D/H and18O/16O ratios of minerals of possible mantle or lower crustal origin

https://doi.org/10.1016/0012-821X(70)90033-6Get rights and content

Abstract

D/H and18O/16O analyses are reported for 16 phlogopites from 11 alkalic intrusions in the USA, Canada, South Africa, India and Australia. The D/H ratio of unaltered phlogopite of possible mantle or lower crustal origin is−58 ± 18per mil, with no significant variation through space or time over the last 1140 my. Phlogopites and calcites from Bachelor Lake, Quebec, and hornblendes and a serpentine from St. Paul's Rocks have undergone some isotopic exchange, possibly with ocean water at the latter locality.

The D/H ratio in “juvenile water” is estimated to be−48 ± 20per mil.

Reference (32)

  • TaylorH.P.

    The oxygen isotope geochemistry of igneous rocks

    Contrib. Mineral. Petrol.

    (1968)
  • TaylorH.P. et al.

    Hydrogen isotope evidence for influx of meteoric ground water into shallow igneous intrusives

  • S.M.F. Sheppard and H.P. Taylor, Jr., Hydrogen and oxygen isotope evidence for the origin of water in the Butte ore...
  • EpsteinS. et al.

    Variation of O18/O16 in minerals and rocks

  • TaylorH.P. et al.

    Deuterium-hydrogen ratios in coexisting minerals of metamorphic and igneous rocks

    Trans. Am. Geophys. Union

    (1966)
  • TaylorH.P.

    Stable isotope studies of ultramafic rocks and meteorites

  • Cited by (100)

    • Chemical variability in volcanic gas plumes and fumaroles along the East African Rift System: New insights from the Western Branch

      2022, Chemical Geology
      Citation Excerpt :

      Previous data obtained in volcanic gas plumes and fumaroles at persistently active volcanoes along the EARS are compiled from Gerlach (1982), Oppenheimer et al. (2002), Pik et al. (2006), Sawyer et al. (2008a, 2008b), Fischer et al. (2009), Tedesco et al. (2010), Bobrowski et al. (2017a,b), Boucher et al. (2018) and Mollex et al. (2018). The composition of the end-members used to define the mixing curves are defined from the following literature: DMM (Sheppard and Epstein, 1970; Gautheron and Moreira, 2002; Zelenski and Taran, 2011; Clog et al., 2013; Barry et al., 2013; Hallis et al., 2015; Rizzo et al., 2018), African Superplume (Pik et al., 2006; Darrah et al., 2013), SCLM (Gautheron and Moreira, 2002; Rizzo et al., 2018), Continental Crust (Zelenski and Taran, 2011; Taran and Zelenski, 2015), Oceanic Crust (Zelenski and Taran, 2011; Barry et al., 2013; Taran and Zelenski, 2015), Limestone (Barry et al., 2013), Sediments (Zelenski and Taran, 2011; Barry et al., 2013), Mantle carbonates (Harmer, 1999; Casola et al., 2020; Carnevale et al., 2021), Air and ASW (Zelenski and Taran, 2011). MultiGAS measurements in volcanic gas plumes performed in February 2020 reveal an average CO2/SO2 ratio of 22 ± 8.4 and 15.5 ± 5.7 and an average H2O/CO2 ratio of 1.9 ± 0.2 and 12.4 ± 6.3 at Nyiragongo and Nyamulagira, respectively (Fig. 2a).

    • Sources and transport of fluid and heat at the newly-developed Theistareykir Geothermal Field, Iceland

      2020, Journal of Volcanology and Geothermal Research
      Citation Excerpt :

      Magmatic water is considered to be water in its aqueous or gaseous phase in equilibrium with the magma and originating from the expulsed fluids of the crystalized magma (Sheppard et al., 1969). Magmatic water composition depends on the parent magma, but generally exhibits high salinities and δ2H and δ18O values ranging from −80‰ to −10‰ and +6‰ to +10‰ respectively (Sheppard and Epstein, 1970). Here below, the different fluid sources are discriminated and fluid ages proposed using stable isotopes of water and noble gases.

    View all citing articles on Scopus

    Publications of the Division of Geological Sciences, California Institute of Technology, Pasadena, California, Contribution No. 1725.

    **

    Now at Scottish Research Reactor Centre, East Kilbride, Scotland.

    View full text