土卫六蒸发地形的成分相似性和区别
Compositional Similarities and Distinctions between Titan's Evaporitic Terrains
摘要：
我们的文件之间的相似性组成的赤道盆地Tui Regio，Hotei Regio，和其他5- $μ$米-明亮的材料，特别是北极陨石，通过调查的存在和程度的吸收功能在4.92 $μ$米。在大多数观测中，Woytchugga Lacuna，Ontario Lacus，MacKay Lacus，Fensal附近的沉积物，Ligeia南部的一些湖泊和干湖床，以及Kraken Mare的南岸共享在Tui和Hotei光谱中观察到的4.92 \um的吸收特征。除Woytchugga和Fensal外，这些5- $μ$ m-亮矿床是地貌上证实的钙长石。因此，组成上的相似性加强了Tui和Hotei曾经含有液体的假设。然而，其他蒸发岩矿床没有显示出4.92 \um的吸收，特别是在北极的Muggel Lacus和Ligeia Mare海岸。这种成分上的差异表明，泰坦的湖泊中有不止一种可溶性物质可以产生蒸发岩，并且/或者VIMS波长尺度下的表面特性在不同沉积物之间并不均匀（晶体大小，丰度等）。我们的研究结果表明，泰坦陨石的表面结构，成分和形成历史可能至少与地球上的陨石一样动态和复杂。
英文摘要：
We document the similarities in composition between the equatorial basins Tui Regio, Hotei Regio, and other 5-$μ$m-bright materials, notably the north polar evaporites, by investigating the presence and extent of an absorption feature at 4.92 $μ$m. In most observations, Woytchugga Lacuna, Ontario Lacus, MacKay Lacus, deposits near Fensal, some of the lakes and dry lake beds south of Ligeia, and the southern shores of Kraken Mare share the absorption feature at 4.92 \um observed in the spectra of Tui and Hotei. Besides Woytchugga and at Fensal, these 5-$μ$m-bright deposits are geomorphologically-substantiated evaporites. Thus, the similarity in composition strengthens the hypothesis that Tui and Hotei once contained liquid. Other evaporite deposits, however, do not show the 4.92 \um absorption, notably Muggel Lacus and the shores of Ligeia Mare at the north pole. This difference in composition suggests that there are more than one kind of soluble material in Titan's lakes that can create evaporite and/or that the surface properties at the VIMS wavelength scale are not uniform between the different deposits (crystal size, abundance, etc). Our results indicate that the surface structure, composition, and formation history of Titan's evaporites may be at least as dynamic and complex as their Earth counterparts.
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