Gough Island, one of the most southerly islands on the Slid-Atlantic Ridge, consists of rocks of the alkali basalt → trachyte association. Representative rock types, ranging from picrite-basalt, olivine basalt, trachybasalt, trachyandesite to trachyte have been analyzed for major and minor constituents. Crystallization trends have been determined lor the olivines, pyroxenes, feldspars, and iron-titanium ores using optical, chemical and X-ray methods. Strong evidence is given for differentiation by crystal fractionation.
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Edited by Peter A. Roma and published in 1976, Mid-Atlantic Ridge contains a collection of related articles reprinted from other Geological Society of America publications as well as a brief review of exploration of the Mid-Atlantic Ridge from 1960 to 1975.