Formation of lenticulae on Europa by saucer-shaped sills
Formation of lenticulae on Europa by saucer-shaped sills
复制标题
欧罗巴上由碟形基台形成的透镜状结构
DOI：
10.1016/j.icarus.2016.10.009
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发表时间：
2016
期刊：
影响因子：
3.2
通讯作者：
C. Michaut
中科院分区：
文献类型：
--
作者：
M. Manga;C. Michaut
木卫二的表面包含许多被称为凹坑、穹顶、斑点和小混沌的准椭圆特征。我们认为，这些特征统称为豆状，是木卫二冰壳中液态水的碟形窗台的表面表现。特别是，环绕水平内梁的倾斜的水片限制了侵入的横向范围，设定了豆状突起的横向尺寸。此外，倾斜的冰片破坏了侵入体上方的冰层，使内窗台加厚，产生观察到的豆状凸起，并使地壳破裂，形成小混乱。地台深度和横向范围之间的比例关系表明，假设的侵入体位于或曾经位于地表以下1-5公里处。据预测，液态水目前存在于坑下，并在混沌和穹顶下存在有限时间。
Europa's surface contains numerous quasi-elliptical features called pits, domes, spots and small chaos. We propose that these features, collectively referred to as lenticulae, are the surface expression of saucer-shaped sills of liquid water in Europa's ice shell. In particular, the inclined sheets of water that surround a horizontal inner sill limit the lateral extent of intrusion, setting the lateral dimension of lenticulae. Furthermore, the inclined sheets disrupt the ice above the intrusion allowing the inner sill to thicken to produce the observed relief of lenticulae and to fracture the crust to form small chaos. Scaling relationships between sill depth and lateral extent imply that the hypothesized intrusions are, or were, 1–5 km below the surface. Liquid water is predicted to exist presently under pits and for a finite time under chaos and domes.