Coupled tidal tomography and thermal constraints for probing Mars viscosity profile

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Icarus Pub Date : 2024-09-19 DOI:10.1016/j.icarus.2024.116318
Alex Guinard, Agnès Fienga, Anthony Mémin, Clément Ganino
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Abstract

Computing the tidal deformations of Mars, we explored various Mars spherically symmetric internal structures with different types of interface between the mantle and the liquid core. By assessing their compatibility with a diverse set of geophysical observations we show that despite the very short periods of excitation, tidal deformation is very efficient to constrain Mars interior. We calculated densities and thicknesses for Martian lithosphere, mantle, core–mantle boundary layers and core and found them consistent with preexisting results from other methods. We also estimated new viscosities for these layers. We demonstrated that the geodetic records associated with thermal constraints are very sensitive to the presence of a 2-layered interface on the top of the liquid core in deep Martian mantle. This interface is composed by 2 layers of similar densities but very different viscosity and rheology: the layer on the top of the core is liquid (Newtonian, NBL) and the one at the base of the mantle, overlaying the liquid one, is an Andrade layer (ABL) with a viscosity in average 10 orders of magnitude greater than the Newtonian layer. Our results also indicate that the existence of this 2-layered interface significantly impacts the viscosity profiles of the mantle and the lithosphere. More precisely, models including the 2-layered interface do not display significant viscosity contrast between the mantle and the lithosphere, preventing mechanical decoupling between a lithosphere and the mantle immediately below. Such models are in favor of a stagnant lid regime that can be supported by the current absence of an Earth-like plate tectonics on Mars. Finally, in our results, the presence of liquid Newtonian layer at the top of the liquid core is incompatible with the existence of a solid inner core.
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用于探测火星粘度分布的潮汐层析成像和热约束耦合技术
通过计算火星的潮汐变形,我们探索了地幔和液态内核之间具有不同类型界面的各种火星球形对称内部结构。通过评估这些结构与各种地球物理观测数据的兼容性,我们发现尽管激发周期很短,但潮汐形变对约束火星内部非常有效。我们计算了火星岩石圈、地幔、地核-地幔边界层和地核的密度和厚度,发现它们与其他方法的已有结果一致。我们还为这些层估算了新的粘度。我们证明,与热约束相关的大地测量记录对火星地幔深处液态内核顶部存在的两层界面非常敏感。该界面由两层密度相似但粘度和流变性迥异的物质组成:地核顶部的物质层为液态(牛顿层,NBL),地幔底部覆盖液态物质层的物质层为安德拉德层(ABL),其粘度平均比牛顿层大 10 个数量级。我们的研究结果还表明,这两层界面的存在极大地影响了地幔和岩石圈的粘度分布。更确切地说,包含两层界面的模型不会在地幔和岩石圈之间显示出明显的粘度对比,从而阻止岩石圈和紧接其下的地幔之间的机械解耦。这种模型有利于停滞的盖层机制,目前火星上没有类似地球的板块构造也可以支持这种机制。最后,根据我们的研究结果,液态内核顶部存在液态牛顿层与固态内核的存在是不相容的。
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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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