Chemical and physical constraints on petrogenesis and emplacement of ENA olivine diabase magma types
作者： DAVID WHITTINGTON
DOI: 10.1016/B978-0-444-42903-2.50028-2
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摘要: Abstract Early Mesozoic olivine-normative diabase dikes of eastern North America (‘ENA’ dikes) are resolved into two fundamentally different groups. Data from the first group define continuous variation primary tholeiitic parental compositions to calc-alkaline (high-alumina) fractionation products. second trends; one toward alkalic indicative mantle and another trend quartz-tholeiitic representative crustal fractionation. Both occupy NW-trending fractures in Carolinas Georgia – radial a hot spot proposed for Blake Plateau Senegal basin conjugate margin.
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