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Sepahi A A, Salami S, Maanijou M. The study of petrography and mineral chemistry in aplite-pegmatites from Simin valley (south of Hamedan). www.ijcm.ir 2020; 28 (1) :37-50
URL: http://ijcm.ir/article-1-1417-en.html
Abstract:   (2039 Views)
Aplitic and pegmatitic dykes  exposed in southeast of Hamedan in the Simin area. From the margin to the center of these dykes, two typical textural areas present that obviously indicate effect of crystallization progress: 1- In the marginal zone, fabrics consist of anisotropic textures of the outer zones, including fine-grained units, graphic intergrowths, and unidirectional solidification textures and 2- In the interior zone that have coarse, blocky textures. Microprobe analysis performed on tourmaline, plagioclase and K-feldspar minerals. Tourmalines have schorlite composition. In the FeO/(FeO+MgO) vs. MgO diagram that determine origin of tourmalines, the studied tourmalines have Fe# between 0.8 to 1 that indicates they formed in magmatic conditions and external hydrothermal fluids and don’t take part in their genesis. Compositions of analyzed plagioclases are albite-rich (Ab90-100) and K-feldspars have 92-97 percent K-feldspar. This  indicates  progress of fractional crystallization  which is related to magma. Studied of tourmaline zoning is well visible at thin sections and in the chemical analyses. In the analyzed feldspars, high amount of Rb (1319 ppm) and also Cs (205 ppm) indicate high degree of fractionation which is related to magma.
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References
1. [1] Jahns R.H., "The genesis of pegmatites. I. Occurrence and origin of giant crystals", American Mineralogist 38 (1953) 563-598.
2. [2] Jahns R.H., Burnham C.W., "Experimental studies of pegmatite genesis: I. A model for the derivation and crystallizationof granitic pegmatites", Economic Geology 64 (1969) 843- 864. [DOI:10.2113/gsecongeo.64.8.843]
3. [3] Anderson G.M., Burnham C.W., "Feldspar solubility and the transport of aluminum under metamorphic conditions", American Journal of Science 283 (1983) 283-297.
4. [4] Tagirov B., Schott J., Harrichourry J.C., Salvi, S., "Experimental study of aluminum speciation in fluoride-rich supercritical fluids", GeochimicaetCosmochimicaActa 66 (2002) 2013-2024. [DOI:10.1016/S0016-7037(01)00899-7]
5. [5] London D., "Pegmatites", Canadian Mineralogist Special Publication 10 (2008) 368 pp.
6. [6] Frahpour M., "Petrofabric analysis of regional metamorphic rocks from east of Hamedan batholith", MSc thesis, TarbiatModares University, Tehran, Iran (1997). 120p (in Persian).
7. [7] Jafari S. R., "Petrology of migmatites and plutonic rocks from south of Simin area (Hamedan)", MSc thesis, Bu-Ali Sina University, Hamedan, Iran (2006). 156p (in Persian).
8. [8] MolaeeYeganeh T., "A study of controling factors for irregular distribution of kyanite in the metamorphic and plutonic rocks of the Hamedan area", MSc thesis, Bu-Ali Sina University, Hamedan, Iran (2009). 135p (in Persian).
9. [9] Izadikian L., "Structural and petrofabric analysis of metamorphic rocks of Alvand mountain (south and southwest of Hamadan)", Ph.D. Thesis in tectonic, ShahidBeheshti university, Tehran, Iran (2009). 157 (in persian).
10. [10] Sepahi A. A., Salami, S., Tabrizi M.,"Geochemistry of tourmalines in aplitic and pegmatitic dikes from Alvand plutonic and metamorphic rocks of the Hamedan area", Iranian Journal of Crystallography and Mineralogy. 3 (2014) 495-506 (in Persian).
11. [11] Amidi M., Majidi B., "Explanatory Text of Hamadan Quadrangle Map Scale 1:250,000. Geology Survey of Iran", (1977).
12. [12] Mohajjel M., Sahandi M., "Tectonic evolution of Sanandaj-Sirjan zone at the northwest part and introduce new subzone", Scientific Quarterly Journal of Geoscience. 31-32 (1999) 2001.
13. [13] Izadikian L., Alavi A., Mohajjel M., "Structural analysis of the Simin-DarrehMoradbeik shear zone, south of Hamedan", Iranian Journal of Geosciences 75 (2010) 39-46 (in Persian).
14. [14] Jafari S. R.,"Petrology of high grade metamorphic rocks in Hamedan and adjacentareas inSanandaj-Sirjan Zone".Ph.D. thesis, Bu-Ali Sina University, Hamedan, Iran (2018).201p (in Persian).
15. [15] London D., "The origin of primary textures in granitic pegmatites", Canadian Mineralogist 47 (2009) 697-724. [DOI:10.3749/canmin.47.4.697]
16. [16] Hawthorne F.C., Henry D.J., "Classification of the minerals of the tourmaline group", European Journal of Mineralogy 11 )1999(201-215. [DOI:10.1127/ejm/11/2/0201]
17. [17] Collines A.C., "Mineralogy and geochemistry of tourmaline in contrasting hydrothermal system, Coplapo area, Northern Chile", Ph.D. Thesis.Univrsity of Arizona, United States (2010). 225p.
18. [18] Rosenberg P.E., Foit, F.F., "Synthesis and characterization of alkali-freetourmaline", American Mineralogist 64 (1979) 180-186.
19. [19] Slack J.F., Palmer M.R., Stevens B.P.J., Barnes R.G.,"Origin significance of tourmaline-rich rocks in the Broken Hill district, Australia", Economic Geology 88 (1993) 505-541. [DOI:10.2113/gsecongeo.88.3.505]
20. [20] Trumbull R.B., Chaussidon M., "Chemical and boron isotopic composition of megmatic and hydrothermal tourmalines from the Sinceni granite-pegmaite system in Swaziland", Chemical Geology 153 (1999) 125-137. [DOI:10.1016/S0009-2541(98)00155-7]
21. [21] Selway J.B., Breaks, F.W., "Tindle, A.G., A Review of Rare-Element (Li-Cs-Ta) Pegmatite Exploration Techniques for the Superior Province, Canada, and Large Worldwide Tantalum Deposits", Exploration and Mining Geology 14 (2005) 1-30. [DOI:10.2113/gsemg.14.1-4.1]
22. [22] Torres-Ruiz J., Pesquera A., Gil-Crespo P.P., Vellila N., "Origin and petrogenetic implications of tourmaline-rich rocks in the Sierra Nevada (Betic Cordillera, southeastern Spain)", Chemical Geology 197 (2003) 55-86. [DOI:10.1016/S0009-2541(02)00357-1]
23. [23] Manning D.A.C., "Chemical and morphological variation in tourmalines from the Hub Kapong batholith of Peninsular Thailand", Mineralogical Magazine 45 (1982) 139-147. [DOI:10.1180/minmag.1982.045.337.16]
24. [24] London D., Manning D.A.C., "Chemical Variation and Significance of tourmaline from southwest England", Economic Geology 90 (1995) 495-519. [DOI:10.2113/gsecongeo.90.3.495]
25. [25] Pesquera A., Velasco F., "Mineralogy, geochemistry and geological significance oftourmaline - rich rocks from the Paleozoic Cinco Villas massif (western Pyrenees, Spain)", Contributions to Mineralogy and Petrology 129 (1997) 53-74. [DOI:10.1007/s004100050323]
26. [26] Pesquera A., Torres-Ruiz J., Gil-Grespo P. P., Velilla N., "Chemistry and genetic implications of tourmaline and Li-F-Cs micas from the Valdeflores area (Caceres, Spain)", American Mineralogist 84 (1999) 55-69. [DOI:10.2138/am-1999-1-206]
27. [27] Pirajno F., Smithies R.H., "The FeO/ (FeO+MgO) ratio of tourmaline: A useful indicator of spatial variations in granite-related hydrothermal mineral deposits", Journal of Geochemical Exploration 42 (1992) 371-381. [DOI:10.1016/0375-6742(92)90033-5]
28. [28] Henry D.J., GuidottiCh.V., "Tourmaline as petrogenetic indicator mineral: an example fromstaurolite-grade metapelites of NW Mains", American Mineralogist 70 (1985)1-15.
29. [29] Deer W.A., Howie, A., Zussman J., "Anintroduction to the rock-forming minerals", Longman, London (1991) 528p.
30. [30] Tabrizi M., "The role of dykes and late-stage veins in the evolution of the Alvand Plutonic", MSc thesis, Bu-Ali Sina University, Hamedan, Iran (2013) .171p (in Persian).

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