Resolution of inter-laboratory discrepancies in Mo isotope data: an intercalibration

Goldberg, Tatiana; Gordon, Gwyneth W.; Izon, Gareth; Archer, Corey; Pearce, Christopher R.; McManus, James; Anbar, Ariel D.; Rehkämper, Mark

doi:10.1039/c3ja30375f

Cited by 155 publications

(135 citation statements)

References 68 publications

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“…The NIST SRM 3134 Mo solution has been proposed as a universal zero-delta reference material for expressing Mo isotope data in delta notation for natural samples (Wen et al 2010, Greber et al 2012, Goldberg et al 2013. As demonstrated by Greber et al (2012) and Goldberg et al (2013) (Dodson 1963).…”

Section: Received 23 Apr 15 -Accepted 10 Aug 15mentioning

confidence: 97%

“…As demonstrated by Greber et al (2012) and Goldberg et al (2013) (Dodson 1963). The matrices of these reference materials vary greatly and include igneous rocks ranging from ultramafic to acidic in composition, sedimentary materials, molybdenite, seawater and coral (Table 1).…”

Section: Received 23 Apr 15 -Accepted 10 Aug 15mentioning

confidence: 98%

“…The accuracy and longterm reproducibility were further evaluated by analysing seawater samples from the Atlantic Ocean over a period of 2 years (Table 1, Figure 2). Previous studies showed that the d 98/95 Mo of modern open-ocean water accounts for some of the variation, and reflect a small inherent heterogeneity within ± 0.10‰ (2s) (Siebert et al 2003, Greber et al 2012, Nakagawa et al 2012, Goldberg et al 2013. Greber et al (2012) renormalised their Mo isotope data for seawater to NIST SRM 3134 = 0‰ and obtained a value of 2.09 ± 0.07‰ (2s, n = 5).…”

Section: Procedures Validationmentioning

confidence: 99%

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Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

Zhao

Zhang

et al. 2015

Geostandard Geoanalytic Res

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The double-spike method with multi-collector inductively coupled plasma-mass spectrometry was used to measure the Mo mass fractions and isotopic compositions of a set of geological reference materials including the mineral molybdenite, seawater, coral, as well as igneous and sedimentary rocks. The long-term reproducibility of the Mo isotopic measurements, based on two-year analyses of NIST SRM 3134 reference solutions and seawater samples, was ≤ 0.07‰ (two standard deviations, 2s, n = 167) for d Molybdenum (Mo) is one of the most abundant transition metals in the oceans and is important for a range of biological and geochemical processes (Manheim and Landergren 1974, Colodner et al. 1995, Morford and Emerson 1999. It has seven stable isotopes with relative abundances ranging from 9% to 25%, covering a mass range of about 8% (Anbar 2004). Molybdenum isotopes are increasingly being used in Earth sciences. Of particular interest is the highly redox-sensitive behaviour of Mo, which is primarily used to investigate the oxygenation of Earth's ocean and atmosphere (Barling et al.

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Section: Received 23 Apr 15 -Accepted 10 Aug 15mentioning

confidence: 97%

Section: Received 23 Apr 15 -Accepted 10 Aug 15mentioning

confidence: 98%

Section: Procedures Validationmentioning

confidence: 99%

See 1 more Smart Citation

Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

Zhao

Zhang

et al. 2015

Geostandard Geoanalytic Res

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“…Uncertainties shown in Fig. 1 represent 2 SD of the mean (analytical precision) plus the propagated uncertainty from matching in-house reference materials to the universal standard NIST SRM 3136 where seawater display δ 98/95 Mo = 2.3‰ (75,76). The redox state of the host shales was determined using either Fe speciation or Mo enrichment proxies.…”

Section: Methodsmentioning

confidence: 99%

Earliest land plants created modern levels of atmospheric oxygen

Lenton

Dahl

Daines

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

274

224

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The progressive oxygenation of the Earth's atmosphere was pivotal to the evolution of life, but the puzzle of when and how atmospheric oxygen (O 2 ) first approached modern levels (∼21%) remains unresolved. Redox proxy data indicate the deep oceans were oxygenated during 435-392 Ma, and the appearance of fossil charcoal indicates O 2 >15-17% by 420-400 Ma. However, existing models have failed to predict oxygenation at this time. Here we show that the earliest plants, which colonized the land surface from ∼470 Ma onward, were responsible for this mid-Paleozoic oxygenation event, through greatly increasing global organic carbon burialthe net long-term source of O 2 . We use a trait-based ecophysiological model to predict that cryptogamic vegetation cover could have achieved ∼30% of today's global terrestrial net primary productivity by ∼445 Ma. Data from modern bryophytes suggests this plentiful early plant material had a much higher molar C:P ratio (∼2,000) than marine biomass (∼100), such that a given weathering flux of phosphorus could support more organic carbon burial. Furthermore, recent experiments suggest that early plants selectively increased the flux of phosphorus (relative to alkalinity) weathered from rocks. Combining these effects in a model of long-term biogeochemical cycling, we reproduce a sustained +2‰ increase in the carbonate carbon isotope (δ 13 C) record by ∼445 Ma, and predict a corresponding rise in O 2 to present levels by 420-400 Ma, consistent with geochemical data. This oxygen rise represents a permanent shift in regulatory regime to one where fire-mediated negative feedbacks stabilize high O 2 levels.oxygen | Paleozoic | phosphorus | plants | weathering

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“…Previous studies argued that the Ni-Mo enrichments in the sediments could originate from hydrothermal input (Lott et al, 1999;Steiner et al, 2001), enrichment from seawater (Lehmann et al, 2007;Mao et al, 2002), or more likely the combination of both processes (Pašava et al, 2008). Recent studies demonstrated that the Ni-Mo sulfide ore layer, which is usually less than half meters in thickness (Jiang et al, 2006), has relatively lower ␦ 98 Mo values (<1.6‰) (Lehmann et al, 2007;Xu et al, 2012) (low-temperature hydrothermal fluids ␦ 98 Mo = +0.8‰, McManus et al, 2002), while black shales above and below this Ni-Mo ore layer have high ␦ 98 Mo values (∼1.9-2.4‰) (Chen et al, 2015) (modern seawater ␦ 98 Mo = +2.34‰, Goldberg et al, 2013), suggesting that hydrothermal input of Mo may have contributed only to the Ni-Mo ore layer, but not to the adjacent black shales (Chen et al, 2015). Thus Mo enrichment in the black shales resulted from redox processes and could provide information about the ocean Mo reservoir.…”

Section: Cambrian Stagementioning

confidence: 99%

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

Struck

Guo

et al. 2015

Precambrian Research

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Resolution of inter-laboratory discrepancies in Mo isotope data: an intercalibration

Cited by 155 publications

References 68 publications

Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

Earliest land plants created modern levels of atmospheric oxygen

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

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