ZIRCON U-PB DATING OF MAHERABAD PORPHYRY COPPER-GOLD PROSPECT AREA: EVIDENCE FOR A LATE EOCENE PORPHYRY-RELATED METALLOGENIC EPOCH IN EAST OF IRAN

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MALEKZADEH SHAFAROUDI A.; KARIMPOUR M.H.

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Journal: JOURNAL OF ECONOMIC GEOLOGY Year:2011 | Volume:3 | Issue:1 Page(s): 41-60

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Title

ZIRCON U-PB DATING OF MAHERABAD PORPHYRY COPPER-GOLD PROSPECT AREA: EVIDENCE FOR A LATE EOCENE PORPHYRY-RELATED METALLOGENIC EPOCH IN EAST OF IRAN

Author(s)

MALEKZADEH SHAFAROUDI A. | KARIMPOUR M.H. | Issue Writer Certificate

Keywords

LUT BLOCKQ2

MIDDLE EOCENEQ2

ZIRCONQ2

GEOCHRONOLOGYQ2

LASER ABLATION ICP-MSQ2

Abstract

Eastern Iran has great potential for porphyry copper deposits, as a result of its past subduction zone tectonic setting that lead to extensive alkaline to calc-alkaline magmatic activity in Tertiary time. Maherabad is the first porphyry Cu-Au prospecting area which is discovered in eastern Iran. This is related to a succession of monzonitic to dioritic porphyries stocks that were emplaced within volcanic rocks. Monzonitic porphyries have basic role in mineralization. Hydrothermal alteration zones are well developed including potassic, sericitic-potassic, quartz-sericite-carbonate-pyrite, quartz-carbonate-pyrite, silicified-propylitic, propylitic, carbonate and silicified zones. Mineralization occurs as Disseminated, stock work and hydrothermal breccia. Based on early stage of exploration, Cu is between 179- 6830 ppm (ave. 3200 ppm) and Au is up to 1000 ppb (ave. 570 ppb). This prospect is gold- rich porphyry copper deposit. Laser-ablation U-Pb dating of two samples from ore-related intrusive rocks indicate that these two monzonitic porphyries crystallized at 39.0±0.8 Ma to 38.2±0.8 Ma, within a short time span of less than ca. 1 Ma during the MIDDLE EOCENE. This provides the first precise ages for metallogenic episode of porphyry-type mineralization. Also, the initial 87Sr/86Sr and (143Nd/144Nd)i was recalculated to an age of 39 Ma. Initial 87Sr/86Sr ratios for monzonitic rocks are 0.7047-0.7048. The (143Nd/144Nd)i isotope composition are 0.512694-0.512713. Initial e Nd isotope values 1.45-1.81. Based on isotopic data the magma had originated beyond the continental crust. The study will be used for tectonic-magmatic setting and evolution of eastern Iran.

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APA: Copy

MALEKZADEH SHAFAROUDI, A., & 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. SID. https://sid.ir/paper/180423/en

Vancouver: Copy

MALEKZADEH SHAFAROUDI A., KARIMPOUR M.H.. 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[Internet]. 2011;3(1):41-60. Available from: https://sid.ir/paper/180423/en

IEEE: Copy

A. MALEKZADEH SHAFAROUDI, and M.H. KARIMPOUR, “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, vol. 3, no. 1, pp. 41–60, 2011, [Online]. Available: https://sid.ir/paper/180423/en

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