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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Geological history of the Tyre region of Europa: A regional perspective on Europan surface features and ice thickness
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Geological history of the Tyre region of Europa: A regional perspective on Europan surface features and ice thickness

机译：欧罗巴轮胎地区的地质历史：欧罗潘表面特征和冰厚度的区域性观点

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Galileo images of the Tyre Macula region of Europa at regional (170 m/pixel) and local (similar to 40 m/pixel) scales allow mapping and understanding of surface processes and landforms. Ridged plains, doublet and complex ridges, shallow pits, domes, "chaos" areas, impact structures, tilted blocks and massifs, and young fracture systems indicate a complex history of surface deformation on Europa. Regional and local morphologies of the Tyre region of Europa suggest that an impactor penetrated through several kilometers of water ice to a mobile layer below. The surface morphology was initially dominated by formation of ridged plains, followed by development of ridge bands and doublet ridges, with chaos and fracture formation dominating the latter part of the geologic history of the Tyre region. Two distinct types of chaos have been identified which, along with upwarped dome materials, appear to represent a continuum of features (domes-platy chaos-knobby chaos) resulting from increasing degrees of surface disruption associated with local lithospheric heating and thinning. Local and regional stratigraphic relationships, block heights, and the morphology of the Tyre impact structure suggest the presence of low-viscosity ice or liquid water beneath a thin (several kilometers) surface ice shell at the time of the impact. The very low impact crater density on the surface of Europa suggests that this thin shell has either formed or been thoroughly resurfaced in the very recent past. [References: 52]
机译：欧罗巴的轮胎黄斑地区的伽利略图像在区域（170 m /像素）和局部（类似于40 m /像素）比例尺上可以绘制和理解表面过程和地形。隆起的平原，双峰和复杂的山脊，浅坑，穹顶，“混乱”区域，冲击结构，倾斜的块体和断层以及年轻的断裂系统表明欧罗巴表面变形的复杂历史。欧罗巴轮胎区域的区域和局部形态表明，撞击器穿透了几公里的水冰，到达下方的活动层。表面形态最初主要是山脊平原的形成，其次是山脊带和双重山脊的发展，而混乱和裂缝的形成则主导了提尔地区的地质历史的后半部分。已经确定了两种不同类型的混沌，它们与翘曲的穹顶材料一起，代表了由局部岩石圈加热和变薄引起的表面破坏程度不断增加所导致的连续特征（穹顶-板状混沌-节拍性混沌）。局部和区域地层关系，块体高度以及轮胎撞击结构的形态表明，撞击时在薄（几千米）薄冰壳下面存在低粘度冰或液态水。欧罗巴表面的撞击坑密度非常低，表明这种薄壳在最近的一段时间内已经形成或已经彻底地重新表面化。 [参考：52]

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