Zn and Cu isotopic variability in the Alexandrinka volcanic-hosted massive sulphide (VHMS) ore deposit, Urals, Russia

Mason, T. F. D.; Weiss, Dominik; Chapman, John; Wilkinson, Jamie J.; Tessalina, Svetlana; Spiro, Baruch; Horstwood, Matthew; Spratt, John; Coles, Barry J.

doi:10.1016/j.chemgeo.2005.04.011

Cited by 216 publications

(95 citation statements)

References 25 publications

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“…This suggests that microwave digestion is more effective in breaking down the organic matrix of plants, similar to the findings regarding elemental analysis of plants (Papp and Fischer, 1987;Adeloju, 1989). The larger errors for the rock samples can be accounted for by the fact that they were mineralogical complex whole rock samples (schist, dolomites) rather than the relatively 'simple' mineral separates analysed by Mason et al (2005) or Wilkinson et al (2005).…”

Section: Interferences and Mass Bias Effectssupporting

confidence: 55%

Atmospheric deposition and isotope biogeochemistry of zinc in ombrotrophic peat

Weiss

Rausch

Mason

et al. 2007

Geochimica et Cosmochimica Acta

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122

107

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Section: Interferences and Mass Bias Effectssupporting

confidence: 55%

Atmospheric deposition and isotope biogeochemistry of zinc in ombrotrophic peat

Weiss

Rausch

Mason

et al. 2007

Geochimica et Cosmochimica Acta

Self Cite

122

107

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“…By analyzing sphalerites from ore deposits, Mason et al (2005), Wilkinson et al (2005), Kelley et al (2009), Gagnevin et al (2012 and Zhou et al (2014) observed Zn isotope variations of about 1.5 ‰. These studies indicate that early precipitated sphalerites have higher 64 Zn-values than late precipitates.…”

Section: Ore Depositsmentioning

confidence: 89%

Isotope Fractionation Processes of Selected Elements

Hoefs

2015

Stable Isotope Geochemistry

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“…Regardless, the limited data on white smoker fluids do not indicate anomalous Zn isotope compositions (27). More generally, the range of variations of δ 66 Zn in sulfide ores from a wide variety of depositional environments (20,21,27,30,31) and, as shown in this study, also in Alpine ophiolites and Gakkel serpentinites, is quite narrow: The striking lack of negative δ 66 Zn values indicates that if Zn sulfate complexes were present in the parent hydrothermal fluid, they were not abundant enough to create major Zn isotope fractionation in hydrothermal solutions and sulfide deposits. Moreover, sulfate is widely thought to be missing from the Archean ocean (32), and the dominant sulfur species in Isua serpentinites is sulfide, not sulfate.…”

Section: Resultsmentioning

confidence: 99%

Early Archean serpentine mud volcanoes at Isua, Greenland, as a niche for early life

Pons

Quitté

Fujii

et al. 2011

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

101

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The Isua Supracrustal Belt, Greenland, of Early Archean age (3.81-3.70 Ga) represents the oldest crustal segment on Earth. Its complex lithology comprises an ophiolite-like unit and volcanic rocks reminiscent of boninites, which tie Isua supracrustals to an island arc environment. We here present zinc (Zn) isotope compositions measured on serpentinites and other rocks from the Isua supracrustal sequence and on serpentinites from modern ophiolites, midocean ridges, and the Mariana forearc. In stark contrast to modern midocean ridge and ophiolite serpentinites, Zn in Isua and Mariana serpentinites is markedly depleted in heavy isotopes with respect to the igneous average. Based on recent results of Zn isotope fractionation between coexisting species in solution, the Isua serpentinites were permeated by carbonate-rich, high-pH hydrothermal solutions at medium temperature (100-300°C). Zinc isotopes therefore stand out as a pH meter for fossil hydrothermal solutions. The geochemical features of the Isua fluids resemble the interstitial fluids sampled in the mud volcano serpentinites of the Mariana forearc. The reduced character and the high pH inferred for these fluids make Archean serpentine mud volcanoes a particularly favorable setting for the early stabilization of amino acids.hydrothermal fluids | serpentinization | origin of life | subduction zone T he discovery of oceanic black smokers and their unique fauna prompted the idea that life may have sprung from hydrothermal vent fields at the bottom of the ocean (1-3). The highly reducing conditions of the vent fields associated with midocean ridges fulfill one of the most stringent conditions for the stabilization of biomolecules. These conditions are a consequence of the metamorphic hydration and oxidation of ultramafic rocks of the oceanic lithosphere-a series of reactions known as serpentinization-that release highly reduced hydrothermal fluids with high concentrations of methane, ammonia, and hydrogen (4, 5). Serpentinization also produces FeNi 3 , which catalyses formation of complex organic compounds (5). Serpentinization thus provides both a source of reduced carbon and a potential energy source, which, together, create an environment suitable for the emergence of the first biomolecules. The vast majority of hydrothermal vent fields, however, especially those hosted by midocean ridges, spout solutions with pH well below the pK of amino acids, which makes them unsuitable for Strecker synthesis (6, 7). Attention therefore shifted toward high-pH hydrothermal vent sites (8, 9) and notably toward the modern vent fluids from the unusual midocean ridge locality of Lost City.The search for an Archean environment in which reducing and high-pH conditions coexist at temperatures appropriate for supporting early life prompted us to investigate Isua serpentinites and their associated hydrothermal carbonates (10). Precipitation of large amounts of carbonates suggests that carbonate ions were abundant in the parent fluid and therefore signals that the pH of this fluid was...

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Zn and Cu isotopic variability in the Alexandrinka volcanic-hosted massive sulphide (VHMS) ore deposit, Urals, Russia

Cited by 216 publications

References 25 publications

Atmospheric deposition and isotope biogeochemistry of zinc in ombrotrophic peat

Atmospheric deposition and isotope biogeochemistry of zinc in ombrotrophic peat

Isotope Fractionation Processes of Selected Elements

Early Archean serpentine mud volcanoes at Isua, Greenland, as a niche for early life

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