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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
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1945-3027
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Volume 102, Issue 1

Issues

Dissolving dolomite in a stable UHP mineral assemblage: Evidence from Cal-Dol marbles of the Dora-Maira Massif (Italian Western Alps)

Simona Ferrando
  • Corresponding author
  • Department of Earth Sciences, University of Torino, Via Valperga Caluso 35, I-10125 Torino, Italy
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  • Other articles by this author:
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/ Chiara Groppo
  • Department of Earth Sciences, University of Torino, Via Valperga Caluso 35, I-10125 Torino, Italy
  • IGG-CNR, Via Valperga Caluso 35, I-10125 Torino, Italy
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Maria Luce Frezzotti
  • Department of Earth and Environmental Sciences, University of Milano Bicocca, Piazza della Scienza 4, I-20126 Milano, Italy
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  • De Gruyter OnlineGoogle Scholar
/ Daniele Castelli
  • Department of Earth Sciences, University of Torino, Via Valperga Caluso 35, I-10125 Torino, Italy
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/ Alexander Proyer
Published Online: 2017-01-03 | DOI: https://doi.org/10.2138/am-2017-5761

Abstract

In deep and cold subduction such as that experienced by the UHP Units of the Western Alps, carbon dissolution is a relevant mechanism for carbon transfer from the slab into the mantle. The UHP impure Cal-Dol-marbles from the Dora-Maira Massif are studied to investigate the poorly known evolution of dolomite during deep subduction. Dolomite shows four stages of growth, from pre-Alpine to early-retrograde Alpine, coupled with chemical variations and distinct included mineral assemblages. To explain the evidence for growth and partial reabsorption of dolomite through HP prograde, UHP peak, and UHP early-retrograde Alpine metamorphism, a chemically simple marble (Cal, Dol, Di, Fo, and retrograde Atg, Tr, Mg-Chl) has been studied in detail. Microstructural relationships, coupled with mineral chemistry, indicate the growth of the assemblage dolomite+diopside+forsterite±aragonite during HP prograde, UHP peak, and UHP early-retrograde evolution.

Mixed-volatile P-T projection modeled in the simple CaO-(FeO)-MgO-SiO2-H2O-CO2 system and T-P-XCO2 petrogenetic grids and pseudosections predict the prograde (1.7 GPa, 560 °C) growth of dolomite in equilibrium with diopside and forsterite through the breakdown of antigorite+aragonite. In a H2O-CO2-saturated system, the subsequent HP-UHP evolution is predicted in the Di+Fo+Dol+Arg stability field in equilibrium with a dominantly aqueous COH fluid [0.0003 < XCO2 < 0.0008], whose composition is internally buffered by the equilibrium assemblage. Thermodynamic modeling indicates that neither the consumption nor the growth of new dolomite generations at UHP conditions can have been induced by metamorphic reactions. The abundant primary H2O+Cal+Dol+Cl-rich Tr+Cl-rich Tlc±chloride fluid inclusions present in UHP Cpx indicate that a dominantly aqueous, saline (salinity >26.3 wt% of NaCleq) COH fluid, containing Ca, Mg, and Si as dissolved cations was present during the growth of the UHP assemblage Dol+Cpx+Ol+Arg.

The complex zoning of dolomite is therefore interpreted as due to protracted episodes of dissolution and precipitation in saline aqueous fluids at HP/UHP conditions. Kinetics of dolomite dissolution in aqueous fluids is poorly known, and experimental and thermodynamic data under HP conditions are still lacking. Data on calcite indicate that dissolution at HP is enhanced by a prograde increase in both P and T, by high salinity in aqueous fluids, and/or low-pH conditions. In the studied marble, the P-T path and the occurrence of free high-saline fluids represent favorable conditions: (1) for the inferred dissolution-precipitation processes of the stable dolomite in a closed system, and (2) for possible migration of the dissolved carbonate, if the system would have been open during subduction.

Keywords: Subduction; zoned dolomite; cathodoluminescence; micro-Raman spectroscopy; thermodynamic modeling; COH fluid; dissolution-precipitation; Invited Centennial article

Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html.

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About the article

Received: 2016-03-09

Accepted: 2016-07-25

Published Online: 2017-01-03

Published in Print: 2017-01-01


Citation Information: American Mineralogist, Volume 102, Issue 1, Pages 42–60, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2017-5761.

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© 2017 by Walter de Gruyter Berlin/Boston.

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