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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 |
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Keywords: | Afyon volcanic province ; High-K volcanism ; Western Anatolia ; Lamproite ; Leucitite |
Research affiliation: | OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS |
Refereed: | Yes |
Open Access Journal?: | No |
Publisher: | Springer |
Date Deposited: | 03 Dec 2012 10:14 |
Last Modified: | 18 May 2017 12:52 |
URI: | https://oceanrep.geomar.de/id/eprint/19440 |
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