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首页> 外文期刊>Geochemistry, geophysics, geosystems >Toward the reconciliation of seismological and petrological perspectives on oceanic lithosphere heterogeneity
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Toward the reconciliation of seismological and petrological perspectives on oceanic lithosphere heterogeneity

机译：寻求地震岩石学对海洋岩石圈非均质性观点的调和

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The character of the high-frequency seismic phases Po and So, observed after propagation for long distances in the oceanic lithosphere, requires the presence of scattering from complex structure in 3D. Current models use stochastic representations of seismic structure in the oceanic lithosphere. The observations are compatible with quasi-laminate features with horizontal correlation length around 10 km and vertical correlation length 0.5 km, with a uniform level of about 2% variation through the full thickness of the lithosphere. Such structures are difficult to explain with petrological models, which would favor stronger heterogeneity at the base of the lithosphere associated with underplating from frozen melts. Petrological evidence mostly points to smaller-scale features than suggested by seismology. The models from the different fields have been derived independently, with various levels of simplification. Fortunately, it is possible to gently modify the seismological model toward stronger basal heterogeneity, but there remains a need for some quasi-laminate structure throughout the mantle component of the oceanic lithosphere. The new models help to bridge the gulf between the different viewpoints, but ambiguities remain.
机译：在海洋岩石圈中长距离传播后观察到的高频地震相Po和So的特征要求存在3D复杂结构的散射。当前的模型使用大洋岩石圈地震结构的随机表示。这些观测结果与准层状特征兼容，其水平相关长度约为10 km，垂直相关长度为0.5 km，在整个岩石圈的整个厚度范围内的均匀水平变化约为2％。这种结构很难用岩石学模型来解释，这将有利于岩石圈底部更强的非均质性，这与冻结熔体的底镀作用有关。岩石学证据大多指向比地震学建议的更小尺度的特征。来自不同领域的模型已独立推导，具有不同程度的简化。幸运的是，可以将地震学模型轻轻地修改为更强的基础非均质性，但是仍然需要在整个海洋岩石圈的地幔部分中有一些准层状结构。新模型有助于弥合不同观点之间的鸿沟，但仍然存在歧义。

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