Fluvial Volumes , Timescales , and Intermittency in Milna Crater , Mars
نویسندگان
چکیده
Introduction: Ancient lake deposits and valley networks on Mars provide strong evidence that its surface was once modified by liquid water [1,2,3,4,5], but the extent of that modification is still debated. Ancient lacustrine deposits in Milna Crater (23.4 S, 12.3 W; Fig. 1) provide insight into the timescale and fluid volume required to construct fluvially derived sedimentary deposits near the Noachian-Hesperian boundary. Placing the lacustrine deposits their regional context in Paraná Valles provides a quantitative measurement of the intermittency of large, water-mediated sediment transport events in that region.
منابع مشابه
Timescales of fluvial activity and intermittency in Milna Crater, Mars
Milna Crater, Mars (23.4S, 12.3W) exhibits signs of fluvial modification early in Mars history, including a large multi-lobed fan deposit cut by several sinuous valleys. We describe the past hydrologic conditions in Milna and the surrounding area, including a potential lake with a volume of 50 km 3. We also introduce new methods (i) to calculate the timescale of sediment deposition by consideri...
متن کاملFluvial Volumes , Timescales , and Intermittency in Milna Crater
Introduction: Ancient lake deposits and valley networks on Mars provide strong evidence that its surface was once modified by liquid water [1,2,3,4,5], but the extent of that modification is still debated. Ancient lacustrine deposits in Milna Crater (23.4 S, 12.3 W; Fig. 1) provide insight into the timescale and fluid volume required to construct fluvially derived sedimentary deposits near the ...
متن کاملImpact ejecta-induced melting of surface ice deposits on Mars
Fluvial features present around impact craters on Mars can offer insight into the ancient martian climate and its relationship to the impact cratering process. The widespread spatial and temporal distribution of surface ice on Mars suggests that the interaction between impact cratering and surface ice could have been a relatively frequent occurrence. We explore the thermal and melting effects o...
متن کاملAspects of alluvial fan shape indicative of formation process: A case study in southwestern California with application to Mojave Crater fans on Mars
[1] Longitudinal profiles from six alluvial fans surveyed in southwestern California have quantitative attributes that can distinguish formation processes. The radial slope of fans where debris flow processes dominated is constant while fluvially-fed fans have a concave-upward shape. We find the power law regression of upstream slope-distance profiles is the preferred approach for assessing con...
متن کاملSimulating the development of Martian highland landscapes through the interaction of impact cratering, fluvial erosion, and variable hydrologic forcing
On the highlands of Mars early in the history of the planet precipitation-driven fluvial erosion competed with ongoing impact cratering. This disruption, and the multiple enclosed basins produced by impacts, is partially responsible for a long debate concerning the processes and effectiveness of fluvial erosion. The role of fluvial erosion in sculpting the early Martian landscape is explored he...
متن کامل