بررسی منشأ و محیط زمین‌ساختی سنگ‌های آتشفشانی پالئوژن زرجه‌بستان(شمال خاور قزوین) با استفاده از REE و HFSE

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده زمین شناسی، پردیس علوم، دانشگاه تهران، تهران، ایران

2 گروه زمین شناسی، دانشکده علوم، دانشگاه بین المللی امام خمین، قزوین، ایران

چکیده

گدازه‌های بازی تا حد واسط پالئوژن البرز مرکزی، در شمال خاور شهر قزوین، از تراکی-‌آندزیت، تراکی-‌آندزی‌ بازالتی و آندزی ‌بازالتی تشکیل شده‌اند. سنگ‌های منطقه، از لحاظ زمین‌شیمیایی، کلسیمی-قلیایی پرپتاسیم هستند. بالا بودن نسبت‌های LILE/HFSE و LREE/HREE در نمونه‌ها و شباهت ترکیب شیمیایی آنها با گدازه‌هایی که در مناطق شاخص فرورانش تشکیل می‌شوند، احتمال شکل‌گیری سنگ‌های منطقه را در یک محیط فرورانشی تقویت می‌کند. به نظر می‌رسد فرایند فرورانش، تأثیر اندکی در تمرکز عناصر Zr، Ta، Hf، Sm، Tb، Nd، Eu و Y در سنگ‌های منطقه و در عوض تأثیر قابل ملاحظه‌ای در تمرکز عناصر Th، U و تا اندازه‌ای La در نمونه‌ها داشته است. بالا بودن نسبت Ba/La، Ba/Ta و La/Ta و پایین بودن مقدار TiO2 در نمونه‌ها نشان می‌دهد که گدازه‌های منطقه در مناطق کمان ماگمایی تشکیل شده‌اند. پراکندگی نمونه‌ها بر روی نمودارهای Th/Yb در برابر Ta/Yb و همراه بودن آنها با حجم وسیعی از توف‌های اسیدی، نشانه شکل‌گیری گدازه‌‌ها در حاشیه فعال قاره است.

کلیدواژه‌ها


عنوان مقاله [English]

Source and Tectonic Setting of Zarjebostan (NE of Qazvin) Paleogene Volcanic Rocks using REE and HFSE Elements

نویسندگان [English]

  • K. Kalantari 1
  • A. Kananian 1
  • A. Asiabanha 2
  • M. Eliassi 1
1 School of Geology, College of Sciences, University of Tehran, Tehran, Iran
2 Department of Geology, Faculty of Sciences, Imam Khomeini International University, Qazvin, Iran
چکیده [English]

    Paleogene basic to intermediate lava flows of Central Alborz, in the northeast of Qazvin city (Zarjebostan), include trachy-andesite, basaltic trachy-andesite and basaltic andesite. These volcanic rocks are high-K calc-alkaline rocks. Based on the high LILE/HFSE and LREE/HREE ratios and their similar composition to subduction volcanic rock suites; it seems that they have formed in a subduction zone. The subduction process has little effect on the concentration of Zr, Ta, Hf, Sm, Tb, Nd, Eu and Y elements, while it has strong influence on concentration of Th, U and La elements. Due to high Ba/La, Ba/Ta and La/Ta ratios and low TiO2 content of lavas, they could be attributed to magmatic arc setting. Th/Yb vs. Ta/Yb diagrams and association of study suite with extensive volume of acidic tuffs, indicate that these rocks have been formed in an active continental margin.

کلیدواژه‌ها [English]

  • Andesite
  • Subduction
  • Active continental margin
  • Alborz

کلانتری، ک.، 1383- پترولوژی و ژئوشیمی سنگ‌های آتشفشانی منطقه زرجه‌بستان-کجیران (قزوین)، رساله کارشناسی ارشد، دانشکده علوم دانشگاه تهران.

کنعانیان، ع.، کلانتری، ک. و آسیابانها ع. ،1384- روند تحول ماگمایی در روانه‌های استراتوئید شمال شرق زرجه‌بستان، قزوین، ایران. مجله علوم دانشگاه تهران، 31: 65-87.

 

 

References

Aldanmaz, E., Pearce, J.A., Thirlwall, M.F. & Mitchell, J.G., 2000- Petrogenetic evolution of late Cenozoic, post-collision volcanism in western Anatolia, Turkey. Journal of Volcanology and Geothermal Research, 102: 67-95.

Annells, R.N., Arthurton, R.S., Bazely, R.A. & Davies, R.G., 1975- Explanatory text of the Qazvin and Rasht Quadrangles Map 1:250000. GSI., 108p.

Fan, W.M., Gue, F., Wang, Y.J. & Lin, G., 2003- Late Mesozoic calc-alkaline volcanism of post-orogenic extention in the northen Da Hinggan Mountains, northeastern China. Journal of Volcanology and Geothermal Research. 121: 115-135.

Gorton, M.P. & Schandl, E.S., 2000- From continents to island arcs: a geochemical index of tectonic setting for arc – related and within – plate felsic to intermediate volcanic rocks. The Canadian Mineralogist, 38: 1065-1073.

Green, N.L., 2006- Influence of slab thermal structure on basalt source regions and melting conditions: REE and HFSE constraints from Garibaldi volcanic belt, northern Cascadia subduction system. Lithos, 87: 23-49.

Green, T.H.&Pearson, N.J., 1986- Ti – rich accessory phase saturation in hydrous mafic – felsic compositions at high P, T. Chemical Geology, 54: 185-201.

Hermann, J., Spandler, C., Hack, A. & V. Korsakov, A., 2006- Aqueous fluids and hydrous melts in high-pressure and ultra-high pressure rocks: Implications for element transfer in subduction zones. Lithos.

Hole, M.J., Saunders, A.D., Marriner, G.F. & Tarney, J., 1984- subduction of pelagic sediments: implication for the origin of Ceanomalous basalts from AlexanderIslands. Journal of Geological Society of London, 141: 453-472.

Irvine, T.N. & Baragar, W.R.A., 1971- A guide to the chemical classification of the common volcanic rocks. Can. J. Earth. Sci., 8: 523-548.

Juteau, T. & Maury,  R., 1997- Geologie de la Croute Oceanique: Petrologie et Dynamique Endogenes, 569p.

Krauskopf,  K.P. & Bird, D.K. , 1976- Introduction to geochemistry. Mc Graw Hill, 788p.

Le Maitre, R.W., Bateman, P., Dudek, A., Keller, J., Lameyre LeBas, M.J., Sabine, P.A., Schmid, R., Sorenson, H., Streckeisen, A., Woolley, A., & Zanettin, B., 1989- A classification of igneous rocks and glossary of terms. Blackwell Science, Axford. 193p.

Macdonald, R., Hawkesworth, C.J. & Heath, E., 2001- The Lesser Antilles volcanic chain: a study in arc magmatism. Earth-Science Reviews. 49: 1-76.

Machado, A., Lima, E.F., Chemale Jr., F., Morata, D., Oteiza, O., Almeida, D.P.M., Figueiredo, A.M.G., Alexandre, F.M. & Urrutia, J.L., 2005- Geochemistry constrains of Mesozoic – Cenozoic calc – alkaline magmatism in South Shetland arc, Antarctica. Journal of South American Earth Sciences. 18: 407-425.

Middlemost, E.A.K., 1985- Magmas and magmatic rocks. Longman. 440p.

Moghazi, A.M., 2003- Geochemistry and petrogenesis of a high-K calc-alkaline Dokhan Volcanic suite, South Safaga area, Egypt: the role of late Neoproterozoic crustal extention. Precambrian Research. 125: 161-178.

Mohamed, F.H., Moghazi, A.M. & Hassanen, M.A., 2000- Geochemistry, petrogenesis and tectonic setting of late Neoproterozoic Dokhan-type volcanic rocks in the Fatira area, eastern Egypt. International Journal of Earth Science, 88: 764-777.

Pearce, J.A., 1982- Trace element characteristics of lavas from destructive plate boundaries. In: Thorpe, R.S. (eds.) Andesites: orogenic andesites and related rocks, 525-48. Chichester: Wiley.

Pearce, J.A., 1983- Role of the sub-continental lithosphere in magma genesis at active continental margins. In: Hawkesworth C.J. & Norry M.J., (eds.), Continental basalts and mantle xenoliths. Shiva, Nantwich, 230-249.

Pearce, J.A. & Cann, J.R., 1973- Tectonic setting of basic volcanic rocks determined using trace element analysis. Earth and Planetary Science Letters, 19: 290-300.

Pearce, J.A. & Peate, D.W., 1995- Tectonic implications of the composition of volcanic arc magmas. Annual Review Earth and Planetary Science Letters 23: 251-285.

Rendeng, S., Jingsui, Y., Cailai, W., Iizuka, T. & Hirata, T., 2006-Island arc volcanic rocks in the north Qaidam UHP belt, northern Tibet plateau: Evidence for ocean–continent subduction preceding continent–continent Subduction. Journal of Asian Earth Sciences. 28: 151-159.

Righter, K. & Rosas-Elguera, J., 2001- Alkaline lavas in the volcanic front of Western Mexican Volcanic Belt: Geology and Petrology of Ayulta and Tapalpa Volcanic Fields. Journal of Petrology, 42: 2333-2361.

Ryerson, F.J. & Watson, E.B., 1987- Rutile saturation in magmas: implications for Ti-Nb-Ta depletion in island arc basalts. Earth and Planetary Science Letters, 86: 225-239.

Saunders, A.D., Tarney, J. & Weaver, D., 1980- Transverse geochemical variations across the AntracticPeninsula: implications for the genesis of calcalkline magmas. Earth and Planetary Science Letters, 46: 344-360.

Shelley, D., 1993- Igneous and metamorphic rocks under the microscope. Chapman and Hall, 630p.

Singer, S.B., Pearce, H.T., Kolisnik, M.A. & Myers, D.J., 1993- Plagioclase zoning in mid-Pleistocene lavas from the Seguam volcanic center, central Aleutian arc, Alaska. American Mineralogist, 78: 143-157.

Stalder, P., 1971- Magmatism tertiarie et subrecent entre Talegan et Alamout, Elbourz central (Iran): Schweiz. Min. Petr. Mitt. 51: 2-138.

Stocklin, J., 1968- Structural history and tectonics of Iran: a review. Amer. Assoc. Petroleum Geol. Bull. 52: 1229-1258.

Sun, S.S. & McDonough, W.F., 1989- Chemical and isotopic ystematics of oceanic basalts: implications for mantle composition and processes, In: Saunders, A.D. & Norry M.J. (eds) Magmatism in ocean basins. Geological Society, London, Spec. Pub. 42: 313-345.

Tatsumi, Y. & Eggins, S., 1995- Subduction Zone Magmatism. Blackwell Science, Cambridge, MA. 211p.

Tatsumi, Y., Hamilton, D.L. & Nesbitt, R.W., 1986- Chemical characteristics of fluid phase released from a subducted lithosphere and origin of arc magmas: evidence from high pressure experiment and natural rocks. Journal of Volcanology and Geothermal Research. 29: 293-309.

Trumbull, R.B., Wittenbrink, R., Hahne, K., Emmermann, R., Busch, W., Gerstenberger, H. & Siebel, W., 1999- Evidence for Late Miocene to Recent contamination of arc andesites by crustal melts in the Chilean Andes (25-26°S) and its geodynamic implications. Journal of South American Earth Science. 12: 135-155.

Wilson, M., 1989- Igneous Petrogenesis: A Global Tectonic Aproach. Unwin Hyman. London. 466p.

Winter, J.D., 2001- An introduction to Igneous and Metamorphic Petrology. Prentice Hall. 697p.

Wood, D. A., 1980- The application of a Th-Hf-Ta diagram to problems of tectonomagmatic classification and to establishing the nature of crustal contamination of basaltic lavas of the British Tertiary volcanic province. Earth Science. 50: 11-30.

Zanetti, A., Mazzucchelli, M., Rivalenti, G. & Vannuci, R., 1999- The Finero phlogopite-peridotite massif: an example of subduction-related metasomatism. Contributions to Mineralogy and Petrology. 134: 107-122.