Presence of Rudist Bearing Limestone Blocks Derived from The Arabian Platforms in Gevaş (Van) Ophiolite

Yıl 1992, Cilt: 114 Sayı: 114, 75 - 82, 01.07.1992

Sacit Özer

Öz

The Gevaş
ophiolite consists of ultramafic rocks, gabros, lavas, tuffs, cherts, shales,
and it contains also limestone blocks. The majority of these limestone blocks
are unfossiliferous. The fossiliferous limestones are observed only around İkizler
and Dilmetaş villages. The sandy limestones cropping out near İkizler village
have rare fossil such as rudists, gastropods, and some coral fragments.
However, the limestone block of Dilmetaş village contain a rich macrofauna
consisting of rudist, gastropods, lamellibranchs and corals. The rudist fauna
consist of Dictyoptychus cf. euphratica, Dictyoptychus sp., Hatayia sp., Hippurites
syriaca, Hippurites comucopiae, Vaccinites sp. and Sabinia sp. indicating a
Maestrichtian age. The rudist forms are characteristic for the Arabian platform
and they show a distribution in southeastern Anatolian region, Iran, Syria and
Oman Peninsula. The biogeographic characteristics of the rudists suggest that
the fossiliferous limestone blocks of Gevaş ophiolite were derived from the
Maestrichtian units of the Arabian platform.

Anahtar Kelimeler

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Kaynakça

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