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Experimental studies of oxygen isotope fractionation between rhodochrosite (MnCO3) and water at low temperatures |
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| Authors: | Sang-Tae Kim Jung Ok Kang James R O’Neil |
| Institution: | a Department of Earth & Planetary Sciences, McGill University, Montreal, PQ, Canada H3A 2A7 b Department of Geology/ESSIC, University of Maryland, College Park, MD 20742, USA c Department of Earth & Environmental Sciences and Environmental Geosphere Research Laboratory (EGRL), Korea University, Seoul 136-701, Republic of Korea d Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109, USA |
| Abstract: | Rhodochrosite crystals were precipitated from Na-Mn-Cl-HCO3 parent solutions following passive, forced and combined passive-to-forced CO2 degassing methods. Forced and combined passive-to-forced CO2 degassing produced rhodochrosite crystals with a small non-equilibrium oxygen isotope effect whereas passive CO2 degassing protocols yielded rhodochrosite in apparent isotopic equilibrium with water. On the basis of the apparent equilibrium isotopic data, a new temperature-dependent relation is proposed for the oxygen isotope fractionation between rhodochrosite and water between 10 and 40 °C: 1000lnαrhodochrosite-water=17.84±0.18(103/T)-30.24±0.62 |
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