Do Deltas Along the Crustal Dichotomy Boundary of Mars in the Gale Crater Region Record a Northern Ocean?
Do Deltas Along the Crustal Dichotomy Boundary of Mars in the Gale Crater Region Record a Northern Ocean?
复制标题
盖尔陨石坑地区沿火星地壳二分边界的三角洲是否记录了北大洋？
DOI：
10.1029/2019gl083046
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发表时间：
2019
影响因子：
5.2
通讯作者：
M. Palucis
中科院分区：
文献类型：
--
作者：
F. Rivera‐Hernández;M. Palucis
三角洲沉积物沿着沿着火星地壳二分法边界陡坎被绘制成图，被认为描绘了火星北方低地的古代海洋。利用最近获得的轨道数据，我们扩大了二分法三角洲清单，并对三角洲前缘高程进行了更新分析，这是古水位的代表。我们的分析集中在盖尔陨石坑附近，这是Currency漫游者的家。我们发现，三角洲前缘海拔变化约为2,400米，但这些海拔变化并不对应于真实极地漂移或塔尔西斯的模拟变形。在局部地区，三角洲前缘高程变化≤60 m，使用现代地形，它们对应于不同的封闭盆地。我们推断，这些三角洲形成于面积约13，000平方公里、深度约0.4公里的古湖泊中，可能与盖尔的古湖泊同时代。我们的研究结果表明，不需要北方海洋来解释盖尔陨石坑地区的三角洲沉积。
Deltaic deposits mapped along the Martian crustal dichotomy boundary scarp have been suggested to delineate an ancient ocean in the northern lowlands of Mars. Using recently acquired orbital data, we have expanded the dichotomy delta inventory and performed an updated analysis of delta front elevations, a proxy for paleo‐water levels. Our analysis focused near Gale crater, home of the Curiosity rover. We found that delta front elevations vary by approximately 2,400 m, but these elevation variations do not correspond to modeled deformation from true polar wander or Tharsis. Locally, delta front elevations vary by ≤60 m, and using present‐day topography, they correspond to distinct enclosed basins. We infer that these deltas formed in paleo‐lakes up to approximately 13,000 km2 and approximately 0.4 km deep, perhaps coeval with paleo‐lakes in Gale. Our results suggest that a northern ocean is not needed to explain the deltaic deposits in the Gale crater region.
影响因子：
3.5
作者：
F. Rivera‐Hernández;D. Sumner;T. Mackey;I. Hawes;D. Andersen
通讯作者：
F. Rivera‐Hernández;D. Sumner;T. Mackey;I. Hawes;D. Andersen