 |
| Titel |
Petrology and Geochemistry of Pyroclastic Flow and Phreatomagmatic Deposits in Gölcük Area, Isparta |
| VerfasserIn |
Lutfiye Akin, Efe Akkaş, H. Evren Çubukçu |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250122001
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| Publikation (Nr.) |
 EGU/EGU2016-920.pdf |
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| Zusammenfassung |
| Alkali potassic-ultra potassic magmatism occurs in Gölcük area, Isparta according to the post
collisional extensional tectonic process from late Miocene to Pliocene and Quaternary. The
formation of volcanism can be divided three main stages: (1) ancient trachytic lavas/domes,
(2) initial pyroclastic flow deposits and tephriphonolite lava flows that located at the rim of
the crater (3) pyrolcastic flow deposits, tuff ring deposits, phreatomagmatic deposits and
young domes.
Pumice samples, collected from pyroclastic flow deposits and phreatomagmatic
deposits of Gölcük area, consists of plagioclase (vary from andesine to oligoclase,
normally zoned with calcic cores and more sodic rims), clinopyroxene (vary from
diopside to augite and commonly zoned), amphibole (magnesian hastingsite), biotite
majorly. Oxides and apatites are the accessory phases. Pyroclastic flow deposits and
phreatomagmatic deposits exhibit alkaline major oxide trend with composition range in
trachyte-trachyandesite (SiO2=60-70%). The geochemical data show that all the
samples are potassium rich. These samples are also contain high amount of LILE
and LREE relative to HREE. The abundances of LREE and HREE are variable
(LaN =400-700 and YbN=8-11). LREE/HREE ratios (LaN/YbN=50-65) imply
that they can be derived from a source which is enriched in LREE. The MORB
normalized patterns have shown that samples are enriched in Ba, Sr, K and Rb relative
to Nb and Ti. This is the significant characteristics of island-arc magmas (Ba/Nb
>30).
Keywords: Gölcük, pyroclastic deposits, geochemistry, pumice |
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