The study of garnet formation in the migmatite rocks, Hamadan area
Paper Details
The study of garnet formation in the migmatite rocks, Hamadan area
Abstract
The study area is located in the south-southeast of Hamedan in the Sanandaj-Sirjan zone that comprising low to high grade regional (orogenic) and thermal (contact) metamorphic rocks. Intruded by mafic, intermediate and felsic plutonic bodies. Hamadan metamorphic rocks can be divided in three groups: regional metamorphic, contact metamorphic and migmatites. migmatites division in two groups: silimanite migmatite and cordirite migmatite. Garnet crystals are common pyralespite (almandine) type and this mineral recognize in leucosome, melanosome and mesosome parts. Garnet crystals in the leucosome of migmatites have igneous and metamorphic origin. In the first case, the garnet crystals was euhedral, sustainable in leucosome of migmatites and are not transformation from around to other minerals. These garnets crystallize of melt from partial melting and have igneous origin. In the second case, the garnet crystals was subhedral to anhedraland are not stable in leucosome of migmatites. These garnets are transformation and reaction from around to other minerals. These crystals have metamorphic origin and possibly remnants of mesosome garnet that residue in melt from partial melting and not melting. According to the reaction garnet formed between 550-650 C̊ temepture.
Biermeier C, Stu¨we K. 2003. Strain rates from snowball garnet. Journal of Metamorphic Geology. 21, 253–268.
Brown M. 1994. The generation, segregation, ascent and emplacement of granite magma: the migmatite-to-crustally-derived granite connection in thickened orogens, Earth-Science Review, 36, 83-130.
Burton KW, O’NionsRK. 1991. Busa MD, Gray NH., 1992. Rotated stauroliteporphyroblasts in the Littleton Schist at Bolton, Connecticut, USA. Journal of Metamorphic Geology. 10, 627–636.
Busa MD, Gray NH. 1992. Rotated stauroliteporphyroblasts in the Littleton Schist at Bolton, Connecticut, USA. Journal of Metamorphic Geology. 10, 627–636.
Carlson WD, Denison C, Ketcham RA., 1995. Controls on the nucleation and growth of porphyroblasts: kinetics from natural textures and numerical models. Geology Journal. 30, 207–225.
Carlson WD, Denison C. 1992. Mechanisms of porphyroblast crystallization: results from high-resolution computed X-ray tomography. Science 257, 1236–1239.
Christensen JN, Rosenfeld JL, DePaoloDJ., 1989. Rates of tectonometamorphic processes from rubidium and strontium isotopes in garnet. Science. 244, 1465–1469.
Daniel CG, Spear FS. 1998. Three-dimensional patterns of garnet nucleation and growth. Geology. 26, 503–506.
Daniel CG, Spear FS. 1999. The clustered nucleation and growth processes of garnet in regional metamorphic rocks from northwest Connecticut, USA. Journal of Metamorphic Geology. 17, 503–520.
Ferry JM, Spear FS. 1978. Experimental calibration of the partitioning of Fe and Mg between biotite and garnet. Contributions to Mineralogy and Petrology, 66, 113–117.
HoischTD. 1991. Equilibria with the mineral assemblage quartz+muscovite+biotite+garnet+ plagioclase, and applications for the mixing properties of octohedrallycoordinatedcations in muscovite and biotite. Contributions to Mineralogy and Petrology, 108, 43–54.
Johnson SE, Dupee ME, Guidotti CV. 2006. Porphyroblast rotation during crenulation cleavage development: an example from the aureole of the Mooselookmeguntic pluton, Maine, USA. Journal of Metamorphic Geology. 24, 55–73.
Kretz R. 1973. Kinetics of the crystallization of garnet at two localities near Yellowknife. Journal of Mineral. 12, 1–20.
Kretz R. 1993. A garnet population in Yellowknife Schist, Canada. Journal of Metamorphic Geology. 11, 101–120.
Kretz R. 1994, Metamorphic crystallization, John wiley and sons, 507P.
Kruhl JH, Erdmann S, Buttner SH. 2007. Brittle-ductile microfabrics in naturally deformed cordierite: evidence for significant shortterm strain-rate variations. Journal of Structure Geology. 29,355–374.
Locock A. 2008. An Excel spreadsheet to recast analyses of garnet end-member componets, and a synopsis of the crystal chemistry of natural silicate garnets”. Computers and Geosciences. 34, 1769-1780.
Meth CE, Carlson WD. 1995.Diffusion-controlled synkinematic growth of garnet from a heterogeneous precursor at Passo del Sole, Switzerland. Journal of Mineral 43, 157–182.
Newton RC, HaseltonHT. 1981. Thermodynamics of the garnet-plagioclase-Al2SiO5-quartz geobaro-meter, Thermodynamics of Minerals and Melts. Springer-Verlag.
Norlander BH, Whitney DL, Teyssier C, Vanderhaeghe O. 2002. Partial melting and decompression of the Thor-Odin Dome, Shuswap metamorphic core complex.Canada. Cord.Lithos, 61, 103–125.
Passchier CW, Trouw RAJ, Zwart HJ, Vissers RLM. 1992. Porphyroblast rotation—eppursimuove. J Met Geol 10, 283–294.
Prior DJ. 1987. Syntectonicporphyroblast growth in phyllites: textures and processes. Journal of Metamorphic Geology. 5,27–39.
Sepahi AA. 2007. A detailed study of morphology and chemistry of garnet crystals with suggestion of new subdivisions: data from politic schists, hornfelses and aplites of hamadan region, Iranian. – Journal of Sci and Tecnology.
Tracy RJ. 1982. Compositional zoning and inclusions in metamorphic minerals. In Ferry, J.M., (Ed). Characterization of Metamorphism through Mineral Equilibria. Reveiw Mining.
Vance D, O’NionsRK. 1990. Isotopic chronometry of zoned garnet: growth kinetics and metamorphic histories. Earth Planet Science Letter. 97,227–240.
VernonRH. 1988. Sequential growth of cordierite and andalusiteporphyroblasts, Cooma Complex, Australia: microstructural evidence of a prograde reaction. Journal of Metamorphic Geology. 6,255– 269.
Wilbur DE, Ague JJ. 2006. Chemical disequilibrium during garnet growth: Monte Carlo simulations of natural crystal morphologies. Geology. 34,689–692.
Yardly BWD. 1991. An introduction to Metamorphic Petrology, Longman, 248 p.
Hoseeinmirzaee Zahra, Dadkhah Rasool (2014), The study of garnet formation in the migmatite rocks, Hamadan area; JBES, V5, N3, September, P392-398
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