Magmatic evolution of impact-induced Martian mantle plumes and the origin of Tharsis
Magmatic evolution of impact-induced Martian mantle plumes and the origin of Tharsis
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撞击引起的火星地幔柱的岩浆演化和塔尔西斯的起源
DOI：
10.1029/2003je002222
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发表时间：
2004
影响因子：
--
通讯作者：
A. Vezolainen
中科院分区：
文献类型：
--
作者：
C. Reese;V. Solomatov;J. Baumgardner;D. Stegman;A. Vezolainen
Tharsis省是火星火山活动的主要中心，其特征是巨大的重力和地形异常。塔尔西斯的起源是有争议的。一种假设是，这个省是由与来自核心幔幔边界的地幔柱相关的熔融产生的。另一种假设是塔尔西斯是由与撞击有关的羽流形成的。最近的研究表明，从地球动力学的角度来看，这一假设是合理的，而且长期存在的撞击羽流可能在小行星演化中发挥了作用。本文采用全三维球壳模拟地幔对流的方法，研究了撞击引起的热化学地幔柱的岩浆演化过程。模型预测的熔体体积和就位率能够满足塔尔西斯发展的观测约束。索引项：6225行星学：太阳系天体：火星；5430行星学：固体表面行星：内部（8147）；5455行星学：固体表面行星：起源和演化；8121构造物理学：动力学、对流和地幔柱；关键词：撞击羽流，地幔动力学，火星
[1] Tharsis province is a major center of Martian volcanic activity characterized by large gravity and topography anomalies. The origin of Tharsis is debated. One hypothesis is that the province was produced by melting associated with a mantle plume from the coremantle boundary. An alternative hypothesis is that Tharsis formed by a plume associated with an impact. Recent studies have shown that this hypothesis is plausible from a geodynamical point of view and that long-lived impact plumes might play a role in areoid evolution. In this study, the magmatic evolution of impact-induced thermochemical mantle plumes is investigated with fully three-dimensional spherical shell simulations of mantle convection. Melt volumes and emplacement rates predicted by the model can satisfy observational constraints on Tharsis development. INDEX TERMS: 6225 Planetology: Solar System Objects: Mars; 5430 Planetology: Solid Surface Planets: Interiors (8147); 5455 Planetology: Solid Surface Planets: Origin and evolution; 8121 Tectonophysics: Dynamics, convection currents and mantle plumes; KEYWORDS: impact plumes, mantle dynamics, Mars