Abstract
The metapelitic schists of Jandagh or simply Jandagh metapelites can be divided into four groups based on mineral assemblages: (1) quartz-muscovite schists, (2) quartz-muscovite-biotite schists, (3) garnet-muscovite-chlorite schists, and (4) garnet-muscovite-staurolite schists. The Jandagh garnet-muscovite-chlorite schists show the first appearance of garnets. These garnets contain 58–76% almandine, 1–18% spessartine, and 8–20% grossular. Microprobe analysing across the garnets demonstrates an increase in Mg# from core to rim. This is a feature of the prograde metamorphism of metapelites. Well-preserved garnet growth zoning is a sign that metapelites were rapidly cooled and later metamorphic phases had no effect here. The appearance of staurolite in garnet-muscovite-chlorite schists signifies a beginning of the amphibolite facies. The absence of zoning in staurolite suggests that its formation and growth during prograde metamorphism occurred at a widely spaced isograde. Thermobarometric investigations show that the Jandagh metapelites were formed within a temperature range of 400–670°C and pressures of 2.0–6.5 kbar. These results are in agreement with the mineral paragenetic evidence and show the development of greenschist and amphibolite facies in the area studied.
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References
K. Bucher and M. Frey, Petrogenesis of Metamorphic Rocks (Springer-Verlag, Berlin-Heidelberg, New York, 2002).
A. Ganser, “New Aspects of Geology in Central Iran (With Discussion),” in 4th World Petrol. Congress, Section 1, (1955), pp. 278–300.
M. Hatef, Geology and Petrology of Igneous and Metamorphic Rocks in Khur-Jandagh Region (Central Iran) (Isfahan University, 1996).
F. B. Masoudi, B. Mehrabim, and Sh. Mahmoudi, “Garnet (Almandine-Spessartine) Growth Zoning and Its Application To Constrain Metamorphic History in Dehsalm Complex, Iran,” J. Sci. I.R. Iran 17(3), 235–244 (2006).
L. L. Perchuk, “Derivation of Thermodynamically Consistent System of Geothermometers and Geobarometers for Metamorphic and Magmatic Rocks,” in Progress in Metamorphic and Magmatic Petrology (University Press, Cambridge, 1990), pp. 93–112.
L. L. Perchuk, Yu. Yu. Podladchikov, and A. N. Polaykov, “PT-Paths and Geodynamic Modeling of Some Metamorphic Processes,” J. Metamorph. Geol. 10, 311–319 (1992).
L. L. Perchuk, D. D. van Reenen, C. A. Smith, et al., “Isobaric Heating Recorded in Polymetamorphic Rocks from the Central Zone of the Limpopo High-Grade Terrain, South Africa,” Lithos 103, 70–105 (2008).
E. Romanko, Y. U. Kokorin, B. Krivyakin, et al., Outline of Metallogeny of Anarak Area (Central Iran), Ministry of Mines and Metals, (Geol. Surv. Iran-V/O Technoexport, 1984).
A. F. Stah and von Zur, “Geologie Von Persian Geognostische Beschreibung Des Nordlichen Und Zentral-Persiens,” Petermanns Mitt., No. 122, 1–72 (1897).
J. Stöklin, “Structural History and Tectonics of Iran,” Rev. Amer. Assoc. Petrol. Geol. B52(7), 1229–1258 (1968).
S. M. Tabatabaei manesh, Petrology of Polymetamorphic Rocks in the Central zone of the Limpopo High-Grade Terrain, South Africa (State University, Moscow, 2006).
Technoexport, Geology of Jandagh Area (Central Iran), Geol. Surv. Iran, V/O Technnoexport, Report TE/NO 4 (1974).
B. W. D. Yardley, An Introduction To Metamorphic Petrology (Longman Scientific & Technical, Singapore, 1990).
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Tabatabaei Manesh, S.M., Sharifi, M. & Romanko, A. P-T conditions of the Jandagh metapelitic schists, Northeastern Isfahan Province, Iran. Petrology 18, 308–317 (2010). https://doi.org/10.1134/S0869591110030069
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DOI: https://doi.org/10.1134/S0869591110030069