U-PB ZIRCON GEOCHRONOLOGY, SR-ND ISOTOPE GEOCHEMISTRY, AND PETROGENESIS OF OXIDANT GRANITOIDS AT KEYBARKUH, SOUTHWEST OF KHAF

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SALATI EHSAN; KARIMPOUR MOHAMMAD HASSAN; MALEKZADEH SHAFAROUDI AZADEH; HYDARIAN SHAHRI MOHAMMAD REZA; FARMER LANG; STERN CHUCK

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Journal: JOURNAL OF ECONOMIC GEOLOGY Year:2013 | Volume:4 | Issue:2 Page(s): 285-301

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Title

U-PB ZIRCON GEOCHRONOLOGY, SR-ND ISOTOPE GEOCHEMISTRY, AND PETROGENESIS OF OXIDANT GRANITOIDS AT KEYBARKUH, SOUTHWEST OF KHAF

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Keywords

KEYBARKUHQ2

SUBDUCTIONQ2

OXIDANT SERIES INTRUSIONSQ2

RADIOGENIC ISOTOPEQ2

ZIRCON GEOCHRONOLOGYQ2

Abstract

KEYBARKUH area is located 70 km southwest of Khaf, Khorasan Razavi province. The study area is situated in northeastern Lut block. The rock units in the area are Paleozoic metamorphic rocks and Cretaceous to Tertiary subvolcanic intrusions intruded as dike, stock and batholith, their composition varies from granite to diorite. Based on magnetic susceptibility, the intrusive rocks are divided into oxidant and reduced series. In this study, the oxidant intrusions are discussed. These intrusions are mostly high-K to shoshonitic and also meta-aluminous type. Their magma formed in SUBDUCTION magmatic arc and they belong to I-type granitoid series. Enrichment of Large Ion Lithophile Elements (LILE) such as Rb, Cs, K, Ba, and Th relative to High Field Stength Elements (HFSE) such as Nb, Zr, and Ti supported the idea. Enrichment of Light Rare Earth Elements (LREE) and depletion of Heavy Rare Earth Elements (HREE) are also typical of SUBDUCTION magmatism. Negative anomalies of Eu/Eu* can be attributed to the presence of residual plagioclase in a mantle source and contamination of magma by reduced continental crust. The amount of Nb>11 ppm, lower ratio of Zr/Nb<2, the initial 87Sr/86Sr isotope ratio (>0.706), initial 143Nd/144Nd (>0.512) and eNd (<-3.5) indicate that magma contaminated by reduced continental crust. Hornblende biotite granodiorite porphyry dated using U-Pb ZIRCON GEOCHRONOLOGY at 43.44 Ma (Middle Eocene). Based on calculated TDM, magma derived from ancient slab with 820 Ma age in the KEYBARKUH area, was affected by the highest continental crust contamination during its ascent.

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PETRO GENESIS OF GRANITOIDS, U-PB ZIRCON GEOCHRONOLOGY, SR-ND PETRO GENESIS OF GRANITOIDS, U-PB ZIRCON GEOCHRONOLOGY, SR-ND ISOTOPIC CHARACTERISTICS, AND IMPORTANT OCCURRENCE OF TERTIARY MINERALIZATION WITHIN THE LUT BLOCK, EASTERN IRAN

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APA: Copy

SALATI, EHSAN, KARIMPOUR, MOHAMMAD HASSAN, MALEKZADEH SHAFAROUDI, AZADEH, HYDARIAN SHAHRI, MOHAMMAD REZA, FARMER, LANG, & STERN, CHUCK. (2013). U-PB ZIRCON GEOCHRONOLOGY, SR-ND ISOTOPE GEOCHEMISTRY, AND PETROGENESIS OF OXIDANT GRANITOIDS AT KEYBARKUH, SOUTHWEST OF KHAF. JOURNAL OF ECONOMIC GEOLOGY, 4(2), 285-301. SID. https://sid.ir/paper/180463/en

Vancouver: Copy

SALATI EHSAN, KARIMPOUR MOHAMMAD HASSAN, MALEKZADEH SHAFAROUDI AZADEH, HYDARIAN SHAHRI MOHAMMAD REZA, FARMER LANG, STERN CHUCK. U-PB ZIRCON GEOCHRONOLOGY, SR-ND ISOTOPE GEOCHEMISTRY, AND PETROGENESIS OF OXIDANT GRANITOIDS AT KEYBARKUH, SOUTHWEST OF KHAF. JOURNAL OF ECONOMIC GEOLOGY[Internet]. 2013;4(2):285-301. Available from: https://sid.ir/paper/180463/en

IEEE: Copy

EHSAN SALATI, MOHAMMAD HASSAN KARIMPOUR, AZADEH MALEKZADEH SHAFAROUDI, MOHAMMAD REZA HYDARIAN SHAHRI, LANG FARMER, and CHUCK STERN, “U-PB ZIRCON GEOCHRONOLOGY, SR-ND ISOTOPE GEOCHEMISTRY, AND PETROGENESIS OF OXIDANT GRANITOIDS AT KEYBARKUH, SOUTHWEST OF KHAF,” JOURNAL OF ECONOMIC GEOLOGY, vol. 4, no. 2, pp. 285–301, 2013, [Online]. Available: https://sid.ir/paper/180463/en

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