Inverted Channels and Layers near Juventae Chasma
NASA/JPL/UArizona
Inverted Channels and Layers near Juventae Chasma
PSP_004423_1755  Science Theme: Geologic Contacts/Stratigraphy
This image shows plains North of the Southwestern Juventae Chasma, a canyon part of the gigantic Valles Marineris system.

There are three distinct terrains in this image, plains with possible inverted channels, plains with exposed layers, and layers on a wall of Juventae Chasma.

The top half of the image contains plains with craters and sinuous ridge features that are possibly inverted stream channels. Inverted relief occurs when a formerly low-lying area becomes high-standing. There are several possible reasons why channels might stand out in inverted relief. The streambed material may become cemented by precipating minerals, contain larger rocks, or become filled with lava, all which are more resistant to erosion. Finer-grained, more erodable material surrounding the channel is blown away by the wind or carried away by water, leaving the resistant channel bed high and dry around its environs.

Another example of erosion can be seen in the next terrain which covers about 2/3 of the bottom half of the image. Erosion has exposed a beautiful series of light and dark tone layers (approximately 1 kilometer across). In the cutout, the smallest of the rings is the deepest exposed layer.

Layers are common in the Martian canyons, but it is unknown what process formed them. It is likely that the layers in the plains here are made of the same material as the layer in the canyons.

Written by: Kelly Kolb  (15 August 2007)

This is a stereo pair with PSP_005412_1755.
 
Acquisition date
07 July 2007

Local Mars time
14:52

Latitude (centered)
-4.605°

Longitude (East)
296.478°

Spacecraft altitude
262.0 km (162.8 miles)

Original image scale range
26.8 cm/pixel (with 1 x 1 binning) so objects ~80 cm across are resolved

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25 cm/pixel and North is up

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Equirectangular

Emission angle
12.2°

Phase angle
35.3°

Solar incidence angle
46°, with the Sun about 44° above the horizon

Solar longitude
271.7°, Northern Winter

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North azimuth:  97°
Sub-solar azimuth:  334.1°
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POSTSCRIPT
NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.