High-K volcanism in the Afyon region, western Turkey: from Si-oversaturated to Si-undersaturated volcanism

Akal, Cüneyt, Helvacı, Cahit, Prelević, Dejan and van den Bogaard, Paul (2013) High-K volcanism in the Afyon region, western Turkey: from Si-oversaturated to Si-undersaturated volcanism International Journal of Earth Sciences, 102 (2). pp. 435-453. DOI 10.1007/s00531-012-0809-9.

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Abstract

Volcanic rocks of the Afyon province (eastern
part of western Anatolia) make up a multistage potassic and ultrapotassic alkaline series dated from 14 to 12 Ma. The early-stage Si-oversaturated volcanic rocks around the Afyon city and further southward are trachyandesitic volcanic activity (14.23 ± 0.09 Ma). Late-stage Si-undersaturated volcanism in the southernmost part of the Afyon volcanic province took place in three episodes inferred from their stratigraphic relationships and ages. Melilite–
leucitites (11.50 ± 0.03 Ma), spotted rachyandesites, tephryphonolites and lamproites (11.91 ± 0.13 Ma) formed in the first episode; trachyandesites in the second episode and finally phonotephrites, phonolite, basaltic trachyandesites and nosean-bearing trachyandesites during the last episode.
The parameter Q [normative q-(ne + lc + kls + ol)] of western Anatolia volcanism clearly decreased southward with time becoming zero in the time interval 10–15 Ma.
The magmatism experienced a sudden change in the extent of Si saturation after 14 Ma, during late-stage volcanic activity of Afyon volcanic province at around 12 Ma, though there was some coexistence of Si-oversaturated and Si-undersaturated magmas during the whole life of Afyon volcanic province.

Document Type: Article
Keywords: Afyon volcanic province ; High-K volcanism ; Western Anatolia ; Lamproite ; Leucitite
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
DOI etc.: 10.1007/s00531-012-0809-9
ISSN: 1437-3254
Date Deposited: 03 Dec 2012 10:14
Last Modified: 18 May 2017 12:52
URI: http://eprints.uni-kiel.de/id/eprint/19440

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