J
John W. Morgan
Researcher at University of Maryland, College Park
Publications - 114
Citations - 10393
John W. Morgan is an academic researcher from University of Maryland, College Park. The author has contributed to research in topics: Chondrite & Meteorite. The author has an hindex of 52, co-authored 94 publications receiving 9846 citations. Previous affiliations of John W. Morgan include University of Chicago & Colorado State University.
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Journal ArticleDOI
Re-Os Ages of Group IIA, IIIA, IVA, and IVB Iron Meteorites
TL;DR: In this article, negative thermal ionization mass spectrometry with modified digestion and equilibration techniques was used to determine the rhenium and osmium concentrations and ratios of group IIA, IIIA, IVA, and IVB iron meteorites.
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The remarkable Re-Os chronometer in molybdenite : how and why it works
TL;DR: In this paper, the authors used the Re-Os (rhenium-osmium) chronometer applied to molybdenite (MoS2) to determine the age.
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Preparation and certification of Re-Os dating reference materials: Molybdenites HLP and JDC
Andao Du,Shuqi Wu,Dezhong Sun,Shuxian Wang,Wenjun Qu,R. J. Markey,Holly Stain,Holly Stain,John W. Morgan,Dmitry Malinovskiy +9 more
TL;DR: In this paper, two reference material molybdenites were prepared for Re-Os dating using homogeneous analysis of variance test and an isotope dilution method, which proved to be homogeneous, based on the coefficient of variation of analytical results.
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Chemical Composition of Earth, Venus, and Mercury
John W. Morgan,Edward Anders +1 more
TL;DR: Review of available data shows only a few gross trends for the inner planets: FeO decreases with heliocentric distance, whereas volatiles are depleted and refractories are enriched in the smaller planets.
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The osmium isotopic composition of the Earth's primitive upper mantle
TL;DR: In this article, the authors derived a minimum 187Os/188Os ratio for PUM of 0.1290 ± 0.0009, by using a correlation between 187Os and geochemical indices of fertility.