High-pressure and high-temperature experiments on the phase relations in the system of Mg-rich garnet composition (Prp75Alm25): Implication for the Fe-Mg partitioning between garnet and orthopyroxene

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概要

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• The phase lelations in the system of Mg-rich garnet composition (P_1p_<75>Alm_<25>) were investigated using a piston cylinder appaiatus at 11-23 kbai and 1000-1300℃ The following mineral assemblages were obtained with decieasing pressure at 1200℃ garnet, garnet + oithopyroxene + sapphinne + quartz, orthopyroxene + sapphmne + quartz At 11 kbar the assemblage of orthopyioxene + sapphirine + quartz changed to that of orthopyroxene + sapphirine + quartz + sillimanite at a certain temperatuie between 1000 and 1100℃ The Fe-Mg distribution coefficients of coexisting garnet and orthopyioxene K_D = (X_<Mg>/X_<〓〓>)^<0p〓>(X_<〓〓>/X_<Mg>)^<cnt> was experimentally determined The new gamet-oithopyroxene geothermometet has been obtained as 7(℃) = (2387±146)/[1nK_D + (1 20±0 10)]-273 We estimated the retrogiade metamoiphic temperatures of UHT metamorphic rocks from Enderby Land East Antaictica as 812-1010℃ Our estimations matched with previous estimations based on Fe-Mg exchange and were about 200-300℃ lowei than those of previous estimations based on feldspai theimometry

• 国立極地研究所の論文

著者

• Sato Kei

  Division of Earth Sciences, Department of Biosphere-Geosphere Sciences, Ehime University

• Kawasaki Toshisuke

  Division Of Earth Sciences Department Of Biosphere-geosphere Sciences Faculty Of Science Ehime Unive

• Kawasaki Toshisuke

  Division Of Earth Sciences Department Of Biosphere And Geosphere Sciences Faculty Of Science Ehime U

• Sato Kei

  Division Of Earth Sciences Department Of Biosphere-geosphere Sciences Faculty Of Science Ehime Unive

• Sato Kei

  Division Of Earth Sciences Department Of Biosphere-geosphere Sciences Ehime University

関連論文

• Occurrences of metamorphosed ultramafic rock and associating rocks in Howard Hills, Enderby Land, East Antarctica: Evidence of partial melting from geochemical and isotopic characteristics
• Experimental constraints of metamorphic pressure and temperature, and phase relations of a phlogopite-bearing orthopyroxene granulite from Howard Hills, Napier Complex, East Antarctica
• High-pressure and high-temperature phase relations of an orthopyroxene granulite from McIntyre Island, Enderby Land, East Antarctica
• AN EXPERIMENTAL STUDY OF Fe-Mg PARTITIONINGS BETWEEN ORTHOPYROXENE AND CORDIERITE IN THE Mg-RICH PORTION OF THE Mg_3Al_2Si_3O_-Fe_3Al_2Si_3O_ SYSTEM AT ATMOSPHERIC PRESSURE : CALIBRATION OF ITS GEOTHERMOMETRY FOR HIGH-TEMPERATURE GRANULITES AND IG
• High-pressure and high-temperature experiments on the phase relations in the system of Mg-rich garnet composition (Prp75Alm25): Implication for the Fe-Mg partitioning between garnet and orthopyroxene
• Effects of Pressure and Ca^ on the Fe-Mg Partitioning between Olivine and Clinopyroxene
• Thermodynamic formulations of (Ca, Fe, Mg)_2SiO_4 olivine
• Thermodynamic analysis of partitioning of Ca, Fe and Mg between olivine and clinopyroxene

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