Supra-subduction zone ophiolites of central Anatolia; geochemical evidence from the Sarikaraman Ophiolite, Aksaray, Turkey

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Authors:Yaliniz, M. K.; Floyd, P. A.; Goncuoglu, M. C.
Author Affiliations:Primary:
Middle East Technical University, Department of Geological Engineering, Ankara, Turkey
Other:
University of Keele, United Kingdom
Volume Title:Mineralogical Magazine
Source:Mineralogical Magazine, 60(5), p.697-710. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Publication Date:1996
Note:In English. 61 refs.; illus., incl. 1 table, geol. sketch map
Summary:The Central Anatolian Crystalline Complex (CACC), situated between the northern and southern oceanic strands of Neotethys, contain a number of little-studied ophiolitic bodies of late Cretaceous age that have a bearing on the Mesozoic development of this region. The pillow lavas and sheeted dykes of the Sarikaraman Ophiolite were originally a comagmatic differentiated series of vesicular, aphyric and olivine-poor, plagioclase-clinopyroxene phyric tholeiites, but now exhibit greenschist facies assemblages. A set of late dolerite dykes cross-cutting the whole volcanic sequence are more chemically evolved and were probably derived from a different source. Relative to N-MORB the lavas and dykes are enriched in some LIL elements (K, Rb, Cs, U, Th and Sr) and depleted in HFS elements (Nb, Ta, Hf, Zr, Ti and Y) and light REE. In terms of immobile elements the ophiolitic basalts have the broad chemical characteristics of island are tholeiites that were formed in a supra-subduction zone setting, whereas the late dykes are more akin to N-MORB. In this respect the Sarikaraman Ophiolite is similar to other ophiolites found in the eastern Mediterranean region and emphasizes the preservation of this particular environment in the CACC. If all the Central Anatolian Ophiolites (of which the Sarikaraman Ophiolite is one example) were derived via southward thrusting from the Vardar-Izmir-Ankara-Erzincan Ocean branch to the north, age relationships suggest that this segment of ocean crust was relatively short-lived before obduction onto the CACC.
Subjects:Basalts; Cretaceous; Diabase; Dikes; Geochemistry; Igneous rocks; Intrusions; Lava; Mesozoic; Metals; Mid-ocean ridge basalts; Pillow lava; Plutonic rocks; Subduction zones; Tholeiitic dolerite; Trace elements; Volcanic rocks; Anatolia; Asia; Middle East; Turkey; Akasaray Turkey; Sarikaraman Ophiolite
Coordinates:N380000 N400000 E0340000 E0320000
Abstract Numbers:97M/611
Record ID:1997017955
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
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