Selection of the landing site in Isidis Planitia of Mars probe Beagle 2
Selection of the landing site in Isidis Planitia of Mars probe Beagle 2
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DOI：
10.1029/2001je001820
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发表时间：
2003-01-04
影响因子：
4.8
通讯作者：
Morley, JG
中科院分区：
文献类型：
--
作者：
Bridges, JC;Seabrook, AM;Morley, JG
本文介绍了 Mars 2004 Beagle 2 任务着陆点的选择和特征。该地点位于北纬 10 度至 12 度、西经 266 度至 274 度之间的伊西迪斯平原内，中心位于北纬 11.6 度、西经 269.5 度。这里海拔较低（-3600 至 -3900 m MOLA），地势平坦（MOLA RMS 斜率 = 0.57 度），雷达数据表明其表面在分米到米尺度上比探路者站点更光滑，并且岩石丰度适中（2-17%，平均 11%）。除此之外，Isidis 还显示出挥发物浓缩和再流动的证据。特别是，该盆地包含圆锥形地貌。我们倾向于涉及岩浆-冰相互作用过程中凝灰岩锥形成的模型。 MOC 图像中被识别为堤坝的结构可能是岩浆通道的残余物。伊西迪斯的整体热惯性模式（西南-东南-东缘周围的较高值 500 Jm(-2) s(-0.5) K-1 向中心和北部降低）表明沉积物的流入从盆地南半部周围的诺亚纪区域扩散到盆地底部。粗大、热惯性较高的材料沉积在最靠近沉积物源的地方。凝灰岩锥的不同侵蚀状态表明它们是在亚马逊纪元和可能的希腊纪元期间在很长一段时间内间歇性形成的。从地质角度看，伊西迪斯最近的表面重生也是由风成作用造成的，这可以通过撞击坑的缺失来证明
This paper describes selection and characterization of the landing site for the Mars 2004 Beagle 2 mission. The site is within Isidis Planitia between 10degrees-12N, 266degrees-274degreesW, centered at 11.6degreesN, 269.5degreesW. This is at low elevation (-3600 to -3900 m MOLA), is flat (MOLA RMS slope=0.57degrees), radar data suggest a smoother surface at decimeter to meter scales than the Pathfinder site and it has a moderate rock abundance (2-17%, mean 11%). In addition to this, Isidis shows evidence for concentration and remobilization of volatiles. In particular, the basin contains conical landforms. We favor models involving the formation of tuff cones during magma-ice interaction. Structures identified as dykes in MOC images may be remnants of magma conduits. The pattern of bulk thermal inertia in Isidis (higher values of 500 Jm(-2) s(-0.5) K-1 around the SW-S-E margin decreasing toward the center and north) suggests that an influx of sediment spread from the Noachian areas around the southern half of the basin over the basin floor. The coarse, higher thermal inertia material was deposited closest to the sediment source. The variable state of erosion of the tuff cones suggests that they formed intermittently over a long period of time during Amazonian and possibly Hesperian epochs. Geologically recent resurfacing of Isidis has also occurred by aeolian processes, and this is shown by a deficit in impact craters