The DOI matches its Crossref record.
The Oceans; A Possible Source of Iron in Iron-Formations
Abstract
Recent work on one of the major banded iron-formations of the world--that of the Hamersley Basin of Australia--has defined the total amount of iron and the probable time interval of accumulation of the large iron ore deposits in the basin. The inferred rate of influx of iron into the basin is so large that a derivation of the iron from weathering and transport into the basin by rivers is unlikely. For the same reason derivation of the iron from volcanic sources is also unlikely. Derivation of the iron from the ocean floor is quantitatively possible if deep ocean water containing a few mg/1 of dissolved iron welled up, was oxidized in near surface environments, and deposited its iron in the basin. Iron concentrations of a few mg/1 in deep ocean water are quite reasonable if these water masses were saturated with respect to siderite and calcite.
Overview
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In the citing paper
“Traditionally, iron oxides in IF are interpreted to have formed from an initial Fe(III)-oxyhydroxide phase, e.g., ferrihydrite, Fe(OH)3, which precipitated in the photic zone from seawater via the oxidation of dissolved ferrous iron, Fe(II), at concentrations that may have ranged from 0.03 to 0.5 mM; Holland, 1973; Morris, 1993).”
From Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history (2017) · cites this paper as Holland, 1973
In the citing paper
“Holland (1973) had previously suggested that the iron was instead sourced from deep-marine, hydrothermally influenced waters and supplied to the depositional settings via upwelling processes.”
From Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history (2017) · cites this paper as Holland, 1973
Citations
Cites
Still being checked.
Cited by
Sorted by citations
Kasting, J. F. (1993) · Science · doi:10.1126/science.11536547 · Cited by 1,374
Proterozoic Ocean Chemistry and Evolution: A Bioinorganic Bridge?
Anbar, A. D., & Knoll, A. H. (2002) · Science · doi:10.1126/science.1069651 · Cited by 1,191
Bekker, A., Slack, J. F., Planavsky, N., Krapez, B., Hofmann, A., Konhauser, K. O., & Rouxel, O. J. (2010) · Economic Geology · doi:10.2113/gsecongeo.105.3.467 · Cited by 1,013
Klein, C. (2005) · American Mineralogist · doi:10.2138/am.2005.1871 · Cited by 969
Hazen, R. M., Papineau, D., Bleeker, W., Downs, R. T., Ferry, J. M., McCoy, T. J., Sverjensky, D. A., & Yang, H. (2008) · American Mineralogist · doi:10.2138/am.2008.2955 · Cited by 701
Kopp, R. E., Kirschvink, J. L., Hilburn, I. A., & Nash, C. Z. (2005) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0504878102 · Cited by 565
Theoretical constraints on oxygen and carbon dioxide concentrations in the Precambrian atmosphere
Kasting, J. F. (1987) · Precambrian Research · doi:10.1016/0301-9268(87)90001-5 · Cited by 530
Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history
Konhauser, K. O., Planavsky, N. J., Hardisty, D. S., Robbins, L. J., Warchola, T. J., Haugaard, R., Lalonde, S. V., Partin, C. A., Oonk, P. B. H., Tsikos, H., et al. (2017) · Earth-Science Reviews · doi:10.1016/j.earscirev.2017.06.012 · Cited by 537
Planavsky, N. J., Bekker, A., Rouxel, O. J., Kamber, B. S., Hofmann, A., Knudsen, A. C., & Lyons, T. W. (2010) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2010.07.021 · Cited by 522
Deposition of banded iron formations by anoxygenic phototrophic Fe(II)-oxidizing bacteria
Kappler, A., Pasquero, C., Konhauser, K. O., & Newman, D. K. (2005) · Geology · doi:10.1130/g21658.1 · Cited by 501
Anaerobic oxidation of ferrous iron by purple bacteria, a new type of phototrophic metabolism
Ehrenreich, A., & Widdel, F. (1994) · Applied and Environmental Microbiology · doi:10.1128/aem.60.12.4517-4526.1994 · Cited by 504
The chemical evolution of Precambrian seawater: evidence from REEs in banded iron formations
Derry, L. A., & Jacobsen, S. B. (1990) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(90)90114-z · Cited by 468
Plume‐related mafic volcanism and the deposition of banded iron formation
Isley, A. E., & Abbott, D. (1999) · Journal of Geophysical Research Atmospheres · doi:10.1029/1999jb900066 · Cited by 455
The evolution of the sulfur cycle
Canfield, D. E. (1999) · American Journal of Science · doi:10.2475/ajs.299.7-9.697 · Cited by 378
Croal, L. R., Johnson, C. M., Beard, B. L., & Newman, D. K. (2004) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2003.09.011 · Cited by 362
Formation and occurrence of biogenic iron-rich minerals
Fortin, D., & Langley, S. (2005) · Earth-Science Reviews · doi:10.1016/j.earscirev.2005.03.002 · Cited by 359
Kaufman, A. J., Hayes, J. M., Knoll, A. H., & Germs, G. (1991) · Precambrian Research · doi:10.1016/0301-9268(91)90039-d · Cited by 354
Barite, BIFs and bugs: evidence for the evolution of the Earth’s early hydrosphere
Huston, D. L., & Logan, G. A. (2004) · Earth and Planetary Science Letters · doi:10.1016/s0012-821x(04)00034-2 · Cited by 318
Photo-oxidation of hydrated Fe2+—significance for banded iron formations
Braterman, P. S., Cairns-Smith, A. G., & Sloper, R. W. (1983) · Nature · doi:10.1038/303163a0 · Cited by 306
Morris, R. C. (1993) · Precambrian Research · doi:10.1016/0301-9268(93)90051-3 · Cited by 306
Toxic Metals in the Environment: The Role of Surfaces
Sparks, D. L. (2005) · Elements · doi:10.2113/gselements.1.4.193 · Cited by 315
Silica diagenesis: origin of inorganic and replacement cherts
Hesse, R. (1989) · Earth-Science Reviews · doi:10.1016/0012-8252(89)90024-x · Cited by 302
Decoupling photochemical Fe(II) oxidation from shallow-water BIF deposition
Konhauser, K. O., Amskold, L., Lalonde, S. V., Posth, N. R., Kappler, A. A., & Anbar, A. D. (2007) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2007.03.026 · Cited by 303
Iron Formations: Their Origins and Implications for Ancient Seawater Chemistry
Bekker, A., Planavsky, N. J., Krapež, B., Rasmussen, B., Hofmann, A., Slack, J. F., Rouxel, O. J., & Konhauser, K. O. (2013) · Elsevier eBooks · doi:10.1016/b978-0-08-095975-7.00719-1 · Cited by 292
Hydrothermal plumes and the delivery of iron to banded iron formation
Isley, A. E. (1995) · The Journal of Geology · doi:10.1086/629734 · Cited by 261
Tosca, N. J., Guggenheim, S., & Pufahl, P. K. (2016) · Geological Society of America Bulletin · doi:10.1130/b31339.1 · Cited by 241
Prebiotic ammonia from reduction of nitrite by iron (II) on the early Earth
Summers, D. P., & Chang, S. (1993) · Nature · doi:10.1038/365630a0 · Cited by 241
Effects of high CO2 levels on surface temperature and atmospheric oxidation state of the early Earth
Kasting, J. F., Pollack, J. B., & Crisp, D. (1984) · Journal of Atmospheric Chemistry · doi:10.1007/bf00053803 · Cited by 231
The pio Operon Is Essential for Phototrophic Fe(II) Oxidation in Rhodopseudomonas palustris TIE-1
Jiao, Y., & Newman, D. K. (2006) · Journal of Bacteriology · doi:10.1128/jb.00776-06 · Cited by 230
Geological constraints on the origin of oxygenic photosynthesis
Farquhar, J., Zerkle, A. L., & Bekker, A. (2011) · Photosynthesis Research · doi:10.1007/s11120-010-9594-0 · Cited by 223
Biogeochemical signatures through time as inferred from whole microbial genomes
Zerkle, A. L. (2005) · American Journal of Science · doi:10.2475/ajs.305.6-8.467 · Cited by 223
Krapež, B., Barley, M. E., & Pickard, A. L. (2003) · Sedimentology · doi:10.1046/j.1365-3091.2003.00594.x · Cited by 216
ABIOTIC O2LEVELS ON PLANETS AROUND F, G, K, AND M STARS: POSSIBLE FALSE POSITIVES FOR LIFE?
Harman, C. E., Schwieterman, E. W., Schottelkotte, J. C., & Kasting, J. F. (2015) · The Astrophysical Journal · doi:10.1088/0004-637x/812/2/137 · Cited by 210
Huston, D. L., Pehrsson, S. J., Eglington, B. M., & Zaw, K. (2010) · Economic Geology · doi:10.2113/gsecongeo.105.3.571 · Cited by 198
An iron shuttle for deepwater silica in Late Archean and early Paleoproterozoic iron formation
Fischer, W. W., & Knoll, A. H. (2006) · Geological Society of America Bulletin · doi:10.1130/b26328.1 · Cited by 196
Suboxic diagenesis in banded iron formations
Walker, J. C. G. (1984) · Nature · doi:10.1038/309340a0 · Cited by 192
Inhibition of carbonate synthesis in acidic oceans on early Mars
Fairén, A. G., Fernández‐Remolar, D. C., Dohm, J. M., Baker, V. R., & Amils, R. (2004) · Nature · doi:10.1038/nature02911 · Cited by 192
Iron and sulfur in the pre-biologic ocean
Walker, J. C. G., & Brimblecombe, P. (1985) · Precambrian Research · doi:10.1016/0301-9268(85)90031-2 · Cited by 191
Solar Ultraviolet and the Evolutionary History of Cyanobacteria
García‐Pichel, F. (1998) · Origins of Life and Evolution of Biospheres · doi:10.1023/a:1006545303412 · Cited by 188
Cox, G. M., Halverson, G. P., Minarik, W. G., Heron, D. P. L., Macdonald, F. A., Bellefroid, E. J., & Strauss, J. V. (2013) · Chemical Geology · doi:10.1016/j.chemgeo.2013.08.002 · Cited by 187
The prebiotic geochemistry of formaldehyde
Cleaves II, H. J. (2008) · Precambrian Research · doi:10.1016/j.precamres.2008.04.002 · Cited by 179
Jacobsen, S. B., & Pimentel‐Klose, M. R. (1988) · Earth and Planetary Science Letters · doi:10.1016/0012-821x(88)90062-3 · Cited by 179
Coevolution of metal availability and nitrogen assimilation in cyanobacteria and algae
GLASS, J. B., WOLFE‐SIMON, F., & ANBAR, A. D. (2009) · Geobiology · doi:10.1111/j.1472-4669.2009.00190.x · Cited by 174
Frei, R., & Polat, A. (2006) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2006.10.033 · Cited by 175
Kasting, J. F., & Walker, J. C. G. (1981) · Journal of Geophysical Research Atmospheres · doi:10.1029/jc086ic02p01147 · Cited by 172
Alternating Si and Fe deposition caused by temperature fluctuations in Precambrian oceans
Posth, N. R., Hegler, F., Konhauser, K. O., & Kappler, A. (2008) · Nature Geoscience · doi:10.1038/ngeo306 · Cited by 167
Fairén, A. G. (2010) · Icarus · doi:10.1016/j.icarus.2010.01.006 · Cited by 169
Morris, R. C. (1985) · Elsevier eBooks · doi:10.1016/b978-0-444-42497-6.50006-0 · Cited by 161
Steinhoefel, G., Horn, I., & von Blanckenburg, F. (2009) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2009.05.037 · Cited by 155
Steinhoefel, G., von Blanckenburg, F., Horn, I., Konhauser, K. O., Beukes, N. J., & Gutzmer, J. (2010) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2010.01.028 · Cited by 159
Interplay between Oxygen and Fe–S Cluster Biogenesis: Insights from the Suf Pathway
Boyd, E. S., Thomas, K. M., Dai, Y., Boyd, J. M., & Outten, F. W. (2014) · Biochemistry · doi:10.1021/bi500488r · Cited by 153
Biogenic Fe(III) minerals: from formation to diagenesis and preservation in the rock record
Posth, N. R., Canfield, D. E., & Kappler, A. (2014) · Earth-Science Reviews · doi:10.1016/j.earscirev.2014.03.012 · Cited by 153
Metal limitation of cyanobacterial N2fixation and implications for the Precambrian nitrogen cycle
ZERKLE, A. L., HOUSE, C. H., COX, R. P., & CANFIELD, D. E. (2006) · Geobiology · doi:10.1111/j.1472-4669.2006.00082.x · Cited by 149
Coupled Fe and S isotope evidence for Archean microbial Fe(III) and sulfate reduction
Archer, C., & Vance, D. (2006) · Geology · doi:10.1130/g22067.1 · Cited by 148
Sugitani, K. (1996) · Precambrian Research · doi:10.1016/s0301-9268(96)00005-8 · Cited by 152
Morris, R. C., & Horwitz, R. C. (1983) · Precambrian Research · doi:10.1016/0301-9268(83)90044-x · Cited by 147
Ganno, S., Laure, N. T. E., Djibril, K. N. G., Soh, A. P. D., Moudioh, C., Ngnotué, T., & Paul, N. J. (2016) · Ore Geology Reviews · doi:10.1016/j.oregeorev.2016.08.021 · Cited by 146
Charlet, L., Silvester, E. J., & Liger, E. (1998) · Chemical Geology · doi:10.1016/s0009-2541(98)00072-2 · Cited by 143
Hargraves, R. B. (1976) · Science · doi:10.1126/science.193.4251.363 · Cited by 143
In vitro growth of iron sulphide chimneys: possible culture chambers for origin‐of‐life experiments
Russell, M. J., Hall, A. J., & Turner, D. (1989) · Terra Nova · doi:10.1111/j.1365-3121.1989.tb00364.x · Cited by 139
The onset of widespread marine red beds and the evolution of ferruginous oceans
Song, H., Jiang, G., Poulton, S. W., Wignall, P. B., Tong, J., Song, H., An, Z., Chu, D., Tian, L., She, Z., et al. (2017) · Nature Communications · doi:10.1038/s41467-017-00502-x · Cited by 125
Exhalative origins of iron formations
Kimberley, M. M. (1989) · Ore Geology Reviews · doi:10.1016/0169-1368(89)90003-6 · Cited by 126
Simulating Precambrian banded iron formation diagenesis
Posth, N. R., Köhler, I., Swanner, E. D., Schröder, C. A., Wellmann, E., Binder, B. R., Konhauser, K. O., Neumann, U., Berthold, C., Nowak, M., et al. (2013) · Chemical Geology · doi:10.1016/j.chemgeo.2013.05.031 · Cited by 126
Microbiological processes in banded iron formation deposition
Posth, N. R., Konhauser, K. O., & Kappler, A. A. (2013) · Sedimentology · doi:10.1111/sed.12051 · Cited by 124
Possible limits on the composition of the Archaean ocean
Walker, J. C. G. (1983) · Nature · doi:10.1038/302518a0 · Cited by 115
Long-term sedimentary recycling of rare sulphur isotope anomalies
Reinhard, C. T., Planavsky, N. J., & Lyons, T. W. (2013) · Nature · doi:10.1038/nature12021 · Cited by 113
Young, G. M. (2002) · Journal of African Earth Sciences · doi:10.1016/s0899-5362(02)00158-6 · Cited by 111
Rasmussen, B., Muhling, J. R., Suvorova, A., & Krapež, B. (2017) · Precambrian Research · doi:10.1016/j.precamres.2016.12.005 · Cited by 111
Manikyamba, C., Balaram, V., & Naqvi, S. M. (1993) · Precambrian Research · doi:10.1016/0301-9268(93)90061-6 · Cited by 108
Sugitani, K. (1992) · Precambrian Research · doi:10.1016/0301-9268(92)90093-4 · Cited by 108
Tectonic systems and the deposition of iron-formation
Gross, G. A. (1983) · Precambrian Research · doi:10.1016/0301-9268(83)90072-4 · Cited by 102
Precambrian continental freeboard and geological evolution: A time perspective
Eriksson, P. G., Mazumder, R., Catuneanu, O., Bumby, A. J., & Ilondo, B. O. (2006) · Earth-Science Reviews · doi:10.1016/j.earscirev.2006.07.001 · Cited by 102
Production of 15N‐depleted biomass during cyanobacterial N2‐fixation at high Fe concentrations
Zerkle, A. L., Junium, C. K., Canfield, D. E., & House, C. H. (2008) · Journal of Geophysical Research Atmospheres · doi:10.1029/2007jg000651 · Cited by 101
Evidence for episodic oxygenation in a weakly redox-buffered deep mid-Proterozoic ocean
Planavsky, N. J., Slack, J. F., Cannon, W. F., O’Connell, B., Isson, T. T., Asael, D., Jackson, J. C., Hardisty, D. S., Lyons, T. W., & Bekker, A. (2018) · Chemical Geology · doi:10.1016/j.chemgeo.2018.03.028 · Cited by 101
The biogeochemistry of ferruginous lakes and past ferruginous oceans
Swanner, E. D., Lambrecht, N., Wittkop, C. A., Harding, C., Katsev, S., Torgeson, J. M., & Poulton, S. W. (2020) · Earth-Science Reviews · doi:10.1016/j.earscirev.2020.103430 · Cited by 104
Magnetotactic bacteria and magnetofossils: ecology, evolution and environmental implications
Goswami, P., He, K., Li, J., Pan, Y., Roberts, A. P., & Lin, W. (2022) · npj Biofilms and Microbiomes · doi:10.1038/s41522-022-00304-0 · Cited by 95
Hu, J., Wang, H., Huang, C., Tong, L., 慕生禄, & Qiu, Z.-W. (2015) · Journal of Asian Earth Sciences · doi:10.1016/j.jseaes.2015.08.014 · Cited by 92
Early Precambrian oxygen: a case against photosynthesis
Towe, K. M. (1978) · Nature · doi:10.1038/274657a0 · Cited by 92
Konhauser, K. O., & Riding, R. (2012) · Wiley eBooks · doi:10.1002/9781118280874.ch8 · Cited by 93
The Archean nickel famine revisited
Konhauser, K. O., Robbins, L. J., Pecoits, E., Peacock, C., Kappler, A., & Lalonde, S. V. (2015) · Astrobiology · doi:10.1089/ast.2015.1301 · Cited by 88
Primary Productivity Was Limited by Electron Donors Prior to the Advent of Oxygenic Photosynthesis
Ward, L. M., Rasmussen, B., & Fischer, W. W. (2018) · Journal of Geophysical Research Biogeosciences · doi:10.1029/2018jg004679 · Cited by 95
Neoproterozoic tectonic and climatic evolution recorded in the Gariep Belt, Namibia and South Africa
Frimmel, H. E., Fölling, P. G., & Eriksson, P. G. (2002) · Basin Research · doi:10.1046/j.1365-2117.2002.00166.x · Cited by 91
Vigneresse, J. (2005) · Precambrian Research · doi:10.1016/j.precamres.2005.01.001 · Cited by 89
Biostratigraphic usefulness of stromatolitic precambrian microbiotas: A preliminary analysis
Schopf, J. W. (1977) · Precambrian Research · doi:10.1016/0301-9268(77)90026-2 · Cited by 90
Primary hematite in Neoarchean to Paleoproterozoic oceans
Sun, S., Konhauser, K. O., Kappler, A. A., & Li, Y. (2015) · Geological Society of America Bulletin · doi:10.1130/b31122.1 · Cited by 86
Chemical and biological evolution of early Earth: Constraints from banded iron formations
Ohmoto, H., Watanabe, Y., Yamaguchi, K. E., Naraoka, H., Haruna, M., Kakegawa, T., Hayashi, K., & Kato, Y. (2006) · Geological Society of America eBooks · doi:10.1130/2006.1198(17 · Cited by 86
Martinsson, O., Billström, K., Broman, C., Weihed, P., & Wanhainen, C. (2016) · Ore Geology Reviews · doi:10.1016/j.oregeorev.2016.02.011 · Cited by 85
Posth, N. R., Huelin, S., Konhauser, K. O., & Kappler, A. A. (2010) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2010.02.036 · Cited by 82
Phototrophic Fe(II)-oxidation in the chemocline of a ferruginous meromictic lake
Walter, X. A., Picazo, A., Miracle, M. R., Vicente, E., Camacho, A., Aragno, M., & Zopfi, J. (2014) · Frontiers in Microbiology · doi:10.3389/fmicb.2014.00713 · Cited by 83
Webb, A. D., Dickens, G. R., & Oliver, N. H. S. (2003) · Chemical Geology · doi:10.1016/s0009-2541(02)00352-2 · Cited by 81
Veizer, J. (1978) · Precambrian Research · doi:10.1016/0301-9268(78)90024-4 · Cited by 81
Extensive deposition of banded iron formations was possible without photosynthesis
François, L. (1986) · Nature · doi:10.1038/320352a0 · Cited by 81
Greenalite and its role in the genesis of early Precambrian iron formations – A review
Rasmussen, B., Muhling, J. R., & Krapež, B. (2021) · Earth-Science Reviews · doi:10.1016/j.earscirev.2021.103613 · Cited by 83
Chung, D., Zhou, M., Gao, J., & Chen, W. T. (2014) · Ore Geology Reviews · doi:10.1016/j.oregeorev.2014.09.030 · Cited by 79
A Zn isotope perspective on the rise of continents
Pons, M. ‐., Fujii, T., Rosing, M., Quitté, G., Télouk, P., & Albarède, F. (2013) · Geobiology · doi:10.1111/gbi.12030 · Cited by 78
Steep Rock Lake: Sedimentology and geochemistry of an Archean carbonate platform
Fralick, P. W., & Riding, R. (2015) · Earth-Science Reviews · doi:10.1016/j.earscirev.2015.10.006 · Cited by 79
Kendall, B., Anbar, A. D., Kappler, A. A., & Konhauser, K. O. (2012) · Wiley eBooks · doi:10.1002/9781118280874.ch6 · Cited by 80
Patterns of sedimentation in the Precambrian
Eriksson, P. G., Catuneanu, O., Sarkar, S., & Tirsgaard, H. (2005) · Sedimentary Geology · doi:10.1016/j.sedgeo.2005.01.003 · Cited by 77
Winter, B. L., & Knauth, L. P. (1992) · Precambrian Research · doi:10.1016/0301-9268(92)90061-r · Cited by 79
Metadata
- Authors
- Holland, H. D.
- Corresponding author
- Holland, Heinrich D.
- Venue
- Economic Geology
- Publisher
- Society of Economic Geologists, Inc.
- Published
- 1973-11-01
- Volume
- 68
- Issue
- 7
- Pages
- 1169-1172
- ISSN
- 0361-0128 (ISSN-L)
- 1554-0774
- OpenAlex
- W2132760947
- Cited by
- 365
- References
- 0
- Citations by year
- 2026: 8 · 2025: 7 · 2024: 19 · 2023: 20 · 2022: 11 · 2021: 14 · 2020: 6 · 2019: 10 · 2018: 9 · 2017: 15 · 2016: 11 · 2015: 24 · 2014: 13 · 2013: 13 · 2012: 10
- FWCI
- 6.85
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Economic Geology (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Geological formations and processes
- Keywords
- banded iron formations, Hamersley Basin, iron sources, deep-sea water, dissolved iron, iron oxidation, siderite, calcite saturation, iron ore deposits, Precambrian
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review