Synthesis of pyrope - grossular garnets: an experimental study at P=2.5 GPa (Articolo in rivista)

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  • Synthesis of pyrope - grossular garnets: an experimental study at P=2.5 GPa (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • Andrea Orlando, Daniele Borrini (2003)
    Synthesis of pyrope - grossular garnets: an experimental study at P=2.5 GPa
    in Mineralogy and petrology
    (literal)
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  • Andrea Orlando, Daniele Borrini (literal)
Pagina inizio
  • 37 (literal)
Pagina fine
  • 51 (literal)
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  • The paper is part of a project denominated \"Materiali terrestri ed analoghi sintetici ad alta pressione ed alta temperatura: proprieta' fisiche, chimiche e reologiche\" supported by Italian MURST through “Cofin 1998” (national coordinator C.A. Ricci). (literal)
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  • 78 (literal)
Rivista
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  • impact factor 1,086 (literal)
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  • Among the problems relating to petrological equilibrium in mafic and ultramafic rocks, the high pressure study of the pyrope (py, Mg3Al2Si3O12) - grossular (gr, Ca3Al2Si3O12) join of garnet (a key mineral in the thermobarometry of high pressure rocks) is crucial; in fact the join pertains to the CMAS (CaO-MgO-Al2O3-SiO2) system which is very important in order to model partial melting processes within the mantle. This study was performed on both synthetic and natural starting materials utilising a piston-cylinder apparatus to perform experiments and the electron microprobe to analyse the run products. The data obtained clearly reveal that at P=2.5 GPa and T>=1100°C, mixed pyrope - grossular garnets are stable only for end-members rich compositions, the extent of solid solution between grossular and pyrope appearing to be greater on the Mg-rich side in accordance with the experimental data obtained at 3 GPa. Clinopyroxene with a composition lying on the diopside (CaMgSi2O6) – Ca Tschermak (CaAlAlSiO6) join is a stable phase at all the intermediate compositions. Doping of synthetic starting materials with Na or Cr does not change noticeably the solubility among the 2 garnet end-members but it rather stabilises exotic phases such as melilite and merwinite. In summary, the results of this work suggest that is unlikely that mixed garnets between py10gr90 and py85gr15 are stable in natural systems equilibrated at P <=3 GPa and T>=1100°C. (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • 1 C.N.R.- Istituto di Geoscienze e Georisorse, Sezione di Firenze, via G. La Pira, 4 - 50121 Firenze 2 Dipartimento di Scienze della Terra, Università degli Studi di Firenze, via G. La Pira, 4 - 50121 Firenze (literal)
Titolo
  • Synthesis of pyrope - grossular garnets: an experimental study at P=2.5 GPa (literal)
Abstract
  • In order to evaluate the stability of Mg-Ca garnets at P=2.5 GPa / T=800 – 1500°C, some experiments were performed using both natural and synthetic starting materials. Particular attention was paid to the investigation of the Ca rich side of the pyrope – grossular join and the maximum pyrope content in grossular was found to be about 10 mol.%. The addition of Cr to the system only slightly increases the observed pyrope solubility in grossular whereas Na stabilises melilite and merwinite. Clinopyroxene with a composition lying on the diopside – Ca Tschermak join appears to be the only stable crystalline phase in the middle part of the pyrope – grossular join. (literal)
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