Abstract
We present high-pressure experiments up to 8 GPa that constrain the solidus and liquidus of a composition, Fe0.69Ni0.23Cu0.01S1.00, typical of upper mantle sulfide. Solidus and liquidus brackets of this monosulfide are parameterized according to a relation similar to the Simon-Glatzel equation, yielding, respectively, T (°C) = 1015.1 [P(GPa)/1.88 + 1]0.206 and T (°C) = 1067.3 [P(GPa)/1.19 + 1]0.149 (1 ≤ P ≤ 8). The solidus fit is accurate within ±15 °C over the pressure intervals 1–3.5 GPa and within ±30 °C over the pressure intervals 3.5–8.0 GPa. The solidus of the material examined is cooler than the geotherm for convecting mantle, but hotter than typical continental geotherms, suggesting that sulfide is molten or partially molten through much of the convecting upper mantle, but potentially solid in the continental mantle. However, the material examined is one of the more refractory among the spectrum of natural mantle sulfide compositions. This, together with the solidus-lowering effects of O and C not constrained by the present experiments, indicates that the experimentally derived melting curves are upper bounds on sulfide melting in the Earth's upper mantle and that the regions where sulfide is molten are likely extensive in both the convecting upper mantle and, potentially, the deeper parts of the oceanic and continental lithosphere, including common source regions of many diamonds.
Acknowledgments
We are grateful for the constructive reviews from James Brenan and Glenn Gaetani. We appreciate the aid and advice of UMN colleagues: Anthony Withers in the experimental petrology laboratory, Anette von der Handt in the electron microprobe laboratory, and Chris Crosby in the geobiology laboratory. We acknowledge the support of grants NSF EAR1119295 and EAR1426772.
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- Experimental constraints on mantle sulfide melting up to 8 GPa
- Article
- Excess mixing volume, microstrain, and stability of pyrope-grossular garnets
- Article
- Phase stabilities and spin transitions of Fe3(S1−xPx) at high pressure and its implications in meteorites
- Special Collection: Building Planets: The Dynamics and Geochemistry of Core Formation
- The W-WO2 oxygen fugacity buffer (WWO) at high pressure and temperature: Implications for fO2 buffering and metal-silicate partitioning
- Special Collection: Rates and Depths of Magma Ascent on Earth
- Timescales of magma storage and migration recorded by olivine crystals in basalts of the March-April 2010 eruption at Eyjafjallajökull volcano, Iceland
- Letter
- In-situ crystal structure determination of seifertite SiO2 at 129 GPa: Studying a minor phase near Earth's core–mantle boundary
- New Mineral Names
- New Mineral Names*,†
- Book Review
- A Pictorial Guide to Metamorphic Rocks in the Field