Effect of polymorphic transition on oxygen isotope fractionation between aragonite, calcite, and water: A low-temperature experimental study
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Gen-Tao Zhou
Abstract
The polymorphic transition from aragonite to calcite is a common phenomenon in nature and laboratory experiment, but its effect on O-isotope fractionation between secondary calcite and water is not known. Low-temperature synthesis experiments were carried out in this study to decipher the behavior of O-isotope fractionation between CaCO3 and H2O during this process. The initial aragonite was synthesized by one- and two-step overgrowth techniques at 50 and 70 °C, respectively, with a difference in the duration of O-isotope exchange between dissolved carbonate and water prior to initial aragonite precipitation. Calcite was then synthesized by in situ polymorphic transition from the precursor aragonite in aqueous solution at the same temperatures. SEM observations show that the phase transition from aragonite to calcite proceeded in the mechanism of dissolution-reprecipitation. Although different approaches were employed to synthesize the starting aragonites, O-isotope analyses of product calcite and coexisting water unanimously yield consistent calcite-water fractionations relative to temperature. This finding demonstrates that calcite derived from polymorphic transition of aragonite can readily achieve O-isotope equilibrium with water regardless of its precursor composition. In particular, not only is the calcite-water fractionation relationship obtained in this study at 50 to 70 °C in agreement with that extrapolated from the literature data by slow precipitation experiments at 0 to 40 °C, but also the experimental calcite-water fractionations available at 25 to 70 °C are in close agreement with theoretically calculated fractionations. These results indicate that O-isotope equilibrium between calcite and water may prevail in calcite formed by the mechanism of dissolution-reprecipitation in aqueous solution despite different reaction paths.
© 2015 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
- A synthesis of systematic mineralogy
- Oxidation/alteration of pentlandite and pyrrhotite surfaces at pH 9.3: Part 1. Assignment of XPS spectra and chemical trends
- Oxidation of pentlandite and pyrrhotite surfaces at pH 9.3: Part 2. Effect of xanthates and dissolved oxygen
- X-ray Rietveld refinement and FTIR spectra of synthetic (Si,Ge)-richterites
- Influence of crystal chemistry on ideal plastic shear anisotropy in forsterite: First principle calculations
- High-temperature Mössbauer study of Fe-substituted mullite
- Pressure and temperature-dependence of water solubility in Fe-free wadsleyite
- Quartz exsolution in clinopyroxene is not proof of ultrahigh pressures: Evidence from eclogites from the Eastern Blue Ridge, Southern Appalachians, U.S.A.
- The visible and infrared spectral properties of jarosite and alunite
- Wakabayashilite, [(As,Sb)6S9][As4S5]: Crystal structure, pseudosymmetry, twinning, and revised chemical formula
- Compression of albite, NaAlSi3O8
- Effect of polymorphic transition on oxygen isotope fractionation between aragonite, calcite, and water: A low-temperature experimental study
- Effect of current density on the electron microprobe analysis of alkali aluminosilicate glasses
- A high-pressure polytypic transformation in type-I chlorite
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- Mazzite-Na, a new zeolite from Boron, California: Its description and crystal structure
- Low-temperature illitization of smectite in the late eocene and early oligocene of the Isle of Wight (Hampshire basin), U.K.
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- Optical and near infrared spectra of ringwoodite to 21.5 GPa: Implications for radiative heat transport in the mantle
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