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Zare Shooli M, Tahmasbi Z, Saki A, Ahmadi Khalaji A. Mineral chemistry, pressure-temperature determination and fluids activities in Boroujerd migmatites using cordierite mineral. www.ijcm.ir 2019; 27 (1) :135-150
URL: http://ijcm.ir/article-1-1231-en.html
2- M. 1, Z. 1, A. 2, A. 1
Abstract:   (2603 Views)
The intrusion of Boroujerd Granitoid Complex into the metamorphosed pelitic rocks has resulted in the formation of pelitic hornfelses and anatectic migmatites in its metamorphic aureole. The effective melting reactions include fluid-present and fluid-absent. Fluid-present melting reactions may have consumed the whole free fluid in the aureole as a result of which melting process continued through fluid-absent reactions. It is highly probable that high-grade mineral assemblages like spinel+corundum in the aureole have formed by biotite dehydration reactions. As a result, the presence of spinel and corundum minerals in these rocks is related to the fluid-absent partial melting. Using thermodynamic equilibrium of minerals and multiple equilibrium reactions, peak pressure and temperature of metamorphism are estimated as 4 kbar and 750 °C respectively. The total fluid activity in melanosome cordierites (a CO2 [0.15] + a H2O [0.6]) is 0.75 at the aforementioned pressure and temperature. Melt-water content in Boroujerd migmatites is 3.75 % and H2O content of cordierite in melanosomes is 1.1 %. Considering these numbers, the Dw of melt reactions at 750 °C for Boroujerd migmatites is 3.41 % that correlates with biotite dehydration reactions. The H2O content of melts matches the minimum water line which is representative of fluid-absent conditions and confirms the correctness of petrographical studies, fluid-absent reactions and the estimated Dw in migmatites.
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1. [1] Vernon R. H., "A Practical Guide to rock Microstructure", Cambridge University Press (2004). [DOI:10.1017/CBO9780511807206]
2. [2] Vernon R. H., Clark G. l., "Principles of metramorphic Petrology", Cambridge University Press (2008).
3. [3] Harley S. L., Thompson P., Hensen B. J., Buick I. S., "Cordierite as a sensor of fluid conditions in high-grade metamorphism and crustal anataxis", Journal of Metamorphic Geology 20 (2002) 71-86. [DOI:10.1046/j.0263-4929.2001.00344.x]
4. [4] Kalt A., "Cordierite channel volatiles as evidence for dehydration melting: an example from high-temperature metapelites of the Bayerische Wald (Variscan belt, German)", European Journal of Mineralogy 12 (2000) 987–998. [DOI:10.1127/ejm/12/5/0987]
5. [5] Kolesov B. A., Geiger C. A., "Cordierite II: The role of CO2 and H2O", American Mineralogist 85 (2000) 1265–1274. [DOI:10.2138/am-2000-8-919]
6. [6] Moazzen M., Droop G. T. R., Harte B., "Abrupt transition in H2O activity in the melt-present zone of a thermal aureole: evidence from H2O contents of cordierites", Geology 29 (2001) 311–314. https://doi.org/10.1130/0091-7613(2001)029<0311:ATIHOA>2.0.CO;2 [DOI:10.1130/0091-7613(2001)0292.0.CO;2]
7. [7] Rigby M. J., "Cordierite as a Monitor of Volatile Content during Metamorphism and Partial Melting", PhD Thesis, University of Manchester, Manchester.
8. [8] Rigby M. J., DROOP G. T. R., Bromiley G. D., "Variations in fluid activity across the Etive thermal aureole, Scotland: evidence from cordierite volatile contents", Journal of metamorphic Geology 26 (2008) 331–346. [DOI:10.1111/j.1525-1314.2007.00752.x]
9. [9] Berthier F., Billiaul H.P., Halbrorom B., Marizot P., "Tude Stratigraphique, Petrologiqueet structural de La region de Khorramabad (Zagros, Iran)", These De 3e Cycle, Grenoble, France (1974) pp. 282.
10. [10] Masoudi F., "Contact metamorphism and pegmatite development in the region SW of Arak, Iran", PhD thesis, Leeds University, UK (1997).
11. [11] Heydarianmanesh A., Tahmasebi Z., Ahmadi- Khalaji A., "Mineral chemistry and thermobarometry of migmatitic rocks of Boroujerd area (north of Sanandaj-Sirjan zone) (in Persian)", Petrology 25 (2016) 117-138.
12. [12] Tahmasbi Z., "The role of garnet in interpretation of petrogeneses granitoid Boroujerd complex and its metamorphic areoule (in Persian)", Irainan Journal of crystallography and mineralogy 21 (2013) 57-70.
13. [13] Mohajjel M., "Structure and tectonic evolution of Paleozoic-Mesozoic rocks, Sanandaj-Sirjan zone, Western Iran", Ph.D. Thesis, University of Wollongong, Australia (1997).
14. [14] Mohajjel M., Fergusson C.L., Sahandi M.R., "Cretaceous-Tertiary convergence and continental collision, Sanandaj-Sirjan zone, Western Iran", Journal of Asian Earth Sciences 21 (2003) 379-412. [DOI:10.1016/S1367-9120(02)00035-4]
15. [15] Stoklin J., "Structural histiry and tectonics of Iran, A review", American Association Petroleum Geologists 52 (1968) 1229-1258.
16. [16] Ahmadi-Khalaji A., Esmaeily D., Valizadeh M. V., Rahimpour-Bonab H., "Petrology and Geochemistry of the Granitoid Complex of Boroujerd, Sansandaj-Sirjan Zone, Western Iran", Journal of Asian Earth Sciences, 29 (2007) 859-877 [DOI:10.1016/j.jseaes.2006.06.005]
17. [17] Masoudi F., Yardley B.W.D., Cliff R.A., "Rb-Sr geochronology of pematites, plutonic rocks and a hornfels in the region southwest of Arak, Iran", Journal of Sciences 13 (2002) 249-254.
18. [18] Ahmadi-Khalaji A., Tahmasbi Z., Keshtgar Sh., "A new view on the metamorphic rocks of the Boroujerd area (in Persian) ", Journal of Geotechnical Geology 2 (2010) 71-81.
19. [19] Clemens J. D., Wall V. J., "Crystallisation and origin of some peraluminous (S-type) granitic magmas", Cantributions to Mineralogy and Petrology 14 (1981) 111-132.
20. [20] Clemens J. D. and Vielzeuf D., "Constraints on melting and magma production in the crust", Earth and Planetary Science Letters, 86 (1987) 287-306. [DOI:10.1016/0012-821X(87)90227-5]
21. [21] Pati-o Douce A. E., Johnstone A. D., "Phase equilibria and melt productivity in the pelitic system: implications for the origin of peraluminous granitoids and aluminous granites", Contributions to Mineralogy and Petrology 107 (1991) 202-218. [DOI:10.1007/BF00310707]
22. [22] Stevens G., Clemens J. D., Droop G. T. R., "Melt production during granulite-facies anatexis: experimental data from "primitive" metasedimentary protoliths", Contributions to Mineralogy and Petrology 28 (1997) 352-370. [DOI:10.1007/s004100050314]
23. [23] Vielzeuf D., Hollowa, J. R., "Experimental determination of the fluid- absent melting reactions in the elitic system: consequences for crusta differentiation", Contributions to Mineralogy and Petrology 98 (1988) 257-276. [DOI:10.1007/BF00375178]
24. [24] Kretz R., "Symbols for rock-forming minerals", American Mineralogy 68 (1983) 277-279.
25. [25] Yardley B.W.D., "An introduction to Metamorphic Petrology", Longman (1991) 248p.
26. [26] Deer W. A., Howie R. A., Zussman J., "Rock- forming minerals", 3rd vol., Longman, London (1962).
27. [27] Coleman R. G., Lee D. E., Beatty L. B., Brannock W. W., "Eclogites and eclogites: their differences and similarities", Geological Society America Bulletin 76(5) (1965) 483-508. [DOI:10.1130/0016-7606(1965)76[483:EAETDA]2.0.CO;2]
28. [28] Holland T. J. B., Powell R., "An internally consistent thermodynamic data set for phases of petrological interest", Journal of Metamorphic Geology 16 (1998) 309–344. [DOI:10.1111/j.1525-1314.1998.00140.x]
29. [29] Harley S. L., Carrington D. P., "The distribution of H2O between cordierite and granitic melt: Improved calibration of H2O incorporation in cordierite and its application to high-grade metamorphism and crustal anataxis", Journal of Petrology 42 (2001) 1595-1620. [DOI:10.1093/petrology/42.9.1595]
30. [30] Thompson P., Harley S. L., Carrington D. P., "H2O-CO2 partitioning between fluid, cordierite and granitic melt at 5 kbar and 900 °C", Contributions to Mineralogy and Petrology 150 (2001) 170-190.
31. [31] Harley S., "Cordierite as a sensor of fluid and melt distribution in crustal metamorphism", Mineraloigical Magazine 58a (1994) 374-375. [DOI:10.1180/minmag.1994.58A.1.196]
32. [32] Stevens G., Clemens J. D., "Fluid-absent melting and the roles of fluids in the lithosphere: a slanted summary?", Chemical Geology 108 (1993) 1-17. [DOI:10.1016/0009-2541(93)90314-9]
33. [33] Carrington D. P., Harley S. L., "Cordierite as a momnitor of fluid and melt water contents in the lower crust: an experimental calibration", Geology 24 (1996) 647- 650. https://doi.org/10.1130/0091-7613(1996)024<0647:CAAMOF>2.3.CO;2 [DOI:10.1130/0091-7613(1996)0242.3.CO;2]
34. [34] Carrington D. P., Harley S. L., "Partial melting and phase relations in high-grade metapelites: an experimental petrogenetic grid in the KFMASH system", Contributions to Mineralogy and Petrology 120 (1995) 270-291. [DOI:10.1007/BF00306508]
35. [35] Vry J. K., Brown P. E., Valley J. W., "Cordierite volatile content and the role of CO2 in high-grade metamorphism", American Mineralogist 75 (1990) 71-88.
36. [36] Johannes W., Holtz F., "Petrogenesis and Experimental Petrology of Granoitic Rocks", Berline: Springer Verlag (1996). [DOI:10.1007/978-3-642-61049-3]
37. [37] Rigby M. J., Droop G. T. R., Bromiley G. D., "Variations in fluid activity across the etive thermal aureole, Scotland: evidence from cordierite volatile contents", Journal of Metamorphic Geology 26 (2008) 331-346. [DOI:10.1111/j.1525-1314.2007.00752.x]

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