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Petrochemistry of the south Marmara granitoids, northwest Anatolia, Turkey

Karacık, Z., Yılmaz, Y., Pearce, Julian A. and Ece, Ö. Işik 2008. Petrochemistry of the south Marmara granitoids, northwest Anatolia, Turkey. International Journal of Earth Sciences 97 (6) , pp. 1181-1200. 10.1007/s00531-007-0222-y

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Post-collision magmatic rocks are common in the southern portion of the Marmara region (Kapıdağ, Karabiga, Gönen, Yenice, Çan areas) and also on the small islands (Marmara, Avşa, Paşalimanı) in the Sea of Marmara. They are represented mainly by granitic plutons, stocks and sills within Triassic basement rocks. The granitoids have ages between Late Cretaceous and Miocene, but mainly belong to two groups: Eocene in the north and Miocene in the south. The Miocene granitoids have associated volcanic rocks; the Eocene granitoids do not display such associations. They are both granodioritic and granitic in composition, and are metaluminous, calc-alkaline, medium to high-K rocks. Their trace elements patterns are similar to both volcanic-arc and calc-alkaline post-collision intrusions, and the granitoids plot into the volcanic arc granite (VAG) and collision related granite areas (COLG) of discrimination diagrams. The have high 87Sr/86Sr (0.704–0.707) and low 143Nd/144Nd (0.5124–0.5128). During their evolution, the magma was affected by crustal assimilation and fractional crystallization (AFC). Nd and Sr isotopic compositions support an origin of derivation by combined continental crustal AFC from a basaltic parent magma. A slab breakoff model is consistent with the evolution of South Marmara Sea granitoids.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Subjects: Q Science > QE Geology
Uncontrolled Keywords: South Marmara region ; Granitoids ; Geochemistry ; Assimilation fractional crystallization (AFC) ; Slab breakoff.
ISSN: 1437-3254
Last Modified: 04 Jun 2017 02:00

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