Equilibrium state of diopside-bearing harzburgites from ophiolites: Geobarometric and geodynamic implications View Full Text


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Article Info

DATE

1984-12

AUTHORS

Jean -Claude C. Mercier, Vincent Benoit, Jacques Girardeau

ABSTRACT

The bulk compositions of coexisting enstatite and diopside in basal lherzolites and clinopyroxene-bearing harzburgites from ophiolitic complexes are typical of solidus/subsolidus equilibria, but for a few texturally distinct “magmatic” diopsides. They would presumably reflect the state of equilibrium at the time they last coexisted with liquid as the rocks reentered subsolidus conditions. The total lack of correlation between Al and Ca concentrations shows that the compositional scatter observed for any given massif, results from analytical errors related to extensive exsolution and serpentinization, rather than from differences in equilibrium conditions. However, significant differences are found between the residual ophiolitic lherzolites from Hare Bay, Newfoundland, and from Xigaze, Tibet, two massifs selected for their distinct structural and textural features. As for thermobarometry techniques relevant to these rocks, the best barometer found is an empirical relation for the expression of pressure as a virtually temperature-independent function of the ratioKf=(XDiopx)/(1 −XDicpx), in agreement with semi-quantitative models based on natural solid solutions. Temperatures are then simply derived from a surface-fitting expression relating pressure, temperature and diopside-solvus compositions, according to a regularXEncpx solution model (CMS) corrected for the effect of Al in the spinel facies. Application of these techniques yield pressures of 0.4 and 1.4 GPa, i.e. depths from sea-bottom of about 13 and 43 km, for temperatures of 1,170 and 1,300° C for the ophiolitic lherzolites of Tibet and New-foundland, respectively, in good agreement with dry-solidus data by radioactive tracing and with geothermal-model estimates for ridges. More... »

PAGES

391-403

References to SciGraph publications

  • 1983-03. Evaluation of olivine-spinel geothermometry as an indicator of thermal history for peridotites in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1979-08. Thermodynamic parameters of CaMgSi2O6-Mg2Si2O6 pyroxenes based on regular solution and cooperative disordering models in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1975-07. Thermal model of oceanic lithosphere in NATURE
  • 1981. The Thermodynamics of the Mg2Si2O6-CaMgSi2O6 Join: A Review and an Improved Model in THERMODYNAMICS OF MINERALS AND MELTS
  • 1982-08. (Ca,Mg)2Si2O6 clinopyroxenes: A solution model based on nonconvergent site-disorder in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1979-12. Experimental determination of the spinel peridotite to garnet peridotite inversion at 900° C and 1,000° C in the system CaO-MgO-Al2O3-SiO2, and at 900° C with natural garnet and olivine in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1981-12. The Xigaze ophiolite (Tibet): a peculiar oceanic lithosphere in NATURE
  • 1973-06. Garnet-orthopyroxene and orthopyroxene-clinopyroxene relationships in simple and complex systems in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1981-09. The compositions of coexisting pyroxenes and garnet in the system CaO-MgO-Al2O3-SiO2 at 900°–1,100°C and high pressures in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1975-09. Enstatite-diopside solvus and geothermometry in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1981-10. The Al2O3 contents of enstatite in equilibrium with garnet in the system MgO-Al2O3-SiO2 at 15–40 kbar and 900°–1,600° C in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
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    http://scigraph.springernature.com/pub.10.1007/bf01150295

    DOI

    http://dx.doi.org/10.1007/bf01150295

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    37 schema:description The bulk compositions of coexisting enstatite and diopside in basal lherzolites and clinopyroxene-bearing harzburgites from ophiolitic complexes are typical of solidus/subsolidus equilibria, but for a few texturally distinct “magmatic” diopsides. They would presumably reflect the state of equilibrium at the time they last coexisted with liquid as the rocks reentered subsolidus conditions. The total lack of correlation between Al and Ca concentrations shows that the compositional scatter observed for any given massif, results from analytical errors related to extensive exsolution and serpentinization, rather than from differences in equilibrium conditions. However, significant differences are found between the residual ophiolitic lherzolites from Hare Bay, Newfoundland, and from Xigaze, Tibet, two massifs selected for their distinct structural and textural features. As for thermobarometry techniques relevant to these rocks, the best barometer found is an empirical relation for the expression of pressure as a virtually temperature-independent function of the ratioKf=(XDiopx)/(1 −XDicpx), in agreement with semi-quantitative models based on natural solid solutions. Temperatures are then simply derived from a surface-fitting expression relating pressure, temperature and diopside-solvus compositions, according to a regularXEncpx solution model (CMS) corrected for the effect of Al in the spinel facies. Application of these techniques yield pressures of 0.4 and 1.4 GPa, i.e. depths from sea-bottom of about 13 and 43 km, for temperatures of 1,170 and 1,300° C for the ophiolitic lherzolites of Tibet and New-foundland, respectively, in good agreement with dry-solidus data by radioactive tracing and with geothermal-model estimates for ridges.
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