World's Best Scientists 2026 revealed!
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Earth Science
South Africa
2026

D-Index & Metrics

Earth Science

D-Index
52
Citations
15114
World Ranking
2969
National Ranking
12

John D. Clemens publication distribution in Earth Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Earth Science in 2026. The highlighted bar marks where John D. Clemens sits on this spectrum.

38–47 publications: 5 scientists 48–57 publications: 33 scientists 58–67 publications: 94 scientists 68–77 publications: 161 scientists 78–87 publications: 278 scientists 88–97 publications: 376 scientists 98–107 publications: 404 scientists 108–117 publications: 484 scientists 118–127 publications: 540 scientists 128–137 publications: 557 scientists 138–147 publications: 491 scientists 148–157 publications: 495 scientists 158–167 publications: 458 scientists 168–177 publications: 490 scientists 178–187 publications: 414 scientists 188–197 publications: 401 scientists 198–207 publications: 333 scientists 208–217 publications: 292 scientists 218–227 publications: 290 scientists 228–237 publications: 262 scientists 238–247 publications: 243 scientists 248–257 publications: 208 scientists 258–267 publications: 185 scientists 268–277 publications: 147 scientists 278–287 publications: 128 scientists 288–297 publications: 119 scientists 298–307 publications: 120 scientists 308–317 publications: 107 scientists 318–327 publications: 93 scientists 328–337 publications: 87 scientists 338–347 publications: 64 scientists 348–357 publications: 87 scientists 358–367 publications: 60 scientists 368–377 publications: 60 scientists 378–387 publications: 34 scientists 388–397 publications: 50 scientists 398–407 publications: 44 scientists 408–417 publications: 31 scientists 418–427 publications: 39 scientists 428–437 publications: 27 scientists 438–447 publications: 36 scientists 448–457 publications: 27 scientists 458–467 publications: 29 scientists 468–477 publications: 30 scientists 478–487 publications: 19 scientists 488–497 publications: 15 scientists 498–507 publications: 18 scientists 508–517 publications: 19 scientists 518–527 publications: 16 scientists 528–537 publications: 10 scientists 538–547 publications: 11 scientists 548–557 publications: 14 scientists 558–567 publications: 11 scientists 568–577 publications: 7 scientists 578–587 publications: 14 scientists 588–597 publications: 5 scientists 598–602 publications: 4 scientists 603+ publications: 100 scientists
38 publications 603+

This scientist: 137 publications — 32nd percentile

32% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 603 publications or more.

John D. Clemens D-index placement in Earth Science in 2026

The chart shows the D-index (discipline H-index) distribution of Earth Science scientists ranked by Research.com in 2026. The highlighted bar marks where John D. Clemens sits on this spectrum.

30 D-Index: 144 scientists 31 D-Index: 215 scientists 32 D-Index: 278 scientists 33 D-Index: 379 scientists 34 D-Index: 366 scientists 35 D-Index: 372 scientists 36 D-Index: 389 scientists 37 D-Index: 366 scientists 38 D-Index: 344 scientists 39 D-Index: 349 scientists 40 D-Index: 296 scientists 41 D-Index: 289 scientists 42 D-Index: 277 scientists 43 D-Index: 279 scientists 44 D-Index: 248 scientists 45 D-Index: 257 scientists 46 D-Index: 212 scientists 47 D-Index: 202 scientists 48 D-Index: 207 scientists 49 D-Index: 204 scientists 50 D-Index: 183 scientists 51 D-Index: 178 scientists 52 D-Index: 182 scientists 53 D-Index: 178 scientists 54 D-Index: 163 scientists 55 D-Index: 117 scientists 56 D-Index: 163 scientists 57 D-Index: 120 scientists 58 D-Index: 113 scientists 59 D-Index: 136 scientists 60 D-Index: 135 scientists 61 D-Index: 96 scientists 62 D-Index: 103 scientists 63 D-Index: 83 scientists 64 D-Index: 103 scientists 65 D-Index: 83 scientists 66 D-Index: 89 scientists 67 D-Index: 92 scientists 68 D-Index: 89 scientists 69 D-Index: 78 scientists 70 D-Index: 75 scientists 71 D-Index: 53 scientists 72 D-Index: 62 scientists 73 D-Index: 54 scientists 74 D-Index: 35 scientists 75 D-Index: 52 scientists 76 D-Index: 50 scientists 77 D-Index: 32 scientists 78 D-Index: 37 scientists 79 D-Index: 20 scientists 80 D-Index: 33 scientists 81 D-Index: 36 scientists 82 D-Index: 34 scientists 83 D-Index: 34 scientists 84 D-Index: 24 scientists 85 D-Index: 19 scientists 86 D-Index: 18 scientists 87 D-Index: 26 scientists 88 D-Index: 30 scientists 89 D-Index: 17 scientists 90 D-Index: 21 scientists 91 D-Index: 19 scientists 92 D-Index: 15 scientists 93 D-Index: 14 scientists 94 D-Index: 20 scientists 95 D-Index: 9 scientists 96 D-Index: 10 scientists 97 D-Index: 15 scientists 98 D-Index: 13 scientists 99 D-Index: 3 scientists 100 D-Index: 13 scientists 101 D-Index: 3 scientists 102 D-Index: 9 scientists 103 D-Index: 4 scientists 104 D-Index: 6 scientists 105 D-Index: 6 scientists 106+ D-Index: 98 scientists
30 D-Index 106+

This scientist: 52 D-Index — 68th percentile

68% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 106 D-Index or more.

Research.com Recognitions

  • 2026 - Research.com Earth Science in South Africa Leader Award
  • 2025 - Research.com Earth Science in South Africa Leader Award

Overview

John D. Clemens is affiliated with Stellenbosch University in South Africa. Their research spans primarily across Earth and Planetary Sciences and Computer Science, with a significant emphasis on geophysics and artificial intelligence within these broader fields.

The main topics of Clemens's work include geological and geochemical analysis, geochemistry and geologic mapping, high-pressure geophysics and materials, earthquake and tectonic studies, geological and geophysical studies, paleontology and stratigraphy of fossils, and geology and paleoclimatology research.

Clemens has published extensively in various scientific journals and contributed to multiple fields. Frequent publication venues include:

  • Australian Journal of Earth Sciences
  • Contributions to Mineralogy and Petrology
  • arXiv (Cornell University)
  • Earth-Science Reviews
  • South African Journal of Geology

Frequent collaborators in Clemens's research include Gary Stevens, Matthew Jason Mayne, Nick Petford, Alexander Kisters, and G. Neil Phillips.

Selected recent papers by Clemens cover several aspects of geological sciences. These papers include:

  • "Comparative safety of mRNA COVID-19 vaccines to influenza vaccines: A pharmacovigilance analysis using WHO international database," 2021, Journal of Medical Virology
  • "Igneous differentiation by deformation," 2020, Contributions to Mineralogy and Petrology
  • "How are silicic volcanic and plutonic systems related? Part 1: A review of geological and geophysical observations, and insights from igneous rock chemistry," 2022, Earth-Science Reviews
  • "Do arc silicic magmas form by fluid-fluxed melting of older arc crust or fractionation of basaltic magmas?" 2021, Contributions to Mineralogy and Petrology
  • "Mafic schlieren, crystal accumulation and differentiation in granitic magmas: an integrated case study," 2020, Contributions to Mineralogy and Petrology

Best Publications

  • Origin of an A-type granite; experimental constraints

    J. D. Clemens;John R. Holloway;A. J. R. White

  • Origin of high-potassium, talc-alkaline, I-type granitoids

    Malcolm P. Roberts;John D. Clemens

  • Constraints on melting and magma production in the crust

    J.D. Clemens;D. Vielzeuf

  • Granitic magma transport by fracture propagation

    J.D. Clemens;C.K. Mawer

  • S-type granitic magmas—petrogenetic issues, models and evidence

    J.D. Clemens

  • Origin and crystallization of some peraluminous (S-type) granitic magmas

    John D. Clemens;Victor J. Wall

  • What controls chemical variation in granitic magmas

    J.D. Clemens;G. Stevens

  • Melt production during granulite-facies anatexis: experimental data from “primitive” metasedimentary protoliths

    Gary Stevens;John D. Clemens;Giles T. R. Droop

  • The enigmatic sources of I-type granites: The peritectic connexion

    J.D. Clemens;G. Stevens;F. Farina

  • Archaean TTGs as sources of younger granitic magmas: melting of sodic metatonalites at 0.6–1.2 GPa

    J. M. Watkins;J. D. Clemens;P. J. Treloar

  • Origin of potassic (C-type) adakite magmas: Experimental and field constraints

    L. Xiao;J.D. Clemens

  • Models for Granitoid Evolution and Source Compositions

    V. J. Wall;J. D. Clemens;D. B. Clarke

  • The Granulite — Granite Connexion

    J. D. Clemens

  • Granites, Granulites, and Crustal Differentiation

    D. Vielzeuf;J. D. Clemens;C. Pin;E. Moinet

  • Petrogenesis and Experimental petrology of granitic rocks

    Unknown

  • Origin and evolution of a peraluminous silicic ignimbrite suite: The Violet Town Volcanics

    John D. Clemens;Victor J. Wall

  • Late Triassic granitoids of the eastern margin of the Tibetan Plateau: Geochronology, petrogenesis and implications for tectonic evolution

    L. Xiao;H.F. Zhang;J.D. Clemens;Q.W. Wang

  • The Nature and Origin of Granite

    Unknown

  • The fluid regime of high-temperature metamorphism during granitoid magma genesis

    J.D. Clemens;J.M. Watkins

  • Petrogenesis of Mafic to Felsic Plutonic Rock Associations: the Calc-alkaline Quérigut Complex, French Pyrenees

    Malcolm P. Roberts;Christian Pin;John D. Clemens;Jean-Louis Paquette

  • Fluid-absent melting and the roles of fluids in the lithosphere: a slanted summary?

    G. Stevens;J.D. Clemens

  • Water contents of silicic to intermediate magmas

    J.D. Clemens

  • Plate tectonics and crustal evolution: Condie, K. C. 1989. (third edition). Pergamon Press, Oxford. 476 pp. Price £55.50, $100.00 (hardback); £30.00, $49.50 (softback)

    Unknown

Frequent Co-Authors

Gary Stevens
Gary Stevens Stellenbosch University
Nick Petford
Nick Petford Durham University
Ian S. Buick
Ian S. Buick Stellenbosch University
Dirk Frei
Dirk Frei University of the Western Cape
Marlina Elburg
Marlina Elburg University of Johannesburg
Ron H. Vernon
Ron H. Vernon Macquarie University
A. J. R. White
A. J. R. White University of Melbourne
Marian B. Holness
Marian B. Holness University of Cambridge
Christian Pin
Christian Pin Centre national de la recherche scientifique, CNRS
John R. Holloway
John R. Holloway Arizona State University

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