Mineral chemistry and pre-eruptive crystallization conditions of Miocene volcanic rocks in the Kütahya (West Anatolia) and surrounding area

Temizel İ., Arslan M., Özkul C., Özburan M.

PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI, sa.4, ss.564-585, 2024 (ESCI) identifier

Özet

The studied Miocene volcanic rocks are observed in the & Ouml;renk & ouml;y, F & imath;nd & imath;kk & ouml;y, and K & imath;z & imath;lkaya Tepe regions in and around the K & uuml;tahya area. The & Ouml;renk & ouml;y volcanic rocks consist of augite basalt, basaltic andesite and andesite, and show hyalo-microlitic porphyritic and cumulophyric texture, and contain plagioclase ( An(70-82) Ab (17-29) Or (1-2) ), clinopyroxene (Wo( 40-44) En( 41-52) Fs( 6-16) ), orthopyroxene (Wo( 1-4) En( 64-71) Fs (27-34) ) olivine (Fo 86-90 ) and Fe-Ti oxide. The F & imath;nd & imath;kk & ouml;y volcanic rocks include augite trachybasalt, augite basaltic trachyandesite and trachyandesite, and show hyalo-microlitic porphyritic and intersertal texture, and generally contain plagioclase (An( 58-88) Ab (12-38 )Or( 1-5 )), clinopyroxene (Wo (44-48) En(3 8- 47)Fs(8-17)), olivine (Fo( 41-63) ) and Fe-Ti oxide, while the andesitic ones also contain biotite. The K & imath;z & imath;lkaya Tepe volcanic rocks contain augite basalt, augite basaltic andesite and trachyandesite, and exhibit hyalomicrolitic porphyritic, vesicular, intersertal and trachytic texture, and include plagioclase (An( 53-85) Ab (14-44 )Or( 0-3) ), clinopyroxene (Wo (39-46) En( 41- 52)Fs(8-16)), orthopyroxene (Wo( 2-3) En( 73-75) Fs (21-25) ), olivine (Fo( 52-82) ) and Fe-Ti oxide. In addition, the pre-eruptive crystallization conditions of the volcanic rocks were estimated using mineral chemistry analyses and thus it was determined that the magmas of the volcanic rocks have evolved by fractionation in magma chambers of the upper continental crust.