Composition and origin of rhyolite melt intersected by drilling in the Krafla geothermal field, Iceland - Zierenberg, R.A.; Schiffmant, Peter; Barfod, G.H.; Lesher, C.E.; Marks, N.E.; Lowenstern, Jacob; Mortensen, A.K.; Pope, E.C.; Bird, D.K.; Reed, M.H.; Fridleifsson, G.O.; Elders, W.A. (Contributions to Mineralogy and Petrology, 2013)