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Petrology of the differentiated series
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abstr alkalic analyses andesitic Antarctic Arizona ash-flow tuffs associated basalts Basin basin-range faulting bimodal blocks breccias Bull calc-alkalic California Cenozoic Cenozoic volcanism central centres Colorado composition continental County Cretaceous crust crustal depth Differentiated Series dykes east eastern Eocene erupted figure flows fracture zone fundamentally basaltic garnet peridotite Geology geophys geophysical Gilluly Graham Land Iceland igneous activity igneous rocks intrusive islands kimberlite late Cenozoic lavas layer lherzolite Lipman magma magnetic anomalies margin middle Cenozoic mineral Miocene Mountains Nevada northern oceanic Oligocene olivine Pacific partial melting peridotite petrology phenocrysts phonolites Piton des Neiges plate Plateau Pliocene Potassium-argon Potassium-argon dating Prof quadrangle Quaternary range region rhyolite San Juan Scotia Ridge Scotia Sea sediments seismic sequence silicic South Georgia south Scotia Ridge southern structure suggest Surv tectonic Tertiary trachytes trench tuffs types U.S. geol upper mantle volcanic field volcanic rocks Western United xenoliths younger