Survival of impact-induced thermal anomalies in the Martian mantle
Survival of impact-induced thermal anomalies in the Martian mantle
复制标题
火星地幔中撞击引起的热异常的存在
DOI：
10.1029/2000je001474
复制
发表时间：
2002
影响因子：
--
通讯作者：
J. Baumgardner
中科院分区：
文献类型：
--
作者：
C. Reese;V. Solomatov;J. Baumgardner
[1]许多地球物理学的论点指出，在火星历史的大部分时间里，全球地幔对流可能非常缓慢，甚至不存在。这意味着在行星形成过程中产生的早期地幔热异常可能不会被强烈的对流迅速抹去。早期热不均匀性的一个可能机制是在猛烈轰击结束时的大撞击。我们认为，塔尔西斯省可能与这种影响引起的热异常，而不是对流羽。我们首选模型的现今大地水准面形状与火星全球勘测者（MGS）测量的大地水准面非常一致。
[1] A number of geophysical arguments point out the possibility that global mantle convection could have been extremely sluggish or even absent during a large part of Martian history. This implies that early mantle thermal anomalies produced during planetary formation might not have been quickly erased by vigorous convection. One likely mechanism of early thermal inhomogeneity is large impacts at the end of heavy bombardment. We suggest that Tharsis province might be related to such an impact-induced thermal anomaly rather than a convective plume. The shape of the present-day geoid for our preferred model is in good agreement with the geoid measured by Mars Global Surveyor (MGS).