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An experimental investigation of antigorite dehydration in natural silica-enriched serpentinite

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Abstract

Piston cylinder experiments were performed to constrain the pressure and temperature conditions for two high-pressure antigorite dehydration reactions found in silica-enriched serpentinites from Cerro del Almirez (Nevado–Filábride Complex, Betic Cordillera, southern Spain). At 630–660°C and pressures greater than 1.6 GPa, antigorite first reacts with talc to form orthopyroxene ± chlorite + fluid. We show that orthopyroxene + antigorite is restricted to high-pressure metamorphism of silica-enriched serpentinite. This uncommon assemblage is helpful in constraining metamorphic conditions in cold subduction environments, where antigorite serpentinites have no diagnostic assemblages over a large pressure and temperature range. The second dehydration reaction leads to the breakdown of antigorite to olivine + orthopyroxene + chlorite + fluid. The maximum stability of antigorite is found at 680°C at 1.9 GPa, which also corresponds to the maximum pressure limit for tremolite coexisting with olivine + orthopyroxene. The high aluminium (3.70 wt% Al2O3) and chromium contents (0.59 wt% Cr2O3) of antigorite in the investigated starting material is responsible for the expansion of the serpentinite stability to 60–70°C higher temperatures at 1.8 GPa than the antigorite stability calculated in the Al-free system. The antigorite from our study has the highest Al–Cr contents among all experimental studies and therefore likely constraints the maximum stability of antigorite in natural systems. Comparison of experimental results with olivine–orthopyroxene–chlorite–tremolite assemblages outcropping in Cerro del Almirez indicates that peak metamorphic conditions were 680–710°C and 1.6–1.9 GPa.

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Acknowledgments

Three anonymous reviewers are thanked for their insightful and helpful reviews. We thank D. Scott, W.O. Hibberson and D. Clark for their technical support in the running of the high-pressure experiments at the RSES (ANU) and Frank Brink for his technical assistance in the Electron Microscopy Unit (ANU). We also thank Prof. Marcello Mellini for his comments on an early draft of the paper. This work was supported by the Spanish “Ministerio de Ciencia e Innovación (MICINN)” through research grants CGL2006-04440, CGL2007-61205/BTE, and ACI2006-A9-0580, the Spanish Council for Research (CSIC) through grant 2008-30I014, and by the “Junta de Andalucía” research groups RNM-145 and RNM-131. J.A. Padrón-Navarta1 is supported by fellowship AP2005-060 from the “Programa de Formación del Profesorado Universitario”. J. Hermann acknowledges financial support by the Australian Research Council. We are grateful for the editorial help and support provided by J. Hoefs.

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Authors and Affiliations

  1. Departamento de Mineralogía y Petrología, Facultad de Ciencias, Universidad de Granada, Avda Fuentenueva s/n, 18002, Granada, Spain

    José Alberto Padrón-Navarta

  2. Research School of Earth Sciences, The Australian National University, Canberra, 0200, ACT, Australia

    Jörg Hermann

  3. Instituto Andaluz de Ciencias de la Tierra (IACT), CSIC & UGR, 18002, Granada, Spain

    Carlos J. Garrido

  4. Departamento de Geología, Escuela Politécnica Superior, Universidad de Jaén, Alfonso X El Sabio 28, 23700, Linares, Spain

    Vicente López Sánchez-Vizcaíno

  5. Departamento de Mineralogía y Petrología, Facultad de Ciencias, Instituto Andaluz de Ciencias de la Tierra, Universidad de Granada - CSIC, 18002, Granada, Spain

    María Teresa Gómez-Pugnaire

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  1. José Alberto Padrón-Navarta
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Correspondence to José Alberto Padrón-Navarta.

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Padrón-Navarta, J.A., Hermann, J., Garrido, C.J. et al. An experimental investigation of antigorite dehydration in natural silica-enriched serpentinite. Contrib Mineral Petrol 159, 25–42 (2010). https://doi.org/10.1007/s00410-009-0414-5

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