MINERAL CHEMISTRY AND P-T ESTIMATION OF FORMATION OF CUMMINGTONITE AND COEXISTING MINERALS IN THE CALC-SILICATE ROCKS FROM THE TAKHT-E-SOLEYMAN AREA, NW IRAN

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HAJI ALI OUGHLI R.; MOAZEN M.; JAHANGIRI AHMAD; DROOP G.T.R.; BOUSQUET R.

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2008 | Volume:16 | Issue:2 Page(s): 175-188

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Title

MINERAL CHEMISTRY AND P-T ESTIMATION OF FORMATION OF CUMMINGTONITE AND COEXISTING MINERALS IN THE CALC-SILICATE ROCKS FROM THE TAKHT-E-SOLEYMAN AREA, NW IRAN

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Keywords

TAKKHT-E-SOLEYMAN AREAQ2

RETROGRADE METAMORPHISMQ3

CALC-SILICATESQ3

CUMMINGTONITEQ2

P-T CONDITIONSQ3

Abstract

The calcareous rocks in the Takht-e-Soleyman area (NW Iran) crop out in association with a variety of metamorphic rocks including amphibolites, granitic gneisses, pelitic schists and meta-ultramafic rocks. Retrogressive metamorphism of these rocks occurred during decompressional cooling during exhumation. CUMMINGTONITE-bearing rocks resulted from retrogression of the CALC-SILICATES in the area. Their dominant mineral assemblage is plagioclase+garnet+calcic–amphibole+ferromagnesian–amphibole+quartz+calcite±titanite±epidote. Calcic-and ferromagnesian-amphiboles were determined by petrographical observations and EMPA analysis. Hornblende and CUMMINGTONITE compositions dominate the analysed amphiboles. Formation of Ca-poor CUMMINGTONITE coexisting with calcite and calcic-hornblende in the retrograde CALC-SILICATES of the Takht-e-Soleyman area is a rare petrological occurrence. Thermometric estimates using mineral compositions of CUMMINGTONITE co-existing with hornblende is in the range of 550-600oC. Al in hornblende barometry yields a pressure of 6.5±0.6 kbar, corresponding to medium pressure amphibolite facies.

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APA: Copy

HAJI ALI OUGHLI, R., MOAZEN, M., JAHANGIRI, AHMAD, DROOP, G.T.R., & BOUSQUET, R.. (2008). MINERAL CHEMISTRY AND P-T ESTIMATION OF FORMATION OF CUMMINGTONITE AND COEXISTING MINERALS IN THE CALC-SILICATE ROCKS FROM THE TAKHT-E-SOLEYMAN AREA, NW IRAN. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 16(2), 175-188. SID. https://sid.ir/paper/4230/en

Vancouver: Copy

HAJI ALI OUGHLI R., MOAZEN M., JAHANGIRI AHMAD, DROOP G.T.R., BOUSQUET R.. MINERAL CHEMISTRY AND P-T ESTIMATION OF FORMATION OF CUMMINGTONITE AND COEXISTING MINERALS IN THE CALC-SILICATE ROCKS FROM THE TAKHT-E-SOLEYMAN AREA, NW IRAN. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2008;16(2):175-188. Available from: https://sid.ir/paper/4230/en

IEEE: Copy

R. HAJI ALI OUGHLI, M. MOAZEN, AHMAD JAHANGIRI, G.T.R. DROOP, and R. BOUSQUET, “MINERAL CHEMISTRY AND P-T ESTIMATION OF FORMATION OF CUMMINGTONITE AND COEXISTING MINERALS IN THE CALC-SILICATE ROCKS FROM THE TAKHT-E-SOLEYMAN AREA, NW IRAN,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 16, no. 2, pp. 175–188, 2008, [Online]. Available: https://sid.ir/paper/4230/en

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