I wish to congratulate the winners of this weeks competition. I had done a lot to the image by Eggert Nordahl. I croped it to remove the Hellisheidarvirkjun pipelines on the left of the picture, and I also croped off the Hellisheidar-SIL. Then I inverted it to further bungle up any Google Image Searches.
So, Alan caught the surface lavas, Irpsit nicked the Grámosi and the Hengill points, and finally Spica had the Hellisheidi eruption (in Icelandic Hellisheidahraun).
While coasting around for info on Hengill I found a drill core that had been analyzed. It seems like Hengill has had not less then 5 different magma-zones. I think the weirdest would be the chloro-epidote stage. If I understand it correctly chloro-epidotes are constructed by forsterite (olivine) is quenched into a salt-brine. This phase would of course be from the time when Hengill was rather suffering from being sub-aquatic (before it rose out of the sea). I guess that Alan will let me know if I got this all wrong and in no uncertain terms.
So, to round it off, one could say that the image is from the Hellisheidarvirkjun Powerplant.