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PRESS RELEASE
11.18.2014

Second Time Through, Mars Rover Examines Chosen Rocks

Erosion Resistance at 'Pink Cliffs' at Base of Martian Mount Sharp (Labeled)
Erosion Resistance at 'Pink Cliffs' at Base of Martian Mount Sharp (Labeled)
This small ridge, about 3 feet long, appears to resist wind erosion more than the flatter plates around it. Such differences are among the traits NASA's Curiosity Mars rover is examining at selected rock targets at the base of Mount Sharp. Curiosity's Mastcam acquired this view on Oct. 7, 2014.

NASA's Curiosity Mars rover has completed a reconnaissance "walkabout" of the first outcrop it reached at the base of the mission's destination mountain and has begun a second pass examining selected rocks in the outcrop in more detail.

Ripples Beside 'Pahrump Hills' Outcrop at Base of Mount Sharp
Ripples Beside 'Pahrump Hills' Outcrop at Base of Mount Sharp
Credit: NASA/JPL-Caltech

Exposed layers on the lower portion of Mount Sharp are expected to hold evidence about dramatic changes in the environmental evolution of Mars. That was a major reason NASA chose this area of Mars for this mission. The lowermost of these slices of time ascending the mountain includes a pale outcrop called "Pahrump Hills." It bears layers of diverse textures that the mission has been studying since Curiosity acquired a drilled sample from the outcrop in September.

In its first pass up this outcrop, Curiosity drove about 360 feet (110 meters), and scouted sites ranging about 30 feet (9 meters) in elevation. It evaluated potential study targets from a distance with mast-mounted cameras and a laser-firing spectrometer.

"We see a diversity of textures in this outcrop -- some parts finely layered and fine-grained, others more blocky with erosion-resistant ledges," said Curiosity Deputy Project Scientist Ashwin Vasavada of NASA's Jet Propulsion Laboratory, Pasadena, California. "Overlaid on that structure are compositional variations. Some of those variations were detected with our spectrometer. Others show themselves as apparent differences in cementation or as mineral veins. There's a lot to study here."

During a second pass up the outrcrop, the mission is using a close-up camera and spectrometer on the rover's arm to examine selected targets in more detail. The second-pass findings will feed into decisions about whether to drill into some target rocks during a third pass, to collect sample material for onboard laboratory analysis.

"The variations we've seen so far tell us that the environment was changing over time, both as the sediments were laid down and also after they hardened into bedrock," Vasavada said. "We have selected targets that we think give us the best chance of answering questions about how the sediments were deposited -- in standing water? flowing water? sand blowing in the wind? -- and about the composition during deposition and later changes."

Fine-Grained, Finely Layered Rock at Base of Martian Mount Sharp (Labeled)
Fine-Grained, Finely Layered Rock at Base of Martian Mount Sharp
Credit: NASA/JPL-Caltech/MSSS

The first target in the second pass is called "Pelona," a fine-grained, finely layered rock close to the September drilling target at the base of Pahrump Hills outcrop. The second is a more erosion-resistant ledge called "Pink Cliffs."

Before examining Pelona, researchers used Curiosity's wheels as a tool to expose a cross section of a nearby windblown ripple of dust and sand. One motive for this experiment was to learn why some ripples that Curiosity drove into earlier this year were more difficult to cross than anticipated.

While using the rover to investigate targets in Pahrump Hills, the rover team is also developing a work-around for possible loss of use of a device used for focusing the telescope on Curiosity's Chemistry and Camera (ChemCam) instrument, the laser-firing spectrometer.

Diagnostic data from ChemCam suggest weakening of the instrument's smaller laser. This is a continuous wave laser used for focusing the telescope before the more powerful laser is fired. The main laser induces a spark on the target it hits; light from the spark is received though the telescope and analyzed with spectrometers to identify chemical elements in the target. If the smaller laser has become too weak to continue using, the ChemCam team plans to test an alternative method: firing a few shots from the main laser while focusing the telescope, before performing the analysis. This would take advantage of more than 2,000 autofocus sequences ChemCam has completed on Mars, providing calibration points for the new procedure.

Curiosity landed on Mars in August 2012, but before beginning the drive toward Mount Sharp, the rover spent much of the mission's first year productively studying an area much closer to the landing site, but in the opposite direction. The mission accomplished its science goals in that Yellowknife Bay area. Analysis of drilled rocks there disclosed an ancient lakebed environment that, more than three billion years ago, offered ingredients and a chemical energy gradient favorable for microbes, if any existed there.

Ripple's Interior Exposed by Rover Wheel Track
Ripple's Interior Exposed by Rover Wheel Track
Credit: NASA/JPL-Caltech/MSSS

Curiosity spent its second year driving more than 5 miles (8 kilometers) from Yellowknife Bay to the base of Mount Sharp, with pauses at a few science waypoints.

NASA's Mars Science Laboratory Project is using Curiosity to assess ancient habitable environments and major changes in Martian environmental conditions. JPL, a division of the California Institute of Technology in Pasadena, built the rover and manages the project for NASA's Science Mission Directorate in Washington.

For more information about Curiosity, visit:

http://www.nasa.gov/msl
http://mars.nasa.gov/msl/

You can follow the mission on Facebook and Twitter at:

http://www.facebook.com/marscuriosity
http://www.twitter.com/marscuriosity

2014-401

Guy Webster
Jet Propulsion Laboratory, Pasadena, Calif.
818-354-6278
guy.webster@jpl.nasa.gov


All Related Images
  • A wheel track cuts through a windblown ripple of dusty sand in this Nov. 7, 2014, image from the Mastcam on NASA's Curiosity rover. The view spans about four feet across. This experiment was planned for yielding a view of the inside of the ripple for assessment of particle sizes and composition.
    Ripple's Interior Exposed by Rover Wheel Track (Labeled)
  • A wheel track cuts through a windblown ripple of dusty sand in this Nov. 7, 2014, image from the Mastcam on NASA's Curiosity rover. The view spans about four feet across. This experiment was planned for yielding a view of the inside of the ripple for assessment of particle sizes and composition.
    Ripple's Interior Exposed by Rover Wheel Track
  • Fine-Grained Rock at Base of Martian Mount Sharp
    Fine-Grained, Finely Layered Rock at Base of Martian Mount Sharp (Labeled)
  • Fine-Grained Rock at Base of Martian Mount Sharp
    Fine-Grained, Finely Layered Rock at Base of Martian Mount Sharp
  • Erosion Resistance at 'Pink Cliffs' at Base of Martian Mount Sharp
    Erosion Resistance at 'Pink Cliffs' at Base of Martian Mount Sharp (Labeled)
  • Ripples Beside 'Pahrump Hills' Outcrop at Base of Mount Sharp
    Ripples Beside 'Pahrump Hills' Outcrop at Base of Mount Sharp
  • Erosion Resistance at 'Pink Cliffs' at Base of Martian Mount Sharp
    Erosion Resistance at 'Pink Cliffs' at Base of Martian Mount Sharp
Credit: NASA/JPL-Caltech

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