SHORT NOTE ON POLYPHASES Pd-Pt-Te MINERALISATIONS WHICH IS DETERMINED IN RUTILE BEARING BERIT METAOPHIOLITE CHROMITITES IN KAHRAMANMARAŞ
The Pt-Pd bearing mineralisations and rutiles are firstly determined in the transition zone (mohozone) chromitite deposits of the Berit Metaophiolite Massif (BMM) in Kahramanmaraþ in our country with this study. The data of electron microprobe analyses of the chromitites indicate that most of the samples are high-Al chromitites with Cr# numbers between (100xCr/(Cr+Al)) 29-37. The rest of the samples are high-Cr chromitites, with Cr# numbers between 60-70. Microscopic examination and electron microprobe analyses of the PPGE and IPGE- enriched samples reveal platinum-group element minerals (PGM) as euhedral (10-15 µm) inclusions in the chromite grains. The PGM hosted by IPGE-rich high-Cr chromitites are primary inclusions of laurite, irarsite, Ir sulphide and erlichmanite. Very small Pd-Pt telluride phases (merenskyite-moncheite) are hosted by polyphase sulphide droplets in the PPGE-rich chromitites of BMM. Considering the different chemical compositions of both chromitite and PGM at Berit, suggested that their parent melts derived from two different magma sources. The presence of hydrosilicate inclusions and the depletion of compatible elements in high-Cr chromitites of BMM suggested that they resulted from higher degrees of partial melting of the upper mantle, probably from second stage melting of a residual source. The Berit chromitites could have formed both from magmas related to the initial rifting process and to subsequent supra-arc magmatism prior to obduction of the host ophiolite. Because of having in different chemical compositions of the Berit chromitites it has been suggested that they could have generated from both of magmas related with the supra-arc magmatism (SSZ) by partial melting process due to metasomatism of oceanic lithosphere (high-Cr chromitites) and subsequently by changing parent magma composition (the high-Al chromitites) in back arc basin environment.
Keywords:
Kahramanmaraş, Berit, Metaophiolite, Chromitite, Rutile Pd-Pt-Te,
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- Economou-Eliopoulos ve M. Vacondios, I. 1995. Goe- chemistry of Chromitites and Host Rocks from The Pindos Ophiolite Complex, Northwestern Greece, Chemical Geology, 122, 99-108.
- Erdal, H., 2002. Mersin (İçel) Kromitlerine Bağlı Platin Grubu Elementlerin İncelenmesi Çukurova Üni- versitesi, Adana (Doktora tezi), 126 s.
- Garuti, G., Zaccarani, F. ve Economou-Eliopoulos, M. 1999. Paragenesis and Composition of laurite from Chromitites of Othyrys (Greece): Implaca- tions for Os-Ru fractionation in ophiolitic upper mantle of the Balkan Peninsula. Mineralium Deposita, 34, 312-319. Kozlu-Erdal, H., ve Melcher, F., 2006 a. First results on unusual platinum group element&mineral en- richments in the chromitites from the Berit Metaophiolite (Maras), southeastern of Turkey. In: Understanding the genesis of ore deposits to meet the demands of the 21st Century, 12th. Quadrennial IAGOD Symposium, abs. p.35, 21-24 August, 2006,
- ve , 2006b. Berit Metaofiyolit Masifi (Ma- raş) kromititlerindeki sıra dışı platin grubu ele ment ve mineral zenginleşmesine ait ilk bul- gular. II. Ulusal Jeokimya Sempozyumu, Eski- şehir Osmangazi Üniversitesi Mühendislik-Mi marlık Fakültesi Jeoloji Mühendisliği Bölümü, TÜBİTAK-BUTAL Bursa Test ve Analiz Labo- ratuvarı Bildiriler ve Özetler Kitapçığı, s.8, 02-04 Kasım, 2006, Bursa.
- ve Sendir, H., 2006. Geochemistry of the chromitites from Eskişehir (Karaburhan-Mihal- lıccık-Dağküplü) Ophiolites, central Turkey: An investigation of platinum-group elements and minerals. In:Understanding the genesis of ore deposits to meet the demands of the 21st Cen- tury, 12th. Quadrennial IAGOD Symposium, abs. p.34, 21-24 August, 2006, Moscow, Russia
- ve Melcher, F., 2007. Mineralogy and Geoche- mistry of Platinum-Group Element Enrichments in Berit (Maras) Chromitites, Southeastern Tur- key. In: European Geosciences Union General Assembly, pdf, abs., 2007, 15-20 April, Vienna, Austria
- Page, N., Engin, T., Singer, D. A., ve Haffty, J., 1984. Distribution of platinum-group elements in the Batı Kef chromite deposits, Guleman-Elazığ area, eastern Turkey. Economic Geology, 79, 177-184.
- Taşkın, İ., ve Demiray, 1979. Güneybatı Anadolu peri dotitlerindeki platin aramaları, MTA raporu No: 6569 (yayımlanmamış), Ankara.
- Tarkian M., Economou-Eliopoulos M. ve Eliopoulos G. (1992). Platinum Group Minerals and Tet- raauricupride in Ophiolitic Rocks of Skyros Is- land, Greece. Mineralogy and Petrology, 47, 55-66.
- Uçurum, A., Lechler, P.J., ve Larson, L.T., 2000. Platinum-group element distribution in chromite ores from ophiolite complexes, western Turkey, 109, B112-120, Transactions of the Institution of Mining and Metallurgy, reprinted from app- lied earth science, May-August, 2000.
- Yiğitbaş E, 1989. Engizek (K. Maraş) Dağı Civarındaki Tektonik Birliklerin Petrolojik İncelemesi, İstan- bul Üniversitesi Jeoloji Mühendisliği Bölümü, (Doktora tezi).
- ISSN: 0026-4563
- Yayın Aralığı: Yılda 3 Sayı
- Başlangıç: 1950
- Yayıncı: Cahit DÖNMEZ
Sayıdaki Diğer Makaleler
A. Evren ERGİNAL, Ahmet GÖNÜZ, Mustafa BOZCU, A. Suat ATEŞ, Ziya S. ÇETİNER