Tracing high-pressure metamorphism in marbles: Phase relations in high-grade aluminous calcite-dolomite marbles from the Greek Rhodope massif in the system CaO-MgO-Al2O3-SiO2-CO2 and indications of prior aragonite

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Author list: Proyer A, Mposkos E, Bazicitis I, Hoinkes G

Publisher: Elsevier

Place: AMSTERDAM

Publication year: 2008

Journal: Lithos (0024-4937)

Journal acronym: LITHOS

Volume number: 104

Issue number: 1-4

Start page: 119

End page: 130

Number of pages: 12

ISSN: 0024-4937

Languages: English-Great Britain (EN-GB)

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Abstract

Four different types of parageneses of the minerals calcite, dolomite, diopside, forsterite, spinel, amphibole (pargasite), (Ti-)clinohumite and phlogopite were observed in calcite-dolomite marbles collected in the Kimi-Complex of the Rhodope Metamorphic Province (RMP). The presence of former aragonite can be inferred front carbonate inclusions, which, in combination with an analysis of phase relations in the simplified system CaO-MgO-Al2O3-SiO2-CO2 (CMAS-CO2) show that the mineral assemblages preserved in these marbles most likely equilibrated at the aragonite-calcite transition, slightly below the coesite stability field, at ca. 720 degrees C, 25 kbar and a(CO2)similar to 0.01. The thermodynamic model predicts that no matter what activity of CO2, garnet has to be present in aluminous calcite-dolomite-marble at UHP conditions. (C) 2007 Elsevier B.V. All rights reserved.

Keywords

aragonite, calcite-dolomite-marble, garnet, petrogenetic grid, spinel, ultrahigh-pressure

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