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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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“Supporting this choice, a crossplot of (Fepy FeAVS)/FeHR versus Mo (not shown) indicates that Mo concentrations 25 ppm, which are typical of euxinic deposition (Scott and Lyons, 2012), are nearly exclusively associated with (Fepy FeAVS)/FeHR values 0.6.”
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“This kind of combination is irreversible [Bostick et al., 2003], which would lead to more Mo deposit under the more organic carbon exporting and euxinic condition [Scott et al., 2008; Scott and Lyons, 2012].”
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“org/10 upper pore water or water column in order to develop significant authigenic enrichments (Dahl et al., 2013; Little et al., 2015; Scott and Lyons, 2012), which limits its utility as a paleo-redox proxy in pervasively ferruginous Neoproterozoic oceans (Canfield et al.”
Background
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“Therefore, enrichments of 334 elementary Mo can be used as an indicator for sea floor deoxygenation (Thomson et al., 1995; 335 Scott and Lyons, 2012).”
Background
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“These concentrations are well below that of modern euxinic marine sediments (30–200 ppm), average Proterozoic shales (24 ppm) and contemporaneous euxinic shales deposited in the Datangpo Fm, South China (∼5–30 ppm) (Dahl et al., 2013; Li et al., 2012; Scott and Lyons, 2012; Scott et al., 2008).”
Background
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“…evolution marked by waning inputs and increasing evaporation: First, our molybdenum concentrations of up to 22 ppm would be rare in sediments from oxic settings because they often lack the accumulation of free sulfide in the water column that seems key to Mo enrichment (Scott and Lyons, 2012).”
BackgroundSelf-citation
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“An average Mo concentration of 59.3 ppm also indicates intermittent euxinic conditions (Scott and Lyons, 2012).”
BackgroundInfluential
A very unconventional hydrocarbon play: The Mesoproterozoic Velkerri Formation of northern Australia
Cox, G. M., Collins, A. S., Jarrett, A. J. M., Blades, M., Shannon, A., Yang, B., Farkaš, J., Hall, T., O’Hara, B., Close, D., et al. (2022) · AAPG Bulletin · doi:10.1306/12162120148 · Cited by 44
“Furthermore, molybdenum also complexes with organic molecules; however, this process still requires hydrogen sulfide of ~10 uM (Erickson and Helz, 2000) to quantitatively form particle reactive thiomolybdates (Scott and Lyons, 2012).”
BackgroundInfluential
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“…compare sediment values of C ORG /P TOT , C ORG /P ORG (due to diagenesis, only for sapropels and modern sediments), and Fe over aluminum (Fe/Al) and molybdenum (Mo), two redox proxies ( 33 , 34 ), to illustrate that anoxia alone does not explain the high C ORG /P TOT values of ancient sediments.”
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THE LAST GASP: TRACE FOSSILS TRACK DEOXYGENATION LEADING INTO THE FRASNIAN–FAMENNIAN EXTINCTION EVENT
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“…and fluctuating), anoxic, dysoxic, and oxic depositional conditions (Arthur and Sageman 1994; Wignall 1994; Rimmer 2004; McManus et al. 2006; Scott and Lyons 2012), and this particular redox proxy has been successfully used in combination with paleontological proxies in other studies (see…”
BackgroundMethod
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“In case of persistent euxinic bottom waters, enrichments have a much wider range with concentrations consistently >60 mg/kg up to 100 mg/kg (Scott and Lyons, 2012).”
Background
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“Sedimentary Mo concentrations greater than 20 ppm (of total rock mass) are generally considered intermittently euxinic, while concentrations over 60 ppm are predominantly or permanently euxinic (Scott & Lyons, 2012).”
Background
Discussion on the characteristics and controlling factors of differential enrichment of shale gas in the Wufeng-Longmaxi formations in south China
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“Furthermore, Scott and Lyons (2012) suggested a non-euxinic condition with the presence of sulfide in pore waters when Mo concentrations range from > 2 µgg−1 to 25 µgg−1.”
Background
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“Therefore, as an example, the presence of Mo at a site is interpreted as evidence for anoxia, and we forego the use of Mo concentrations for a further redox classification as done, for example, by Scott and Lyons (2012).”
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Background
Volcanically modulated pyrite burial and ocean–atmosphere oxidation
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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 › Geochemistry and Petrology › 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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Contrasting molybdenum cycling and isotopic properties in euxinic versus non-euxinic sediments and sedimentary rocks: Refining the paleoproxies

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