Mineral Chemistry and Crystallization Pressure and Temperature of the Quartz-Diorites from the Takht-e-Soleyman Area, NW Iran

Hajialioghli, R.; Jahangiri, A.; Moazzen, M.; Droop, G.T.R.; Bousquet, R.

doi:10.22071/gsj.2010.57159

Document Type : Original Research Paper

Authors

¹ Department of Geology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran

² School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, British U. K.

³ Institut für Geowissenschaften, Universität Potsdam, Potsdam, Germany

https://doi.org/10.22071/gsj.2010.57159

Abstract

The igneous rocks of Takht-e-Soleyman area in the north western Iran crop out in association with the amphibolites. The contact between igneous rocks and amphibolites is sharp. Igneous rocks in the study area are mainly granodiorite, quartz-monzodiorite and quartz-diorite. Plagioclase and hornblende form dominant minerals of the igneous rocks. Titanite and epidote occur in rare amounts. Chemical compositions of the clinopyroxene, plagioclase, hornblende and titanite in quartz-diorites were analysed using EPMA.
High Mg and Si contents accompanied by low Ti at the rim composition of the analysed amphiboles can be attributed to subsolidus cooling event. Magmatic crystallisation temperature for quartz-diorites is determined based on compositions of hornblende and coexisting plagioclase. Clinopyroxene composition was used to estimate crystallization pressure of the investigated rocks in the Takab area. Estimated temperature and pressure are consistent with 820±75^oC and 8 kbar, respectively. Thermometry based on Ti content of the analysed hornblende gives temperature of 760^oC. On the basis of chemical compositions of the analysed clinopyroxenes, sub-alkaline and I-type natures of the quartz-diorites in the study area can be concluded.

Keywords

20.1001.1.10237429.1388.18.72.18.6

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Scientific Quarterly Journal of Geosciences

Mineral Chemistry and Crystallization Pressure and Temperature of the Quartz-Diorites from the Takht-e-Soleyman Area, NW Iran

References

References

Volume 18, Issue 72 - Serial Number 72
January 2009
Pages 139-144

Mineral Chemistry and Crystallization Pressure and Temperature of the Quartz-Diorites from the Takht-e-Soleyman Area, NW Iran

References

References

Volume 18, Issue 72 - Serial Number 72January 2009Pages 139-144

Volume 18, Issue 72 - Serial Number 72
January 2009
Pages 139-144