The Sungun porphyry magma resource and the 120,000-year difference in age between the main stock and the first dike: New evidence from 87Sr/86Sr, 143Nd/144Nd and Pb, SHRIMP U–Pb zircon dating in NW Iran

Iranian Journal of Earth Sciences

مقاله 2، دوره 9، شماره 2، دی 2017، صفحه 94-104   

نوع مقاله: Original Research Paper

نویسنده

Shohreh Hassanpour^*

Department of Geology, Payame Noor University, Tehran, Iran

چکیده

The Sungun  copper  porphyry deposit is hosted by a Tertiary magmatic complex in  the  Azarbayjan province , northwestern Iran. The  Sungan mine  in its southern and eastern parts is limited  by early Miocene volcanic and by Late Cretaceous limestone rocks in northern and eastern parts respectively . The Sungun  deposit is associated with a suite of porphyritic granitoids and late dikes intruding within Oligo-Miocene andesitic and upper Cretaceous limestone. The Sungun porphyry system developed in multi-stage, central intrusive rocks of the early Miocene age in the Tertiary Arasbaran Magmatic Zone (AMZ). A late post-mineralized dike (DK1a) is the first dike system after the replacement of the Sungun porphyry. It has been dated with a 20.57±0.27 Ma (±2 σ). New zircon SHIRIMP U-Pb data indicates that the Sungun porphyry crystallized within the time span from 20.69±0.37 Ma (±2 σ), and the Sungun porphyry and DK1a represent a near-dated intrusive with an age difference of about 0.12 Ma (120,000 y). Their range of ⁸⁷Sr/⁸⁶Sr  ratios (0.70467 to 0.72278), ¹⁴³Nd/¹⁴⁴Nd ratios (0.51275 to 0.51214), ⁸⁷Rb/⁸⁶Sr (0.67497 to 0.67415 values), lead isotopes ranges from 18.67 to 18.86, 15.65 to 15.66, and 38.93 to 39.06 for the ratios of ²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb, and ²⁰⁸Pb/²⁰⁴Pb respectively, suggest the high contributions of depleted mantle-derived magmas in the generation of Sungun stock, but crustal-contaminated origin for monzonitic body in late magmatic activities in the area. This study shows that the source of the Sungun stocks is categorized in the upper crust, typically similar to the source of porphyry deposits. 

کلیدواژه‌ها

Porphyry copper deposit؛ Sungun؛ Azerbaijan؛ NW Iran