4.
The picture is a mosaic of images acquired between August 2000 and September 2003. The area covered 14 kilometer (8.7 miles) by 19.3 kilometers (12 miles). North is up. Sunlight illuminates the scene from the left. The spacecraft's narrow-angle camera takes grayscale images; the color added is based on information from a camera on Mars Odyssey. The fan is in an unnamed crater that is 64 kilometers (40 miles) in diameter, at 24.3 degrees south latitude, 33.5 degrees west longitude. The crater lies northeast of a larger one named Holden Crater.
The fan is a fossil landform. That is, it is an eroded remnant of a somewhat larger and thicker deposit. The originally loose sediment was turned to rock and then eroded over time to present the features seen today. The channels through which sediment was transported are no longer present. Instead, only their floors remain, and these have been elevated by erosion so that former channels now stand as ridges. The floors of former channels became inverted in this way because they were more resistant to the forces of erosion, indicating they either were more strongly cemented than surrounding materials, or they have more coarse grains (which are harder to remove), or both.
Regions of the crater all exhibit similar abundances of feldspars, pyroxenes, sulfates and carbonates, however the fluvial deposit requires at least twice as much of the clay and sheet silicate minerals (indicative of hydrated minerals) to produce a reasonable spectral match.
5.
The area covered in the image to the right is 14 kilometer (8.7 miles) by 19.3 kilometers (12 miles).
Regions of the crater all exhibit similar abundances of feldspars, pyroxenes, sulfates and carbonates, however the fluvial deposit requires at least twice as much of the clay and sheet silicate minerals (indicative of hydrated minerals) to produce a reasonable spectral match.
6.
The area covered in the image to the right is 14 kilometer (8.7 miles) by 19.3 kilometers (12 miles).
Regions of the crater all exhibit similar abundances of feldspars, pyroxenes, sulfates and carbonates, however the fluvial deposit requires at least twice as much of the clay and sheet silicate minerals (indicative of hydrated minerals) to produce a reasonable spectral match.
10.
Equilibrium flow velocities for a visous fluid on a slope are proportional to g
Reynolds number, and hence turbulence, is proportional to flow velocity
Settling speed of a particle is proportional to g
therefore , if they are the same size as on earth and on the same slope, rivers and turbidity currents should both flow slower and be less turbulent, but will entrain the same amount of sediment. Possibly more significant is the different density of the sediment particles, if these are iron oxide (say) not quartz
