World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 35 7669 7102 2603 2301 174 4302

Kouki Kitajima publications per year

The chart shows the history of publications by Kouki Kitajima between 2001 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Kouki Kitajima published across 25 years, from 2001 to 2025, averaging 8.4 papers a year. Output peaked at 24 publications in 2017. 28 of the 209 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 2001 to 2025. Vertical axis: number of publications, 0 to 24. Peak 24 publications in 2017. 2001: 1 publication 2002: 0 publications 2003: 3 publications 2004: 0 publications 2005: 1 publication 2006: 3 publications 2007: 2 publications 2008: 3 publications 2009: 2 publications 2010: 3 publications 2011: 1 publication 2012: 4 publications 2013: 9 publications 2014: 7 publications 2015: 5 publications 2016: 14 publications 2017: 24 publications 2018: 17 publications 2019: 13 publications 2020: 15 publications 2021: 15 publications 2022: 16 publications 2023: 23 publications 2024: 17 publications 2025: 11 publications
2001 2025

209 publications in total across all disciplines

View publications per year as a table
Kouki Kitajima: publications per year, 2001 to 2025
Year Publications
2001 1
2002 0
2003 3
2004 0
2005 1
2006 3
2007 2
2008 3
2009 2
2010 3
2011 1
2012 4
2013 9
2014 7
2015 5
2016 14
2017 24
2018 17
2019 13
2020 15
2021 15
2022 16
2023 23
2024 17
2025 11
Total 209
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Kouki Kitajima 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 Kouki Kitajima 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, 168–177 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: 174 publications — 52nd percentile

52% 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
158–167 458
168–177 490 174
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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Kouki Kitajima 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 Kouki Kitajima 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, 35 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: 35 D-Index — 19th percentile

19% 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 35
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
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

Kouki Kitajima is affiliated with the University of Wisconsin-Madison in the United States. Their research primarily spans the fields of Earth and Planetary Sciences and Physics and Astronomy, with significant contributions to subfields such as Geophysics, Astronomy and Astrophysics, Ecology, Atmospheric Science, and Paleontology.

The scientist's work focuses on several main topics, including Geological and Geochemical Analysis, Astro and Planetary Science, High-pressure Geophysics and Materials, Planetary Science and Exploration, Isotope Analysis in Ecology, earthquake and tectonic studies, and Geology and Paleoclimatology Research.

Frequent publication venues for Kouki Kitajima include:

  • Abstracts with programs - Geological Society of America
  • Science Advances
  • American Mineralogist
  • Geochimica et Cosmochimica Acta
  • Contributions to Mineralogy and Petrology

The scientist has co-authored numerous publications with researchers such as John W. Valley, N. T. Kita, Tsuyoshi Iizuka, Tetsuya Yokoyama, and K. Nagashima.

Recent papers authored or co-authored by Kouki Kitajima 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
  • Destabilization of Long-Lived Hadean Protocrust and the Onset of Pervasive Hydrous Melting at 3.8 Ga, 2022, AGU Advances
  • Contribution of Ryugu-like material to Earth's volatile inventory by Cu and Zn isotopic analysis, 2022, Nature Astronomy

Best Publications

  • Magmatic evolution and crustal recycling for Neoproterozoic strongly peraluminous granitoids from southern China: Hf and O isotopes in zircon

    Xiao-Lei Wang;Xiao-Lei Wang;Jin-Cheng Zhou;Yu-Sheng Wan;Kouki Kitajima

  • SIMS analyses of the oldest known assemblage of microfossils document their taxon-correlated carbon isotope compositions.

    J. William Schopf;Kouki Kitajima;Michael J. Spicuzza;Anatoliy B. Kudryavtsev

  • Two-stage partial melting and contrasting cooling history within the Higher Himalayan Crystalline Sequence in the far-eastern Nepal Himalaya

    Takeshi Imayama;Toru Takeshita;Keewook Yi;Deung Lyong Cho

  • Seafloor hydrothermal alteration at an Archaean mid‐ocean ridge

    K. Kitajima;S. Maruyama;S. Utsunomiya;S. Utsunomiya;J. G. Liou

  • Influence of radiation damage on Late Jurassic zircon from southern China: Evidence from in situ measurements of oxygen isotopes, laser Raman, U-Pb ages, and trace elements

    Xiao-Lei Wang;Xiao-Lei Wang;Matthew A. Coble;John W. Valley;Xu-Jie Shu

  • In situ δ 18 O and Mg/Ca analyses of diagenetic and planktic foraminiferal calcite preserved in a deep-sea record of the Paleocene-Eocene thermal maximum

    Reinhard Kozdon;D. C. Kelly;K. Kitajima;A. Strickland

  • Evolution of the composition of seawater through geologic time, and its influence on the evolution of life

    Tsuyoshi Komiya;Takafumi Hirata;Kouki Kitajima;Shinji Yamamoto

  • Questioning the biogenicity of Neoproterozoic superheavy pyrite by SIMS

    Huan Cui;Kouki Kitajima;Michael J. Spicuzza;John H. Fournelle

  • Facies architecture and sequence-stratigraphic features of the Tumbiana Formation in the Pilbara Craton, northwestern Australia: Implications for depositional environments of oxygenic stromatolites during the Late Archean

    Ryusuke Sakurai;Makoto Ito;Yuichiro Ueno;Kouki Kitajima

  • Preservation and detection of microstructural and taxonomic correlations in the carbon isotopic compositions of individual Precambrian microfossils

    Kenneth H. Williford;Takayuki Ushikubo;J. William Schopf;J. William Schopf;Kevin Lepot

  • Metamorphic P–T–time history of the Sanbagawa belt in central Shikoku, Japan and implications for retrograde metamorphism during exhumation

    Kazumasa Aoki;Kouki Kitajima;Hideki Masago;Manabu Nishizawa

  • Secondary Ion Mass Spectrometry Bias on Isotope Ratios in Dolomite–Ankerite, Part II: δ13C Matrix Effects

    Maciej G. Śliwiński;Kouki Kitajima;Reinhard Kozdon;Reinhard Kozdon;Michael J. Spicuzza

  • Carbon and sulfur isotopic signatures of ancient life and environment at the microbial scale: Neoarchean shales and carbonates

    K. H. Williford;K. H. Williford;T. Ushikubo;K. Lepot;K. Kitajima

  • Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2

    Unknown

  • Melt origin across a rifted continental margin: A case for subduction-related metasomatic agents in the lithospheric source of alkaline basalt, NW Ross Sea, Antarctica

    Kurt S. Panter;Paterno Castillo;Susan Krans;Chad Deering

  • Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis

    Unknown

  • Grain-scale iron isotopic distribution of pyrite from Precambrian shallow marine carbonate revealed by a femtosecond laser ablation multicollector ICP-MS technique: Possible proxy for the redox state of ancient seawater

    Manabu Nishizawa;Manabu Nishizawa;Hiroki Yamamoto;Yuichiro Ueno;Subaru Tsuruoka

  • Fluid generation and evolution during exhumation of deeply subducted UHP continental crust: Petrogenesis of composite granite–quartz veins in the Sulu belt, China

    S.-J. Wang;S.-J. Wang;L. Wang;M. Brown;M. Brown;P. M. Piccoli

  • Diversity in early crustal evolution: 4100 Ma zircons in the Cathaysia Block of southern China

    Guang-Fu Xing;Xiao-Lei Wang;Yusheng Wan;Zhi-Hong Chen

  • Middle Archean ocean ridge hydrothermal metamorphism and alteration recorded in the Cleaverville area, Pilbara Craton, Western Australia

    T. Shibuya;K. Kitajima;T. Komiya;M. Terabayashi

  • Microstructure-specific carbon isotopic signatures of organic matter from ∼3.5 Ga cherts of the Pilbara Craton support a biologic origin

    Navot Morag;Kenneth H. Williford;Kenneth H. Williford;Kouki Kitajima;Pascal Philippot

  • Depth variation of carbon and oxygen isotopes of calcites in Archean altered upperoceanic crust: Implications for the CO2 flux from ocean to oceanic crust in the Archean

    Takazo Shibuya;Miyuki Tahata;Kouki Kitajima;Yuichiro Ueno

Frequent Co-Authors

John W. Valley
John W. Valley University of Wisconsin–Madison
Shigenori Maruyama
Shigenori Maruyama Tokyo Institute of Technology
Michael J. Spicuzza
Michael J. Spicuzza University of Wisconsin–Madison
Kenneth H. Williford
Kenneth H. Williford Blue Marble Space Institute of Science
Tsuyoshi Komiya
Tsuyoshi Komiya University of Tokyo
Takayuki Ushikubo
Takayuki Ushikubo Japan Agency for Marine-Earth Science and Technology
Reinhard Kozdon
Reinhard Kozdon Columbia University
Takafumi Hirata
Takafumi Hirata University of Tokyo
Jaime D. Barnes
Jaime D. Barnes The University of Texas at Austin
Yuichiro Ueno
Yuichiro Ueno Tokyo Institute of Technology

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