Here are some good places to look for carbonates, sulfates or salts using THEMIS with its 100 m resolution:

Alternating Light- and Dark-toned Layers in Holden Crater
MGS MOC Release No. MOC2-262, 4 December 2000
http://www.msss.com/mars_images/moc/dec00_seds/holden/

Note the layered bright areas in these images of Holden crater. They are especially clear here:

MOC narrow-angle image M03-02733
Holden Crater floor near intersection with Uzboi Vallis
http://www.msss.com/moc_gallery/ab1_m04/maps/M0302733.gif

Also these:

Surveyor spacecraft spots bright sand dunes on Mars that researchers speculate could be mounds of sulfates
FOR RELEASE: Feb. 17, 1999
http://www.news.cornell.edu/releases/Feb99/thomas.mars.deb.html

NASA Mars Picture of the Day: Schiaparelli Sedimentary Rocks
Mars Global Surveyor Mars Orbiter Camera
MGS MOC Release No. MOC2-403, 26 June 2003
http://www.spaceref.com/news/viewsr.html?pid=9618

Mars Orbiter Camera (MOC) High Resolution Images:
Valley and Surrounding Terrain Adjacent to Schiaparelli Crater
http://science.ksc.nasa.gov/mars/mgs/msss/camera/images/11_10_97_release/2306/

MOC narrow-angle image M03-01521
White rock material in Gale Crater
http://www.msss.com/moc_gallery/ab1_m04/images/M0301521.html

MOC narrow-angle image M03-01709
Juventae Chasma--dark dunes and bright outcrop
http://www.msss.com/moc_gallery/ab1_m04/images/M0301709.html

Several images in the area near Schiaparelli Crater contain bright outcrops.
Several can be found at this link:

Mars Global Surveyor - Mars Orbiter Camera Image Gallery
M03
-6.28° to 2.26°
http://nagii.com/m03-lat7.htm

Look for the descriptions that contain the words "light" or "bright" or "Schiaparelli".

Such as this one:

MOC narrow-angle image M03-04392
Light/dark boundary at W margin of light unit W of Schiaparelli
http://www.msss.com/moc_gallery/ab1_m04/images/M0304392.html

Bob Clark

Holden Crater floor near intersection with Uzboi Vallis.

Schiaparelli Sedimentary Rocks.

White rock material in Gale Crater.

Juventae Chasma--dark dunes and bright outcrop.

Light/dark boundary at W margin of light unit W of Schiaparelli.