Geological and Geochemical Evolution of the Quaternary Suphan Stratovolcano, Eastern Anatolia, Turkey: Evidence for the Lithosphere-Asthenosphere Interaction in Post-Collisional Volcanism

Download

index.pdf

Date

2014-01-01

Author

Özdemir, Yavuz
Güleç, Nilgün Türkan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

230
views

0
downloads

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 Ma for the eruptive products, which extend over an area of similar to 2000 km(2). The products of Suphan include transitional mildly alkaline to calc-alkaline lavas, domes and pyroclastic rocks ranging in composition from basalt to rhyolite. MELTS modeling suggests that the majority of the Suphan magmas with SiO2 contents between similar to 57 and similar to 65 wt % are the products of isobaric-isenthalpic mixing of basaltic trachyandesitic and rhyolitic magmas at a crustal pressure of 0 center dot 5 kbar. Energy-constrained assimilation and fractional crystallization modeling of trace element and isotope compositions points to 2-10% (upper) crustal contamination that accompanied differentiation. Large ion lithophile element enrichment and the presence of negative high field strength element anomalies in primitive mantle-normalized trace element patterns suggest a mantle source that was modified by subducted sediments. Light to heavy and medium to heavy rare earth element ratios and partial melting models suggest the derivation of the eastern Anatolian parental magmas from variable mixing of lithospheric and asthenospheric melts. Unlike the commonly accepted models for post-collisional volcanism that envisage an increasing contribution from asthenospheric melts with time, melting degree and contribution of the lithospheric mantle seem to have increased from Miocene-Pliocene to Quaternary times in eastern Anatolia.

Subject Keywords

Geochemistry and Petrology, Geophysics

URI

https://hdl.handle.net/11511/46070

Journal

JOURNAL OF PETROLOGY

DOI

https://doi.org/10.1093/petrology/egt060

Collections

Department of Geological Engineering, Article

Suggestions

OpenMETU
Core

Crustal velocity structure of Central and Eastern Turkey from ambient noise tomography Warren, Linda M.; Beck, Susan L.; Biryol, C. Berk; Zandt, George; Özacar, Atilla Arda; Yang, Yingjie (Oxford University Press (OUP), 2013-09-01) In eastern Turkey, the ongoing convergence of the Arabian and African plates with Eurasia has resulted in the westward extrusion of the Anatolian Plate. To better understand the current state and the tectonic history of this region, we image crust and uppermost mantle structure with ambient noise tomography. Our study area extends from longitudes of 32 degrees to 44 degrees E. We use continuous data from two temporary seismic deployments, our 2006-2008 North Anatolian Fault Passive Seismic Experiment and th...
Diabase dykes from Bogazkale (Corum), Central Anatolia: Geochemical insights into the geodynamical evolution of the northern branch of Neotethys Balc, Ugur; Sayıt, Kaan (Elsevier BV, 2020-05-01) In the Bogazkale region (Corum, Central Anatolia), pieces of Neotethyan oceanic lithosphere are found in an ophiolitic melange. Within the melange, there are occurrences of isolated diabase dykes that intrude serpentinized and carbonatized ultramafics. The diabases are phaneritic, holocrystalline and equigranular, and consist of plagioclase and hornblende as the main primary mineral phases. They have all undergone low-grade alteration, to varying extents, as reflected by the presence of secondary minerals, ...
Geochemical constraints on the Cenozoic, OIB-type alkaline volcanic rocks of NW Turkey: Implications for mantle sources and melting processes ALDANMAZ, ERCAN; KÖPRÜBAŞI, NEZİHİ; GÜRER, ÖMER FEYZİ; Kaymakcı, Nuretdin; Gourgaud, Alan (Elsevier BV, 2006-01-01) The volcanic province of North-West Turkey contains a number of intra-continental alkaline volcanic eruption sequences formed along the localized extensional basins developed in relation with the Late Cenozoic extensional processes. The volcanic suite comprises the extracted melt products of adiabatic decompression melting of the mantle that are represented by small-volume intra-continental plate volcanic rocks of alkaline olivine basalts and basanites with compositions representative of mantle-derived, pri...
Shear wave splitting along a nascent plate boundary: the North Anatolian Fault Zone Biryol, C. Berk; Zandt, George; Beck, Susan L.; Özacar, Atilla Arda; Adiyaman, Hande E.; Gans, Christine R. (Oxford University Press (OUP), 2010-06-01) P>The North Anatolian Fault Zone (NAFZ) is a transform structure that constitutes the boundary between the Anatolian Plate to the south and the Eurasia Plate to the north. We analysed the properties of the upper-mantle strain field and mantle anisotropy in the vicinity of NAFZ via splitting of SKS and SKKS phases. We used data from the North Anatolian Fault (NAF) passive seismic experiment. This is the first study that analyses the upper-mantle anisotropy in this region and our results indicate that the obs...
Origin and interactions of fluids circulating over the Amik Basin (Hatay, Turkey) and relationships with the hydrologic, geologic and tectonic settings YÜCE, GALİP; Italiano, F.; D'Alessandro, W.; Yalcin, T. H.; YASİN, DİDEM; Gulbay, A. H.; ÖZYURT, NACİYE NUR; Rojay, Fuat Bora; KARABACAK, VOLKAN; Bellomo, S.; Brusca, L.; Yang, T.; Fu, C. C.; Lai, C. W.; Özacar, Atilla Arda; Walia, V. (Elsevier BV, 2014-11-21) We investigated the geochemical features of the fluids circulating over the Amik Basin (SE Turkey-Syria border), which is crossed by the Northern extension of the DSF (Dead Sea Fault) and represents the boundary area of three tectonic plates (Anatolian, Arabian and African plates). We collected 34 water samples (thermal and cold from natural springs and boreholes) as well as 8 gas samples (bubbling and gas seepage) besides the gases dissolved in the sampled waters. The results show that the dissolved gas ph...

Citation Formats

Y. Özdemir and N. T. Güleç, “Geological and Geochemical Evolution of the Quaternary Suphan Stratovolcano, Eastern Anatolia, Turkey: Evidence for the Lithosphere-Asthenosphere Interaction in Post-Collisional Volcanism,” JOURNAL OF PETROLOGY, pp. 37–62, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46070.