Friday, March 26, 2010

A Look At Mars' Melas Chasma

Posted By on Fri, Mar 26, 2010 at 12:16 AM

PSP_002419_1675.jpg
  • NASA/JPL/University of Arizona

The latest batch of pics from the UA Lunar and Planetary Lab's HiRISE camera in orbit around Mars can be found here, including this shot of Melas Chasma.

HiRISE team member Cathy Weitz tells us:

This subimage shows layering in a light-toned deposit in Melas Chasma.

The layers are sedimentary in origin, but there are many processes that could have deposited them, such as volcanic airfall from explosive eruptions, or dust-size particles settling out of the atmosphere due to cyclic changes, and deposition in standing bodies of water.

By looking at the slopes in the layers and how the

layers intersect each other, scientists can rule out various origins. A darker material can be seen covering much of the layered deposit. Some of this dark material is loose and can be seen accumulating as debris aprons at the base of steep slopes. Other dark material appears indurated and has been eroded by the wind to form etched edges with topographic expressions.

The lack of impact craters on the layered deposit indicates that it is a relatively young deposit, or the craters have been removed by the wind, or the deposit was quickly buried and is now being exhumed.

Comments

Subscribe to this thread:

Add a comment

More by Jim Nintzel

Today | Thu | Fri | Sat | Sun | Mon | Tue
PiYo Strength Class

PiYo Strength Class @ Floor Polish

Thursdays, 4:30-5:30 p.m.

All of today's events | Staff Picks

Staff Pick

Carnival of Illusion: Magic, Mystery & Oooh La La!

This top-rated illusion show is "Revitalizing Magic" by blending an international travel theme with all the charms… More

@ Scottish Rite Grand Parlour Saturdays. Continues through April 14 160 South Scott Ave

» More Picks

Submit an Event Listing

Popular Content

  1. UPDATE: Please stop sending your sweet, sweet turkeys! (The Range: The Tucson Weekly's Daily Dispatch)
  2. Cutting Teacher Compensation and School Funding in Wisconsin (The Range: The Tucson Weekly's Daily Dispatch)
  3. Laughing Stock: The People's Pervert Does Christmas (The Range: The Tucson Weekly's Daily Dispatch)
  4. The 'Freedom Center's' High School Course Is On Shaky Ground at TUSD (The Range: The Tucson Weekly's Daily Dispatch)
  5. Sweetie Needs a Home (The Range: The Tucson Weekly's Daily Dispatch)

© 2017 Tucson Weekly | 7225 Mona Lisa Rd. Ste. 125, Tucson AZ 85741 | (520) 797-4384 | Powered by Foundation