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Culann Patera is a colourful volcanic centre on Io. A dark red, curving line may mark a crusted-over lava tube feeding the dark hot silicate flows to the northwest. Dark red flows to the southeast may be sulphur or silicate flows whose surfaces have been modified. Diffuse red material is perhaps a compound of sulphur deposited from a plume of gas. Culanns caldera and several lava flows extending from the caldera are coated by greenish materials.

CREDIT: NASA/JPL/University of Arizona.

Source:
http://photojournal.jpl.nasa.gov/catalog/PIA02535