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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 58 2163 1962 223 202 148 11692

Clark R.L. Friend publications per year

The chart shows the history of publications by Clark R.L. Friend between 1977 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Clark R.L. Friend published across 49 years, from 1977 to 2025, averaging 3.1 papers a year. Output peaked at 9 publications in 1997. 2 of the 152 publications appeared in the last two years.

No. of publications
2 4 6 8
Bar chart. Horizontal axis: year, 1977 to 2025. Vertical axis: number of publications, 0 to 9. Peak 9 publications in 1997. 1977: 1 publication 1978: 1 publication 1979: 1 publication 1980: 1 publication 1981: 2 publications 1982: 2 publications 1983: 0 publications 1984: 2 publications 1985: 3 publications 1986: 3 publications 1987: 3 publications 1988: 4 publications 1989: 3 publications 1990: 0 publications 1991: 3 publications 1992: 2 publications 1993: 3 publications 1994: 2 publications 1995: 5 publications 1996: 6 publications 1997: 9 publications 1998: 3 publications 1999: 4 publications 2000: 3 publications 2001: 5 publications 2002: 7 publications 2003: 4 publications 2004: 5 publications 2005: 4 publications 2006: 3 publications 2007: 9 publications 2008: 4 publications 2009: 6 publications 2010: 7 publications 2011: 2 publications 2012: 1 publication 2013: 3 publications 2014: 0 publications 2015: 4 publications 2016: 3 publications 2017: 2 publications 2018: 0 publications 2019: 5 publications 2020: 2 publications 2021: 4 publications 2022: 2 publications 2023: 2 publications 2024: 1 publication 2025: 1 publication
1977 2025

152 publications in total across all disciplines

View publications per year as a table
Clark R.L. Friend: publications per year, 1977 to 2025
Year Publications
1977 1
1978 1
1979 1
1980 1
1981 2
1982 2
1983 0
1984 2
1985 3
1986 3
1987 3
1988 4
1989 3
1990 0
1991 3
1992 2
1993 3
1994 2
1995 5
1996 6
1997 9
1998 3
1999 4
2000 3
2001 5
2002 7
2003 4
2004 5
2005 4
2006 3
2007 9
2008 4
2009 6
2010 7
2011 2
2012 1
2013 3
2014 0
2015 4
2016 3
2017 2
2018 0
2019 5
2020 2
2021 4
2022 2
2023 2
2024 1
2025 1
Total 152
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Clark R.L. Friend 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 Clark R.L. Friend 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, 148–157 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: 148 publications — 38th percentile

38% 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
138–147 491
148–157 495 148
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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Clark R.L. Friend 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 Clark R.L. Friend 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, 58 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: 58 D-Index — 77th percentile

77% 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
55 117
56 163
57 120
58 113 58
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

Clark R.L. Friend is affiliated with Oxford Brookes University in the United Kingdom. Their research primarily lies within Earth and Planetary Sciences, with a strong focus on geophysics and geology. The scientist has contributed extensively to studies involving geological and geochemical analysis as well as high-pressure geophysics and materials.

Their main fields of study include:

  • Earth and Planetary Sciences

Subfields of study involve:

  • Geophysics
  • Geology
  • Artificial Intelligence
  • Paleontology
  • Environmental Chemistry

Clark R.L. Friend's major research topics encompass:

  • Geological and Geochemical Analysis
  • High-pressure geophysics and materials
  • Earthquake and tectonic studies
  • Geological Studies and Exploration
  • Geochemistry and Geologic Mapping
  • Paleontology and Stratigraphy of Fossils
  • Methane Hydrates and Related Phenomena

The scientist has published several recent papers, prominently in the journal Precambrian Research and Earth and Planetary Science Letters. Notable works include:

  • "Eoarchean contrasting ultra-high-pressure to low-pressure metamorphisms (<250 to >1000 °C/GPa) explained by tectonic plate convergence in deep time" (2020), Precambrian Research
  • "Fifty years of the Eoarchean and the case for evolving uniformitarianism" (2021), Precambrian Research
  • "Isua (Greenland) ~3700 Ma meta-serpentinite olivine Mg# and δ18O signatures show connection between the early mantle and hydrosphere: Geodynamic implications" (2021), Precambrian Research
  • "Review of the Isua supracrustal belt area (Greenland) Eoarchean geology from integrated 1:20,000 scale maps, field observations and laboratory data: Constraints on early geodynamics" (2022), Precambrian Research
  • "In support of rare relict ∼3700 Ma stromatolites from Isua (Greenland)" (2021), Earth and Planetary Science Letters

Clark R.L. Friend frequently collaborates with a group of researchers, including Allen P. Nutman, Vickie C. Bennett, Martin J. Van Kranendonk, Keewook Yi, and Allan R. Chivas. Their work shows recurring partnerships with Allen P. Nutman and Vickie C. Bennett, who both have contributed to multiple publications together.

The scientist's frequent publication venues comprise:

  • Precambrian Research
  • Earth and Planetary Science Letters
  • Lithos
  • Earth-Science Reviews
  • Geoscience Frontiers

Best Publications

  • Evidence for life on Earth before 3,800 million years ago.

    S. J. Mojzsis;G. Arrhenius;K. D. McKeegan;T. M. Harrison

  • Rapid emergence of life shown by discovery of 3,700-million-year-old microbial structures

    Allen Phillip Nutman;Allen Phillip Nutman;Vickie C. Bennett;Clark R. L. Friend;Martin J. Van Kranendonk

  • The Itsaq Gneiss Complex of southern West Greenland; the world's most extensive record of early crustal evolution (3900-3600 Ma)

    Allen P. Nutman;Victor R. McGregor;Clark R.L. Friend;Victoria C. Bennett

  • Multistage late Neoarchaean crustal evolution of the North China Craton, eastern Hebei

    Allen P. Nutman;Yusheng Wan;Lilin Du;Clark R.L. Friend

  • Crustal Evolution of Singhbhum North Orissa Eastern India

    Unknown

  • Recognition of ≥3850 Ma water-lain sediments in West Greenland and their significance for the early Archaean Earth

    Allen P. Nutman;Stephen J. Mojzsis;Clark R.L. Friend

  • SHRIMP U-Pb Geochronology of the Closepet Granite and Peninsular Gneiss, Karnataka, South India

    C. R. L. Friend;A. P. Nutman

  • Meta-igneous (non-gneissic) tonalites and quartz-diorites from an extensive ca. 3800 Ma terrain south of the Isua supracrustal belt, southern West Greenland: constraints on early crust formation

    Allen P. Nutman;Vickie C. Bennett;Clark R. L. Friend;Marc D. Norman

  • New pieces to the Archaean terrane jigsaw puzzle in the Nuuk region, southern West Greenland: steps in transforming a simple insight into a complex regional tectonothermal model

    Clark R L Friend;Allen Phillip Nutman

  • ̃ 3710 and ⪖ 3790 Ma volcanic sequences in the Isua (Greenland) supracrustal belt; structural and Nd isotope implications

    Allen P. Nutman;Vickie C. Bennett;Clark R.L. Friend;Minik T. Rosing

  • Late Archaean terrane accretion in the Godthåb region, southern West Greenland

    C. R. L. Friend;A. P. Nutman;V. R. McGregor

  • New 1:20,000 scale geological maps, synthesis and history of investigation of the Isua supracrustal belt and adjacent orthogneisses, southern West Greenland: a glimpse of Eoarchaean crust formation and orogeny

    Allen P. Nutman;Clark R.L. Friend

  • TIMING OF LATE ARCHAEAN TERRANE ASSEMBLY, CRUSTAL THICKENING AND GRANITE EMPLACEMENT IN THE NUUK REGION, SOUTHERN WEST GREENLAND

    C.R.L. Friend;A.P. Nutman;H. Baadsgaard;P.D. Kinny

  • Evolution and assembly of Archean Gneiss Terranes in the Godthåbsfjord Region, southern west Greenland: Structural, metamorphic, and isotopic evidence

    Allen P. Nutman;Clark R. L. Friend;Halfdan Baadsgaard;Victor R. McGregor

  • Evidence for 3650–3600 Ma assembly of the northern end of the Itsaq Gneiss Complex, Greenland: Implication for early Archaean tectonics

    Allen P. Nutman;Clark R. L. Friend;Vickie C. Bennett

  • A reappraisal of the Lewisian Gneiss Complex: geochronological evidence for its tectonic assembly from disparate terranes in the Proterozoic

    C. R. L. Friend;P. D. Kinny

  • The early archaean Itsaq gneiss complex of Southern West Greenland: The importance of field observations in interpreting age and isotopic constraints for early terrestrial evolution

    Allen P Nutman;Allen P Nutman;Vickie C Bennett;Clark R.L Friend;Victor R Mcgregor

  • Provenance of the Moine Supergroup of NW Scotland: evidence from geochronology of detrital and inherited zircons from (meta)sedimentary rocks, granites and migmatites

    C.R.L. Friend;R.A. Strachan;P.D. Kinny;G.R. Watt

  • Adjacent terranes with ca. 2715 and 2650 Ma high-pressure metamorphic assemblages in the Nuuk region of the North Atlantic Craton, southern West Greenland: Complexities of Neoarchaean collisional orogeny

    Allen Phillip Nutman;Clark Friend

  • U-Pb isotopic evidence for the accretion of different crustal blocks to form the Lewisian Complex of northwest Scotland

    P. D. Kinny;C. R. L. Friend

  • New evidence for protolith ages of Lewisian granulites, northwest Scotland

    C. R. L. Friend;P. D. Kinny

Frequent Co-Authors

Allen P. Nutman
Allen P. Nutman University of Wollongong
Vickie C. Bennett
Vickie C. Bennett Australian National University
Peter D. Kinny
Peter D. Kinny Curtin University
Allan R. Chivas
Allan R. Chivas University of Wollongong
Martin J. Van Kranendonk
Martin J. Van Kranendonk Curtin University
Marc D. Norman
Marc D. Norman Australian National University
Dunyi Liu
Dunyi Liu Chinese Academy of Geological Sciences
Rob Strachan
Rob Strachan University of Portsmouth
Hiroshi Hidaka
Hiroshi Hidaka Nagoya University
Stephen J. Mojzsis
Stephen J. Mojzsis University of Bayreuth

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