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