Source components and magmatic processes in the genesis of Miocene to Quaternary lavas in western Turkey: constraints from HSE distribution and Hf-Pb-Os isotopes

Date

2015-08-01

Author

Aldanmaz, Ercan
Pickard, Megan
Meisel, Thomas
Altunkaynak, Şafak
Sayıt, Kaan
Sen, Pinar
Hanan, Barry B.
Furman, Tanya

Metadata

Show full item record

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

Item Usage Stats

314
views

0
downloads

Hf-Pb-Os isotope compositions and highly siderophile element (HSE) abundance variations are used to evaluate the mantle source characteristics and possible effects of differentiation processes in lavas from western Turkey, where the eruption of Late Miocene to Quaternary OIB-type intraplate mafic alkaline lavas followed pre-Middle Miocene convergent margin-type volcanism. Concentrations of Os, Ir, and Ru (IPGE) in the OIB-type intraplate lavas decrease with fractionation for primitive melts (MgO > 10 wt%), suggesting that these elements reside predominantly in olivine and associated HSE retaining trace phases and behave compatibly during olivine-dominated fractionation. Fractional crystallization trends indicate distinctly lower bulk partition coefficients for IPGE in more evolved lavas, possibly reflecting a change in the fractionating assemblages. Pd and Re in the primitive melts display negative correlations with MgO, demonstrating moderately incompatible behavior of these elements during fractionation, while the significantly scattered variation in Pt against MgO may indicate the effects of micronuggets of a Pt-rich alloy. Os-rich alkaline primary lavas (> 50 ppt Os) exhibit a limited range of Os-187/Os-188 (0.1361-0.1404), with some xenolith-bearing lavas displaying depletions in Os-187/Os-188 (0.1131-0.1232), suggesting slight compositional modification of primitive melts through contamination with highly depleted, Os-rich mantle lithosphere. More radiogenic Os isotope ratios (Os-187/Os-188 > 0.1954) in the evolved lavas reflect contamination of the magmas by high(187)Os/Os-188 crustal material during shallow differentiation. The OIB-type lavas show limited variations in Hf and Pb isotopes with Hf-176/Hf-177 = 0.282941-0.283051, Pb-206/Pb-204 = 18.683-19.091, Pb-207/Pb-204 = 15.57915.646, Pb-208/Pb-204 = 38.550-38.993; Hf-176/Hf-177 ratios correlate negatively with Pb-208*/Pb-206*, suggesting the effects of similar mantle processes on the evolution of time-integrated Th/U and Lu/Hf. These lavas have distinctly higher Hf-176/Hf-177 and lower Pb-208*/Pb-206* than the Early-Middle Miocene lavas of the region, which are interpreted as melts of enriched mantle with an overprint by sediment-derived subduction component. The source region for the OIB-type alkaline melts is interpreted to be a sub-lithospheric reservoir enriched in Hf and Pb isotopes with respect to depleted MORB mantle. Combined evaluation of Hf, Pb, and Os isotopes suggests that the relative enrichment in this domain is related to mixing of ancient oceanic crust with the ambient mantle through long-term plate recycling processes.

Subject Keywords

Geochemistry and Petrology, Geophysics

URI

https://hdl.handle.net/11511/44124

Journal

CONTRIBUTIONS TO MINERALOGY AND PETROLOGY

DOI

https://doi.org/10.1007/s00410-015-1176-x

Collections

Department of Geological Engineering, Article

Suggestions

OpenMETU
Core

Are U-Th Dates Correlated With Historical Records of Earthquakes? Constraints From Coseismic Carbonate Veins Within the North Anatolian Fault Zone KARABACAK, VOLKAN; Uysal, I. Tonguc; MUTLU, HALİM; Unal-Imer, Ezgi; Dirik, R. Kadir; Feng, Yue-xing; AKISKA, SİNAN; Aydogdu, Ismail; Zhao, Jian-xin (American Geophysical Union (AGU), 2019-07-01) U-Th dating of carbonate veins in connection with active tectonics has recently been used as an attractive tool for constraining the absolute timing of late Quaternary crustal deformations. In this study, for the first time we correlate U-Th ages of travertine deposits in coseismic fissures along the North Anatolian Fault Zone with records of paleoseismological studies supported by historical earthquake catalogued data. U-Th ages are assessed in relation to the recurrence interval and the size and epicenter...
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...
Evaluation of Site Response with Alternative Methods: A Case Study for Engineering Implications Sisman, Fatma Nurten; Askan Gündoğan, Ayşegül; Asten, Michael (Springer Science and Business Media LLC, 2018-01-01) In this paper, efficiency of alternative geophysical techniques for site response is evaluated in two sedimentary basins on the North Anatolian Fault Zone. For this purpose, fundamental frequencies of soils and corresponding amplitudes obtained from empirical horizontal-to-vertical spectral ratio curves from microtremors, weak motions and strong motions are compared with results from one-dimensional theoretical transfer functions. Theoretical transfer functions are computed using S-wave velocity profiles de...
Hydrogeochemical outline of thermal waters and geothermometry applications in Anatolia (Turkey) Mutlu, Halim; Güleç, Nilgün Türkan (Elsevier BV, 1998-10-01) The chemical compositions of a total of 120 thermal water samples from four different tectonically distinct regions (Central, North, East and West Anatolia) of Turkey are presented and assessed in terms of geothermal energy potential of each region through the use of chemical geothermometers. Na-Ca-HCO3, type waters are the dominant water types in all the regions except that Na-Cl type waters are typical for the coastal areas of West Anatolia and for a few inland areas of West and Central Anatolia where dee...
Sensitivity Study of Hydrodynamic Parameters During Numerical Simulations of Tsunami Inundation Ozer, Ceren; Yalçıner, Ahmet Cevdet (Springer Science and Business Media LLC, 2011-11-01) This paper describes the analysis of a parameter, "hydrodynamic demand,'' which can be used to represent the potential for tsunami drag force related damage to structures along coastlines. It is derived from the ratio of drag force to hydrostatic force caused by a tsunami on the structure. It varies according to the instantaneous values of the current velocities and flow depths during a tsunami inundation. To examine the effects of a tsunami in the present study, the analyses were performed using the tsunam...

Citation Formats

E. Aldanmaz et al., “Source components and magmatic processes in the genesis of Miocene to Quaternary lavas in western Turkey: constraints from HSE distribution and Hf-Pb-Os isotopes,” CONTRIBUTIONS TO MINERALOGY AND PETROLOGY, pp. 0–0, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/44124.