RJ
Member Since 1983
Richard J J. Walker
Distinguished University Professor, University of Maryland College Park
AGU Research
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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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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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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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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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Sequencing core diffracting seismic phases: implications for mega-ULVZ properties
EXPLORING MULTISCALE SOLID-EARTH DYNAMICS USING COMPUTATIONAL METHODS AND HIGH-PERFORMANCE COMPUTING I ORAL
study of earth's deep interior | 15 december 2021
Doyeon Kim, Vedran Lekic, Andrea Mundl-Petermeier,...
Mega ultralow-velocity zones (mega-ULVZs) are large zones of anomalously reduced seismic velocities at the lowermost mantle. These mesoscale (~1000 km...
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Tungsten-182 isotopic compositions of granitic rocks from the Black Hills, South Dakota.
INTERDISCIPLINARY PERSPECTIVES ON INTRAPLATE MAGMATISM, MANTLE PLUMES, AND THE DEEP EARTH – BOTH PAST AND PRESENT II POSTER
study of earth's deep interior | 14 december 2021
Nao Nakanishi, Igor S. Puchtel, Richard J. Walker,...
Most Eoarchean rocks are characterized by positive μ182W anomalies (ppm difference in 182W/184W between sample and standards) averaging ~13 ppm. These...
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Tungsten-182 variability in ocean island basalts from combined geochemical and geophysical perspectives
INTERDISCIPLINARY PERSPECTIVES ON INTRAPLATE MAGMATISM, MANTLE PLUMES, AND THE DEEP EARTH – BOTH PAST AND PRESENT I ORAL
study of earth's deep interior | 14 december 2021
Val Finlayson, Doyeon Kim, Richard J. Walker, Jame...
With a half-life of 8.9 Myr, effectively all lithophile 182Hf decayed to siderophile 182W by ~60 Myr after initial Earth accretion. Hence, the 182Hf-1...
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New Insights to the Origin of Ultramafic-Mafic Magmatism, Gorgona Island, Colombia
INTERDISCIPLINARY PERSPECTIVES ON INTRAPLATE MAGMATISM, MANTLE PLUMES, AND THE DEEP EARTH – BOTH PAST AND PRESENT I ORAL
study of earth's deep interior | 14 december 2021
Richard J. Walker, Andrea Mundl-Petermeier, Igor S...
Mafic-ultramafic volcanism in evidence throughout portions of Central America and northern South America, including Gorgona Island, Colombia, was like...
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