MINING GEOLOGY OF THE GOLD OCCURRENCES RELATED TO THE ARSENOPYRITES OF İZMİR-ÖDEMİŞ REGION

Year 2008, Volume: 136 Issue: 136, 1 - 16, 01.05.2008

Sinan Akıska Taner Ünlü , İ. Sönmez Sayılı

Abstract

This study presents the results of the mineralogical, petrographical and geochemical investigations of the gold bearing vein-like arsenopyrite occurrences and mica schist, amphibole schist and amphibolite host rocks cropping out in the close vicinities of Elmacıgediði, Zeytinlik, Yılanlıkale and Kemer regions in the northeast of Ödemiş, İzmir. All investigated areas are located in the Ödemiþ submassif of the Menderes Massif which consist of schists, gneisses and amphibolites. These units are formed under the conditions of medium grade metamorphism. Garnet-biotite-amphibolite, amphibole schists and mica schists crop out in the study area. They are generally rich in biotite and/or muscovite and in some localities garnet. The amphibolites which are formed as lense-like bodies, are more than several hundreds of meters in length and several tens of meters in thickness and are aligned parallel to the schistosity of mica schists. Geochemical analyses have been carried out on 11 selected samples. In the major oxides versus SiO2 diagrams, ores mica schists and amphibolites/amphibole schists plot in different areas. Very high positive correlation coefficients among Au-Ag-Sb-Bi and Se are held from the trace element data of 7 samples taken from Zeytinlik area in statistically evaluation. Ore microscopical studies indicate two different stages for ore mineralizations as syngenetic and postmetamorphic. Mineralizations are formed both related with elements of basic magmatic rocks carried by solutions into the sedimentary basin and afterwards, the elements related with more asidic solutions. Mineralizations are remobilized during and/or after the metamorphism of the region.

Keywords

Menderes Massif, Ödemiş submassif, arsenopyrite, gold, İzmir

References

• İzmir-Ödemiş yöresindeki metamorfik kayaçlar içerisinde bulunan altınlı arsenopirit damarlarının jeolojisi, jeokimyası ve kökeni.
• Andiç, T. 1992. Aydýn-Denizli yöresi altýn aramalarý raporu. MTA Rapor No: 9521. Ankara.
• Aydal, D. 2000. Altýn ve jeolojisi, 82 s., Ankara.
• Çağatay, A. and Eyüpoğlu, T. 1979. Batı Anadolu'daki antimonit-arsenopirit, zinober şeelit yatak ve zuhurlarının mineralojisi, kısa jeoloji inceleme- leri ve elde edilen jenetik bulgular. JMO Bulletin Sayı:9 s. 51-62.
• Dilek, S. and Kayhan, F. 1987. Menderes Masifi Öde- miþ ve Çine asmasifleri arsenopirit mineralizas- yonlarý raporu. MTA Report No: 8261. Ankara. (unpublished).
• Gonca, Þ. 1992. Uþak-Eþme, Manisa-Kula, Manisa ve Uþak yöresinde altýn aramalarý maden jeolojisi raporu. MTA Report No:9520, Ankara (unpub- lished).
• Kayhan, F. 1991. Ödemiþ Asmasifinde (Menderes Ma- sifi) ve yöresindeki altýn mineralizasyonu rapo- ru. MTA Report No:9350. Ankara (unpub- lished).
• Krauskopf, K., B., 1989, Inroduction to Geochemistry, McGRAW-HILL INTERNATIONAL EDITIONS, Earth and Planetary Sciences Series, p.617.
• Kuhns, R. J. 1988. The Golden Giant deposit, Hemlo, Ontario: geologic, and geochemical relation- ships between mineralization, alteration, meta- morphism, magmatism and tectonism. PhD Thessis, Univ Minnesota 381 pp.
• Önal, G., Yüce, A.E. and Karahan, S. 1986. Türkiye'de altýn madenciliði, Yurt Madenciliðini Geliþtirme Vakfý yayýný, 173 s.
• Sawkins, F. J. 1990. Metal deposits in relation to plate tectonics (Second Edition); (çeviri : Ünlü, T. ve Sayýlý, Ý.S., 366 s., 1999, Ankara).
• SNIA TECHINT-RIMIN-GEOEXPERT ITALY, 1991. Hidrometallurjik Yöntemlerin Katkýsýyla Batý Anadolu'da Deðerli Metal ve Nadir Element Metallerinin çýkarýlmasýnda Jeolojik ve Maden- cilik Araþtýrmalarý. MTA Archive.
• Strachan, D. M. and Moffett, R. 1985. Geology of the Lupin gold deposit, N.W.T. Preprint 11 NW Min Assoc 91st Annu Conv, Spokane.
• Sun, S.S. and McDonough, W.F., 1989. Chemical and isotopic systematics of oceanic basalts: impli- cations for mantle composition and processes. In: Saunders A.D. and Norry M.J. (eds.), Magmatism in ocean basins. Geol. Soc. London. Spec. Pub. 42, pp.313-345.
• Uzkut, Ý. 1977. Büyük Menderes-Gediz arasýndaki ar- senopirit yataklarýnýn oluþumu ve altýn-kobalt a- çýsýndan önemi. Doçentlik Tezi, E.Ü.M.B.F., 92s. PLATES