ویژگی ژئوشیمیایی سنگ‌های آمفیبولیتی پیر عباد، شمال‌شرق ازنا، پهنه سنندج-سیرجان

نوع مقاله : علمی -پژوهشی

نویسندگان

دانشگاه شهرکرد

چکیده

آمفیبولیت‌های پیرعباد در شمال­شرق شهر ازنا در استان لرستان در پهنه سنندج-سیرجان قرار دارند. این آمفیبولیت‌ها به صورت توده‌های لنزی شکل در منطقه پراکندگی دارند و کم و بیش متحمل دگرشکلی شکل‌پذیر شده‌اند و بنابراین گاهی شواهد بارزی از این نوع دگرشکلی نظیر خطواره، برگواره و ماهی کانیایی را به نمایش می‌گذارند. آمفیبول و پلاژیوکلاز دو کانی اصلی تشکیل‌دهنده این سنگ‌ها می‌باشند. شواهد ژئوشیمیایی نشان می‌دهد که این آمفیبولیت‌ها دارای منشاء آذرین هستند. سنگ مادر این آمفیبولیت‌ها بازالت با ماهیت ساب­آلکالن و تولئیتی می‌باشد. در نمودار به هنجار شده به کندریت غنی‌شدگی از LREE ها نسبت به HREE ها مشاهده می‌شود. همچنین در نمودار به هنجار شده به گوشته اولیه HFSE ها و HREE ها تهی‌شدگی نشان داده‌اند. نمودارهای تفکیک محیط تکتونیکی، آنومالی منفی Nb و Ti به همراه مقادیر بالایTh  و Ba/Yb نشان‌دهنده موقعیت حوضه پشت کمان آغازین برای تشکیل ماگمای سازنده پروتولیت این سنگ‌ها می‌باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Geochemical characteristic of the amphibolite rocks of Pir-Ebad, NE Azna, Sanandaj-Sirjan Zone

چکیده [English]

Pir-abad amphibolotes in the northest Azna locates sanandaj –Sirjan zone. The amphibolites show a discontinuous outcrops as pods and lenses. Sometimes have lineation and foliation. Amphibole and plagioclase are main mineral constituents in the rocks. The amphibolites have igneous source. Their protholite is basalt with sub-alkaline and tholeiitic nature. Chondrite normalized-REE diagram show LREE enrichment relatetoon to HREE. Primitive mantle- normalized trace elements diagram show depletion of HFSE and HREE. Tectonic discrimination diagrams, negative Nb-Ta anomalies and high Th and Ba/Yb display the back-arc basin setting or supra-subduction zone environment.

کلیدواژه‌ها [English]

  • Geochemistry-Amphibolite-Suprasubduction- Pir_ abad- Sanandaj _Sirjan zone

مراجع

  1. -شاکری، ا.، 1386. آنالیز ساختاری ناحیه دگرگونی غرب ازنا، با تاکیدی بر مطالعات ریزساختاری، پایان‌نامه کارشناسی‌ارشد تکتونیک، دانشگاه شهید بهشتی.
  2. -کولیوند، س.، شبانیان، ن. و داودیان، ا.، 1392. ماهی آمفیبول در متابازیت‌های پیرعباد، شمال‌شرق ازنا، سومین همایش زمین‌شناسی فلات قاره، دانشگاه آزاد اسلامی واحد زرند.
  3. -Alavi, M., 1994. Tectonics of the Zagros orogenic belt of Iran, new data and information, Tectonophysics, v. 229, p. 211-238.
  4. -Azizi, H. and Jahangiri, A., 2008. Cretaceous subduction-related volcanism in the northern Sanandaj- Sirjan Zone, Iran, Journal of Geodynamics, v.45, p. 178-190.
  5. -Azizi, H., Asahara, Y., Mehrabi, B. and Lin Chung, S., 2011. Geochronological and geochemical constraints on the petrogenesis of high-K granite from Suffi Abad area, Sanandaj-Sirjan, NW Iran, Chemie der Erde – Geochemistry, v. 71, p. 363-376.
  6. -Berberian, M. and King, G.C.P., 1981. Towards a paleogeography and tectonic evolution of Iran, Canadian Journal of Earth Sciences, v. 18, p. 210-265.
  7. -Berthier, F., Ballaut, J.P., Halbronn, B. and Maurizot, P., 1974. Étudestratigraphique, petrologiqueet structural de la region de Khorramabad (Zagros Iran), Thèse, 3 ème cycle, Universiteet Medicale de Gronoble, France, 281 p.
  8. -Choe, W.H., Lee, J.I., Lee, M.J., Hur, S.D. and Jin, Y.K., 2007. Mantle heterogeneity beneath the Antarctic-Phoenix ridge off Antarctic Peninsula, Journal of the Petrological Society of Korea, v.14, p. 73-81 (in Korean with English abstract).
  9. -Coonrad, W.L. and Elliott, R., 1984. The United States Geological Survey in Alaska, Accomplishments During 1981, US Geological Survey, v. 844-847, p.135.
  10. -Davoudian, A., Genser, J., Neubauer, F. and Shabanian, N., 2016. 40Ar/39Ar mineral ages of eclogites from North Shahrekord in the Sanandaj–Sirjan Zone, Iran, Implications for the tectonic evolution of Zagros orogeny, Gondwana Research, v. 37, p. 216-240.
  11. -De La Roche, H., Leterrier, J., Grande claude, P. and Marchal, M., 1980. A classification of volcanic and plotonic rocks using R1-R2 diagrams and major element analyses, its relationship’s and current nomenclature, Chemical Geology, v. 29, p. 183-210.
  12. -Floyd, P.A., Kelling, G., Gokcen, S.L. and Gokcen, N., 1991. Geochemistry and tectonic environment of basaltic rocks from the Misisophiolitic melange, south Turkey, Chemical Geology, v. 89, p. 293-380.
  13. -Hadi, A., Kameran, D. and Ismael, S., 2013. Characteristics of the amphibolite rocks of Penjween area, Kurdistan Region, northeast Iraq, Genetic implication and association with Penjween Ophiolite Complexes, Journal of Environment and Earth Science, v. 3, p. 22-44.
  14. -Hawkesworth, C.J., Gallagher, K., Hergt, J.M. and McDermott, F., 1993. Mantle and slab contributions in arc magmas, Annual Review of Earth and Planetary Sciences, v.21, p. 175-204.
  15. -Hopson, C.A., Wright, J.E. and Shervais, J.W., 2008. Ophiolites, arcs, and batholiths, a tribute to Cliff Hopson, Geological Society of America, p. 418-510.
  16. -Irvine, T.N. and Baragar, W.R.A., 1971. A Guide to Chemical Classification of Common Volcanic Rocks, Canadian Journal of Earth Sciences, v. 8, p. 523-547.
  17. -Jamshidi Badr, M.J., Collins, A.S. and Masoudi, F., 2013. The U-Pb age, geochemistry and tectonic significance of granitoids in the Soursat Complex, Northwest Iran, Turkish Journal of Earth Sciences, v. 22, p. 1-31.
  18. -Juliani, C. and McReath, I., 1993. Petroquimica de metabasitos, Metodologia para identificao de magmaticas epos- magmaticas, Geologia Ciencia e Tecnica- Centro Paulista de Esludos Geologicos, v.10, p. 31-39.
  19. -Kocak, K., 1993. The petrology and geochemistry of the Ortakoy area, Central Turkey, Ph.D. Thesis, Glasgow University, 280 p.
  20. -Kocak, K., 2002. Mineralogical and petrographical characteristics of the Ortakoy amphibolites and tremolite-bearing gneisses, Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi, v. 8, p. 239-245 (in Turkish).
  21. -Kocak, K., Kurt, H., Veysel, Z. and Ferre, E.C., 2007. Characteristic of the amphibolites from nigde metamorphic (Central Turkey), deduced from whole rock and mineral chemistry, Geochemical Journal, v. 41, p. 241-257.
  22. -Leak, B.E., 1964. The Chemical discrimination between ortho and para Amphibolites, Journal of Petrology, v. 5, p. 238-254.
  23. -Le Maitre, R.W., 1989. A Classification of Igneous Rocks and Glossary of Terms, Blackwell Scientific Publication, Oxford, 193 p.
  24. -Miyashiro, A., 1975. Classification, Characteristics and Origin of Ophiolites, Journal of Geology, v. 83, p. 249-281.
  25. -Mohajjel, M. and Fergusson, C.L., 2000. Dextral Transpression in Late Cretaceous Continental Collision, Sanandaj-Sirjan Zone, Western Iran, Journal of Structural Geology, v. 22, p. 1125-1139.
  26. -Nakamura, N., 1974. Determination of REE, Ba, Fe, Mg, Na and K in carbonaceous and ordinary chondrites, Geochimica et Cosmochimica Acta, v. 38, p. 757-775.
  27. -Pearce, J.A., 1982. Trace element characteristics of Lavas from destructive plate boundaries, In: Thrope, R. S. (ED): Orogenic andesites and related rocks, Chichester, England: John Wiley and Sons, p. 528-548.
  28. -Pearce, J.A., 1983. Role of sub-continental lithosphere in magma genesis at active continental margins, In: Hawkesworth, C.J. and Nurry, M.L., (Eds.), Continental Basalts and Mantle Xenoliths, Shiva, Nantwich, p. 230-249.
  29. -Pearce, J.A., 2008. Geochemical fingerprinting of oceanic basalts with applications to ophiolite classification and the search for Archean oceanic crust, Lithos, v.100, p. 14-48.
  30. -Ricou, L.E., Braud, J. and Brunn, J.A., 1976. Le Zagros, Memoire societe geologique de France, Hors-Serie, v. 8, p. 33-52.
  31. -Rollinson, H., 1996. Using geochemical data, evaluation, presentation and interpretation, Longman Ltd., Essex, England, 352 p.
  32. -Saunders, A.D., Norry, M.J. and Tarney, J., 1991. Fluid influence on the trace element com-positions of the subduction zone magmas, Royal Society of London Philosophical Transactions, v. 335, p. 377-392.
  33. -Sahandi, M.R., Radfar, J., Hoseinidoust, J. and Mohajjel, M., 2006. Explanatory Text of the Shazand Quadrangle Map, Geological Survey of Iran, Tehran, Iran.
  34. -Shabanian, N., Khalili, M., Davoudian, A. and Mohajjel, M., 2009. Petrography and geochemistry of mylonitic granite from Ghaleh-Dezh, NW Azna, Sanandaj-Sirjan zone, Iran, Neues Jahrbuch fur Mineralogie-Abhandlungen, v. 185, p. 2-16.
  35. -Sinton, J.M. and Fryer, P., 1987. Mariana trough lavas from 18°N, implications for the origin of back arc basin basalts, Journal of Geophysical Research, v. 92, p. 12782-12802.
  36. -Sinton, J.M., Ford, L.L., Chappell, B. and McCulloch, M.T., 2003. Magma genesis and mantle heterogeneity in the Manus back-arc basin, Papua New Guinea, Journal of Petrology, v.44, p. 159-195.
  37. -Stöckline, J., 1968. Structural history and tectonics of Iran, a review, Bulletin - American Association of Petroleum Geologists, v., 52, p. 1229-1258.
  38. -Sun, S.S. and McDonough, W.F., 1989. Chemical and isotopic systematic of oceanic basalts, implications for mantle composition and processes, In: Saunders, A.D. and Norry, M.J. (Eds.): Magmatism in ocean basins, Geological society of London, Special Publication, p. 313-345.
  39. -Taylor, S.R. and McLennan, S.M., 1985. The continental crust, its composition and evolution, Blackwell Oxford, England, 312 p.
  40. -Temizel, I. and Arslan, M., 2009. Mineral chemistry and petrochemistry of post-collisional Tertiary mafic to felsic cogenetic volcanics in the Ulubey (Ordu) Area, Eastern Pontides, NE Turkey, Turkish Journal of Earth Sciences, v. 18, p. 29-53.
  41. -Thiele, O., 1996. Zum alter der metamorphose in central Iran, Mitteilungen Der Osterrei Chischen Geographischen Gesellschaf, Wien, v. 58, p. 87-101.
  42. -Thirlwall, M.F., Smith, T.E., Graham, A.M., Theodorou, N., Hollings, P., Davidson, J.P. and Arculus, R.J., 1994. High field strength element anomalies in arc lavas, source or process? Journal of Petrology, v. 35, p. 819-838.
  43. -Thompson, R.N., 1984. Dispatches from the basalt front, 1. Experiments, The Proceedings of the Geologists' Association, v. 95, p. 249-262.
  44. -Wilson, M., 1989. Igneous petrogenesis-A global tectonic approach, Unwin Hyman London, England, 456 p.
  45. -Winchester, J.A. and Floyd, P.A., 1977. Geochemical Discrimination of Different Magma Series and Their Differentiation Products Using Immobile Elements, Chemical Geology, v. 20, p. 325-343.

فایل ها

هم رسانی

ارجاع به این مقاله

آمار