Isotopic geochemistry of Rb-Sr, Sm-Nd and 40Ar-39Ar dating of Ghoshchi gabbros, north of Uromiyeh, northwest of Iran
Subject Areas :
Sh.
Shahabi
1
Hadi
Shafaii Moghadam
2
(Damghan University)
Ghasem
Ghorbani
3
Keywords: Ghoshchi gabbros, 40Ar-39Ar dating, Within-plate- magmatism.,
Abstract :
The studied Ghoshchi complex gabbros are located in the north of Uromiyeh city and NW of Central Iran structural zone. These rocks are intruded into the Cadomian basement, and late diabasic, granitic and aplitic dikes crosscut these gabbros. Clinopyroxene and plagioclase are the main minerals of the gabbros. These rocks are characterized by relatively low 87Sr/86Sr (0.703280-0.704343) ratios. Their isotopic signatures indicate a within plate environment for the formation of gabbros and derivation from an enriched mantle source. 40Ar-39Ar dating shows 316.55±1.68 Ma (Carboniferous period) as minimum age and are related to almost early phases of Neotethys opening. The Ghoshchi gabbros are originated more likely from a spinel-garnet lherzolitic mantle source with about 5% partial melting.
ادوای، م.، جهانگیری، ا.، مجتهدی، م. و قلمقاش، ج.، 1388. سنگ‌شناسی و ژئوشیمی باتولیت قوشچی شمال غرب ایران. مجله بلورشناسی و کانی¬شناسی ایران، 4، 716-733.
- ادوای، م. و قلمقاش، ج.، 1389. پتروژنز و سال سنجی رادیومتری U-Pb زیرکن در گرانیت هریس (شمال غرب شبستر) استان آذربایجان شرقی. مجله بلورشناسی و کانی¬شناسی ایران، 4، 633-646.
- اسدپور ، م.، 1379. پترولوژی وژئوشیمی سنگ‌های حدواسط و اولترامافیک ناحیه قوشچی. پایان¬نامه کارشناسی ارشد دانشگاه شهید بهشتی، ایران.
- بهنیا، پ.، 1374. پتروژنز گرانیتوئیدهای ناحیه قوشچی. پایان‌نامه کارشناسی ارشد دانشگاه تهران، ایران.
- جهانگیری، ا.، 1371. بررسی پترولوژی و ژئوشیمیایی گرانیت¬های ناحیه قوشچی. پایان‌نامه کارشناسی ارشد دانشگاه تبریز، ایران.
- خدابنده، ا. و امینی فضل، ا.، 1372.. نقشه زمین‌شناسی 100000/1 تسوج. سازمان زمین‌شناسی ایران.
- خدابنده، ا.، 1372. نقشه زمین‌شناسی 100000/1 سلماس. سازمان زمین‌شناسی ایران.
- شهابی، ش.، 1391، ژئوشیمی، پترولوژی و تعیین سن گرانیت¬های آلکالن (نوع A) و گابروهای منطقه قوشجی، شمال غرب ایران. پایان¬نامه کارشناسی ارشد، دانشگاه دامغان.
- شهابی ش.، شفایی مقدم ه. و قربانی ق.، 1397 ، ژئوشیمی ایزوتوپی Sr-Nd و سن¬سنجی 40Ar-39Ar و Rb-Sr گرانیت¬های نوع A2 قوشچی، شمال ارومیه، شمال باختر ایران. فصلنامه علوم زمین، 107، 27 - 40.
Aldanmaz, E., Pearce, J.A., Thirlwall, M.F. and 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.
Bea, F.,Mazhari, A., Montero, P., Amini, S. and Ghalamghash, J., 2011. Zircon dating, Sr and Nd isotopes, and element geochemistry of the Khalifan pluton, NW Iran: evidence for Variscan magmatism in a supposedly Cimmerian superterrane. Journal of Asian Earth Sciences 40, 172–179.
Berberian, F. and Berberian, M., 1981. Tectono-plutonic episodes in Iran. In: Gupta, H.K., Delany, F.M. (Eds.), Zagros, Hindu Kush, Himalaya. Geodynamic Evolution. American Geophysical Union, Geodynamics Series, 3, 5-32.
Chiu, H.-Y., Chung, S.-L., Zarrinkoub, M.H.,Mohammadi, S.S., Khatib,M.M. and Iizuka, Y., 2013. Zircon U–Pb age constraints from Iran on the magmatic evolution related to Neotethyan subduction and Zagros orogeny. Lithos 162–163, 70–87.
De Paolo, D. J. and Wasserburg, G. J., 1976. Inferences about magma sources and mantle structure from variations of 143Ndr/144 Nd. Journal of Geophysic Research. Letter, 3, 743-746.
Kretz, R., 1983. Symbols for rock-forming minerals. American Mineralogist, 68, 277–79.
McKenzie, D.P. and O’Nions, R.K., 1991. Partial melt distribution from inversion of rare earth element concentrations. Journal of Petrology. 32, 1021– 1091.
McKenzie, D. and O’Nions, R.K., 1995. The source regions of oceanic island basalts. Journal of Petrology, 36, 133–159.
Moghadam, H.S., Ghorbani, G., Khedr, M.Z., Fazlnia, N., Chiaradia, M., Eyuboglu, Y., Santosh, M., Francisco, C.G., Martinez,M.L., Gourgaud, A. and Arai, S., 2014a. Late Miocene K-rich volcanism in the Eslamieh Peninsula (Saray), NW Iran: Implications for geodynamic evolution of the Turkish–Iranian High Plateau. Gondwana Research 26, 1028–1050.
Pearce, J. A. and Norry, M. J., 1979. Petrogenetic implications of Ti, Zr, Y, and Nb variations in volcanic rocks. Contributions to Mineralogy and Petrology. 69(1), 33-47.
Pearce, J. A. and Cann, J. R., 1973. Tectonic setting of basic volcanic rocks determined using trace element analysis. Earth and Planetary Science Letters. 19, 290-300.
Prytulak, J. and Elliott, T., 2007. TiO2 enrichment in ocean island basalts. Earth and Planetary Science Letters. 263, 388-403.
Richard, P., Shimizu, P. and Allegre, J.C., 1976. 143Nd/144Nd, a natural tracer: an implication to oceanic basalt. Earth and Planetary Sciences Letters 31, 269-278.
Saccani, E., Azimzadeh, Z., Dilek, Y. and Jahangiri, A., 2013. Geochronology and petrology of the Early Carboniferous Misho Mafic Complex (NW Iran), and implications for the melt evolution of Paleo-Tethyan rifting in Western Cimmeria. Lithos, 162-163, 264-278.
Safonova, I. Y., Buslov, M. M., Simonov, V. A., Izokh, A. E., Komiya, T., Kurgansgaya, E. V. and Ohno, T., 2011. Geochemistry, petrogenesis and geodynamic origin of basalts from the Katun’ accretionary complex of Gorny Altai (southwestern Siberia). Russian Geology and Geophysics, 52, 421-442.
Shafaii Moghadam H., Li X.H., Ling X.X., Stern R.J., Santos J.F., Meinhold G., Ghorbani Gh. and Shahabi S., .2015. Petrogenesis and tectonic implications of Late Carboniferous A-type and gabbronorites in NW Iran: Geochronological and geochemical constraints. Lithos, 212-215, 266-279.
Shaw, D. M., 1970. Trace element fractionation during anatexis. Geochimica et Cosmochimica Acta, 34, 237-243.
Shervais, J. W., 1982. Ti-V plots and the petrogenesis of modern ophiolitic lavas. Earth and Planetary Science Letters, 59, 101-118.
Stocklin, J., 1968. Structural history and tectonics of Iran: a review. American Association of Petroleum Geologists Bulletin 52, 1229–1258.
Sun, S. S. and McDonough, W. E., 1989. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: Saunders, A.D., Norry, M.J. (Eds.), Magmatism in the Ocean Basins. Geological Society of London. Special Publication. 313-345.
Thompson R.N., 1982. British Tertiary volcanic province. Scottish Journal of Geology, 18, 49-107.
Wilson, M., 1989. Igneous petrogenesis, a global tectonic approach. London (Unwin Hyman).
Zindler, A. and Hart, S. R., 1986. Chemical geodynamics". Annual Review of Earth and Planetary Sciences. 14, 493-571.