This report shows a meltwater channel in Fig. 1 near the largest polar sulfate deposit:

FORMATION OF THE MARTIAN NORTH POLAR GYPSUM DEPOSIT DURING THE AMAZONIAN.
K. E. Fishbaugh1, F. Poulet2, Y. Langevin2, V. Chevrier3, and J-P. Bibring2. 1International Space Science Institute (ISSI), Hallerstrasse 6, Bern CH-3012 Switzerland, ****@issi.unibe.ch. 2Institut d'Astrophysique Spatiale (IAS), Bâtiment 121, 91405 Orsay Campus, France. 3CEREGE, Europóle de l’Arbois, BP80, 13545 Aix-en-Provence Cedex 04, France.
Fourth Mars Polar Science Conference (2006).
http://www.lpi.usra.edu/meetings/polar2006/pdf/8041.pdf

Perhaps the meltwater channel was formed by a near polar volcano. If so, it should be located near the origin of the channel. Unfortunately, the image doesn't show the start of the channel.
Anyone able to locate MOC or THEMIS images of this channel that shows the location of the origin of the channel? Then it could be determined if volcanic landforms lie nearby.

Bob Clark