yield Strength of Oceanic Lithosphere
复制标题
论大洋岩石圈的屈服强度
DOI：
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复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
S. Karato
中科院分区：
文献类型：
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作者：
C. Jain;J. Korenaga;S. Karato
海洋岩石圈的屈服强度决定了类地行星地幔对流的模式，而橄榄石聚集体的低温塑性通常被认为控制着岩石圈最坚硬部分的塑性流变学。由于到目前为止，针对这种机制提出的流动定律表现出非平凡的差异，我们重新审视了Mei等人（2010）最近的高压变形数据，并采用基于马尔可夫链蒙特卡罗采样的综合反演方法。我们的反演结果表明，相关的流动规律参数的不确定性是大大大于以前认为的。根据流动定律参数的选择，海洋岩石圈的强度会有很大的不同，对地球上板块构造的起源有不同的影响。为了减少流动定律的模糊性，我们建议，重要的是要建立一个理论基础，以估计宏观应力在高压实验，也更好地利用海洋地球物理观测。
The yield strength of oceanic lithosphere determines the mode of mantle convection in a terrestrial planet, and low‐temperature plasticity in olivine aggregates is generally believed to govern the plastic rheology of the stiffest part of lithosphere. Because, so far, proposed flow laws for this mechanism exhibit nontrivial discrepancies, we revisit the recent high‐pressure deformation data of Mei et al. (2010) with a comprehensive inversion approach based on Markov chain Monte Carlo sampling. Our inversion results indicate that the uncertainty of the relevant flow law parameters is considerably greater than previously thought. Depending on the choice of flow law parameters, the strength of oceanic lithosphere would vary substantially, carrying different implications for the origin of plate tectonics on Earth. To reduce the flow law ambiguity, we suggest that it is important to establish a theoretical basis for estimating macroscopic stress in high‐pressure experiments and also to better utilize marine geophysical observations.
影响因子：
3.9
作者：
Zhong, Shijie;Watts, A. B.
通讯作者：
Watts, A. B.