شیمی کانی‌ها و دما فشارسنجی گارنت استارولیت شیست‌های منطقه همدان

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه بوعلی سینا،

چکیده

استارولیت شیست‌های دربردارنده گارنت بخش مهمی از دنباله سنگ‌های دگرگونی ناحیه‌ای در منطقه همدان (شمال پهنه سنندج-سیرجان) را تشکیل می‌دهند. این سنگ‌ها دارای پورفیروبلاست‌های استارولیت و گارنت هستند که در زمینه‌ای متشکل از بیوتیت، مسکویت و کوارتز قرار گرفته‌اند. استارولیت‌ها از گونه آهن‌دار هستند و تنوع ترکیب شیمیایی اندکی نشان می‌دهند. آلماندین مهم‌ترین جزء تشکیل دهنده گارنت‌هاست، البته افزایش آهن و منیزیم و کاهش منگنز از مرکز به کناره این بلورها نیز دیده می‌شود که نشان دهنده تشکیل آنها طی دگرگونی پیشرونده است. بیوتیت‌ها نیز از نوع سیدروفیلیت هستند. علاوه بر این کانی‌ها، کلریت‌های غنی از آهن و از گونه ریپیدولیت در کناره برخی از استارولیت­ها دیده می‌شوند که از دگرگونی پسرونده آنها شکل گرفته­اند. روش‌های مختلف دما-فشارسنجی به کار رفته نشان می‌دهند که دما و فشار نهایی دگرگونی برای گارنت استارولیت شیست‌های همدان به طور میانگین 560 درجه سانتیگراد و 3 تا 5/3 کیلوبار بوده است. بر این اساس می‌توان آنها را از انواع سنگ‌های دگرگونی دما بالا-فشار متوسط تا پایین نوع بوچان دانست.     

کلیدواژه‌ها

عنوان مقاله [English]

Mineral chemistry and thermobarometery of garnet staurolite schists from the Hamedan area

چکیده [English]

Garnet bearing staurolite schists comprise an important part of regional metamorphic succession in the Hamedan area (north of the Sanandaj-Sirjan zone). These rocks contain staurolite and garnet porphyroblats that lie in a matrix which is composed of biotite, muscovite and quartz. The staurolites in Fe-rich and show little chemical composition diversities. Almandin is the most important component of the garnets although core to rim Fe and Mg increasing and Mn decreasing are visible indicating that they formed during a progressive metamorphism. The biotites are siderophyllite type. In addition to these minerals, Fe-rich chlorites of ripidolite type are present in margins of some staurolites that were formed by retrogressive metamorphism. Various thermobarometery methods show that top P-T metamorphic condition for the garnet saturolite schists of the Hamedan area was 560 oC in average and 3 to 3.5 kb. According to the results, these rocks can be considered as high T- medium to low P Buchan type metamorphic associations.

کلیدواژه‌ها [English]

  • garnet staurolite schists Mineral chemistry
  • chemical composition
  • Thermobarometry the Hamedan area

مراجع

  1. [1] Stöcklin B., "Structural history and tectonics of Iran", a review 52 (1968) 1229-1258.
  2. [1] Stöcklin B., "Structural history and tectonics of Iran", a review 52 (1968) 1229-1258.
  3. [2] Eghlimi B., "1/100000 Geological map of Hamedan", Geological Survey & Mineral Explorations of Iran (GSI) (2000).
  4. [2] Eghlimi B., "1/100000 Geological map of Hamedan", Geological Survey & Mineral Explorations of Iran (GSI) (2000).
  5. [3] Moin Vaziri H., Baharifar A. A., "The study of protholite of metamorphic rocks in the hamedan area", 1thannual conference of Iran geology society, Tehran (1997).
  6. [3] Moin Vaziri H., Baharifar A. A., "The study of protholite of metamorphic rocks in the hamedan area", 1thannual conference of Iran geology society, Tehran (1997).
  7. [4] Baharifar A.A., "New perspective on petrogenesis of the regional metamorphic rocks of Hamedan area", M. Sc. Thesis (in Farsi), Tarbiat Moallem University, Tehran, Iran (1997).
  8. [4] Baharifar A.A., "New perspective on petrogenesis of the regional metamorphic rocks of Hamedan area", M. Sc. Thesis (in Farsi), Tarbiat Moallem University, Tehran, Iran (1997).
  9. [5] Sepahi A.A., "Petrology of the Alvand plutonic complex with special reference on granitoids", Ph. D. Thesis (in Farsi), Tarbiat Moallem University, Tehran, Iran.(1999)
  10. [5] Sepahi A.A., "Petrology of the Alvand plutonic complex with special reference on granitoids", Ph. D. Thesis (in Farsi), Tarbiat Moallem University, Tehran, Iran.(1999)
  11. [6] Baharifar A.A., "Petrology of metamorphic rocks in Hamedan area", Ph.D. Thesis (in Farsi), Tarbiat Moallem University, Tehran, Iran(2004).
  12. [6] Baharifar A.A., "Petrology of metamorphic rocks in Hamedan area", Ph.D. Thesis (in Farsi), Tarbiat Moallem University, Tehran, Iran(2004).
  13. [7] Sepahi A. A., Whitney D. L., Baharifar A. A., "Petrogenesis of andalusite-kyanite-sillimanite venis and host rocks,Sanandaj-Sirjanmetamorphic belt, Hamadan,Iran", Metamorphic Geology 22 (2004) 119-134. [DOI:10.1111/j.1525-1314.2004.00502.x]
  14. [7] Sepahi A. A., Whitney D. L., Baharifar A. A., "Petrogenesis of andalusite-kyanite-sillimanite venis and host rocks,Sanandaj-Sirjanmetamorphic belt, Hamadan,Iran", Metamorphic Geology 22 (2004) 119-134. [DOI:10.1111/j.1525-1314.2004.00502.x]
  15. [8] Kertz R., "Symbol for rock- forming minerals", American Mineralogist 68 (1983) 277- 279.
  16. [8] Kertz R., "Symbol for rock- forming minerals", American Mineralogist 68 (1983) 277- 279.
  17. [9] Izadi kian L., "Fabricand structural analysis of almogholagh region (northwest of Hamedan) ", M.Sc thesis (in Farsi), Tarbiat Modarres University, Tehran, Iran(2004).
  18. [9] Izadi kian L., "Fabricand structural analysis of almogholagh region (northwest of Hamedan) ", M.Sc thesis (in Farsi), Tarbiat Modarres University, Tehran, Iran(2004).
  19. [10] Deer W. A., Howie R. A., Zussman J., "An Introduction to the Rock Forming Minerals", Longman, London (1992) 528 p.
  20. [10] Deer W. A., Howie R. A., Zussman J., "An Introduction to the Rock Forming Minerals", Longman, London (1992) 528 p.
  21. [11] Grew E. S., Locock A. J., Mills S.J., Galuskina I.O., Galuskin E.V., Halenius U., IMA Report Nomenclature of the garnet supergroup, American Mineralogist 98 (2013) 785–811. [DOI:10.2138/am.2013.4201]
  22. [11] Grew E. S., Locock A. J., Mills S.J., Galuskina I.O., Galuskin E.V., Halenius U., IMA Report Nomenclature of the garnet supergroup, American Mineralogist 98 (2013) 785–811. [DOI:10.2138/am.2013.4201]
  23. [12] Tracy R. J., "Compositional zoning and inclusions in metamorphic minerals. In Ferry, J, M., (ed). Characterization of metamorphism", through Mineral Equilibria Reviwes in Mineralogy and geochemistry, (1982) Contributions to Mineralogy and Petrology 157(2009) 95–110.
  24. [12] Tracy R. J., "Compositional zoning and inclusions in metamorphic minerals. In Ferry, J, M., (ed). Characterization of metamorphism", through Mineral Equilibria Reviwes in Mineralogy and geochemistry, (1982) Contributions to Mineralogy and Petrology 157(2009) 95–110.
  25. [13] Miyashiro A., "Metamorphism and metamorphic belts Allen & Unwin. London", (1973) 492 p. [DOI:10.1007/978-94-011-6836-6]
  26. [13] Miyashiro A., "Metamorphism and metamorphic belts Allen & Unwin. London", (1973) 492 p. [DOI:10.1007/978-94-011-6836-6]
  27. [14] Mposkos E., Liati A., "Metamorphic evolution of metapelites in the High Prersure Terane of the Rhodope Zone", Northern Greece. Canadian Mineralogist., 31(1993) 401-424.
  28. [14] Mposkos E., Liati A., "Metamorphic evolution of metapelites in the High Prersure Terane of the Rhodope Zone", Northern Greece. Canadian Mineralogist., 31(1993) 401-424.
  29. [15] Vance D., Holland T. J. B., "A detailed isotopic and petrological study of single garnet from the Gassetts Schist", Vermont. Contrbution to Mineralogy and Petrology., 114 (1993) 101-118. [DOI:10.1007/BF00307868]
  30. [15] Vance D., Holland T. J. B., "A detailed isotopic and petrological study of single garnet from the Gassetts Schist", Vermont. Contrbution to Mineralogy and Petrology., 114 (1993) 101-118. [DOI:10.1007/BF00307868]
  31. [16] Williams M. L., Gramling J. A., "Manganese, ferric iron, and the eouilibrium between garnet and biotite", American Mineralogist., 75 (1990) 886-908.
  32. [16] Williams M. L., Gramling J. A., "Manganese, ferric iron, and the eouilibrium between garnet and biotite", American Mineralogist., 75 (1990) 886-908.
  33. [17] Kanazawa T., Tsunogae T., Sato K., Santosh M., "The stability and origin of sodicgedrite in ultrahigh-temperature Mg–Al granulites: a case study from the Gondwana suture in southern India", Contrbution to Mineralogy and Petrology., 157(2009) 202-219. [DOI:10.1007/s00410-008-0322-0]
  34. [17] Kanazawa T., Tsunogae T., Sato K., Santosh M., "The stability and origin of sodicgedrite in ultrahigh-temperature Mg–Al granulites: a case study from the Gondwana suture in southern India", Contrbution to Mineralogy and Petrology., 157(2009) 202-219. [DOI:10.1007/s00410-008-0322-0]
  35. [18] Vidal O., Para T., "Exhumation paths of high pressure metapelites obtained from local eqilibria for chlorite-phengite assemblage", Geological Magazine 35 (2000) 139-161. [DOI:10.1002/gj.856]
  36. [18] Vidal O., Para T., "Exhumation paths of high pressure metapelites obtained from local eqilibria for chlorite-phengite assemblage", Geological Magazine 35 (2000) 139-161. [DOI:10.1002/gj.856]
  37. [19] Hey M. T., "A new revew of cholorite", mineral Magazine 30 (1954) 278-292.
  38. [19] Hey M. T., "A new revew of cholorite", mineral Magazine 30 (1954) 278-292.
  39. [20] Laird J., "Chlorites: Metamorphic Petrology. In: Bailey S. W. (ed.) Hydrous Phyllosilicates exclusive of micas", Reviwes in Mineralogy and geochemistry 19 (1988) 405-453.
  40. [20] Laird J., "Chlorites: Metamorphic Petrology. In: Bailey S. W. (ed.) Hydrous Phyllosilicates exclusive of micas", Reviwes in Mineralogy and geochemistry 19 (1988) 405-453.
  41. [21] Henry D.J., Guidotti C.V., "Titanium in biotite from metapelitic rocks: Temperature effects, crystal-chemical controls, and petrologic applications", American Mineralogist 87 (2002) 375-382. [DOI:10.2138/am-2002-0401]
  42. [21] Henry D.J., Guidotti C.V., "Titanium in biotite from metapelitic rocks: Temperature effects, crystal-chemical controls, and petrologic applications", American Mineralogist 87 (2002) 375-382. [DOI:10.2138/am-2002-0401]
  43. [22] Henry D. J., Guidotti C. V., Thomson J. A., "The Ti-saturation surface for low-to-medium pressure metapelitic biotites: Implications for geothermometry and Ti-substitution mechanisms", American Mineralogist 90 (2005) 316-328. [DOI:10.2138/am.2005.1498]
  44. [22] Henry D. J., Guidotti C. V., Thomson J. A., "The Ti-saturation surface for low-to-medium pressure metapelitic biotites: Implications for geothermometry and Ti-substitution mechanisms", American Mineralogist 90 (2005) 316-328. [DOI:10.2138/am.2005.1498]
  45. [23] Ferry J. M., Spear F. S., "Experimental calibration of the partitioning of Fe and Mg between biotite and garnet", Contrbution to Mineralogy and Petrology.,66 (1978) 113–117. [DOI:10.1007/BF00372150]
  46. [23] Ferry J. M., Spear F. S., "Experimental calibration of the partitioning of Fe and Mg between biotite and garnet", Contrbution to Mineralogy and Petrology.,66 (1978) 113–117. [DOI:10.1007/BF00372150]
  47. [24] Bhattacharya A., Mazumdar A. C., Sen S. K., "Fe-Mg mixing in cordierite: constraints from natural data and implication for cordierite–garnet geothermometry in granulites", American Mineralogist 73 (1992) 338–344.
  48. [24] Bhattacharya A., Mazumdar A. C., Sen S. K., "Fe-Mg mixing in cordierite: constraints from natural data and implication for cordierite–garnet geothermometry in granulites", American Mineralogist 73 (1992) 338–344.
  49. [25] Hodges K. V. Y., Spear F. S., "Geothermometry, geobarometry and the Al2SiO5 triple point at Mt. Moosilauke, New Hampshire", American Mineralogist 67 (1982) 1118-1134.
  50. [25] Hodges K. V. Y., Spear F. S., "Geothermometry, geobarometry and the Al2SiO5 triple point at Mt. Moosilauke, New Hampshire", American Mineralogist 67 (1982) 1118-1134.
  51. [26] Perchuk L. L. Y., Larent'eva I. V., "Experimental investigation of exchange equilibria in the system cordierite-garnet-biotite. In: S.K. Saxena (Ed) Kinetics and Equilibrium in Mineral Reactions. Advances in Physical Geochemistry", Springer-Verlag, New-York 3 (1983) 199-239. [DOI:10.1007/978-1-4612-5587-1_7]
  52. [26] Perchuk L. L. Y., Larent'eva I. V., "Experimental investigation of exchange equilibria in the system cordierite-garnet-biotite. In: S.K. Saxena (Ed) Kinetics and Equilibrium in Mineral Reactions. Advances in Physical Geochemistry", Springer-Verlag, New-York 3 (1983) 199-239. [DOI:10.1007/978-1-4612-5587-1_7]
  53. [27] Kretz R., "Metamorphic crystallization", John Wiley & Sons (1994) 507P.
  54. [27] Kretz R., "Metamorphic crystallization", John Wiley & Sons (1994) 507P.
  55. [28] Hollocher K.T., "Retrograde metamorphism of the lower devonian littleton formation In the new Salem area, west-central massachusetts", geo. Umass. Edu (1981) 268P.
  56. [28] Hollocher K.T., "Retrograde metamorphism of the lower devonian littleton formation In the new Salem area, west-central massachusetts", geo. Umass. Edu (1981) 268P.
  57. [29] Yardly B. W. D., "An introduction to metamorphic petrology", Longman (1991) 248P.
  58. [29] Yardly B. W. D., "An introduction to metamorphic petrology", Longman (1991) 248P.
  59. [30] Hydman D. W., "Petrology of Igncous and metamorphic Rocks", 2nd edn., Mc GrawHill", New York (1985) 786p.
  60. [30] Hydman D. W., "Petrology of Igncous and metamorphic Rocks", 2nd edn., Mc GrawHill", New York (1985) 786p.
  61. [31] Lang H. M., "Quantitative interpretation of within-outcrop variation in metamorphic assemblage in staurolite-kyanite-grade metapelites, Baltimore, Maryland", 29 (1991) 655-671.
  62. [31] Lang H. M., "Quantitative interpretation of within-outcrop variation in metamorphic assemblage in staurolite-kyanite-grade metapelites, Baltimore, Maryland", 29 (1991) 655-671.
  63. [32] Mohajjel M., Baharifar A., Moinevaziri H., Nozaem R., "Deformation history, micro-structure and P-T-t path in ALS-bearing schists, southeast Hamadan, Sanandaj-Sirjan zone, Iran", Journal of Geological Society of Iran 1 (2006) 11–19.
  64. [32] Mohajjel M., Baharifar A., Moinevaziri H., Nozaem R., "Deformation history, micro-structure and P-T-t path in ALS-bearing schists, southeast Hamadan, Sanandaj-Sirjan zone, Iran", Journal of Geological Society of Iran 1 (2006) 11–19.

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  • تاریخ دریافت: 02 اردیبهشت 1396
  • تاریخ بازنگری: 08 مرداد 1396
  • تاریخ پذیرش: 20 شهریور 1396

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