SHORT NOTE ON POLYPHASES Pd-Pt-Te MINERALISATIONS WHICH IS DETERMINED IN RUTILE BEARING BERIT METAOPHIOLITE CHROMITITES IN KAHRAMANMARAŞ

Yıl 2007, Cilt: 134 Sayı: 134, 37 - 37, 01.03.2007

Hatice Kozlu Erdal

Öz

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.

Anahtar Kelimeler

Kahramanmaraş, Berit, Metaophiolite, Chromitite, Rutile, Pd-Pt-Te

Kaynakça

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