Geochemical discrimination and petrogenesis of alkalic basalt sequences in part of the Ankara melange, central Turkey

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doi: 10.1144/gsjgs.150.3.0541
Authors:Floyd, P. A.
Author Affiliations:Primary:
University of Keele, Department of Geology, Staffordshire, United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, Vol.150(Part 3), p.541-550. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1993
Note:In English. 49 refs.; illus. incl. strat. col., 1 table, geol. sketch map
Summary:Numerous blocks of low-grade metamorphosed submarine basaltic lavas occur within thrust-bound tectonic units of the Ankara melange. Stable incompatible-element geochemistry indicates that most of these basalts are alkaline of within-plate OIB type. There is a broad chemical overlap between alkaline basalts from within the Triassic Karakaya nappes and the Cretaceous Anatolian nappe (ophiolitic melange). A complete sequence of submarine alkaline basalt lavas was sampled in the Kiliclar section of the Anatolian nappe. These basalts can be divided into three chemical groups that relate to discrete petrographic segments of the lava pile and probably reflect varying degrees of partial melting of a garnet- bearing enriched source. The eruptive environment envisaged involves the moat region of a large seamount; dismemberment of the seamount-related basalts and pelagic sediments took place during subduction of the oceanic crust and their eventual accretion within a fore-arc platform. [R.A.H.]
Subjects:Alkali basalts; Basalts; Cretaceous; Genesis; Geochemistry; Igneous rocks; Lithogeochemistry; Melange; Mesozoic; Nappes; Tectonics; Trace elements; Triassic; Upper Triassic; Volcanic rocks; Ankara Turkey; Asia; Middle East; Turkey; Central Turkey
Coordinates:N395500 N395500 E0330000 E0330000
Abstract Numbers:93M/4442
Record ID:1993016962
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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