7 results on '"AYDIN, Faruk"'
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2. Magma Interaction Processes Inferred from Fe-Ti Oxide Compositions in the Dölek and Sarıçiçek Plutons, Eastern Turkey.
- Author
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Karsli, Orhan, Aydin, Faruk, Uysal, Brahim, and Sadiklar, M. Burhan
- Subjects
- *
MAGNETITE , *HEMATITE , *IGNEOUS intrusions , *GEOLOGY , *TEMPERATURE measurements , *MAGMAS , *STRUCTURAL geology , *SEDIMENTS - Abstract
Magnetite-ulvospinel and ilmenite-hematite solid solution intergrowths from the high-K calc-alkaline Dolek and Saricicek plutons, Eastern Turkey, were investigated using microprobe analyses. Compositions of twenty-eight samples from the host rocks and their enclaves in the plutons were used to estimate the oxygen fugacity and temperature. The ilmenite and ulvospinel component exsolves out along certain preferred crystallographic planes in the titanomagnetite of the host rocks, while they are always absent in those of the mafic microgranular enclaves. The titanomagnetite and ilmenite show variations as Mt98-70Usp02-30 and Ilm99-65Hm01-35 in composition, respectively. Estimations of oxygen fugacity and temperature using the titanomagnetite-ilmenite thermometry/oxygen barometry range from logfO2 of -15.30 to -20.48 in host rocks, logfO2 of -15.39 to -20.80 in the mafic microgranular enclaves and 617±6 to 758±23 °C in host rocks, 622±6 to 735±24 °C in the mafic microgranular enclaves, possibly indicating crystallisation temperature. Applying magnetite-ilmenite thermometry/oxygen barometry to the granitoid rocks also involves microprobe analyses of ilmenite lamellae in titanomagnetite and this method yielded mean temperatures of 679±18 °C. The specific forms and chemical properties of Fe-Ti oxides, and similarities in crystallization temperature and oxygen fugacity of the host rocks and the mafic microgranular enclaves (MME) obtained from the Fe-Ti oxide pairs imply that thermal equilibrium probably occurred between two contrasted magmas, which mixed in various proportions so that possibly a felsic and a more mafic magma interaction occurred in a convectively dynamic magma chamber during crystallization of the plutons. Probably, underplating may be responsible for genesis of the hybrid plutons. Thus, for mixing of coeval magmas derived from a lithospheric upper mantle (mafic end-member) and lower crust (felsic end-member), a thermal anomaly should be supplied. Upwelling of hot asthenospheric material results in thermal perturbation and melting of lithospheric mantle. Intrusion of hot lithospheric mantle-derived mafic magma then induced lower crustal melting, producing felsic melt. Mixing of the lower crust-derived melt and lithospheric mantle-derived magma formed the hybrid plutons. This process requires a post-collisional extensional tectonic setting during the Eocene in the Eastern Pontides. [ABSTRACT FROM AUTHOR]
- Published
- 2008
3. Geochemical and Sr–Nd–Pb isotopic compositions of the Eocene Dölek and Sariçiçek Plutons, Eastern Turkey: Implications for magma interaction in the genesis of high-K calc-alkaline granitoids in a post-collision extensional setting
- Author
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Karsli, Orhan, Chen, Bin, Aydin, Faruk, and Şen, Cüneyt
- Subjects
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IGNEOUS rocks , *ROCKS , *ALBITITE , *ALKALIC igneous rocks , *ANDESITE - Abstract
Abstract: The major and trace elements and Sr–Nd–Pb isotopes of the host rocks and the mafic microgranular enclaves (MME) gathered from the Dölek and Sariçiçek plutons, Eastern Turkey, were studied to understand the underlying petrogenesis and geodynamic setting. The plutons were emplaced at ∼43 Ma at shallow depths (∼5 to 9 km) as estimated from Al-in hornblende geobarometry. The host rocks consist of a variety of rock types ranging from diorite to granite (SiO2 =56.98–72.67 wt.%; Mg#=36.8–50.0) populated by MMEs of gabbroic diorite to monzodiorite in composition (SiO2 =53.21–60.94 wt.%; Mg#=44.4–53.5). All the rocks show a high-K calc-alkaline differentiation trend. Chondrite-normalized REE patterns are moderately fractionated and relatively flat [(La/Yb) N =5.11 to 8.51]. They display small negative Eu anomalies (Eu/Eu⁎ =0.62 to 0.88), with enrichment of LILE and depletion of HFSE. Initial Nd–Sr isotopic compositions for the host rocks are ε Nd(43 Ma)=−0.6 to 0.8 and mostly I Sr =0.70482–0.70548. The Nd model ages (T DM) vary from 0.84 to 0.99 Ga. The Pb isotopic ratios are (206Pb/204Pb)=18.60–18.65, (207Pb/204Pb)=15.61–15.66 and (208Pb/204Pb)=38.69–38.85. Compared with the host rocks, the MMEs are relatively homogeneous in isotopic composition, with I Sr ranging from 0.70485 to 0.70517, ε Nd(43 Ma) −0.1 to 0.8 and with Pb isotopic ratios of (206Pb/204Pb)=18.58–18.64, (207Pb/204Pb)=15.60–15.66 and (208Pb/204Pb)=38.64–38.77. The MMEs have T DM ranging from 0.86 to 1.36 Ga. The geochemical and isotopic similarities between the MMEs and their host rocks indicate that the enclaves are of mixed origin and are most probably formed by the interaction between the lower crust- and mantle-derived magmas. All the geochemical data, in conjunction with the geodynamic evidence, suggest that a basic magma derived from an enriched subcontinental lithospheric mantle, probably triggered by the upwelling of the asthenophere, and interacted with a crustal melt that originated from the dehydration melting of the mafic lower crust at deep crustal levels. Modeling based on the Sr–Nd isotope data indicates that ∼77–83% of the subcontinental lithospheric mantle involved in the genesis. Consequently, the interaction process played an important role in the genesis of the hybrid granitoid bodies, which subsequently underwent a fractional crystallization process along with minor amounts of crustal assimilation, en route to the upper crustal levels generating a wide variety of rock types ranging from diorite to granite in an extensional regime. [Copyright &y& Elsevier]
- Published
- 2007
- Full Text
- View/download PDF
4. Elemental and Sr–Nd–Pb isotopic geochemistry of the most recent Quaternary volcanism in the Erzincan Basin, Eastern Turkey: framework for the evaluation of basalt–lower crust interaction
- Author
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Karsli, Orhan, Chen, Bin, Uysal, Ibrahim, Aydin, Faruk, Wijbrans, Jan R., and Kandemir, Raif
- Subjects
- *
GEOCHEMISTRY , *VOLCANISM , *ISOTOPES - Abstract
Abstract: Whole-rock geochemical and Sr, Nd and Pb isotope data are presented for a representative suite of the Quaternary Erzincan Volcanics (QEV) from the Erzincan basin (EB) along the North Anatolian Fault Zone, aiming to understand their origin and implications for basalt–lower crust interaction. Unspiked K–Ar and 40Ar/39Ar dating of dome lavas from the QEVs yielded ages of 102±2 to 1061±88 ka. The QEVs range from high-K low silica trachy-andesite to rhyolite in composition, with rhyolite volumetrically the most abundant. All rocks show high-K calc-alkaline affinity, a geochemical signature common to many post-collisional magmas. They are characterized by enrichment in LILE (Rb, Ba, K, Th) and LREE ((La/Yb)CN =3–33), with pronounced depletion of HFSE. All lavas show negligible or small negative Eu anomalies in the andesitic to dacitic and strong Eu anomalies in the rhyolitic samples. These rocks have relatively low 87Sr/86Sr=0.70404–0.70587 and slightly depleted Nd isotopic compositions (ε Nd from −0.9 to 2.8), with significantly varied Mg# ranging from 2 to 53. Pb isotopic compositions [206Pb/204Pb=18.90–19.02, 207Pb/204Pb=15.64–15.70, 208Pb/204Pb=38.91–39.97] reveal an enriched source signature, which implies that some portions of metasomatized lithospheric mantle could have contributed to their genesis. The isotopic ratios and chemical features along with the textural and compositional disequilibrium of the plagioclases and amphiboles suggest that mixing of mafic and felsic magmas played an important role in the magma genesis. A possible scenario for the genesis of these volcanic rocks is that basaltic magma formed as a result of partial melting of a subcontinental lithospheric mantle source responding to a possible upwelling of asthenospheric mantle which was caused by the extension produced by strike-slip tectonics. Underplating of these high-temperature basaltic magmas sparked partial fusion of a juvenile lower continental crust producing felsic melts; then magma mixing between basaltic and the felsic magmas followed. Fractional crystallization, with minor amounts crustal contamination could have played an important role in the evolution of magma. Modelling based on Sr and Nd isotope data shows that less than 10% of a basic magma and about 90% of juvenile lower continental crustal material was involved in the generation of the QEVs in a pull-apart basin along the North Anatolian Fault Zone. [Copyright &y& Elsevier]
- Published
- 2008
- Full Text
- View/download PDF
5. Relative Contributions Of Crust And Mantle To Generation Of Campanian High-K Calc-Alkaline I-Type Granitoids In A Subduction Setting, With Special Reference To The Harsit Pluton, Eastern Turkey
- Author
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Ibrahim Uysal, Jan R. Wijbrans, Bin Chen, Faruk Aydin, Orhan Karsli, Raif Kandemir, Abdurrahman Dokuz, Wijbrans, Jan -- 0000-0002-8091-1239, [Karsli, Orhan -- Dokuz, Abdurrahman -- Kandemir, Raif] Gumushane Univ, Dept Geol Engn, TR-29000 Gumushane, Turkey -- [Uysal, Ibrahim] Karadeniz Tech Univ, Dept Geol Engn, TR-61100 Trabzon, Turkey -- [Aydin, Faruk] Nigde Univ, Dept Geol Engn, TR-51200 Nigde, Turkey -- [Chen, Bin] Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China -- [Wijbrans, Jan] Vrije Univ, Lab Isotope Geol, NL-1081 HV Amsterdam, Netherlands, 0-Belirlenecek, and Isotope Geochemistry
- Subjects
Lower crustal melting ,Underplating ,Fractional crystallization (geology) ,High-K calc-alkaline granitoids ,010504 meteorology & atmospheric sciences ,Pluton ,Partial melting ,Geochemistry ,Crust ,engineering.material ,010502 geochemistry & geophysics ,01 natural sciences ,Diorite ,Subduction setting ,Geophysics ,Geochemistry and Petrology ,Eastern Turkey ,engineering ,Back-arc extension ,Mafic ,Geology ,0105 earth and related environmental sciences ,Hornblende ,Radiogenic isotopes - Abstract
WOS: 000282474000001, We present elemental and Sr-Nd-Pb isotopic data for the magmatic suite (similar to 79 Ma) of the Harsit pluton, from the Eastern Pontides (NE Turkey), with the aim of determining its magma source and geodynamic evolution. The pluton comprises granite, granodiorite, tonalite and minor diorite (SiO(2) = 59.43-76.95 wt%), with only minor gabbroic diorite mafic microgranular enclaves in composition (SiO(2) = 54.95-56.32 wt%), and exhibits low Mg# (, Scientific and Technological Research Council of Turkey (TUBITAK) [107Y177, 108Y200], This work was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) with grants # 107Y177 and 108Y200. The authors are also grateful to Durmus Boztug and Hakan Coban for their critical and constructive comments. Ahmet D. Sen and Murat Ketenci are thanked for their enthusiastic assistances during fieldwork.
- Published
- 2010
6. Elemental and Sr-Nd-Pb isotopic geochemistry of the most recent Quaternary volcanism in the Erzincan Basin, Eastern Turkey: framework for the evaluation of basalt-lower crust interaction
- Author
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Raif Kandemir, Orhan Karsli, Faruk Aydin, Ibrahim Uysal, Jan R. Wijbrans, Bin Chen, Wijbrans, Jan -- 0000-0002-8091-1239, [Karsli, Orhan -- Uysal, Ibrahim -- Kandemir, Raif] Karadeniz Tech Univ, Dept Geol Engn, TR-29000 Gumushane, Turkey -- [Chen, Bin] Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China -- [Aydin, Faruk] Nigde Univ, Dept Geol Engn, TR-51200 Nigde, Turkey -- [Wijbrans, Jan R.] Vrije Univ Amsterdam, Lab Isotope Geol, NL-1081 HV Amsterdam, Netherlands, 0-Belirlenecek, and Isotope Geochemistry
- Subjects
Basalt ,Rhyolite domes ,geography ,Underplating ,Felsic ,geography.geographical_feature_category ,Fractional crystallization (geology) ,Basalt-crust interactions ,Quaternary Erzincan Volcanics ,Continental crust ,Geochemistry ,Rhyolites ,Geology ,Sr-Nd-Pb isotopes ,North Anatolian Fault Zone ,Volcanic rock ,Geochemistry and Petrology ,Eastern Turkey ,Igneous differentiation ,SDG 14 - Life Below Water ,Mafic - Abstract
WOS: 000261217200005, Whole-rock geochemical and Sr, Nd and Pb isotope data are presented for a representative suite of the Quaternary Erzincan Volcanics (QEV) from the Erzincan basin (EB) along the North Anatolian Fault Zone, aiming to understand their origin and implications for basalt-lower crust interaction. Unspiked K-Ar and (40)Ar/(39)Ar dating of dome lavas from the QEVs yielded ages of 102 +/- 2 to 1061 +/- 88 ka. The QEVs range from high-K low silica trachy-andesite to rhyolite in composition, with rhyolite volumetrically the most abundant. All rocks show high-K calc-alkaline affinity, a geochemical signature common to many post-collisional magmas. They are characterized by enrichment in LILE (Rb, Ba, K, Th) and LREE ((La/Yb)(CN) = 3-33), with pronounced depletion of HFSE. All lavas show negligible or small negative Eu anomalies in the andesitic to dacitic and strong Eu anomalies in the rhyolitic samples. These rocks have relatively low (87)Sr/(86)Sr = 0.70404-0.70587 and slightly depleted Nd isotopic compositions (epsilon(Nd) from -0.9 to 2.8), with significantly varied Mg# ranging from 2 to 53. Pb isotopic compositions [(206)Pb/(204)Pb = 18.90-19.02, (207)Pb/(204)Pb = 15.64-15.70, (208)Pb/(204)Pb = 38.91-39.97] reveal an enriched source signature, which implies that some portions of metasomatized lithospheric mantle could have contributed to their genesis. The isotopic ratios and chemical features along with the textural and compositional disequilibrium of the plagioclases and amphiboles suggest that mixing of mafic and felsic magmas played an important role in the magma genesis. A possible scenario for the genesis of these volcanic rocks is that basaltic magma formed as a result of partial melting of a subcontinental lithospheric mantle source responding to a possible upwelling of asthenospheric mantle which was caused by the extension produced by strike-slip tectonics. Underplating of these high-temperature basaltic magmas sparked partial fusion of a juvenile lower continental crust producing felsic melts; then magma mixing between basaltic and the felsic magmas followed. Fractional crystallization, with minor amounts crustal contamination could have played an important role in the evolution of magma. Modelling based on Sr and Nd isotope data shows that less than 10% of a basic magma and about 90% of juvenile lower continental crustal material was involved in the generation of the QEVs in a pull-apart basin along the North Anatolian Fault Zone. (C) 2008 Elsevier B.V. All rights reserved., Scientific and Technological Research Council of Turkey (TUBITAK); [104Y041], The financial background of this work was ensured by the Scientific and Technological Research Council of Turkey (TUBITAK) with grant # 104Y041. We would like to thank Rainer Altherr for providing microprobe analyses for this study in the Mineralogical Institute of Heidelberg University. Special thanks are due to M. Cemal Goncuoglu, H. oban and C. Deniel for constructive comments on an early version of this manuscript. Recommendations about the geodynamic evolution of the region from Abdurrahman Dokuz are gratefully acknowledged. Reviews provided by G. Pe-Piper and C. R. Bacon helped improve the quality of paper. Editorial comments by N. Eby are also acknowledged.
- Published
- 2008
7. Magma interaction processes inferred from Fe-Ti oxide compositions in the Dolek and Saricicek plutons, Eastern Turkey
- Author
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Karsli, O., Aydin, F., İBRAHİM UYSAL, Sadiklar, M. B., [Karsli, Orhan] Karadeniz Tech Univ, Dept Geol Engn, TR-29000 Gumushane, Turkey -- [Aydin, Faruk] Nigde Univ, Dept Geol Engn, TR-51200 Nigde, Turkey -- [Uysal, Brahim -- Sadiklar, M. Burhan] Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey, Karsli, O., Karadeniz Technical University, Department of Geological Engineering, TR-29000 Gümüşhane, Turkey -- Aydin, F., Nigde University, Department of Geological Engineering, TR-51200 Nigde, Turkey -- Uysal, I., Karadeniz Technical University, Department of Geological Engineering, TR-61080 Trabzon, Turkey -- Sadiklar, M.B., Karadeniz Technical University, Department of Geological Engineering, TR-61080 Trabzon, Turkey, and 0-Belirlenecek
- Subjects
magma interaction ,Dölek and Sariçiçek plutons ,Eastern Turkey ,magnetite-ilmenite thermometry/oxygen barometry ,Dolek and Saricicek plutons - Abstract
WOS: 000254522100005, Magnetite-ulvospinel and ilmenite-hematite solid solution intergrowths from the high-K calc-alkaline Dolek and Saricicek plutons, Eastern Turkey, were investigated using microprobe analyses. Compositions of twenty-eight samples from the host rocks and their enclaves in the plutons were used to estimate the oxygen fugacity and temperature. The ilmenite and ulvospinel component exsolves out along certain preferred crystallographic planes in the titanomagnetite of the host rocks, while they are always absent in those of the mafic microgranular enclaves. The titanomagnetite and ilmenite show variations as Mt(98-70)Usp(02-30) and Ilm(99-65)Hm(01-35) in composition, respectively. Estimations of oxygen fugacity and temperature using the titanomagnetite-jimenite thermometry/oxygen barometry range from logfO(2) of -15.30 to -20.48 in host rocks, logfO(2) of -15.39 to -20.80 in the mafic microgranular enclaves and 617 +/- 6 to 758 +/- 23 degrees C in host rocks, 622 +/- 6 to 735 +/- 24 degrees C in the mafic microgranular enclaves, possibly indicating crystallisation temperature. Applying magnetite-ilmenite thermometry/oxygen barometry to the granitoid rocks also involves microprobe analyses of ilmenite lamellae in titanomagnetite and this method yielded mean temperatures of 679 +/- 18 degrees C. The specific forms and chemical properties of Fe-Ti oxides, and similarities in crystallization temperature and oxygen fugacity of the host rocks and the mafic microgranular enclaves (MME) obtained from the Fe-Ti oxide pairs imply that thermal equilibrium probably occurred between two contrasted magmas, which mixed in various proportions so that possibly a felsic and a more mafic magma interaction occurred in a convectively dynamic magma chamber during crystallization of the plutons. Probably, underplating may be responsible for genesis of the hybrid plutons. Thus, for mixing of coeval magmas derived from a lithospheric upper mantle (mafic end-member) and lower crust (felsic end-member), a thermal anomaly should be supplied. Upwelling of hot asthenospheric material results in thermal perturbation and melting of lithospheric mantle. Intrusion of hot lithospheric mantle-derived mafic rnagma then induced lower crustal melting, producing felsic melt. Mixing of the lower crust-derived melt and lithospheric mantle-derived magma formed the hybrid plutons. This process requires a post-collisional extensional tectonic setting during the Eocene in the Eastern Pontides.
- Published
- 2008
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