Geochemical Constraints on the Genesis of the Günyüzü Pluton, Northwest Anatolia, Turkey

The Tavsanli Zone in northwest Turkey is intruded by many Late Cretaceous to Eocene (91-45 Ma) calc-alkaline granitoids, of which the Günyüzü pluton in the Eskisehir region is the least studied. The Günyüzü rocks are high-K, calc-alkaline (I-type) intrusions, and are comprised of diorite, granodiorite, granite, and granite porphyry. Typical minerals are plagioclase, K-feldspar, quartz, biotite, hornblende and Fe-Ti oxides. Chondrite-normalized REE patterns for the Günyüzü rocks are moderately fractionated and have small negative Eu anomalies. They are enriched in LILE and LREE relative to HFSE, showing characteristics of arc-related granitoids. Low values of molar K2O/Na2O, Al2O3/(FeO+MgO+TiO2), and (Na2O+K2O)/(FeO+MgO+TiO2) ratios demonstrate that the Günyüzü magma(s) were produced from mafic lower crustal rocks.

[1]  N. Ilbeyli,et al.  Petrogenesis of the Late Cenozoic Egrigöz Pluton in Western Anatolia, Turkey: Implications for Magma Genesis and Crustal Processes , 2008 .

[2]  D. Whitney,et al.  Petrogenesis and structural petrology of high-pressure metabasalt pods, Sivrihisar, Turkey , 2008 .

[3]  A. Okay,et al.  Geochronology of Eocene plutonism and metamorphism in northwest , 2006 .

[4]  V. Isik,et al.  The 40Ar/39Ar age of extensional ductile deformation and granitoid intrusion in the northern Menderes core complex: implications for the initiation of extensional tectonics in western Turkey , 2004 .

[5]  E. Aldanmaz,et al.  Geochemical Constraints on the Petrogenesis of Cenozoic I-Type Granitoids in Northwest Anatolia, Turkey: Evidence for Magma Generation by Lithospheric Delamination in a Post-Collisional Setting , 2004 .

[6]  A. Önen.  Neotethyan ophiolitic rocks of the Anatolides of NW Turkey and comparison with Tauride ophiolites , 2003, Journal of the Geological Society.

[7]  Y. Yılmaz,et al.  Two contrasting magmatic associations of NW Anatolia and their tectonic significance , 2001 .

[8]  Aral I. Okay,et al.  Obduction, subduction and collision as reflected in the Upper Cretaceous–Lower Eocene sedimentary record of western Turkey , 2001, Geological Magazine.

[9]  M. Delaloye,et al.  Granitoids from Western and Northwestern Anatolia: Geochemistry and Modeling of Geodynamic Evolution , 2000 .

[10]  L. Jolivet,et al.  The Mediterranean Basins: Tertiary Extension within the Alpine Orogen — an introduction , 1999, Geological Society, London, Special Publications.

[11]  S. Kelley,et al.  40Ar-39Ar and Rb-Sr geochronology of high-pressure metamorphism and exhumation history of the Tavsanli Zone, NW Turkey , 1999 .

[12]  Y. Yılmaz,et al.  The Mount Kozak magmatic complex, Western Anatolia , 1998 .

[13]  Y. Yılmaz,et al.  Geology of the ignimbrites and the associated volcano–plutonic complex of the Ezine area, northwestern Anatolia , 1998 .

[14]  Ş. Genç.  Evolution of the Bayramiç magmatic complex, northwestern Anatolia , 1998 .

[15]  D. Mueller.  Plate Tectonics and Crustal Evolution , 1998 .

[16]  S. Kelley,et al.  Exhumation of blueschists along a Tethyan suture in northwest Turkey , 1998 .

[17]  J. Beard,et al.  Effects of P, f(O2) and Mg/Fe Ratio on Dehydration Melting of Model Metagreywackes , 1996 .

[18]  Jagtar Singh,et al.  Dehydration melting of tonalites. Part II. Composition of melts and solids , 1996 .

[19]  V. Gardien,et al.  Experimental melting of biotite + plagioclase + quartz ± muscovite assemblages and implications for crustal melting , 1995 .

[20]  J. Beard,et al.  Dehydration-melting of Biotite Gneiss and Quartz Amphibolite from 3 to 15 kbar , 1995 .

[21]  O. Tüysüz,et al.  A MAGMATIC BELT WITHIN THE NEO-TETHYAN SUTURE ZONE AND ITS ROLE IN THE TECTONIC EVOLUTION OF NORTHERN TURKEY , 1995 .

[22]  E. Middlemost.  Naming materials in the magma/igneous rock system , 1994 .

[23]  S. Kelley,et al.  Post-collision magmatism and tectonics in northwest Anatolia , 1994 .

[24]  P. Wyllie,et al.  Dehydration-melting of amphibolite at 10 kbar: the effects of temperature and time , 1994 .

[25]  J. D. Rosa,et al.  Microgranular enclaves as indicators of hybridization processes in granitoid rocks, Hercynian Belt, Spain , 1990 .

[26]  P. Sylvester.  Post-Collisional Alkaline Granites , 1989, The Journal of Geology.

[27]  P. Rickwood.  Boundary lines within petrologic diagrams which use oxides of major and minor elements , 1989 .

[28]  H. Huppert,et al.  The Generation of Granitic Magmas by Intrusion of Basalt into Continental Crust , 1988 .

[29]  T. Druitt,et al.  Compositional evolution of the zoned calcalkaline magma chamber of Mount Mazama, Crater Lake, Oregon , 1988 .

[30]  A. Tindle,et al.  Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks , 1984 .

[31]  G. C. Brown,et al.  The geochemical characteristics of granitoids in contrasting arcs and comments on magma sources , 1984, Journal of the Geological Society.

[32]  Yücel Yılmaz,et al.  Tethyan evolution of Turkey: A plate tectonic approach , 1981 .

[33]  A. Okay.  Mineralogy, petrology, and phase relations of glaucophane-lawsonite zone blueschists from the Tavşanli Region, Northwest Turkey , 1980 .

[34]  A. Miyashiro.  Nature of alkalic volcanic rock series , 1978 .

[35]  J. Balfour.  Transactions of the Royal Society of Edinburgh , 1870, Nature.

[36]  A. Okay.  Geochronology of Eocene plutonism and metamorphism in northest Turkey : evidence for a possible magmatic arc , 2006 .

[37]  A. P. Douce,et al.  What do experiments tell us about the relative contributions of crust and mantle to the origin of granitic magmas , 1999 .

[38]  A. Okay,et al.  Tethyan sutures of northern Turkey , 1999, Geological Society, London, Special Publications.

[39]  C. Friend.  When Continents Collide: Geodynamics and Geochemistry of Ultrahigh-Pressure Rocks , 1999 .

[40]  A. P. Douce,et al.  Melting of Crustal Rocks During Continental Collision and Subduction , 1998 .

[41]  A. P. Douce,et al.  Effects of pressure and H2O content on the compositions of primary crustal melts , 1996, Earth and Environmental Science Transactions of the Royal Society of Edinburgh.

[42]  A. Thompson.  Fertility of crustal rocks during anatexis , 1996, Earth and Environmental Science Transactions of the Royal Society of Edinburgh.

[43]  D. Peate,et al.  Tectonic Implications of the Composition of Volcanic Arc Magmas , 1995 .

[44]  A. Okay.  Tectonic Units and Sutures in the Pontides, Northern Turkey , 1989 .

[45]  A. Okay.  High-pressure/low-temperature metamorphic rocks of Turkey , 1986 .

[46]  C. Hawkesworth,et al.  A geochemical traverse across the North Chilean Andes: evidence for crust generation from the mantle wedge , 1985 .

[47]  W. Boynton.  Geochemistry of the rare earth elements : meteorite studies , 1984 .

[48]  W. Boynton.  Cosmochemistry of the rare earth elements: meteorite studies. , 1984 .

[49]  B. Chappell,et al.  Two contrasting granite types , 1974 .