Activity-composition relations for the calculation of partial melting equilibria in metabasic rocks

E. C. R. Green; R. W. White; J. F. A. Diener; R. Powell; T. J. B. Holland; R. M. Palin

doi:10.1111/jmg.12211

Activity-composition relations for the calculation of partial melting equilibria in metabasic rocks

E. C. R. Green^*, R. W. White, J. F. A. Diener, R. Powell, T. J. B. Holland, R. M. Palin

^*Corresponding author for this work

School of Earth & Environmental Sciences

Research output: Contribution to journal › Article › peer-review

Abstract

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 ≤13 kbar.

Original language	English
Pages (from-to)	845-869
Number of pages	25
Journal	Journal of Metamorphic Geology
Volume	34
Issue number	9
Early online date	31 Aug 2016
DOIs	https://doi.org/10.1111/jmg.12211
Publication status	Published - 6 Nov 2016

Keywords

Amphibolite
Calibration
Granulite
Holland & Powell dataset
Pseudosection

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10.1111/jmg.12211

Richard William White
- rww3st-andrews.acuk
- School of Earth & Environmental Sciences - Head of School, Professor of Earth Sciences
Person: Academic

Cite this

@article{1e98847bf3ba493cb1df3c389eeba5be,

title = "Activity-composition relations for the calculation of partial melting equilibria in metabasic rocks",

abstract = "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 ≤13 kbar.",

keywords = "Amphibolite, Calibration, Granulite, Holland & Powell dataset, Pseudosection",

author = "Green, {E. C. R.} and White, {R. W.} and Diener, {J. F. A.} and R. Powell and Holland, {T. J. B.} and Palin, {R. M.}",

note = "This work was supported by DFG grant WH 110/4-1 awarded to R. W. White.",

year = "2016",

month = nov,

day = "6",

doi = "10.1111/jmg.12211",

language = "English",

volume = "34",

pages = "845--869",

journal = "Journal of Metamorphic Geology",

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publisher = "John Wiley & Sons, Ltd",

number = "9",

}

TY - JOUR

T1 - Activity-composition relations for the calculation of partial melting equilibria in metabasic rocks

AU - Green, E. C. R.

AU - White, R. W.

AU - Diener, J. F. A.

AU - Powell, R.

AU - Holland, T. J. B.

AU - Palin, R. M.

N1 - This work was supported by DFG grant WH 110/4-1 awarded to R. W. White.

PY - 2016/11/6

Y1 - 2016/11/6

N2 - 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 ≤13 kbar.

AB - 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 ≤13 kbar.

KW - Amphibolite

KW - Calibration

KW - Granulite

KW - Holland & Powell dataset

KW - Pseudosection

U2 - 10.1111/jmg.12211

DO - 10.1111/jmg.12211

M3 - Article

SN - 0263-4929

VL - 34

SP - 845

EP - 869

JO - Journal of Metamorphic Geology

JF - Journal of Metamorphic Geology

IS - 9

ER -

Activity-composition relations for the calculation of partial melting equilibria in metabasic rocks

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Keywords

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