Member Since 1983
Richard J J. Walker
Distinguished University Professor, University of Maryland College Park
AGU Research
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182W-142Nd anomalies in ancient and modern rocks reflect multiple primordial mantle processes
AGU 2024
study of earth's deep interior | 11 december 2024
Richard J. Walker
The 182Hf→182W and 146Sm→142Nd short-lived systems are characterized by half-lives of ~9 and 103 Myr, respectively. Positive and negative anomalies pr...
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Tungsten-182 isotopic systematics of the Hawaiian mantle plume
AGU 2024
volcanology, geochemistry and petrology | 09 december 2024
Lori N. Willhite, Val Finlayson, Nicole Williamson...
Negative µ182W values in ocean island basalts (where µ182W is the deviation in 182W/184W from standards, in ppm) may result from isotopic equilibratio...
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Mass-Independent Osmium Isotopic Compositions of Bulk Planetesimals
AGU 2024
planetary sciences | 09 december 2024
Kiran Almas, Richard J. Walker
Mass-independent nucleosynthetic signatures can serve as genetic markers that distinguish between materials from the inner and outer Solar System, des...
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Analyzing the Mineralogy and Space Weathering Characteristics of the Finest Fraction in Apollo Core Sample 73002
JOURNAL OF GEOPHYSICAL RESEARCH: PLANETS
08 november 2024
James McFadden, Caitlin Ahrens, Judith Allton, Cec...
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On the composition of FOZO and similar mantle reservoirs: A critical examination and a defining role for tungsten isotopes
NEXT-GENERATION MINERALOGY, PETROLOGY, AND GEOCHEMISTRY: NEW APPROACHES TO HARNESSING THE MULTIDIMENSIONALITY OF COMPLEX EARTH AND PLANETARY SYSTEMS I POSTER
volcanology, geochemistry and petrology | 15 december 2023
Val Finlayson, Richard J. Walker, Katherine R. Ber...
The existence of a globally ubiquitous and geochemically distinctive mantle reservoir has been known for decades. Various terms, while defined using i...
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Revisiting the Composition of Earth’s Late-Stage Building Blocks
PLANETARY FORMATION AND DIFFERENTIATION IN THE INNER SOLAR SYSTEM: FROM MOLECULAR CLOUD TO ROCKY PLANETS II ORAL
study of earth's deep interior | 13 december 2023
Katherine R. Bermingham, Richard J. Walker, Linda ...
The siderophile (iron-loving) elements Mo and Ru are well suited to investigating the mass-independent nucleosynthetic (i.e., genetic) signatures of E...
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Evidence for the BSE-like 182W Composition of the Mantle at 2.0 Ga
CHEMISTRY AND EVOLUTION OF EARTH’S INTERIOR AS RECORDED BY MANTLE PLUMES I POSTER
volcanology, geochemistry and petrology | 13 december 2023
Igor S. Puchtel, Jan L. Hellmann, Hanika Rizo, Jan...
The highly heterogeneous nature of the early Earth's mantle and long-term preservation of these heterogeneities are well established on the basis of s...
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Geochemical and Geophysical implications for the source of Ocean Island Basalts
THE MAGMATIC PLUMBING SYSTEMS OF OCEANIC ISLANDS I ORAL
volcanology, geochemistry and petrology | 16 december 2021
Andrea Mundl-Petermeier, Marie-Theres Herret, Brad...
Analytical advancements in the past five years have revealed distinct isotopic signatures in some ocean island basalts (OIB). In particular, 182Hf-182...
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