Genetic Modeling Of The Şamli (Balıkesir) Iron Deposit

Yılmazer, Erkan
Şamlı Fe-oxide (+Cu±Au) deposit is hosted by Şamlı pluton and rocks of Karakaya Complex in western Anatolia. The pluton consists of both mafic and felsic phases showing magma mixing textures. 40Ar/39Ar geochronology yielded an age range of 23.2±0.5 to 22.42±0.11 Ma for the Şamlı pluton, overlapping with 40Ar/39Ar age of 22.33±0.59 Ma and U-Pb age of 23.34±0.19 Ma from alterations. Sr-Nd isotope data are suggestive of a metasomatized subcontinental lithospheric mantle (SCLM) source for the magma. Alteration-mineralization pattern is defined by a series of overlapping halos characterized by sodic-calcic (plagioclase-pyroxene±scapolite), calcic (garnet-pyroxene±epidote), potassic (biotite+magnetite+chalcopyrite), hematite-limonite, and late stage (chalcedony-calcite+native Cu) alterations. Stable (δ18O, δ34S) and radiogenic (87Sr/86Sr,143Nd/144Nd) isotope compositions suggest a magmatic source for the fluids responsible for alteration-mineralization. Given the spatial-temporal association of alteration- mineralization with magmatic rocks, the hydrothermal system that controls mineralization in Şamlı appears to be linked with emplacement and cooling of Şamlı pluton. Şamlı Fe-oxide (+Cu±Au) deposit has features characteristic for both skarn- and Iron-Oxide-Copper-Gold (IOCG) type deposits. The spatial and temporal association with a porphyritic intrusion, widespread calc-silicate assemblage, metal content (abundant Fe-oxide with high copper content) are similar to calcic Fe-Cu skarns, whereas low-Ti (≤0.05% TiO2) magnetite/hematite, low-S sulfides (chalcopyrite>pyrite), high Cu (up to 6.78%) and moderate Au (up to 8.82 ppm) grades, local structural control in alteration-mineralization, and the derivation of the causative magma from a SCLM resembles the features pertinent to IOCG type mineralization. Therefore, Şamlı deposit is defined as a skarn type Fe-Cu mineralization with a potential for IOCG type deposit.


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Citation Formats
E. Yılmazer, “Genetic Modeling Of The Şamli (Balıkesir) Iron Deposit,” Ph.D. - Doctoral Program, Middle East Technical University, 2012.