Contrasting molybdenum cycling and isotopic properties in euxinic versus non-euxinic sediments and sedimentary rocks: refining the paleoproxies

Scott, Clint; Lyons, Timothy W.

doi:10.1016/j.chemgeo.2012.05.012

Cited by 745Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisGeological and Geochemical Analysis

Contrasting molybdenum cycling and isotopic properties in euxinic versus non-euxinic sediments and sedimentary rocks: refining the paleoproxies

Scott, Clint, Lyons, Timothy W.·2012·Chemical Geology

DOI 10.1016/j.chemgeo.2012.05.012

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Black shales rich in organic matter and deposited beneath anoxic, sulfidic pore waters can accumulate redox-sensitive metals, particularly Mo.
“By contrast, organic-rich black shales deposited under anoxic and sulfidic pore waters may become enriched in redox-sensitive trace metals, especially Mo (Algeo and Lyons, 2006;März et al., 2008;Scott and Lyons, 2012).”
From Trace elements at the intersection of marine biological and geochemical evolution (2016) · cites this paper as Scott and Lyons, 2012

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The oceanic mass balance of copper and zinc isotopes, investigated by analysis of their inputs, and outputs to ferromanganese oxide sediments
Little, S., Vance, D., Walker-Brown, C., & Landing, W. M. (2013) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2013.07.046 · Cited by 357 · see citing works
“With regard to the latter potential application, most progress has been made with molybdenum isotopes, where the speciation in oxic versus euxinic (free H2S-bearing) aqueous solutions is fundamentally different, where the rate of output is controlled by this speciation, and where speciation-related isotopic fractionat…”
Background
THE STABLE ISOTOPE GEOCHEMISTRY OF MOLYBDENUM
Kendall, B., Dahl, T. W., & Anbar, A. D. (2017) · Reviews in Mineralogy and Geochemistry · doi:10.2138/rmg.2017.82.16 · Cited by 333 · see citing works
“…dissolved in river waters and leaving primarily in association with authigenic Fe–Mn oxides and anoxic sediments underlying oxic or anoxic waters, where hydrogen sulfide is present (Crusius et al. 1996; Morford and Emerson 1999; Scott et al. 2008; Scott and Lyons 2012; Reinhard et al. 2013a).”
BackgroundResultInfluential
The iron paleoredox proxies: A guide to the pitfalls, problems and proper practice
Raiswell, R., Hardisty, D. S., Lyons, T. W., Canfield, D. E., Owens, J. D., Planavsky, N. J., Poulton, S. W., & Reinhard, C. T. (2018) · American Journal of Science · doi:10.2475/05.2018.03 · Cited by 303 · see citing works
“Concentrations between 25 and 100 ppm are characteristic of oscillatory or seasonal euxinia or restricted systems with persistent euxinia that draw down the Mo reservoir (Scott and Lyons, 2012).”
BackgroundSelf-citation
Uranium and molybdenum isotope evidence for an episode of widespread ocean oxygenation during the late Ediacaran Period
Kendall, B., Komiya, T., Lyons, T. W., Bates, S. M., Gordon, G. W., Romaniello, S. J., Jiang, G., Creaser, R. A., Xiao, S., McFadden, K., et al. (2015) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2015.02.025 · Cited by 286 · see citing works
Self-citation
A highly redox-heterogeneous ocean in South China during the early Cambrian (∼529–514 Ma): Implications for biota-environment co-evolution
Jin, C., Li, C., Algeo, T. J., Planavsky, N. J., Cui, H., Yang, X., Zhao, Y., Zhang, X., & Xie, S. (2016) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2016.02.019 · Cited by 263 · see citing works
Controls on trace metal authigenic enrichment in reducing sediments: Insights from modern oxygen-deficient settings
Little, S., Vance, D., Lyons, T. W., & McManus, J. F. (2015) · American Journal of Science · doi:10.2475/02.2015.01 · Cited by 245 · see citing works
“Nevertheless, high Mo enrichments in the Peru Margin sediments challenges the notion that euxinia is required for large Mo enrichment (for example Scott and Lyons, 2012).”
BackgroundSelf-citation
The behavior of trace elements in seawater, sedimentary pore water, and their incorporation into carbonate minerals: a review
Smrzka, D., Zwicker, J., Bach, W., Feng, D., Himmler, T., Chen, D., & Peckmann, J. (2019) · Facies · doi:10.1007/s10347-019-0581-4 · Cited by 251 · see citing works
“1997; Algeo and Rowe 2012; Scott and Lyons 2012).”
Background
Ocean euxinia and climate change “double whammy” drove the Late Ordovician mass extinction
Zou, C., Qiu, Z., Poulton, S. W., Dong, D., Wang, H., Chen, D., Lu, B., Shi, Z., & Tao, H. (2018) · Geology · doi:10.1130/g40121.1 · Cited by 239 · see citing works
“…generally above 25 ppm but less than 81 100 ppm, likely reflecting the development of at least intermittent euxinia below the 82 LOMEI-1 interval (Scott and Lyons, 2012), although such a signal might also develop 83 under weakly euxinic conditions if sulfide concentrations fluctuated around the…”
Background
Depositional environment and organic matter accumulation of Upper Ordovician–Lower Silurian marine shale in the Upper Yangtze Platform, South China
Li, Y., Zhang, T., Ellis, G. S., & Shao, D. (2016) · Palaeogeography Palaeoclimatology Palaeoecology · doi:10.1016/j.palaeo.2016.11.037 · Cited by 237 · see citing works
Trace elements at the intersection of marine biological and geochemical evolution
Robbins, L. J., Lalonde, S. V., Planavsky, N. J., Partin, C. A., Reinhard, C. T., Kendall, B., Scott, C., Hardisty, D. S., Gill, B. C., Alessi, D. S., et al. (2016) · Earth-Science Reviews · doi:10.1016/j.earscirev.2016.10.013 · Cited by 227 · see citing works
“In at least one case, careful examination of the rock record reveals that biological innovation, rather than evolving marine trace element concentrations, may have guided biological dependency (Zn, c.f. section 3.4; Scott et al., 2012; Robbins et al., 2013).”
BackgroundInfluentialSelf-citation
A sulfate control on marine mid-depth euxinia on the early Cambrian (ca. 529–521Ma) Yangtze platform, South China
Feng, L., Li, C., Huang, J., Chang, H., & Chu, X. (2014) · Precambrian Research · doi:10.1016/j.precamres.2014.03.002 · Cited by 193 · see citing works
Does pyrite act as an important host for molybdenum in modern and ancient euxinic sediments?
Chappaz, A., Lyons, T. W., Gregory, D. D., Reinhard, C. T., Gill, B. C., Li, C., & Large, R. R. (2013) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2013.10.028 · Cited by 182 · see citing works
Self-citation
Coupled molybdenum, iron, and uranium stable isotopes as oceanic paleoredox proxies during the Paleoproterozoic Shunga Event
Asael, D., Tissot, F. L. H., Reinhard, C. T., Rouxel, O., Dauphas, N., Lyons, T. W., Ponzevera, E., Liorzou, C., & Chéron, S. (2013) · Chemical Geology · doi:10.1016/j.chemgeo.2013.08.003 · Cited by 168 · see citing works
“Scott and Lyons (2012) showed that Mo/TOC ratios may provide direct evidence for euxinic conditions, except under extreme conditions of Mo limitation.”
Background
Paleo-environmental cyclicity in the Early Silurian Yangtze Sea (South China): Tectonic or glacio-eustatic control?
Liu, Z., Algeo, T. J., Guo, X., Fan, J., Du, X., & Lu, Y. (2016) · Palaeogeography Palaeoclimatology Palaeoecology · doi:10.1016/j.palaeo.2016.11.007 · Cited by 149 · see citing works
Redox heterogeneity of subsurface waters in the <scp>M</scp>esoproterozoic ocean
Sperling, E. A., Rooney, A. D., Hays, L., Sergeev, V. N., Vorob'eva, N. G., Sergeeva, N. D., Selby, D., Johnston, D. T., & Knoll, A. H. (2014) · Geobiology · doi:10.1111/gbi.12091 · Cited by 149 · see citing works
“Further, due to widespread reducing sinks, trace metal enrichments in anoxic sediments in the Proterozoic are generally muted (Reinhard et al., 2013), potentially limiting their usefulness as local water-column redox proxies during this time (Scott and Lyons, 2012).”
Background
Intense molybdenum accumulation in sediments underneath a nitrogenous water column and implications for the reconstruction of paleo-redox conditions based on molybdenum isotopes
Scholz, F., Siebert, C., Dale, A. W., & Frank, M. (2017) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2017.06.048 · Cited by 149 · see citing works
A new estimate of detrital redox-sensitive metal concentrations and variability in fluxes to marine sediments
Cole, D. B., Zhang, S., & Planavsky, N. J. (2017) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2017.08.004 · Cited by 146 · see citing works
Molybdenum isotope systematics in subduction zones
König, S., Wille, M., Voegelin, A. R., & Schoenberg, R. (2016) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2016.04.033 · Cited by 142 · see citing works
Molybdenum reduction in a sulfidic lake: Evidence from X-ray absorption fine-structure spectroscopy and implications for the Mo paleoproxy
Dahl, T. W., Chappaz, A., Fitts, J. P., & Lyons, T. W. (2012) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2012.10.058 · Cited by 144 · see citing works
“Modern intermittently euxinic/anoxic sediments off the coast of Namibia and Peru (Weeks et al., 2004; Lavik et al., 2009) display strong Mo enrichments ( 60 ppm; Brongersma-Sanders et al., 1980; Böning et al., 2004), but generally lower than in permanently euxinic sediments (Scott and Lyons, 2012).”
BackgroundInfluentialSelf-citation
New insights into cerium anomalies and mechanisms of trace metal enrichment in authigenic carbonate from hydrocarbon seeps
Hu, Y., Feng, D., Peckmann, J., Roberts, H. H., & Chen, D. (2014) · Chemical Geology · doi:10.1016/j.chemgeo.2014.05.014 · Cited by 144 · see citing works
“Conversely, in euxinic environmentswhere hydrogen sulfide is present in the water column, Mo concentrations exceed 60 ppm and can reach 100 s ppm in the sediments below euxinicwater columns (Scott and Lyons, 2012).”
BackgroundInfluential
Progressive environmental deterioration in northwestern Pangea leading to the latest Permian extinction
Grasby, S. E., Beauchamp, B., Bond, D. P. G., Wignall, P. B., Talavera, C., Galloway, J. M., Piepjohn, K., Reinhardt, L., & Blomeier, D. (2015) · Geological Society of America Bulletin · doi:10.1130/b31197.1 · Cited by 139 · see citing works
Identifying oxygen minimum zone-type biogeochemical cycling in Earth history using inorganic geochemical proxies
Scholz, F. (2018) · Earth-Science Reviews · doi:10.1016/j.earscirev.2018.08.002 · Cited by 136 · see citing works
“Sedimentary Mo concentrations above 25 μg g have been suggested to be generally indicative for euxinic conditions (Scott and Lyons, 2012; Dahl et al., 2013).”
Background
The isotopic composition of authigenic chromium in anoxic marine sediments: a case study from the Cariaco Basin
Reinhard, C. T., Planavsky, N. J., Wang, X., Fischer, W. W., Johnson, T. M., & Lyons, T. W. (2014) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2014.09.024 · Cited by 134 · see citing works
“2a by Mo) are elevated well above those typical of oxic sediments or organic-rich sulfidic sediments deposited beneath oxic or suboxic bottom waters (Scott and Lyons, 2012).”
BackgroundSelf-citation
The hyper-enrichment of V and Zn in black shales of the Late Devonian-Early Mississippian Bakken Formation (USA)
Scott, C., Slack, J. F., & Kelley, K. D. (2017) · Chemical Geology · doi:10.1016/j.chemgeo.2017.01.026 · Cited by 133 · see citing works
Self-citation
Preservation of organic matter in shale linked to bacterial sulfate reduction (BSR) and volcanic activity under marine and lacustrine depositional environments
Liu, Q., Li, P., Jin, Z., Liang, X., Zhu, D., Wu, X., Meng, Q., Liu, J., Fu, Q., & Zhao, J. (2021) · Marine and Petroleum Geology · doi:10.1016/j.marpetgeo.2021.104950 · Cited by 130 · see citing works
Cobalt and marine redox evolution
Swanner, E. D., Planavsky, N. J., Lalonde, S. V., Robbins, L. J., Bekker, A., Rouxel, O. J., Saito, M. A., Kappler, A., Mojzsis, S. J., & Konhauser, K. O. (2014) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2014.01.001 · Cited by 127 · see citing works
“389 390 4.3 Bulk euxinic shales as a Co archive 391 Cobalt is enriched in sediments deposited under euxinic conditions (Algeo and 392 Maynard, 2004), and the shales used in this study have Mo contents >25 ppm, 393 consistent with euxinia (Scott and Lyons, 2012).”
MethodInfluential
Reconstruction of early Cambrian ocean chemistry from Mo isotopes
Wen, H., Fan, H., Zhang, Y., Cloquet, C., & Carignan, J. (2015) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2015.05.008 · Cited by 131 · see citing works
Volcanic and hydrothermal activities recorded in phosphate nodules from the Lower Cambrian Niutitang Formation black shales in South China
Gao, P., He, Z.-L., Li, S., Lash, G., Li, B.-Y., Huang, B., & Yan, D. (2018) · Palaeogeography, Palaeoclimatology, Palaeoecology · doi:10.1016/j.palaeo.2018.06.019 · Cited by 114 · see citing works
Basin redox and primary productivity within the Mesoproterozoic Roper Seaway
Cox, G. M., Jarrett, A. J. M., Edwards, D. S., Crockford, P. W., Halverson, G. P., Collins, A. S., Poirier, A., & Li, Z. (2016) · Chemical Geology · doi:10.1016/j.chemgeo.2016.06.025 · Cited by 123 · see citing works
“Themechanistic underpinnings for this relationship have been described by Algeo andMaynard (2004) and Scott and Lyons (2012), where strong linear relationships between TE enrichments and TOC persist under sub-oxic and anoxic conditions where the principal sink for these TEs is organo-metallic…”
BackgroundResultInfluential
Evidence of intense methane seepages from molybdenum enrichments in gas hydrate-bearing sediments of the northern South China Sea
Chen, F., Hu, Y., Feng, D., Zhang, X., Cheng, S., Cao, J., Lu, H., & Chen, D. (2016) · Chemical Geology · doi:10.1016/j.chemgeo.2016.09.029 · Cited by 119 · see citing works
Evidence of molybdenum association with particulate organic matter under sulfidic conditions
Dahl, T. W., Chappaz, A., Hoek, J., McKenzie, C. J., Svane, S., & Canfield, D. E. (2016) · Geobiology · doi:10.1111/gbi.12220 · Cited by 113 · see citing works
“…beneath anoxic and sulfidic (euxinic) waters are typically enriched in Mo by up to two orders of magnitude relative to upper crustal material (1–2 μg/g) (Taylor & Mclennan, 1995) and organic- rich sediments deposited beneath oxic waters (~5 μg/g) (Dahl, Ruhl et al., 2013; Scott & Lyons, 2012).”
Bioactive Trace Metals and Their Isotopes as Paleoproductivity Proxies: An Assessment Using GEOTRACES‐Era Data
Horner, T. J., Little, S., Conway, T. M., Farmer, J. R., Hertzberg, J. E., Lough, A., McKay, J. L., Tessin, A. C., Galer, S. J. G., Jaccard, S. L., et al. (2021) · Global Biogeochemical Cycles · doi:10.1029/2020gb006814 · Cited by 117 · see citing works
Marine Mo biogeochemistry in the context of dynamically euxinic mid-depth waters: A case study of the lower Cambrian Niutitang shales, South China
Cheng, M., Li, C., Zhou, L., Algeo, T. J., Zhang, F., Romaniello, S. J., Jin, C., Lei, L., Feng, L., & Jiang, S. (2016) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2016.03.035 · Cited by 116 · see citing works
Controls on the evolution of Ediacaran metazoan ecosystems: A redox perspective
Bowyer, F., Wood, R. A., & Poulton, S. W. (2017) · Geobiology · doi:10.1111/gbi.12232 · Cited by 112 · see citing works
“…number of studies have explored the potential for the ratio of molybdenum to total organic carbon, and changes in RSE concentration and size of the local seawater sulphate reservoir as geochemical proxies for basin restriction in anoxic sulphidic settings (Algeo & Lyons, 2006; Scott & Lyons, 2012).”
Background
Empirical links between trace metal cycling and marine microbial ecology during a large perturbation to Earth's carbon cycle
Owens, J. D., Reinhard, C. T., Rohrssen, M., Love, G. D., & Lyons, T. W. (2016) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2016.05.046 · Cited by 108 · see citing works
Self-citation
A nutrient control on marine anoxia during the end-Permian mass extinction
Schobben, M., Foster, W. J., Sleveland, A. R. N., Zuchuat, V., Svensen, H. H., Planke, S., Bond, D. P. G., Marcelis, F. H. M., Newton, R. J., Wignall, P. B., et al. (2020) · Nature Geoscience · doi:10.1038/s41561-020-0622-1 · Cited by 112 · see citing works
Rapid Sediment Accumulation Results in High Methane Effluxes from Coastal Sediments
Egger, M., Lenstra, W. K., Jong, D., Meysman, F. J. R., Sapart, C., van der Veen, C., Röckmann, T., González, S., & Slomp, C. P. (2016) · PLoS ONE · doi:10.1371/journal.pone.0161609 · Cited by 110 · see citing works
The Molybdenum Isotope System as a Tracer of Slab Input in Subduction Zones: An Example From Martinique, Lesser Antilles Arc
Gaschnig, R. M., Reinhard, C. T., Planavsky, N. J., Wang, X., Asael, D., & Chauvel, C. (2017) · Geochemistry Geophysics Geosystems · doi:10.1002/2017gc007085 · Cited by 111 · see citing works
“Given that the Mo isotope composition of sediments will vary with redox conditions (e.g., Scott & Lyons, 2012), this could provide a new means to track deep marine redox evolution.”
Background
Basin-scale controls on the molybdenum-isotope composition of seawater during Oceanic Anoxic Event 2 (Late Cretaceous)
Dickson, A. J., Jenkyns, H. C., Porcelli, D., van den Boorn, S. H. J. M., & Idiz, E. (2016) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2015.12.036 · Cited by 100 · see citing works
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 100 · see citing works
Self-citation
A Mesoproterozoic iron formation
Canfield, D. E., Zhang, S., Wang, H., Wang, X., Zhao, W., Su, J., Bjerrum, C. J., Haxen, E. R., & Hammarlund, E. U. (2018) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1720529115 · Cited by 99 · see citing works
“5), as might be expected in a low-sulfide environment (66, 67).”
Background
Redox variations and organic matter accumulation on the Yangtze carbonate platform during Late Ediacaran–Early Cambrian: Constraints from petrology and geochemistry
Gao, P., Liu, G., Jia, C., Young, A. L., Wang, Z., Wang, T., Zhang, P., & Wang, D. (2016) · Palaeogeography Palaeoclimatology Palaeoecology · doi:10.1016/j.palaeo.2016.02.058 · Cited by 99 · see citing works
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 99 · see citing works
Molybdenum speciation and burial pathway in weakly sulfidic environments: Insights from XAFS
Wagner, M., Chappaz, A., & Lyons, T. W. (2017) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2017.02.018 · Cited by 92 · see citing works
Self-citation
Quantifying the missing sink for global organic carbon burial during a Cretaceous oceanic anoxic event
Owens, J. D., Lyons, T. W., & Lowery, C. M. (2018) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2018.07.021 · Cited by 95 · see citing works
“The Mo/TOC relationship is well characterized for euxinic settings (Algeo and Lyons, 2006; Scott and Lyons, 2012).”
Self-citation
Transient deep-water oxygenation in the early Cambrian Nanhua Basin, South China
Cheng, M., Li, C., Zhou, L., Feng, L., Algeo, T. J., Zhang, F., Romaniello, S. J., Jin, C., Ling, H., & Jiang, S. (2017) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2017.04.032 · Cited by 93 · see citing works
Persistent global marine euxinia in the early Silurian
Stockey, R., Cole, D. B., Planavsky, N. J., Loydell, D. K., Frýda, J., & Sperling, E. A. (2020) · Nature Communications · doi:10.1038/s41467-020-15400-y · Cited by 95 · see citing works
An evaluation of sedimentary molybdenum and iron as proxies for pore fluid paleoredox conditions
Hardisty, D. S., Lyons, T. W., Riedinger, N., Isson, T. T., Owens, J. D., Aller, R. C., Rye, D. M., Planavsky, N. J., Reinhard, C. T., Gill, B. C., et al. (2018) · American Journal of Science · doi:10.2475/05.2018.04 · Cited by 92 · see citing works
“…water column following reductive dissolution of the oxides during sediment diagenesis (Shimmield and Price, 1986; Goldberg and others, 2012; Scott and Lyons, 2012), with the possibility of little to no authigenic sediment enrichment and thus concentrations near those characteristic of…”
BackgroundInfluentialSelf-citation
Oxygen, facies, and secular controls on the appearance of Cryogenian and Ediacaran body and trace fossils in the Mackenzie Mountains of northwestern Canada
Sperling, E. A., Carbone, C., Strauss, J. V., Johnston, D. T., Narbonne, G. M., & Macdonald, F. A. (2015) · Geological Society of America Bulletin · doi:10.1130/b31329.1 · Cited by 92 · see citing works
“This impacts the utility of trace metals as a proxy because in contrast to classic Phanerozoic anoxic shales, subtle Proterozoic enrichments will be difficult to separate from background levels (Scott and Lyons, 2012).”
Background
Manganese oxide shuttling in pre-GOE oceans – evidence from molybdenum and iron isotopes
Kurzweil, F., Wille, M., Gantert, N., Beukes, N. J., & Schoenberg, R. (2016) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2016.07.013 · Cited by 90 · see citing works
Combining sedimentological, trace metal (Mn, Mo) and molecular evidence for reconstructing past water-column redox conditions: The example of meromictic Lake Cadagno (Swiss Alps)
Wirth, S. B., Gilli, A., Niemann, H., Dahl, T. W., Ravasi, D., Sax, N., Hamann, Y., Peduzzi, R., Peduzzi, S., Tonolla, M., et al. (2013) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2013.06.017 · Cited by 88 · see citing works
Tracing euxinia by molybdenum concentrations in sediments using handheld X-ray fluorescence spectroscopy (HHXRF)
Dahl, T. W., Ruhl, M., Hammarlund, E. U., Canfield, D. E., Rosing, M. T., & Bjerrum, C. J. (2013) · Chemical Geology · doi:10.1016/j.chemgeo.2013.10.022 · Cited by 90 · see citing works
“We find that a minimum of N25 ppm Mo in marine sediments includes almost all modern euxinic depositional environments, consistent with (Scott and Lyons, 2012).”
BackgroundResultInfluential
Iron isotope and trace metal records of iron cycling in the proto‐North Atlantic during the Cenomanian‐Turonian oceanic anoxic event (OAE‐2)
Owens, J. D., Lyons, T. W., Li, X., MacLeod, K. G., Gordon, G., Kuypers, M. M. M., Anbar, A. D., Kuhnt, W., & Severmann, S. (2012) · Paleoceanography · doi:10.1029/2012pa002328 · Cited by 89 · see citing works
“Molybdenum provides an effective, independent constraint on the paleoredox conditions of the local settings [Scott et al., 2008; Scott and Lyons, 2012].”
BackgroundSelf-citation
Marine redox variations and nitrogen cycle of the early Cambrian southern margin of the Yangtze Platform, South China: Evidence from nitrogen and organic carbon isotopes
Wang, D., Struck, U., Ling, H.-F., Guo, Q.-J., Shields-Zhou, G. A., Zhu, M.-Y., & Yao, S.-P. (2015) · Precambrian Research · doi:10.1016/j.precamres.2015.06.009 · Cited by 88 · see citing works
“Meanwhile, low Mobulk concentrations and Mo/TOCbulk ratios (averaging 3 ppm and ∼8, respectively) at Sancha section indicate that euxinic conditions did not spread to the shelf marginal regions (Scott and Lyons, 2012) (Fig.”
BackgroundInfluential
Ocean Circulation in the Toarcian (Early Jurassic): A Key Control on Deoxygenation and Carbon Burial on the European Shelf
Baroni, I. R., Pohl, A., van Helmond, N. A. G. M., Papadomanolaki, N. M., Coe, A. L., Cohen, A. S., van de Schootbrugge, B., Yannick Donnadieu, A., & Slomp, C. P. (2018) · Paleoceanography and Paleoclimatology · doi:10.1029/2018pa003394 · Cited by 88 · see citing works
Molybdenum Burial Mechanism in Sulfidic Sediments: Iron-Sulfide Pathway
Vorlicek, T. P., Helz, G. R., Chappaz, A., Vue, P., Vezina, A., & Hunter, W. (2018) · ACS Earth and Space Chemistry · doi:10.1021/acsearthspacechem.8b00016 · Cited by 87 · see citing works
Controls on organic matter accumulation on the early-Cambrian western Yangtze Platform, South China
Jin, C., Li, C., Algeo, T. J., Wu, S., Cheng, M., Zhang, Z., & Shi, W. (2019) · Marine and Petroleum Geology · doi:10.1016/j.marpetgeo.2019.08.005 · Cited by 87 · see citing works
Widespread coastal upwelling along the Eastern Paleo-Tethys Margin (South China) during the Middle Permian (Guadalupian): Implications for organic matter accumulation
Zhang, B., Yao, S., Wignall, P. B., Hu, W., Ding, H., Liu, B., & Ren, Y. (2018) · Marine and Petroleum Geology · doi:10.1016/j.marpetgeo.2018.06.025 · Cited by 86 · see citing works
Marine redox conditions in the middle Proterozoic ocean and isotopic constraints on authigenic carbonate formation: Insights from the Chuanlinggou Formation, Yanshan Basin, North China
Li, C., Planavsky, N. J., Love, G. D., Reinhard, C. T., Hardisty, D. S., Feng, L., Bates, S. M., Huang, J., Zhang, Q., Chu, X., et al. (2014) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2014.12.005 · Cited by 87 · see citing works
Self-citation
The spread of marine anoxia on the northern Tethys margin during the Paleocene-Eocene Thermal Maximum
Dickson, A. J., Rees-Owen, R. L., März, C., Coe, A. L., Cohen, A. S., Pancost, R. D., Taylor, K. W. R., & Анатольевна, Щ. Е. (2014) · Paleoceanography · doi:10.1002/2014pa002629 · Cited by 85 · see citing works
“[Re] abundances, measured for the first time from this section, are also significantly enriched above crustal abundances, consistent with the local presence of an oxygen-depleted water mass [Crusius et al., 1996; Scott and Lyons, 2012].”
BackgroundInfluential
Uranium isotope compositions of mid-Proterozoic black shales: Evidence for an episode of increased ocean oxygenation at 1.36 Ga and evaluation of the effect of post-depositional hydrothermal fluid flow
Yang, S., Kendall, B., Lu, X., Zhang, F., & Zheng, W. (2017) · Precambrian Research · doi:10.1016/j.precamres.2017.06.016 · Cited by 84 · see citing works
“intermittent water column euxinia (Kendall et al., 2009; Scott and Lyons, 2012).”
BackgroundInfluential
What the ~1.4 Ga Xiamaling Formation can and cannot tell us about the mid‐Proterozoic ocean
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“…of free sulfide, remain below minimum thresholds 358 established for euxinic mudstones (25 ppm Mo-depleted waters, 65 ppm Mo-replete waters, 359 17 Scott and Lyons, 2012), but molybdenum concentrations and Mo/Al values do exceed average 360 shale values (2.6 ppm and 0.32x10 -4 respectively,…”
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“Values > 5 (‘‘significantly enric and Huested, 1991; Scott and Lyons, 2012) and Tribovillard et al.”
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“Sedimentary molybdenum (Mo) content is a well-established proxy for past redox fluctuations in bottom waters overlying marine sediments (e.g., Algeo and Lyons, 2006; Scott and Lyons, 2012; Helz and Adelson, 2013).”
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“…to enrich in sediments underlying sulfidic water columns due to the reactions of molybdate with water column sulfide to form tetrathiomolybdate, which is particle-reactive and is efficiently buried with organic matter (Algeo & Lyons, 2006; Dahl, Chappaz, Fitts, & Lyons, 2013; Scott & Lyons, 2012).”
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“…ferruginous conditions (black) are distinguished from oxic conditions (white) by > 25 ppm Mo and/or Fe HR /Fe T > 0.38 and Fe P /Fe HR > 0.7 (Scott and Lyons, 2012; Dahl et al., 2013b). we predict that the euxinic Mo and U burial fractions (f Mo,EUX, f U,EUX ) increase and produce larger Mo…”
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Comportamiento geoquímico del molibdeno y sus isótopos en el ambiente sedimentario: Un resumen bibliográfico
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Molybdenum speciation as a paleo-redox proxy: A case study from Late Cretaceous Western Interior Seaway black shales
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Comportamiento geoquímico del molibdeno y sus isótopos en el ambiente sedimentario - Un resumen bibliográfico Geochemical behavior of molybdenum and its isotopes in the sedimentary environment - A bibliographic review
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Intense molybdenum accumulation in sediments underneath a nitrogenous water column and implications for the reconstruction of paleo-redox conditions based on molybdenum isotopes
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Authors: Scott, C., & Lyons, T. W.
Affiliations: University of California, Riverside (US)
Corresponding author: Scott, Clint
ORCID: Scott, Clint
Lyons, Timothy W.
Venue: Chemical Geology
Publisher: Elsevier BV
Published: 2012-09
Volume: 324-325
Pages: 19-27
ISSN: 0009-2541 (ISSN-L)
DOI: 10.1016/j.chemgeo.2012.05.012
OpenAlex: W2005604628
Cited by: 745
References: 80
Citations by year: 2026: 64 · 2025: 71 · 2024: 65 · 2023: 75 · 2022: 64 · 2021: 75 · 2020: 74 · 2019: 43 · 2018: 50 · 2017: 53 · 2016: 37 · 2015: 32 · 2014: 23 · 2013: 13 · 2012: 5
FWCI: 17.36
Type: journal article
Language: en
Open access: closed
Licence: www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations: Chemical 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 › Geophysics › Geological and Geochemical Analysis
Keywords: molybdenum isotopes, paleoredox proxies, black shales, total organic carbon, bottom water oxygenation, marine sediment, sedimentary rock

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