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Collection:
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NASA Planetary Photo Journal Collection
Collection
NASA Planetary Photo Journal Collection
Collection
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Title:
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Light-Toned Bedrock Along Cracks as Evidence of Fluid Alteration
Title
Light-Toned Bedrock Along Cracks as Evidence of Fluid Alteration
Title
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Original Caption Released with Image:
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This enhanced-color image from the High Resolution Imaging Science Experiment Camera on NASA's Mars Reconnaissance Orbiter shows a landscape of sand dunes and buttes among a background of light-toned (tan-colored) bands and dark-toned (blue-colored) bands in the Candor Chasma region of Mars' Valles Marineris canyon system.
The scene includes examples of thin dark lines bordered by light-toned bedrock [Figures 2A, 2B, and 2C]. The dark lines are interpreted as fractures, called joints, that were formerly underground but have been exposed at the surface by erosion of overlying material. The light-toned material along the joints is interpreted as features called halos, resulting from mineral alteration (bleaching, cementation or both) of the walls of the fractures by fluid moving through the fractures.
The image was acquired on Sept. 30, 2006, during winter in Mars' southern hemisphere, at a local Mars time of 3:29 p.m. It combines separate band passes taken by the High Resolution Imaging Science Experiment in blue-green light, red light and near-infrared light.
The scene is illuminated from the west (left) with a solar incidence angle of 58.5 degrees. The image scale is 26 centimeters (10 inches) per pixel, the scale of the red bandpass image. The other bandpasses were acquired with two-by-two pixel binning to 52 centimeters (20 inches) per pixel.
The image, in the camera's catalogue as TRA_000836_1740, is centered at 5.7 degrees south latitude, 284.6 degrees east longitude. A locator map [Supplement 2] based on elevation data from the Mars Orbiter Laser Altimeter on NASA's Mars Global Surveyor indicates this location in the context of the Candor Chasma region. A full resolution file of this image is available for download by clicking here (82 MB).
A subframe of the full image [Figure 1] shows the locations of smaller pull-outs selected for showing details of interest.
Supplement 3 shows light-toned and dark-toned layers. Meter-scale dune forms are commonly observed within the dark layers. Also shown are joints and surrounding halos. In contrast to Figure 2, the halos along these joints are laterally more extensive and less localized along the trace of the joint.
Supplement 4 shows two streamlined mesas of layered bedrock. The windward slopes of these mesas appear smooth, consistent with wind erosion. Boulders are common along the northwest slopes of the mesas. The horizontal spacing of joints appears to control the lateral dimensions of many of the largest boulders.
Supplement 5
Original_Caption_Rel eased_with_Image
This enhanced-color image from the High Resolution Imaging Science Experiment Camera on NASA's Mars Reconnaissance Orbiter shows a landscape of sand dunes and buttes among a background of light-toned (tan-colored) bands and dark-toned (blue-colored) bands in the Candor Chasma region of Mars' Valles Marineris canyon system.
The scene includes examples of thin dark lines bordered by light-toned bedrock [Figures 2A, 2B, and 2C]. The dark lines are interpreted as fractures, called joints, that were formerly underground but have been exposed at the surface by erosion of overlying material. The light-toned material along the joints is interpreted as features called halos, resulting from mineral alteration (bleaching, cementation or both) of the walls of the fractures by fluid moving through the fractures.
The image was acquired on Sept. 30, 2006, during winter in Mars' southern hemisphere, at a local Mars time of 3:29 p.m. It combines separate band passes taken by the High Resolution Imaging Science Experiment in blue-green light, red light and near-infrared light.
The scene is illuminated from the west (left) with a solar incidence angle of 58.5 degrees. The image scale is 26 centimeters (10 inches) per pixel, the scale of the red bandpass image. The other bandpasses were acquired with two-by-two pixel binning to 52 centimeters (20 inches) per pixel.
The image, in the camera's catalogue as TRA_000836_1740, is centered at 5.7 degrees south latitude, 284.6 degrees east longitude. A locator map [Supplement 2] based on elevation data from the Mars Orbiter Laser Altimeter on NASA's Mars Global Surveyor indicates this location in the context of the Candor Chasma region. A full resolution file of this image is available for download by clicking here (82 MB).
A subframe of the full image [Figure 1] shows the locations of smaller pull-outs selected for showing details of interest.
Supplement 3 shows light-toned and dark-toned layers. Meter-scale dune forms are commonly observed within the dark layers. Also shown are joints and surrounding halos. In contrast to Figure 2, the halos along these joints are laterally more extensive and less localized along the trace of the joint.
Supplement 4 shows two streamlined mesas of layered bedrock. The windward slopes of these mesas appear smooth, consistent with wind erosion. Boulders are common along the northwest slopes of the mesas. The horizontal spacing of joints appears to control the lateral dimensions of many of the largest boulders.
Supplement 5
Original Caption Released with Image
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Original Caption Released with Image:
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shows a high-density population of joints.
NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems, Denver, is the prime contractor for the project and built the spacecraft. The High Resolution Imaging Science Experiment is operated by the University of Arizona, Tucson, and the instrument was built by Ball Aerospace and Technology Corp., Boulder, Colo.
Original_Caption_Rel eased_with_Image
shows a high-density population of joints.
NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems, Denver, is the prime contractor for the project and built the spacecraft. The High Resolution Imaging Science Experiment is operated by the University of Arizona, Tucson, and the instrument was built by Ball Aerospace and Technology Corp., Boulder, Colo.
Original Caption Released with Image
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Image Credit:
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NASA/JPL/Univ. of Arizona
Image_Credit
NASA/JPL/Univ. of Arizona
Image Credit
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Produced By:
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University of Arizona/HiRise-LPL
Produced_By
University of Arizona/HiRise-LPL
Produced By
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Mission:
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Mars Reconnaissance Orbiter (MRO)
Mission
Mars Reconnaissance Orbiter (MRO)
Mission
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Spacecraft:
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Mars Reconnaissance Orbiter (MRO)
Spacecraft
Mars Reconnaissance Orbiter (MRO)
Spacecraft
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Target Name:
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Mars
Target_Name
Mars
Target Name
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Is a satellite of:
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Sol (our sun)
Is_a_satellite_of
Sol (our sun)
Is a satellite of
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Instrument:
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HiRISE
Instrument
HiRISE
Instrument
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Product Size:
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2336 samples x 3672 lines
Product_Size
2336 samples x 3672 lines
Product Size
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facet_what:
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Sun
facet_what
Sun
facet_what
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facet_what:
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Mars
facet_what
Mars
facet_what
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facet_what:
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Altimeter
facet_what
Altimeter
facet_what
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facet_what:
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Surveyor
facet_what
Surveyor
facet_what
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facet_what:
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TRACE
facet_what
TRACE
facet_what
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facet_what:
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MRO
facet_what
MRO
facet_what
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facet_what:
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Mars Global Surveyor Orbiter (MGS)
facet_what
Mars Global Surveyor Orbiter (MGS)
facet_what
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facet_what:
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Mars Orbiter Laser Altimeter (MOLA)
facet_what
Mars Orbiter Laser Altimeter (MOLA)
facet_what
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facet_what:
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Mars Reconnaissance Orbiter (MRO)
facet_what
Mars Reconnaissance Orbiter (MRO)
facet_what
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facet_what:
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High Resolution Imaging Science Experiment (HiRISE)
facet_what
High Resolution Imaging Science Experiment (HiRISE)
facet_what
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facet_where:
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Jet Propulsion Laboratory
facet_where
Jet Propulsion Laboratory
facet_where
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facet_where:
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Denver
facet_where
Denver
facet_where
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facet_where:
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Mars
facet_where
Mars
facet_where
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facet_where:
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Arizona
facet_where
Arizona
facet_where
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facet_where:
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California
facet_where
California
facet_where
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facet_where:
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Washington
facet_where
Washington
facet_where
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facet_where:
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Jet Propulsion Laboratory (JPL)
facet_where
Jet Propulsion Laboratory (JPL)
facet_where
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Image #:
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PIA09190
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UID:
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SPD-PHOTJ-PIA09190
UID
SPD-PHOTJ-PIA09190
UID
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orignial url:
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orignial_url
orignial url
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