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The petrology of the Ortakoy district and its ophiolite atthe western edge of the Middle Anatolian Massif, Turkey.

Kocak, K. and Leake, B. E. 1994. The petrology of the Ortakoy district and its ophiolite atthe western edge of the Middle Anatolian Massif, Turkey. Journal of African Earth Sciences 18 (2) , pp. 163-174. 10.1016/0899-5362(94)90028-0

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Abstract

The geological history of a regionally metamorphosed sequence of Silurian on early Devonian sediments, now calcite marbles, quartzites, semipelitic, psammitic and migmatitic gneisses containing K-feldspar, sillimanite, and garnet with later andalusite and cordierite, is outlined with chemical analyses of the rocks and minerals, the latter suggesting peak metamorphic conditions about 600 to 700° C at 4kb. Deposition was in part at an active continental margin and in part probably at a passive margin and was followed by basic intrusions, now amphibolites. Later gabbroic rocks are shown for the first time by their geochemistry, especially REE, to be probably part of a major ophiolite sheet, tectonically emplaced and containing late magmatic or metamorphic hornblende. Later intrusive hornblende diorite, with appinitic (diorite dykes with voluminous euhedral hornblende) and calc-alkaline lamprophyric affinites, immediately preceded the intrusion of voluminous granitoids (granite, tonalite, quartz monzonite) of probably late Cretaceous to Palaeocene age, whose geochemistry indicates a continental volcanic arc setting. Neogene formations completed the rock sequence.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Elsevier
ISSN: 1464-343X
Date of Acceptance: 23 May 1994
Last Modified: 09 Jul 2020 15:15
URI: http://orca.cf.ac.uk/id/eprint/133071

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