Stratigraphy of the North Polar Deposits
NASA/JPL/University of Arizona
Stratigraphy of the North Polar Deposits
PSP_010198_2645  Science Theme: Polar Geology
Greek 


WALLPAPER

800  1024  
1152  1280  
1440  1600  
1920  2048  
2560  
This image shows an example of layers in the Martian north polar deposits. These deposits, part of the Planum Boreum dome, are composed mainly of water ice and small amounts of dust.

The layers within these deposits are exposed by shallowly-sloping troughs that cut into them. This image is particularly interesting because it crosses complicated trough geometry, making the layers appear curved and exposing multiple stratigraphic levels.

Note that layers of different thicknesses are visible. Layer thickness is directly related to the accumulation rate of the layer; a higher accumulation rate will lead to a thicker layer. However, a myriad of factors work together to influence accumulation rate, such as the amount of sunlight reaching the surface and the amount of water in the contemporaneous atmosphere.

This image, 1.2 kilometer in width (0.75 miles) shows enhanced color data. Redder areas have more dust, and the blueish-white areas have more ice; but much of the color may be due to dust and ice deposited on the wall of the trough, after the layers were exposed by trough formation (i.e., color may not directly relate to layer composition).

Written by: Kate Fishbaugh   (19 November 2008)

This is a stereo pair with PSP_010014_2645.

Click to share this post on Twitter Click to share this post on Facebook Click to share this post on Google+ Click to share this post on Tumblr



 
Acquisition date
29 September 2008

Local Mars time:
13:07

Latitude (centered)
84.389°

Longitude (East)
253.075°

Range to target site
319.7 km (199.8 miles)

Original image scale range
32.0 cm/pixel (with 1 x 1 binning) so objects ~96 cm across are resolved

Map projected scale
25 cm/pixel

Map projection
Polarstereographic

Emission angle:
7.9°

Phase angle:
73.4°

Solar incidence angle
67°, with the Sun about 23° above the horizon

Solar longitude
134.1°, Northern Summer

North azimuth:
128°

Sub-solar azimuth:
323.4°
JPEG
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

JP2
Black and white
map-projected   (1390MB)

IRB color
map-projected   (642MB)

JP2 EXTRAS
Black and white
map-projected  (781MB)
non-map           (595MB)

IRB color
map projected  (249MB)
non-map           (477MB)

Merged IRB
map projected  (392MB)

Merged RGB
map-projected  (367MB)

RGB color
non map           (429MB)
ANAGLYPHS
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

DIGITAL TERRAIN MODEL (DTM)
DTM details page

ADDITIONAL INFORMATION
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products
HiView

NB
IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images



USAGE POLICY
All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:
NASA/JPL/University of Arizona



Postscript
For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. 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. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.