The dual nature of the martian crust: Young lavas and old clastic materials
The dual nature of the martian crust: Young lavas and old clastic materials
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DOI：
10.1016/j.icarus.2012.10.023
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发表时间：
2013-01-01
期刊：
影响因子：
3.2
通讯作者：
Brand, Brittany D.
中科院分区：
文献类型：
--
作者：
Bandfield, Joshua L.;Edwards, Christopher S.;Brand, Brittany D.
可见光和热红外航天器数据集被用来深入了解表面物质和上火星地壳的性质，揭示了在西方时代发生的火星地壳物质物理性质的明显转变。与火星地壳主要由熔岩流组成的流行观点相反，我们发现火星上大多数较老的地区具有与可能具有火山岩起源的固结不良的细颗粒物质相一致的形态和热物理性质。相比之下，较年轻的表面包含块状物质和热物理性质与喷涌的熔岩流一致。爆发性火山活动很可能在早期火星上占主导地位，这些发现对地壳和地幔的挥发性成分的演变以及随后的表面形态的发展具有影响。地壳的这种双重性质似乎是火星历史的一个决定性特征。(C)2012 Elsevier Inc. All rights reserved.
Visible and thermal infrared spacecraft datasets are used to gain insight into the nature of the surface materials and upper martian crust, revealing a distinct transition in the physical properties of martian crustal materials that occurred during the Hesperian era. Contrary to a prevailing view of the martian crust as primarily composed of lava flows, we find that most older regions of Mars have morphological and thermophysical properties consistent with poorly consolidated fine-particulate materials that may have a volcaniclastic origin. By contrast, younger surfaces contain blocky materials and thermophysical properties consistent with effusive lava flows. Explosive volcanism is likely to have been dominant on early Mars and these findings have implications for the evolution of the volatile content of the crust and mantle and subsequent development of the surface morphology. This dual nature of the crust appears to be a defining characteristic of martian history. (C) 2012 Elsevier Inc. All rights reserved.