Origin and geodynamic evolution of late Cenozoic potassium-rich volcanism in the Isparta area, southwestern Turkey

Elitok, Ömer; Özgür, Nevzat; Drüppel, Kirsten; Dilek, Yıldırım; Platevoët, B.; Guillou, Hervé; Poisson, A.; Scaillet, Stéphane; Satır, Muharrem; Siebel, Wolfgang; Bardintzeff, Jacques-Marie; Deniel, Catherine; Yılmaz, Kamil

doi:10.1080/00206810902951411

Cited by 39 publications

(26 citation statements)

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“…A mantle component with a high 206 Pb/ 204 Pb signature was previously suggested to explain the origin of some strongly potassic rock suites in western Anatolia; however, based on its unradiogenic 87 Sr/ 86 Sr signature (which is referred to as an “intraplate” signature), this component has since been interpreted to reflect an asthenospheric origin with the possible contribution of carbonatitic fluids (Caran, ; Elitok et al, ; Platevoet et al, ; Prelević et al, ). However, no effort has yet been made to explain the highly radiogenic 206 Pb/ 204 Pb signature of this component, which appears to require long‐term isolation from the mantle convection.…”

Section: Heterogeneous Enrichment Of the Lithospheric Mantlementioning

confidence: 99%

“…However, regardless of the type of material involved and the processes envisioned, it has been suggested that subduction‐related metasomatic components share some common isotopic signatures (usually defined as “orogenic” signatures), which are represented by high 87 Sr/ 86 Sr and low 143 Nd/ 144 Nd values (Aldanmaz et al, ; Çoban et al, ; Ersoy & Palmer, ; Prelević et al, , ). On the other hand, melt compositions with distinctly low 87 Sr/ 86 Sr (<0.7040), high 143 Nd/ 144 Nd (>0.5128), and radiogenic 206 Pb/ 204 Pb values (defined as “anorogenic” signatures) have been interpreted to primarily reflect the involvement of melts from the convecting asthenospheric mantle (Dilek & Altunkaynak, ; Elitok et al, ; Ersoy & Palmer, ; Platevoet et al, ; Prelević et al, , ).…”

Section: Introductionmentioning

confidence: 99%

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Some remarks on the nature of mantle metasomatism beneath western Anatolian–Aegean region: Contrasting isotopic signatures recorded in the Miocene lavas from the Söke Basin

2018

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The presence of a subduction signature with variable isotopic patterns in the melt products of mantle origin within the Aegean–Anatolian domain reflects the differential effects of slab‐derived material on the chemical composition of the supraslab mantle region. Here, we use Sr–Nd–Pb isotopic compositions and major and trace element abundances to evaluate the characteristics of the source components and possible roles of fluid/melt metasomatism in the genesis of the Middle to Late Miocene mafic–intermediate lavas from the Söke Basin in western Anatolia. This volcanic suite comprises a number of individual lava flows in which the dominant rock types are potassium‐rich basaltic andesites and andesites with trace element relative abundances indicative of melt derivation from subduction‐modified sources. These samples have significantly heterogeneous Sr and Nd isotopic ratios, with 87Sr/86Sr and 143Nd/144Nd values ranging from 0.70475 to 0.70927 and from 0.51218 to 0.51270, respectively; they also yield a range of Pb isotope ratios, with 206Pb/204Pb = 18.963–19.344, 207Pb/204Pb = 15.672–15.733, and 208Pb/204Pb = 39.096–39.264. Remarkably large variations in isotopic ratios with relatively limited changes in major elements suggest the involvement of heterogeneously enriched sources with diverse isotopic signatures. The modelling of trace element and isotopic data indicates that parts of the lithospheric mantle in this region are isotopically enriched, with geochemical signatures that reflect the interaction of variably depleted mantle peridotites with melts from subducted sediments of continental crustal origin, while other parts host phlogopite‐rich metasomatic components with signatures of devolatilization reactions from ancient subduction events that led to the preferential loss of Pb and Rb to create metasomatic domains with high U/Pb and low Rb/Sr values that ultimately generated highly radiogenic 206Pb/204Pb and relatively unradiogenic 87Sr/86Sr values. The observed isotopic diversity in relatively short‐time‐ and length‐scales may be interpreted to have resulted largely from the variable extent of melt contributions from a number of discrete lithological domains with contrasting long‐term isotopic evolution and is consistent with the view that the continental lithosphere in this region comprises a number of disparate lithospheric fragments with different petrogenetic histories.

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Section: Heterogeneous Enrichment Of the Lithospheric Mantlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Some remarks on the nature of mantle metasomatism beneath western Anatolian–Aegean region: Contrasting isotopic signatures recorded in the Miocene lavas from the Söke Basin

2018

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“…Potassium-rich magmatic rocks occur widely in different tectonomagmatic environments such as continental active margins, post-collisional magmatic arcs and within plate settings (e.g., Muller et al, 1992;Mitchell et al, 1994;Elitok et al, 2010;Eyuboglu, 2010;Lu et al, 2012). It is widely accepted that the late Cenozoic magmatism in the Mediterranean-Iran regions occurred in a post-collisional setting and resulted from partial melting of a subduction-related metasomatized sub-continental lithospheric mantle (e.g., Aldanmaz et al, 2000;Alici Sen et al, 2004;Altunkaynak and Genç, 2008;Altunkaynak et al, 2012;Ersoy et al, 2012a,b;Prelević et al, 2012).…”

Section: Geodynamic Implicationsmentioning

confidence: 99%

“…The temporal distribution of the magmatism in this region shows different phases of magma generation with distinct geochemical signatures mainly in the late Eocene, late Miocene and Plio-Quaternary Eyuboglu et al, 2010Eyuboglu et al, , 2011aEyuboglu et al, ,b,c,d,e, 2012Eyuboglu et al, , 2013a. Mantle-derived volcanic rocks with oceanic-island basalt (OIB)-like geochemical features with and/or without subduction fingerprints are commonly found in the Turkish-Iranian High Plateau (e.g., Aldanmaz et al, 2006;Dilek and Altunkaynak, 2009;Kheirkhah et al, 2009;Elitok et al, 2010;Allen et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Late Miocene K-rich volcanism in the Eslamieh Peninsula (Saray), NW Iran: Implications for geodynamic evolution of the Turkish–Iranian High Plateau

et al. 2014

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a b s t r a c tKeywords: High-K lavas Geochemistry, Sr-Nd-Pb isotopes, Post-collisional magmatism Iran Post-collisional volcanism in northwestern Iran is represented by the Saray high-K rocks including leucite-bearing under-saturated and leucite-free silica saturated rocks. We report Ar-Ar age data which constrain the age as ca. 11Ma (late Miocene). Most of clinopyroxene phenocrysts from the volcanic rocks have complex oscillatory zoning, with high Ti and Al cores, low Ti and high Al mantled clinopyroxenes, grading into low Ti and Al outer rims. All the rocks are highly enriched in incompatible trace elements and have identical Sr-Nd-Pb isotopes. Enrichment in incompatible elements and other geochemical features for the Saray lavas suggest a metasomatized sub-continental lithospheric mantle (SCLM) as the magma source. The negative Nb- Ta Pb isotopic values of the Saray lavas imply the involvement of slab terrigenous sediments and/or a continental lithosphere. Isotopically, the volcanic rocks define a binary trend, representing 5-8% mixing between the primary mantle and sediment melts. Our melting models suggest residual garnet in the source and are incompatible with partial melting of amphibole and/or phlogopite bearing lherzolites, although the complex geochemical features might indicate the result of mixing between melts produced by different sources or a homogenous melt passing through a compositionally-zoned mantle during multiple stages of partial melting and melt migration. The geochronological, geochemical and isotopic data for the Saray rocks suggest that these Late Miocene magmas were derived from a small degree of partial melting of subduction-metasomatized (subcontinental) lithospheric mantle source in a post-collisional setting.

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Basic Concepts of Geochemistry and Composition of Earth Materials

Verma

2019

Road From Geochemistry to Geochemometrics

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Origin and geodynamic evolution of late Cenozoic potassium-rich volcanism in the Isparta area, southwestern Turkey

Abstract: International audienc

Cited by 39 publications

References 106 publications

Some remarks on the nature of mantle metasomatism beneath western Anatolian–Aegean region: Contrasting isotopic signatures recorded in the Miocene lavas from the Söke Basin

Some remarks on the nature of mantle metasomatism beneath western Anatolian–Aegean region: Contrasting isotopic signatures recorded in the Miocene lavas from the Söke Basin

Late Miocene K-rich volcanism in the Eslamieh Peninsula (Saray), NW Iran: Implications for geodynamic evolution of the Turkish–Iranian High Plateau

Basic Concepts of Geochemistry and Composition of Earth Materials

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