A geochemical approach to Neogene-Quaternary volcanic activity of western Anatolia: An example of episodic bimodal volcanism within the Selendi Basin, Turkey

Date

2008-09-30

Author

Ersoy, Y.
Helvaci, C.
Sozbilir, H.
ERKÜL, FUAT
Bozkurt, Erdin

Metadata

Show full item record

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

Item Usage Stats

226
views

0
downloads

New radiometric age and geochemical data are presented from the late Cenozoic volcanic activity in the Selendi Basin of western Anatolia. Stratigraphical and age data show that the volcanism occurred in four distinct stages from the early Miocene to Quaternary. The first early Miocene stage includes two volcanic units with contrasting compositions: the Egreltidag volcanic unit and the Kuzayir lamproite. These volcanic units interfinger with the sedimentary rocks of the early Miocene Hacibekir Group. The Egreltidag volcanic unit consists of high-K calc-alkaline dacitic and rhyolitic lavas and associated pyroclastic rocks, whilst the Kuzayir lamproite is composed of alkaline, ultrapotassic mafic lavas, classified as lamproites. The second volcanic stage during the middle Miocene is also represented by two contrasting volcanic units: the Yagcidag volcanic unit and the Orhanlar basalt. These interdigitate with middle Miocene lacustrine sedimentary rocks of the Inay Group. The Yagodag volcanic unit consists of high-K to shoshonitic and calc-alkaline andesitic lavas and pyroclastic rocks, whilst the Orhanlar basalt is composed of syn-sedimentary mafic lavas of shoshonitic composition. The geochemical features of the early to middle Miocene volcanic rocks indicate a lithospheric mantle source that was most probably amphibole-bearing (not phlogopite) and was metasomatized by fluid-dominated processes during subduction events. The late Miocene volcanic activity in the region consists solely of the alkali basaltic lavas of the Kabaklar basalt. Geochemically these lavas suggest that the effects of subduction zone processes were begun to wane after the late Miocene. Finally, during the Plio-Quaternary, sodic alkaline basaltic volcanic activity occurred in the region, represented by the Kula volcanics. Geochemical characteristics of the Kula volcanics indicate an asthenosphere-dominated mantle source. Melting models for the Miocene lavas show that the mantle source was depleted with time, whilst for the Plio-Quaternary, there was a transition from destructive-continental margin magmatism to intraplate volcanic activity.

Subject Keywords

Western Anatolia, Selendi Basin, Extensional Volcanism, Bimodal Volcanism

URI

https://hdl.handle.net/11511/42828

Journal

CHEMICAL GEOLOGY

DOI

https://doi.org/10.1016/j.chemgeo.2008.06.044

Collections

Department of Geological Engineering, Article

Suggestions

OpenMETU
Core

A sequence stratigraphic approach to the depositional history analysis of the upper eocene sedimentary succession, northwest of the thrace basin, Turkey Sünnetçioğlu, Mehmet Akif; Altıner, Demir; Department of Geological Engineering (2008) This study investigates the depositional history of the Late Eocene sedimentary record in the northwest of the Thrace Basin in a sequence stratigraphic approach and estimates the contribution of regional tectonics, basin physiography and eustasy. Late Eocene sedimentary succession was analyzed in two third-order sequences based on two major data sets; seismic reflection and well data sets. Depositional Sequence-1, represented by progradational stacking patterns, comprises the coarse-grained “Hamitabat” turb...
A reaction-transport-mechanical approach to modeling the interrelationships among gas generation, overpressuring, and fracturing: Implications for the Upper Cretaceous natural gas reservoirs of the Piceance basin, Colorado Payne, DF; Tuncay, Kağan; Park, A; Comer, JB; Ortoleva, P (2000-04-01) Predicting reservoir characteristics in tight-gas sandstone reservoirs, such as those of the Upper Cretaceous units of the Piceance basin, is difficult due to the interactions of multiple processes acting on sediments during basin development. To better understand the dynamics of these systems, a forward numerical model, which accounts for compaction, fracturing, hydrocarbon generation, and multiphase flow (BasinRTM) is used in a one-dimensional simulation of the U.S. Department of Energy's Multiwell Experi...
First Balanced Cross Section Across the Taurides Fold-Thrust Belt: Geological Constraints on the Subduction History of the Antalya Slab in Southern Anatolia McPhee, Peter J.; Altıner, Demir; van Hinsbergen, Douwe J. J. (2018-10-01) Eastern Mediterranean subduction accommodated Africa-Eurasia convergence since Mesozoic time and produced multiple subducted slab fragments in the mantle below Anatolia. These included the north dipping Cyprus and ENE-dipping Antalya slabs, which are currently separated by an upper mantle slab gap. Segmentation of these slabs, and associated mantle flow, may have contributed to <8 Ma uplift of the Central Anatolian Plateau. The western Central Taurides fold-thrust belt in southern Turkey is in the upper pla...
Late Cretaceous extensional denudation along a marble detachment fault zone in the Kirsehir massif near Kaman, central Turkey Lefebvre, Come; Barnhoorn, Auke; van Hinsbergen, Douwe J. J.; Kaymakcı, Nuretdin; Vissers, Reinoud L. M. (2011-08-01) In the Central Anatolian Crystalline Complex (CACC), 100 km scale metamorphic domains were exhumed in a context of north-south plate convergence during late Cretaceous to Cenozoic times. The timing, kinematics and mechanisms of exhumation have been the focus of previous studies in the southern Nigde Massif. In this study, we investigate the unexplored northern area regarding the tectonic features preserved on the edges of the Kirsehir Massif, based on detailed field-mapping in the Kaman area where high-grad...
The Impact of the 4.2 ka BP event in Western Anatolia: an evaluation through palaeoenvironmental and archaeological data Bal, Çağlayan; Pişkin, Evangelia; Department of Settlement Archaeology (2019) Palaeoenvironmental and archaeological research in the eastern Mediterranean and adjacent regions asserts a correlation between the 4.2 ka BP event, an abrupt climatic change (ca. 2200-1900 BC), and societal changes at the end of the 3rd millennium BC. It has been hypothesized that the drought as a result of the event led to social disturbance, conflicts, migrations and in some cases, societal collapses following a breakdown in agriculture and animal husbandry. Similarly, palaeoenvironmental studies provide...

Citation Formats

Y. Ersoy, C. Helvaci, H. Sozbilir, F. ERKÜL, and E. Bozkurt, “A geochemical approach to Neogene-Quaternary volcanic activity of western Anatolia: An example of episodic bimodal volcanism within the Selendi Basin, Turkey,” CHEMICAL GEOLOGY, pp. 265–282, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42828.