J
John A. Philpotts
Researcher at Goddard Space Flight Center
Publications - 43
Citations - 2584
John A. Philpotts is an academic researcher from Goddard Space Flight Center. The author has contributed to research in topics: Plagioclase & Basalt. The author has an hindex of 21, co-authored 43 publications receiving 2539 citations.
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Partition coefficients of rare-earth elements between igneous matrix material and rock-forming mineral phenocrysts—II
TL;DR: In this paper, solid-liquid partition coefficients between phenocrysts and the host lavas have been measured for rare-earth elements by an isotope dilution technique and the consistency of much of the data suggests that most of the phenocryst crystallized under equilibrium, or quasi-equilibrium, conditions.
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Phenocryst-matrix partition coefficients for K, Rb, Sr and Ba, with applications to anorthosite and basalt genesis
TL;DR: Partition coefficients for K, Rb, Sr, and Ba distributed between plagioclase, K-feldspar, clinopyroxene, orthopyroxenes, mica, hornblende, garnet, and olivine phenocrysts and their igneous matrix materials, have been determined by a mass-spectrometric stable isotope dilution technique.
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Petrogenetic implications of some new geochemical data on eclogitic and ultrabasic inclusions
TL;DR: Some eclogitic and ultrabasic inclusions, their separated minerals, host rocks, and related samples have been analyzed by mass-spectrometric isotope dilution for K, Rb, Sr, Ba and rare-earth elements (RE), and by other techniques for selected major elements as discussed by the authors.
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Redox estimation from a calculation of Eu2+ and Eu3+ concentrations in natural phases
TL;DR: In this article, the equivalence of Eu2+ and Sr interphase partitioning permits the calculation of the Eu 2 and Eu 3+ concentrations in each of any two equilibrated phases of known Sr and rare-earth concentrations.
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Submarine basalts: some K, Rb, Sr, Ba, rare-earth, H2O, and CO2 data bearing on their alteration, modification by plagioclase, and possible source materials
TL;DR: In this paper, a simple model indicates eclogite or garnet peridotite as the most likely source rocks of alkali and submarine basalts, and the trace element data indicate that plagioclase has had an important effect in modifying composition.