Coarse-grained rocks of Ascension Island
The lavas and pyroclastics of Ascension Island contain a suite of coarse grained igneous blocks which range in composition from olivine-gabbro to peralkaline-granite paralleling, but extending beyond the compositional range of the volcanics. The lavas range from alkali-basalt through hawaiite, trachybasalt, trachyandesite and trachyte to comendite. True basalt is relatively rare and there is a scarcity of analyses with 57 < Si02 < 63 wt %.
No high pressure mineral assemblages a...Expand abstract
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- University of Oxford
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- Harris, C.
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- The digital copy of this thesis has been made available thanks to the generosity of Dr Leonard Polonsky
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