TY - JOUR
T1 - Petrogenesis of Miocene volcanism in the Central Anatolia
T2 - Geochemical, isotopic and geochronological evidence
AU - Özdamar, Şenel
AU - Billor, Mehmet Z.
AU - Sarıkaya, Oral
AU - Şans, Bala Ekinci
AU - Yıldız, Taşkın Deniz
AU - Esenli, Fahri
AU - Zou, Haibo
AU - Sherlock, Sarah
AU - Gültekin, Ali Haydar
N1 - Publisher Copyright:
© 2023
PY - 2024/6
Y1 - 2024/6
N2 - This paper presents the first 40Ar/39Ar age data, new bulk-rock major-trace element compositions and Nd[sbnd]Sr isotope geochemistry, combined with detailed geological mapping of Galatia Volcanic Province (GVP) in the northwest Central Anatolia (Turkey). Here, there are voluminous extrusive rocks in a wide compositional range: a basalt, andesite and trachyte suite, and their pyroclastic equivalents. 40Ar/39Ar dating of two whole-rock samples from the GVP yielded plateau ages of 21.76 ± 0.8 Ma and 20.97 ± 0.5 Ma, constrain the volcanic activity at ca. 21 Ma (Aquitanian). The samples show by sub-parallel light rare earth element (LREE)-enrichment and relatively flat heavy rare earth element (HREE) patterns and moderate fractionation [average (La/Yb)N = 13.5]. Their initial 87/86Sr values vary between 0.704619 and 0.704998, while initial 143/144Nd values lie between 0.512673 and 0.512755. Integration of the geochemical and geochronological with geological data we propose that the volcanic rocks in the northern area of GVP with calc-alkaline affinity were produced by a lithospheric mantle magma in an extensional setting.
AB - This paper presents the first 40Ar/39Ar age data, new bulk-rock major-trace element compositions and Nd[sbnd]Sr isotope geochemistry, combined with detailed geological mapping of Galatia Volcanic Province (GVP) in the northwest Central Anatolia (Turkey). Here, there are voluminous extrusive rocks in a wide compositional range: a basalt, andesite and trachyte suite, and their pyroclastic equivalents. 40Ar/39Ar dating of two whole-rock samples from the GVP yielded plateau ages of 21.76 ± 0.8 Ma and 20.97 ± 0.5 Ma, constrain the volcanic activity at ca. 21 Ma (Aquitanian). The samples show by sub-parallel light rare earth element (LREE)-enrichment and relatively flat heavy rare earth element (HREE) patterns and moderate fractionation [average (La/Yb)N = 13.5]. Their initial 87/86Sr values vary between 0.704619 and 0.704998, while initial 143/144Nd values lie between 0.512673 and 0.512755. Integration of the geochemical and geochronological with geological data we propose that the volcanic rocks in the northern area of GVP with calc-alkaline affinity were produced by a lithospheric mantle magma in an extensional setting.
KW - Ar/Ar dating
KW - Central Anatolia
KW - Galatia Volcanic Province
KW - Miocene
KW - Sr-Nd
UR - http://www.scopus.com/inward/record.url?scp=85191433748&partnerID=8YFLogxK
U2 - 10.1016/j.jvolgeores.2024.108086
DO - 10.1016/j.jvolgeores.2024.108086
M3 - Article
AN - SCOPUS:85191433748
SN - 0377-0273
VL - 450
JO - Journal of Volcanology and Geothermal Research
JF - Journal of Volcanology and Geothermal Research
M1 - 108086
ER -