Comment on "petrography and petrology of the calc-alkaline Sarıhan granitoid (NE Turkey): An example of magma mingling and mixing"

In a recent paper, Aslan (2005) presents so far unique petrographic and geochemical data on Sarıhan granodiorite from Eastern Pontides, NE Turkey. Several microtextural characteristics in conjunction with microgranular enclaves are accounted for mingling and mixing of distinct magmas. Tentatively a hybrid origin is suggested. As we have been working on the geodynamic evolution of the Eastern Pontides for several years, we have grown interested in his results. However, we were altogether disappointed to see (a) overall omission of some lithological units in the geological map of the area, and inconsistencies of field relations with the previously published and well-known data, (b) miscalculation of the age value of intrusion from the Rb-Sr whole-rock data and, (c) misidentification of some microtextures and failure to recognize the true nature of the Sarıhan granodiorite. Hence, we, consider it necessary to comment briefly on this paper.

PDF

___

ASLAN, Z. 1998. Saraycık-Sarıhan Granitoyidleri (Bayburt) ve Çevre Kayaçlarının Petrolojisi, Jeokimyası ve Sarıhan Granitoyidinin Jeokronolojik İncelenmesi [Petrology-Geochemistry of Saraycık- Sarıhan Granitoids and Their Country Rocks, and Geochronology of Sarıhan Granitoid]. PhD Thesis, Karadeniz Technical University, Trabzon [in Turkish with English abstract].
ASLAN, Z. 2005. Petrography and petrology of the calc-alkaline Sarıhan granodiorite (NE Turkey): An example of magma mingling and mixing. Turkish Journal of Earth Sciences 14, 185-207.
BARBARIN, B. & DIDIER, J. 1991. Conclusions: enclaves and granite petrology. In: DIDIER, J. & BARBARIN, B. (eds) Enclaves and Granite Petrology. Elsevier, 545-549.
BOYNTON, W.V. 1984. Cosmochemistry of the rare earth elements: meteorite studies. In: HENDERSON, P. (ed), Rare Earth Element Geochemistry, 63-114, Elsevier, Amsterdam.
ÇAPKINOĞLU, S. 2003. First records of conodonts from the Permo- Carboniferous of Demirözü(Bayburt), Eastern Pontides, NE Turkey. Turkish Journal of Earth Sciences 12, 199-207.
CHAPPELL, B.W. 1996. Magma mixing and the production of compositional variation within granite suites: evidence from granites of Southeastern Australia. Journal of Petrology 37, 449-470.
DONAIRE, T., PASCUAL, E. & PIN, C. 2005. Microgranular enclaves as evidence of rapid cooling in granitoid rocks: the case of the Los Pedroches granodiorite, Iberian Massif, Spain. Contribution to Mineralogy and Petrology 149, 247-265.
İLBEYLİ, N. & PEARCE J.A. 2005. Petrogenesis of igneous enclaves in plutonic rocks of the Central Anatolian Crystalline Complex, Turkey. International Geology Review 47, 1011-1034.
LUDWIG, K.R. 2003. Isoplot 3.0: A Geochronological Toolkit for Microsoft Excel. Berkeley Geochronology Center Special Publication 4.
OKAY, A.İ. 1996. Granulite facies gneisses from the Pulur region, Eastern Pontides. Turkish Journal of Earth Sciences 5, 55-61.
OKAY, A.İ. & LEVEN, E.-JA. 1996. Stratigraphy and paleontology of the upper Paleozoic sequences in the Pulur (Bayburt) region, Eastern Pontides. Turkish Journal of Earth Sciences 5, 145-155.
OKAY, A.İ. & ŞAHİNTÜRK, Ö. 1997. Geology of the eastern Pontides. In: ROBINSON, A.G. (Ed), Regional and Petroleum Geology of the Black Sea and Surrounding Region. AAPG Memoir 68, 291-311.
OKAY, A.İ., ŞAHİNTÜRK, Ö. & YAKAR, H. 1997. Stratigraphy and tectonics of the Pulur (Bayburt) region in the eastern Pontides. Bulletin of the Mineral Research and Exploration Institute (MTA) of Turkey 119, 1-22.
PIETRANIK, A., KOEPKE, J. & PUZIEWICZ, J. 2006. Crystallization and resorption in plutonic plagioclase: implications on the evolution of granodiorite magma (Gesiniec granodiorite, Strzelin crystalline massif, SW Poland). Lithos 86, 260-280.
QIAN, Q., CHUNG, S.-L, LEE, T.-Y. & WEN, D.-J. 2003. Mesozoic high- Ba-Sr granitoids from North China: geochemical characteristics and geological implications. Terra Nova 15, 272-278.
TANYOLU, E. 1988. Pulur Masifi (Bayburt) doğu kesiminin jeolojisi [Geology of eastern part of Pulur Massif (Bayburt). Bulletin of the Mineral Research and Exploration Institute (MTA) of Turkey 108, 1-18 [in Turkish with English abstract].
TARNEY, J. & JONES, C.E. 1994. Trace element geochemistry of orogenic igneous rocks and and crustal growth models. Journal of Geological Society, London 151, 855-868.
TOPUZ, G. & ALTHERR, R. 2004. Pervasive rehydration of granulites during exhumation - an example from the Pulur complex, Eastern Pontides, Turkey. Mineralogy and Petrology 81, 165-185.
TOPUZ, G., EYÜBOĞLU, Y. & DOKUZ, A. 2002. Petrology of the Saraycık granodiorite from the Pulur Massif, NE Turkey: Primary Results. 1st International Symposium of the Faculty of Mines on Earth Sciences and Engineering, İstanbul, p. 120.
TOPUZ, G., ALTHERR, R., SCHWARZ, W.H., SIEBEL, W., SATIR, M. & DOKUZ, A. 2004a. Eosen yaşlı Saraycık granodiyoritinin petrolojisi (Bayburt, doğu Pontidler): Mafik alt kıtasal kabuğun bölümsel ergiyiği mi? [Petrology of Eocene Saraycık Granodiorite (Bayburt, eastern Pontides): is it partial melting of mafic lower crust?] I. Ulusal Jeokimya Sempozyumu, Bursa, p. 33
TOPUZ, G., ALTHERR, R., SATIR, M. & SCHWARZ, W.H. 2004b. Low grade metamorphic rocks from the Pulur complex, NE Turkey: implications for pre-Liassic evolution of the Eastern Pontides. International Journal of Earth Sciences 93, 72-91.
TOPUZ, G., ALTHERR, R., KALT, A., SATIR, M., WERNER, O. & SCHWARZ, W.H. 2004c. Aluminous granulites from the Pulur complex, NE Turkey: a case of partial melting, efficient melt extraction and crystallization. Lithos 72, 183-207.
TOPUZ, G., ALTHERR, R., SCHWARZ, W.H., SIEBEL, W., SATIR, M. & DOKUZ, A. 2005. Post-collisional plutonism with adakite-like signatures: the Eocene Saraycık granodiorite (Eastern Pontides, Turkey). Contributions to Mineralogy and Petrology 150, 441-455.
WEDEPOHL, K.H. 1995. The composition of continental crust. Geochimica et Cosmochimica Acta 59, 1217-1232.
WHITE, A.J.R., CHAPPELL B.W. & WYBORN, D. 1999. Application of the restite model to the Deddick granodiorite and its enclaves - a reinterpretation of the observations and data of Maas et al. Journal of Petrology 40, 413-421.