Activity-composition relations for the calculation of partial melting equilibria in metabasic rocks
Activity-composition relations for the calculation of partial melting equilibria in metabasic rocks
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DOI：
10.1111/jmg.12211
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发表时间：
2016-12-01
影响因子：
3.4
通讯作者：
Palin, R. M.
中科院分区：
文献类型：
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作者：
Green, E. C. R.;White, R. W.;Palin, R. M.
提出了一组热力学模型，首次允许计算变基性岩的部分熔融平衡。该模型由新的活性-成分关系与 Holland & Powell 数据集第 6 版的端元热力学性质相结合组成。它们允许在 Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-H2O-TiO2- Fe2O3 系统中进行正向建模。特别是，针对广泛的长辉石-英闪长岩组成的硅酸盐熔体和在四面体位点上具有 Si-Al 混合的辉石单斜辉石，提出了新的活性-组成关系，而角闪石的现有活性-组成关系扩展到包括 K2O 和 TiO2。进行活性-成分关系的校准，目的是重现主要实验分阶段/分阶段边界，这些边界定义了一系列散装成分的角闪岩-麻粒岩转变，
A set of thermodynamic models is presented that, for the first time, allows partial melting equilibria to be calculated for metabasic rocks. The models consist of new activity-composition relations combined with end-member thermodynamic properties from the Holland & Powell dataset, version 6. They allow for forward modelling in the system Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-H2O-TiO2- Fe2O3. In particular, new activity-composition relations are presented for silicate melt of broadly trondhjemitic-tonalitic composition, and for augitic clinopyroxene with Si-Al mixing on the tetrahedral sites, while existing activity-composition relations for hornblende are extended to include K2O and TiO2. Calibration of the activity-composition relations was carried out with the aim of reproducing major experimental phase-in/phase-out boundaries that define the amphibolite-granulite transition, across a range of bulk compositions, at