Geochemistry and petrology of theSolhan (Bingöl) volcanics, EasternAnatolia, Turkey

Oyan, Vural
Özdemir, Yavuz
Keskin, Mehmet
Güleç, Nilgün Türkan
Late Miocene to Pliocene basaltic volcanism in the Solhan region (city of Bingöl) began after the continentcontinent collision between the Arabian and Eurasian plates. Our K-Ar dating results indicate that the aforementioned magmatic activity existed in that part of the region between 6 and 3.5 Ma. The Solhan basaltic lavas consist of olivine, augite, titanoaugite and plagioclase phenocrysts and microphenocrysts. The groundmass of these lavas contains the microcrystals of the same mineral assemblages set in a volcanic glass matrix. They display porphyritic, glomeroporphyritic, intersertal and hyalopilitic textures. Volcanic products contain alkaline and subalkaline lavas, ranging in compositions from basalts to andesites and trachyandesite. Our EC-AFC model calculations based on Sr, Nd and G18O isotopic compositions suggest that the least evolved basaltic samples were unaffected from the combined processes of fractional crystallization and crustal contamination in contrast to the evolved samples which include 2-6 % crustal assimilation rates. MORB and the primitive mantle normalized pattern of the lavas and isotopic composition imply that alkali and subalkali basalts erupted from the Solhan region could have been derived from a mantle source that had previously been enriched by a clear subduction component. Results of our melting models indicate that the Late Miocene to Pliocene basaltic volcanics in the Solhan region were derived from a mantle source containing spinel, amphibole and garnet with melting degrees ranging between 0.7 and 1%. The percentage of spinel seems to have increased in the lerzolitic mantle source of the basaltic lavas in time. Accordingly, the chemical character of the lavas turned from alkaline to subalkaline in time. We argue that the temporal increase of spinel contribution and the melting degree in the mantle source region was responsible for the temporal transition from alkaline to subalkaline character in lava chemistry.


Geological and Geochemical Evolution of the Quaternary Suphan Stratovolcano, Eastern Anatolia, Turkey: Evidence for the Lithosphere-Asthenosphere Interaction in Post-Collisional Volcanism
Özdemir, Yavuz; Güleç, Nilgün Türkan (Oxford University Press (OUP), 2014-01-01)
The Suphan stratovolcano is one of the major Quaternary eruption centers of post-collisional volcanism in eastern Anatolia, located in the zone of convergence between the Arabian and the Anatolian plates. We document the geological and geochemical evolution of Suphan in terms of volcanostratigraphy, geochronology (Ar-40-Ar-39), isotope composition (Sr, Nd, Pb) and bulk-rock geochemistry. Our new Ar-40-Ar-39 data, along with previously published K/Ar ages, indicate an age of 0 center dot 76-0 center dot 06 M...
Analysis of seismic anisotropy across Central Anatolia by shear wave splitting
Pamir, Dilekcan; Özacar, Atilla Arda; Department of Geological Engineering (2014)
Central Anatolia plays a significant role to connect the theories on the ongoing tectonic escape, the African Plate subduction along Cyprus Arc and the collision of Arabian Plate along Bitlis Suture. On the other hand, the shear wave splitting measurements which characterize the seismic anisotropy are very sparse in the region. The seismic data recorded by national seismic networks with a denser coverage provides a unique opportunity to analyze the effect of present slab geometry (slab tears, slab break-off...
Analysis of Seismic Anisotropy Across Central Anatolia by Shear Wave Splitting
Pamir, Dilekcan; Abgarmi, Bizhan; Özacar, Atilla Arda (2014-04-27)
Central Anatolia holds the key to connect the theories about the ongoing tectonic escape, the African Plate subduction along Cyprus Arc and the indenter-style collision of Arabian Plate along Bitlis Suture. However, the shear wave splitting measurements which are needed to characterize seismic anisotropy are very sparse in the region. Recently, seismic data recorded by national seismic networks (KOERI, ERI-DAD) with dense coverage, provided a unique opportunity to analyze the effect of present slab geometry...
Age and mantle sources of Quaternary basalts associated with "leaky" transform faults of the migrating Anatolia-Arabia-Africa triple junction
Cosca, Michael A.; Reid, Mary; Delphi, Jonathan R.; KUŞCU, GONCA; Blichert-Toft, Janne; Premo, Wayne; Whitney, Donna L.; Teyssier, Christian; Rojay, Fuat Bora (2021-02-01)
The Anatolia (Eurasia), Arabia, and Africa tectonic plates intersect in southeast Turkey, near the Gulf of Iskenderun, forming a tectonically active and unstable triple junction (the A(3) triple junction). The plate boundaries are marked by broad zones of major, dominantly left-lateral transform faults including the East Anatolian fault zone (the Anatolia-Arabia boundary) and the Dead Sea fault zone (the Arabia-Africa boundary). Quaternary basalts occur locally within these "leaky" transform fault zones (si...
Geochemistry and apatite U-Pb geochronology of alkaline gabbros from the Nodoushan plutonic complex, Sanandaj-Sirjan Zone, Central Iran: Evidence for Early Palaeozoic rifting of northern Gondwana
Alavijeh, Badieh Shahsavari; Rashidnejad-Omran, Nematollah; Toksoy Köksal, Fatma; Chew, David; Szopa, Krzysztof; Ghalamghash, Jalil; Gaweda, Aleksandra (2019-07-01)
The Zagros Orogen formed during the Cenozoic collision of Arabia with Eurasia and resulted in the closure of the Neo-Tethys Ocean. Collision was preceded by a complicated tectonic history involving Pan-African orogenesis, Late Palaeozoic rifting and the formation of Neo-Tethys, and subsequent Mesozoic convergence on the northern margin of the ocean contemporaneous with ophiolite obduction on its southern margin. The Sanandaj-Sirjan Zone (SaSZ) is a metamorphic belt within the Zagros Orogen of Gondwanan prov...
Citation Formats
V. Oyan, Y. Özdemir, M. Keskin, and N. T. Güleç, “Geochemistry and petrology of theSolhan (Bingöl) volcanics, EasternAnatolia, Turkey,” presented at the GOLDSSCHMIDT (13 - 18 Ağustos 2017), 2017, Accessed: 00, 2021. [Online]. Available: