Geology, geochemistry, and geochronology of Fe-oxide Cu (+/- Au) mineralization associated with Samli pluton, western Turkey

Yılmazer E., Gulec N., Kuşcu İ., Lentz D. R.

ORE GEOLOGY REVIEWS, cilt.57, ss.191-215, 2014 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 57
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1016/j.oregeorev.2013.10.001
  • Dergi Adı: ORE GEOLOGY REVIEWS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.191-215
  • Anahtar Kelimeler: Western Anatolia, Samli pluton, Mineralization, IOCG, Turkey, OXYGEN-ISOTOPE FRACTIONATION, NORTHWEST ANATOLIA, TECTONIC EVOLUTION, MAGMATIC COMPLEX, CORE-COMPLEX, NW ANATOLIA, VOLCANISM, GRANITOIDS, DEPOSITS, PETROGENESIS
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

The Samli (Balikesir) Fe-oxide Cu (+/- Au) deposit, one of several iron (+ Cu +/- Au) deposits in western Turkey, is hosted by porphyritic rocks of the multi-phase Samli pluton and metapelitic-metadiabasic rocks of Karakaya Complex. Two successive mineralization events are recognized in the area as; i) early magnetite and sulfide and ii) late hematite-goethite-native copper (+/- Au). Alteration associated with the mineralization in Samli is characterized by four distinct mineralogical assemblages. They are, in chronological order of formation, (1) plagioclase-early pyroxene (+/- scapolite), (2) garnet-late pyroxene, (3) chlorite-epidote, and (4) chalcedony-calcite alteration. Geochemical, isotopic (Sr, Nd, O, S) and geochronological (Ar-Ar) data from alteration and magmatic rocks suggest a temporal and genetic link between the multiphase Samli pluton and the hydrothermal system that controls the Fe-oxide-Cu (+/- Au) mineralization. Ar-40/Ar-39 geochronology on hornblende and biotite separates of the Samli pluton yielded an age range between 23.20 +/- 0.50 and 22.42 +/- 0.11 Ma, overlapping with Ar-40/Ar-39 age of 22.34 +/- 0.59 Ma from alteration. The close spatial and temporal associations of Samli mineralization with porphyritic intrusions, pervasive Ca-rich alteration (calcic plagioclase, andraditic garnet, diopsidic pyroxene, scapolite, and epidote) are considered as common features akin to calcic assemblages in typical IOCG deposits. Besides abundant low-Ti (<= 0.5%) magnetite/hematite, high Cu-moderate Au (up to 8.82 ppm) association, structural control and lithologic controls of mineralization, low S-sulfide content (chalcopyrite > pyrite) in the deposit; and the derivation of causative magma from subduction-modified subcontinental lithospheric mantle under a transpressional to transtensional regime, are collectively considered as the features in favor of IOCG-type mineralization for the Swill deposit. (C) 2013 Elsevier B.V. All rights reserved.