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رضا برآبادی سید احمد مظاهری محمد حسن کریم پور

چکیده

منطقه اکتشافی سیمرغ در مرکز بلوک لوت و جنوب‌غربی نهبندان قرار دارد. در این منطقه طیف گستردهای از توده‌های نیمه‌عمیق به شکل استوک و دایک در درون واحدهای آتشفشانی نفوذ کردهاند و دگرسانیهای مهمی مانند سیلیسی، کوارتز+ سریسیت+ پیریت، کربنات+ کوارتز+ سریسیت+ پیریت، پروپیلیتیک و آرژیلیک را به‌وجود آورده‌اند. این تودهها متا‌آلومینوس با ماهیت کالکآلکالن تا کالکآلکالن پتاسیم بالا هستند. غنیشدگی عناصر LREE نسبت به HREE همراه با آنومالی منفی Eu نشان‌دهنده تشکیل ماگما در زون فرورانش است. سه نوع کانیسازی افشان، رگچهای و برشهای هیدروترمال در این منطقه دیده میشود. میزان عنصر مس از 2 تا 240 گرم در تن، مولیبدن 5/0 تا 49 گرم در تن، آرسنیک 2 تا 207 گرم در تن و طلا 1 تا 93 میلیگرم در تن متغیر است. سن‌سنجی U-Pb در دو دایک گرانیت پورفیری سنهای 56/0±37/25 و 76/0±94/25 میلیون سال و توده پیروکسن دیوریت پورفیری سن 51/0±85/24 میلیون سال را نشان می دهد. مقادير مثبت پایین ɛHf(t) منشأ این توده‌ها را گوشته نشان میدهد که مقدار کمي با پوسته آغشتگي پيدا کرده است.

جزئیات مقاله

کلمات کلیدی

کانی‌ سازی, توده‌ های نیمه‌ عمیق, کالک‌ آلکالن, سن‌ سنجی U-Pb, ایزوتوپ‌ های Lu-Hf, سیمرغ, بلوک لوت

مراجع
Abdi, M. and Karimpour, M.H., 2012. Geology, alteration, mineralization, petrogenesis, geochronology, geochemistry and airborne geophysics of Kuh Shah prospecting area, SW Birjand. Journal of Economic Geology, 4(1): 77–107. (in Persian with English abstract)
Abdi, M. and Karimpour, M.H., 2013. Petrochemical Characteristics and Timing of Middle Eocene Granitic Magmatism in Kooh-Shah, Lut Block, Eastern Iran. Acta Geological Sinica, 87(4): 1032–1044.
Alavi, M., 1991. Tectonic map of the Middle East, Scale 1:2900000. Geological Survey of Iran.
Arjmandzadeh, R., Karimpour, M.H., Mazaheri, S.A., Santos, J.F., Medina, J. and Homam, S.M., 2011. Sr-Nd isotope geochemistry and petrogenesis of the Chah-Shaljami granitoids (Lut Block, Eastern Iran). Journal of Asian Earth Sciences, 41(3): 283–296.
Arjmandzadeh, R. and Santos, J.F., 2013. Sr-Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu-Mo porphyry mineralizing intrusives from Lut Block, eastern Iran. International Journal of Earth Sciences, 103(1): 123–140.
Asiabanha, A., Bardintzeff, J.M., Kananian, A. and Rahimi, G., 2012. Post-Eocene volcanics of the Abazar district, Qazvin, Iran: Mineralogical and geochemical evidence for a complex magmatic evolution. Journal of Asian Earth Sciences, 45(1): 79–94.
Babakhani, A.R., Kholghi, M.H., Zadekabir, H., Chandchi, M., Afsharian Zadeh, A., Jalilian, M., Etemadi, N. and Manouchehri, M., 1988. Geological map of Nakhilab (Ab-e-Sard), Scale 1:250,000. Geological Survey of Iran.
Belousova, E.A., Griffin, W.L., O'Reilly, S.Y. and Fisher, N.I., 2002. Igneous zircon: trace element composition as an indicator of source rock type. Contributions to Mineralogy and Petrology, 143(5): 602–622.
Boynton, W.V., 1984. Geochemistry of the rare earth elements: meteorite studies. In: P. Henderson (Editor), Rare earth element geochemistry. Elsevier, Amsterdam, pp. 63–114.
Chappell, B. and White, A., 2001. Two contrasting granite types: 25 years later. Australian Journal Earth Sciences, 48(4): 489–499.
Edward, C.M.H., Menzies, M.A., Thirlwall, M.F., Morrid, J.D., Leeman, W.P. and Harmon, R.S., 1994. The transition to potassic alkaline volcanism in island arcs: the Ringgite-Beser Complex, East Java. Journal of Petrology, 35(6): 1557–1595.
Gill, R., 2010. Igneous rocks and processes. Wiley-Blackwell, New Jersey, 428 pp.
Griffis, R., Meixner, H., Johns, G., Abedian, N., Behruzi, A., Hossienkhan Nazer, N., Hamzeh Pour, B., Shahriari, S., Sahandi, M.R., Mohajjel, M., Bernerian, M., Soheili, M., Hosseini, Z., Afsharian Zadeh, M. and Chaichi, Z., 1992. Geological map of Dehsalm (Chah Vak), Scale 1:250,000. Geological Survey of Iran.
Gust, D.A., Arculus, R.A. and Kersting, A.B., 1997. Aspects of magma sources and processes in the Honshu arc. The Canadian Mineralogist, 35(2): 347–365.
Helvacı, C., Ersoy, E.Y., Sözbilir, H., Erkül, F., Sümer, Ö. and Uzel, B., 2009. Geochemistry and 40Ar/39Ar geochronology of Miocene volcanic rocks from the Karaburun Peninsula: Implications for amphibolebearing lithospheric mantle source, Western Anatolia. Journal of Volcanology and Geothermal Research, 185(3): 181–202.
Hosseinkhani, A., Karimpour, M.H., Malekzadeh Shafaroudi, A. and Santos, J.F., 2017. U-Pb geochronology and petrogenesis of intrusive rocks: Constraints on the mode of genesis and timing of Cu mineralization in SWSK area, Lut Block. Journal of Geochemical Exploration, 177(1): 11–27.
Karimpour, M.H., Malekzadeh shafaroudi, A., Farmer, G.L. and Stern, C.R., 2012. Petrogenesis of Granitoids, U-Pb zircon geochronology, Sr-Nd Petrogenesis of granitoids, U-Pb zircon geochronology, Sr-Nd isotopic characteristics, and important occurrence of Tertiary mineralization within the Lut block, eastern Iran. Journal of Economic Geology, 4(1): 1–28. (in Persian with English abstract)
Karimpour, M.H., Stern, C.R., Farmer, G.L., Saadat. S. and Malekzadeh shafaroudi, A., 2011. Rb-Sr geochemistry and petrogenesis of Jurassic to Quaternary igneous rocks in Lut Block, Eastern Iran. Geopersia, 1(1): 19–36.
Katongo, C., Koller, F., Klötzli, U., Koeberl, Ch., Tembo, F. and Waele, B., 2004. Petrography, geochemistry, and geochronology of granitoid rocks in the Neoprotrozoic- Paleozoic Lufilian-Zambezi belt, Zambia: Implications for tectonic setting and regional correlation. Journal of African Earth Sciences, 40(5): 219–244.
Malekzadeh Shafaroudi, A. and Karimpour, M.H., 2011. Zircon U-Pb dating of Maherabad porphyry copper-gold prospect area: evidence for a late Eocene porphyry-related metallogenic epoch in east of Iran. Journal of Economic Geology, 3(1): 41–60. (in Persian with English abstract)
Malekzadeh shafaroudi, A., Karimpour, M.H. and Mazaheri, S.A., 2010. Rb-Sr and Sm-Nd isotopic compositions and petrogenesis of ore-related intrusive rocks of gold-rich porphyry copper Maherabad prospect area (North of Hanich), east of Iran. Iranian Journal of Crystallography and Mineralogy, 18(2): 15–32. (in Persian with English abstract)
Malekzadeh shafaroudi, A., Karimpour, M.H. and Stern, C.R., 2015. The Khopik porphyry copper prospect, Lut Block, Eastern Iran. Geology, alteration and mineralization, fluid inclusion, and oxygen isotope studies. Ore Geology Reviews, 65(2): 522–544.
Maniar, P.D. and Piccoli, P.M., 1989. Tectonic discrimination of granitoids. Geological Society of America Bulletin, 101(5): 635–643.
Martin, H., 1999. The adakitic magmas: modern analogues of Archaean granitoids. Lithos, 46(3): 411–429.
Middlemost, E.A.K., 1985. Magmas and Magmatic Rocks. Longman, London, 266 pp.
Miri Beydokhti, R., Karimpour, M.H., Mazaheri, S.A., Santos, J.F. and Klötzlid, U., 2015. U-Pb zircon geochronology, Sr-Nd geochemistry, petrogenesis and tectonic setting of Mahoor granitoid rocks (Lut Block, Eastern Iran). Journal of Asian Earth Sciences, 111(1): 192–205.
Nagudi, N., Koberl, Ch. and Kurat, G., 2003. Petrography and Geochemistry of the sigo granite, Uganda and implications for origin. Journal of African Earth Sciences, 36(1): 1–14.
Pearce, J.A., Harris, N.B.W. and Tindle, A.G., 1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Journal of Petrology, 25(4): 956–983.
Peccerillo, A. and Taylor, S.R., 1976. Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, northern Turkey. Contributions to Mineralogy and Petrology, 58(1): 63–81.
Peters, T.J., Menzies, M., Thirlwall, M. and Kyle, P., 2008. Zuni-Bandera volcanism, Rio Grande, USA-melt formation in garnet- and spinel facies mantle straddling the asthenosphere-lithosphere boundary. Lithos, 102(1–2): 295–315.
Rollinson, H., 1993. Using geochemical data: evolution, presentation, interpretation. Longman Scientific and Technical, London, 248 pp.
Saunders, A.D., Storey, M., Kent, R.W. and Norry, M.J., 1992. Consequences of plume-lithosphere interactions. In: B.C. Storey, T. Alabaster and R.J. Pankhurst (Editors), Magmatism and the Causes of Continental Break-up. Geological Society of London, London, pp. 41–60.
Srivastava, R.K. and Singh, R.K., 2004. Trace element geochemistry and genesis of Precambrian sub alkaline mafic dykes from the central Indian craton: evidence for mantle metasomatism. Journal of Asian Earth Sciences, 23(3): 373–389.
Sun, S.S. and McDonough, W.F., 1989. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: A.D. Saunders and M.J. Norry (Editors), Magmatism in the Ocean Basins. Geological Society of London, London, pp. 313–345.
Tepper, J.H., Nelson, B.K., Bergantz, G.W. and Irving, A.J., 1993. Petrology of the Chilliwack batholith, North Cascades, Washington: generation of calc-alkaline granitoids by melting of mafic lower crust with variable water fugacity. Contributions to Mineralogy and Petrology, 113(3): 333–351.
Walker, J.A., Patino, L.C., Carr, M.J. and Feigenson, M.D., 2001. Slab control over HFSE depletions in Nicaragua. Earth and Planetary Science Letters, 192(4): 533–543.
Whitney, D.L. and Evans, B.W., 2010. Abbreviations for names of rock-forming minerals. American Mineralogist, 95(1):185–187.
Wilson, M., 1989. Igneous Petrogenesis A Global Tectonic Approach. Harper Collins Academic, London, 466 pp.
ارجاع به مقاله
برآبادی ر., مظاهری س. ا., & کریم پور م. ح. (2019). زمین‌ شناسی، کانی سازی، ژئوشیمی اکتشافی، پتروژنز، سن‌ سنجی U-Pb و ایزوتوپ‌ های Lu-Hf روی کانی زیرکن توده های نیمه‌ عمیق در محدوده اکتشافی سيمرغ، بلوک لوت، شرق ايران. زمین‌شناسی اقتصادی, 11(1), 121-145. https://doi.org/10.22067/econg.v11i1.69424
نوع مقاله
علمی- پژوهشی