NDLI: Zircon typologies and internal structures as petrogenetic indicators in contrasting granitoid types from central Anatolia, Turkey

Content Provider	Springer Nature Link
Author	Köksal, S. Cemal Göncüoglu, M. Toksoy Köksal, F. Möller, A. Kemnitz, H.
Copyright Year	2008
Abstract	The external zircon morphology of granitoid rocks is combined with internal structures studied by cathodoluminescence imaging, to test the classic ‘Pupin method’ against geological and geochemical evidence for the origin and evolution of granitic rocks.Granitoids in Central Anatolia display a wide range of petrological characteristics from S-type and I-type to A-type. We studied the morphologies and internal structures of zircons from the Terlemez, Baranadag, Çamsari and the Hisarkaya granitoids from Central Anatolia. The Terlemez and Baranadag quartz-monzonites show a hybridized I-type nature regarding the mineralogy and geochemistry, while the Çamsari quartz-syenite is a typical A-type granitoid. The Hisarkaya porphyritic granite shows fractionated I-type geochemical characteristics, but has significant crustal involvement in its source. In these granitoids, zircon is associated with biotite, quartz, orthoclase, plagioclase, and allanite. Typological investigations after Pupin (1980) along with scanning electron microscope imaging reveal that the external morphology of zircon varies consistently with the granitoid type. Zircon populations of the I-type Terlemez and Baranadag quartz-monzonites mainly comprise S-type zircon crystals, with rare J-zircon type, and their typologic evolution trends are consistent with their calc-alkaline hybrid origin. The A-type Çamsari quartz-syenite mainly has K- and V-zircon types and typological evolution trends compatible with those of alkaline granitoids.The zircons from the Hisarkaya porphyritic granite, on the other hand, show typological characteristics similar to I- to A-type granitoids. However, cathodoluminescence images of zircons from this granitoid imply that the formation of growth zones, including some impurity elements like U, Th, Y, P, and REE at particular magmatic conditions could have resulted in abrupt typological changes during the latest stages of crystallization. The Hisarkaya porphyritic granite is thus an excellent example of the final surface morphologies of zircon not representing the overall general nature of the granitoid.Cathodoluminescence imaging of internal structures of zircons from the A-type Çamsari quartz-syenite shows extensive metamictization. Moreover, in the zircons from the I-type Terlemez and Baranadag quartz-monzonites, multiple low-luminescent corrosion zones are enriched in U, Th, and Y, and interpreted to result from magma mingling/mixing processes.
Starting Page	185
Ending Page	211
Page Count	27
File Format	PDF
ISSN	09300708
Journal	Mineralogy and Petrology
Volume Number	93
Issue Number	3-4
e-ISSN	14381168
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-02-28
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mineralogy Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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