World's Best Scientists 2026 revealed!
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Earth Science
USA
2026

D-Index & Metrics

Earth Science

D-Index
95
Citations
30281
World Ranking
185
National Ranking
91

Research.com Recognitions

  • 2026 - Research.com Earth Science in United States Leader Award
  • 2025 - Research.com Earth Science in United States Leader Award
  • 2009 - Fellow of American Geophysical Union (AGU)

Overview

Richard J. Walker is affiliated with the University of Maryland, College Park in the United States. Their research spans multiple disciplines with a primary focus on Physics and Astronomy as well as Earth and Planetary Sciences.

Their work prominently features in subfields such as Astronomy and Astrophysics, Geophysics, Ecology, Atmospheric Science, and Geochemistry and Petrology. The core topics they investigate include Astro and Planetary Science, Planetary Science and Exploration, Geological and Geochemical Analysis, Isotope Analysis in Ecology, High-pressure Geophysics and Materials, earthquake and tectonic studies, and Geology and Paleoclimatology Research.

They have contributed to numerous publications in a variety of scientific venues. The most frequent publication venues include:

  • Geochimica et Cosmochimica Acta
  • Meteoritics and Planetary Science
  • Science Advances
  • Chemical Geology
  • The Astrophysical Journal Letters

Recent published papers featuring Richard J. Walker include:

  • Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites (2022, Science)
  • Ryugu's nucleosynthetic heritage from the outskirts of the Solar System (2022, Science Advances)
  • Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2 (2022, Science Advances)
  • Contribution of Ryugu-like material to Earth's volatile inventory by Cu and Zn isotopic analysis (2022, Nature Astronomy)
  • Ultra-depleted 2.05 Ga komatiites of Finnish Lapland: Products of grainy late accretion or core-mantle interaction? (2020, Chemical Geology)

Richard J. Walker has collaborated extensively with frequent co-authors including:

  • Richard W. Carlson
  • K. Nagashima
  • Tetsuya Yokoyama
  • Izumi Nakai
  • Yoshinari Abe

In recognition of their contributions to geophysical sciences, Richard J. Walker was honored as a Fellow of the American Geophysical Union (AGU) in 2009.

Best Publications

  • Re-Os Ages of Group IIA, IIIA, IVA, and IVB Iron Meteorites

    Michael I. Smoliar;Richard J. Walker;John W. Morgan

  • Carius tube digestion for low-blank rhenium-osmium analysis

    Steven B. Shirey;Richard J. Walker

  • THE Re-Os ISOTOPE SYSTEM IN COSMOCHEMISTRY AND HIGH-TEMPERATURE GEOCHEMISTRY

    Steven B. Shirey;Richard J. Walker

  • Os, Sr, Nd, and Pb isotope systematics of southern African peridotite xenoliths: Implications for the chemical evolution of subcontinental mantle

    R.J Walker;R.W Carlson;S.B Shirey;Boyd F.R

  • Osmium isotopic compositions of mantle xenoliths: A global perspective

    Thomas Meisel;Richard J Walker;Anthony J Irving;Jean-Pierre Lorand

  • Highly siderophile element composition of the Earth’s primitive upper mantle: Constraints from new data on peridotite massifs and xenoliths

    H. Becker;H. Becker;M.F. Horan;R.J. Walker;S. Gao

  • Destruction of the North China Craton in the Mesozoic

    Fu-Yuan Wu;Jin-Hui Yang;Yi-Gang Xu;Simon A. Wilde

  • Recycling deep cratonic lithosphere and generation of intraplate magmatism in the North China Craton

    Shan Gao;Shan Gao;Roberta L. Rudnick;Wen-Liang Xu;Hong-Lin Yuan

  • Osmium isotopic constraints on the age of lithospheric mantle beneath northeastern China

    Fu-yuan Wu;Richard J. Walker;Xiang-wen Ren;De-you Sun

  • The osmium isotopic composition of the Earth's primitive upper mantle

    T. Meisel;T. Meisel;R. J. Walker;J. W. Morgan

  • The chemical-temporal evolution of lithospheric mantle underlying the North China Craton

    Fu Yuan Wu;Richard J. Walker;Yue Heng Yang;Hong Lin Yuan

  • Highly siderophile elements in the Earth, Moon and Mars: Update and implications for planetary accretion and differentiation

    Richard J. Walker

  • Highly siderophile elements in chondrites

    M.F. Horan;R.J. Walker;J.W. Morgan;J.N. Grossman

  • 190Pt–186Os and 187Re–187Os systematics of abyssal peridotites

    Alan D Brandon;Alan D Brandon;Jonathan E Snow;Richard J Walker;John W Morgan;John W Morgan

  • The absence of lithium isotope fractionation during basalt differentiation: new measurements by multicollector sector ICP-MS

    Paul B. Tomascak;Fouad Tera;Rosalind T. Helz;Richard J. Walker

  • Coupled 186Os and 187Os evidence for core-mantle interaction

    A. D. Brandon;Richard Walker;John W. Morgan;Marc D. Norman

  • Comparative 187Re-187Os systematics of chondrites: Implications regarding early solar system processes

    R.J Walker;M.F Horan;J.W Morgan;H Becker

  • Temporal Evolution of the Lithospheric Mantle beneath the Eastern North China Craton

    Zhu-Yin Chu;Fu-Yuan Wu;Richard J. Walker;Roberta L. Rudnick

  • The osmium isotopic composition of convecting upper mantle deduced from ophiolite chromites

    Richard J. Walker;Hazel Margaret Prichard;Akira Ishiwatari;Marcio Pimentel

  • RE-OS ISOTOPIC EVIDENCE FOR AN ENRICHED-MANTLE SOURCE FOR THE NORIL'SK-TYPE, ORE-BEARING INTRUSIONS, SIBERIA

    R.J Walker;J.W Morgan;M.F Horan;G.K Czamanske

  • 186Os–187Os systematics of Hawaiian picrites

    Alan D. Brandon;Marc D. Norman;Richard J. Walker;John W. Morgan;John W. Morgan

Frequent Co-Authors

James M.D. Day
James M.D. Day University of California, San Diego
Mary F. Horan
Mary F. Horan Carnegie Institution for Science
Igor S. Puchtel
Igor S. Puchtel University of Maryland, College Park
John W. Morgan
John W. Morgan University of Maryland, College Park
William F. McDonough
William F. McDonough University of Maryland, College Park
Alan D. Brandon
Alan D. Brandon University of Houston
Richard W. Carlson
Richard W. Carlson Carnegie Institution for Science
Timothy J. McCoy
Timothy J. McCoy National Museum of Natural History
Roberta L. Rudnick
Roberta L. Rudnick University of California, Santa Barbara
Harry Becker
Harry Becker Freie Universität Berlin

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