期刊
GLOBAL AND PLANETARY CHANGE
卷 80-81, 期 -, 页码 36-50出版社
ELSEVIER
DOI: 10.1016/j.gloplacha.2011.09.007
关键词
Nisyros; Acigol graben; Cardak; Western Anatolia; air-fall tephra; Holocene
资金
- Scientific and Technological Research Council of Turkey (TUBITAK CAYDAG) [106Y043]
- Ankara University [ARFO-2005-07-45-032, AUBAP 09-434-3017]
A27 cm thick, loose tephra deposits has been observed within coarse-grained colluvium at Cardak area of Denizli on the northern apron of the Acigol graben in western Anatolia, Turkey. It is a biotite-rich tephra with mean grain-size of coarse silt. Chemically it is dacite and rhyolite with average of 66.35% SiO2 and 4.70% alcalia (Na2O + K2O) in bulk analyses. It was deposited a time between 5380 +/- 90 and 2395 +/- 65 yrs cal. BP, possibly between 4750 and 3385 yrs cal. BP according to C-14 dating of two palaeosol layers within the colluvium. This is only and the thickest Holocene air-fall tuff layer found in terrestrial sediments in this region so far, and according to present knowledge there is no young volcanic source for such a formation in western Turkey. Analyses and comparisons of the analytic results with those of various young volcanic rocks suggest that the Cardak tephra originated from a volcanic source in the Aegean Sea. Besides, its geochemical composition, formation time and significant thickness represent probably a separate late Holocene explosive eruption in the eastern Mediterranean, apart from the Santorini event. (C) 2011 Elsevier B.V. All rights reserved.
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