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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 54 2657 2419 1106 981 132 12673

Thomas M. McCollom publications per year

The chart shows the history of publications by Thomas M. McCollom between 1987 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Thomas M. McCollom published across 39 years, from 1987 to 2025, averaging 3.8 papers a year. Output peaked at 14 publications in 2013. 5 of the 149 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1987 to 2025. Vertical axis: number of publications, 0 to 14. Peak 14 publications in 2013. 1987: 1 publication 1988: 0 publications 1989: 1 publication 1990: 0 publications 1991: 1 publication 1992: 0 publications 1993: 1 publication 1994: 0 publications 1995: 1 publication 1996: 1 publication 1997: 1 publication 1998: 2 publications 1999: 4 publications 2000: 1 publication 2001: 4 publications 2002: 2 publications 2003: 6 publications 2004: 1 publication 2005: 8 publications 2006: 8 publications 2007: 3 publications 2008: 4 publications 2009: 8 publications 2010: 6 publications 2011: 8 publications 2012: 3 publications 2013: 14 publications 2014: 4 publications 2015: 2 publications 2016: 7 publications 2017: 4 publications 2018: 6 publications 2019: 5 publications 2020: 5 publications 2021: 5 publications 2022: 6 publications 2023: 11 publications 2024: 2 publications 2025: 3 publications
1987 2025

149 publications in total across all disciplines

View publications per year as a table
Thomas M. McCollom: publications per year, 1987 to 2025
Year Publications
1987 1
1988 0
1989 1
1990 0
1991 1
1992 0
1993 1
1994 0
1995 1
1996 1
1997 1
1998 2
1999 4
2000 1
2001 4
2002 2
2003 6
2004 1
2005 8
2006 8
2007 3
2008 4
2009 8
2010 6
2011 8
2012 3
2013 14
2014 4
2015 2
2016 7
2017 4
2018 6
2019 5
2020 5
2021 5
2022 6
2023 11
2024 2
2025 3
Total 149
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Thomas M. McCollom 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 Thomas M. McCollom sits on this spectrum.

No. of scientists
100 200 300 400 500
Bar chart with 58 bars. Horizontal axis: publications, 38–47 to 603+. Vertical axis: number of scientists, 0 to 557. Most scientists, 557, have 128–137 publications. The last bar groups every scientist with 603 publications or more. The highlighted bar, 128–137 publications, is where this scientist sits. 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
38–47 publications 603+

This scientist: 132 publications — 29th percentile

29% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Earth Science scientists by publication count, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
Publications Scientists This scientist
38–47 5
48–57 33
58–67 94
68–77 161
78–87 278
88–97 376
98–107 404
108–117 484
118–127 540
128–137 557 132
138–147 491
148–157 495
158–167 458
168–177 490
178–187 414
188–197 401
198–207 333
208–217 292
218–227 290
228–237 262
238–247 243
248–257 208
258–267 185
268–277 147
278–287 128
288–297 119
298–307 120
308–317 107
318–327 93
328–337 87
338–347 64
348–357 87
358–367 60
368–377 60
378–387 34
388–397 50
398–407 44
408–417 31
418–427 39
428–437 27
438–447 36
448–457 27
458–467 29
468–477 30
478–487 19
488–497 15
498–507 18
508–517 19
518–527 16
528–537 10
538–547 11
548–557 14
558–567 11
568–577 7
578–587 14
588–597 5
598–602 4
603+ 100
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Thomas M. McCollom 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 Thomas M. McCollom sits on this spectrum.

No. of scientists
100 200 300
Bar chart with 77 bars. Horizontal axis: D-Index, 30 to 106+. Vertical axis: number of scientists, 0 to 389. Most scientists, 389, have 36 D-Index. The last bar groups every scientist with 106 D-Index or more. The highlighted bar, 54 D-Index, is where this scientist sits. 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: 54 D-Index — 71st percentile

71% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Earth Science scientists by D-index, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
D-Index Scientists This scientist
30 144
31 215
32 278
33 379
34 366
35 372
36 389
37 366
38 344
39 349
40 296
41 289
42 277
43 279
44 248
45 257
46 212
47 202
48 207
49 204
50 183
51 178
52 182
53 178
54 163 54
55 117
56 163
57 120
58 113
59 136
60 135
61 96
62 103
63 83
64 103
65 83
66 89
67 92
68 89
69 78
70 75
71 53
72 62
73 54
74 35
75 52
76 50
77 32
78 37
79 20
80 33
81 36
82 34
83 34
84 24
85 19
86 18
87 26
88 30
89 17
90 21
91 19
92 15
93 14
94 20
95 9
96 10
97 15
98 13
99 3
100 13
101 3
102 9
103 4
104 6
105 6
106+ 98
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Overview

Thomas M. McCollom is a researcher affiliated with the University of Colorado Boulder in the United States. Their work primarily spans the fields of Physics and Astronomy, Environmental Science, and Earth and Planetary Sciences, with a focused presence in subfields including Astronomy and Astrophysics, Environmental Chemistry, Geophysics, Molecular Biology, and Ecology.

Their research explores key topics such as Astro and Planetary Science, Methane Hydrates and Related Phenomena, Planetary Science and Exploration, Microbial Community Ecology and Physiology, Geological and Geochemical Analysis, Paleontology and Stratigraphy of Fossils, along with Geology and Paleoclimatology Research.

Recent notable publications include:

  • Hydrogen and Abiotic Hydrocarbons: Molecules that Change the World, 2020, published in Elements
  • Hydrogen generation and iron partitioning during experimental serpentinization of an olivine-pyroxene mixture, 2020, published in Geochimica et Cosmochimica Acta
  • Hydrogen generation from serpentinization of iron-rich olivine on Mars, icy moons, and other planetary bodies, 2021, published in Icarus
  • The effect of pH on rates of reaction and hydrogen generation during serpentinization, 2020, published in Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences
  • A dynamic microbial sulfur cycle in a serpentinizing continental ophiolite, 2020, published in Environmental Microbiology

McCollom frequently publishes in venues such as Geochimica et Cosmochimica Acta, Abstracts with programs - Geological Society of America, American Mineralogist, Goldschmidt2022 abstracts, and Zenodo (CERN European Organization for Nuclear Research).

Collaborative efforts feature several frequent co-authors, including Tori M. Hoehler, Frieder Klein, Bruce M. Moskowitz, P. Sølheid, and Matthew O. Schrenk.

The research interests reflected in McCollom's work focus on processes related to serpentinization, hydrogen generation, and the chemical energy sources relevant to planetary and environmental sciences. Their studies include reaction rates, geochemical cycling, and microbial interactions in serpentinizing environments, often linking geological phenomena with broader planetary and astrobiological contexts.

Best Publications

  • Abiotic Synthesis of Organic Compounds in Deep-Sea Hydrothermal Environments

    Thomas M McCollom;Jeffrey S Seewald

  • Thermodynamic constraints on hydrogen generation during serpentinization of ultramafic rocks

    Thomas M. McCollom;Wolfgang Bach

  • Lipid synthesis under hydrothermal conditions by Fischer-Tropsch-type reactions.

    Thomas M. McCollom;Gilles Ritter;Bernd R. T. Simoneit

  • Geochemical constraints on chemolithoautotrophic metabolism by microorganisms in seafloor hydrothermal systems

    Thomas M. McCollom;Everett L. Shock

  • A reassessment of the potential for reduction of dissolved CO 2 to hydrocarbons during serpentinization of olivine

    Thomas M McCollom;Jeffrey S Seewald

  • Carbon isotope composition of organic compounds produced by abiotic synthesis under hydrothermal conditions

    Thomas M. McCollom;Jeffrey S. Seewald

  • Hydrogen and bioenergetics in the Yellowstone geothermal ecosystem.

    John R. Spear;Jeffrey J. Walker;Thomas M. McCollom;Norman R. Pace

  • Isolation and Characterization of Novel Psychrophilic, Neutrophilic, Fe-Oxidizing, Chemolithoautotrophic α- and γ-Proteobacteria from the Deep Sea

    Katrina J. Edwards;Daniel R. Rogers;Carl O. Wirsen;Thomas M. McCollom

  • Iron partitioning and hydrogen generation during serpentinization of abyssal peridotites from 15°N on the Mid-Atlantic Ridge

    Frieder Klein;Wolfgang Bach;Niels Jöns;Thomas M McCollom

  • Serpentinization and its implications for life on the early Earth and Mars.

    Mitch Schulte;David Blake;Tori M Hoehler;Thomas M McCollom

  • Compositional controls on hydrogen generation during serpentinization of ultramafic rocks

    Frieder Klein;Wolfgang Bach;Thomas M. McCollom

  • Geomicrobiology in oceanography: microbe–mineral interactions at and below the seafloor

    Katrina J. Edwards;Wolfgang Bach;Thomas M. McCollom

  • Laboratory Simulations of Abiotic Hydrocarbon Formation in Earth’s Deep Subsurface

    Thomas M. McCollom

  • Experimental investigation of single carbon compounds under hydrothermal conditions

    Jeffrey S. Seewald;Mikhail Yu. Zolotov;Thomas M. McCollom

  • Biosignature Preservation and Detection in Mars Analog Environments

    Lindsay E Hays;Heather V Graham;David J Des Marais;Elisabeth M Hausrath

  • Hydrogen generation from low-temperature water-rock reactions

    L. E. Mayhew;E. T. Ellison;T. M. McCollom;T. P. Trainor

  • Experimental constraints on the hydrothermal reactivity of organic acids and acid anions: I. Formic acid and formate

    Thomas M. McCollom;Jeffrey S. Seewald

  • Catabolic and anabolic energy for chemolithoautotrophs in deep-sea hydrothermal systems hosted in different rock types

    Jan P. Amend;Thomas M. McCollom;Michael Hentscher;Wolfgang Bach

  • Abiotic methane formation during experimental serpentinization of olivine

    Thomas M McCollom

  • Methanogenesis as a potential source of chemical energy for primary biomass production by autotrophic organisms in hydrothermal systems on Europa

    Thomas M. McCollom

  • Geochemical constraints on sources of metabolic energy for chemolithoautotrophy in ultramafic-hosted deep-sea hydrothermal systems.

    Thomas M. McCollom

Frequent Co-Authors

Jeffrey S. Seewald
Jeffrey S. Seewald Woods Hole Oceanographic Institution
Wolfgang Bach
Wolfgang Bach University of Bremen
Tori M. Hoehler
Tori M. Hoehler Ames Research Center
Frieder Klein
Frieder Klein Woods Hole Oceanographic Institution
Katrina J. Edwards
Katrina J. Edwards University of Southern California
Everett L. Shock
Everett L. Shock Arizona State University
Alexis S. Templeton
Alexis S. Templeton University of Colorado Boulder
Bruce M. Jakosky
Bruce M. Jakosky University of Colorado Boulder
Jan P. Amend
Jan P. Amend University of Southern California
Bernd R.T. Simoneit
Bernd R.T. Simoneit Oregon State University

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