Current Venus tectonics suggests a stagnant lid mode of mantle convection. However, the planet is debated to enter an episodic regime after long quiescent periods, driven by resurfacing due to rapid subduction and global crustal recycling. Tessera regions that cover approximately 10% of Venus' surface appear to be strongly deformed, which suggests that they have survived at least the latest resurfacing event, although the composition and age of the tesserae are unknown. Based on mantle convection modeling, we studied the effects of anomalous crustal provinces (ACPs) on mantle dynamics and postoverturn lithospheric survival. As a hypothesis, we assume ACPs to be thick, compositionally anomalous, and rheologically strong units, similar to terrestrial cratons. We model Venus with a varying number of preimposed ACP units and differing lithospheric yield stress in 2‐D and 3‐D spherical geometry. The impact of ACPs on mantle dynamics and the survival of lithosphere is investigated by examining the thermal evolution, crustal thickness, and surface age distribution. We find that the number and timing of overturns are highly dependent on the yield stress and, to some degree, on the number and size of the preimposed ACPs. ACPs in particular affect the wavelength of convection and may foster the survival of lithosphere even of those portions not being part of an ACP. However, ACPs do not seem to be a good analog for tessera regions due to their exaggerated age and (likely) thickness, but—with appropriate density contrast—may be more useful representatives of Venus' highland plateaus.

中文翻译：

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地壳异常地区对金星重现历史的影响

当前的金星构造表明地幔对流处于停滞的盖模式。然而，由于快速俯冲和全球地壳的循环再造，在长时间的静止期之后，人们争论地球是否将进入偶发状态。覆盖金星表面约10％的Tessera区域似乎发生了严重变形，这表明它们至少在最近的表面重现事件中幸存了下来，尽管该tesserae的组成和年龄尚不清楚。基于地幔对流模型，我们研究了地壳异常省（ACP）对地幔动力学和倾覆后岩石圈生存的影响。作为一个假设，我们假设ACP较厚，组成异常，流变学上很强，类似于陆地克拉通。我们在2维和3维球形几何中使用不同数量的预设ACP单位和不同的岩石圈屈服应力对金星进行建模。通过检查热演化，地壳厚度和表面年龄分布，研究了ACP对地幔动力学和岩石圈生存的影响。我们发现，倾覆的次数和时机在很大程度上取决于屈服应力，并且在某种程度上取决于预先设定的ACP的数量和大小。ACP尤其会影响对流的波长，甚至可以促进岩石圈的生存，即使这些部分不属于ACP。但是，由于ACP年龄大，厚度大（可能）厚，因此似乎并不是泰斯拉地区的良好模拟，但如果具有适当的密度对比，它可能更是维纳斯高原的有用代表。