Compositions, Proportions, and Equilibrium Temperature of Coexisting Two-feldspar in Crystalline Rocks
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Compositions, Proportions, and Equilibrium Temperature of Coexisting Two-feldspar in Crystalline Rocks
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This research was granted by the National Eleventh Five-year Supporting Plan for Science and Technology (2006BAD10B04), and China Geological Survey Project (12120113087700). Calculation of the example hornblende syenite in the research was performed by PhD student Ma Xi. We appreciate Prof. Bai Zhimin and Dr. Li Tianfu for helpful discussions on the early version of the manuscript, and Prof. Wei Chunjing and Prof. Luo Zhaohua for constructive comments on the paper.

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    Abstract:

    Compositions, proportions, and equilibrium temperature of coexisting two-feldspar in crystalline rocks are of great importance to classification in petrography and interpretation of petrogenesis. Crystalline rocks are usually composed of 4-6 minerals (phases), depending on their independent chemical components and the equilibrium temperature of crystallizations. In general, number of mineral phases can be determined by the “Phase Rule”. According to the mass balance principle, bulk composition of coexisting two-feldspar could be evaluated from the bulk chemistry of a rock, provided that the compositions of the coexisting mafic mineral phases containing calcium, sodium, and potassium oxides are determined, e.g., by microprobe analysis. The compositions, proportions, and temperature of two-feldspar in equilibrium can thus be simultaneously resolved numerically from bulk composition of the rock, by incorporating the activity/composition relations of the ternary feldspars with the mass balance constraints. Upon the numerical approximation method presented in this paper, better-quality, internally consistent data on feldspar group could usually be obtained, which would be expected more realistic and accurate in consideration of thermodynamic equilibria in the system of crystalline rocks, as well as bulk chemistry of a rock and the composing minerals.

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MA Hongwen, YANG Jing, SU Shuangqing, YAO Wengui.2017. Compositions, Proportions, and Equilibrium Temperature of Coexisting Two-feldspar in Crystalline Rocks[J]. ACTA GEOLOGICA SINICA(English edition),91(3):875~881

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  • 收稿日期:2016-03-20
  • 最后修改日期:2016-07-08
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  • 在线发布日期: 2017-06-08
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