NDLI: Pre-Early Ordovician Cadomian arc-type granitoids, the Bolu Massif, West Pontides, northern Turkey: geochemical evidence

Content Provider	Springer Nature Link
Author	Ustaömer, P. Ayda
Copyright Year	1999
Abstract	The West Pontides tectonic belt of northern Turkey comprises a Lower Ordovician–Lower Carboniferous transgressive sequence. A stratigraphic basement to this Paleozoic sequence is exposed in the Bolu area. The tectono-stratigraphy of the basement closely resemble that of the Cadomian belt of western Europe. Three rock units forming the basement imply development of an Andean-type active continental margin during the pre-Early Ordovician period. High-grade metamorphics (the Sünnice Group), granitoids (the Bolu Granitoid Complex) and evolved felsic meta-volcanic rocks (the Çaşurtepe Formation) are exposed unconformably beneath the Lower Ordovician fluvial clastics, between the Bolu-Yedigöller area, to the north of Bolu. The Bolu Granitoid Complex comprises a group of intrusive rocks of variable composition and size, generated through multiple episodes of magmatism, and is represented by two separate intrusive bodies within the study area, the Tüllükiriş Pluton in the west and the Kapıkaya Pluton in the east. Both plutons are mainly tonalite and granodiorite in composition. More felsic and mafic compositional varieties also occur. Major and trace element chemical characteristics of the granitoids, as well as biotite chemistry, indicate that these are volcanic arc-type granitoids and are products of an immature arc developed during early stages of a subduction. Furthermore, textural and chemical characteristics of the plutons show that these are subvolcanic intrusions, emplaced at shallow depths, and are calc-alkaline in composition. The granitoidic plutons intrude the Çaşurtepe Formation. The Çaşurtepe Formation is represented by arc-type volcanics and volcaniclastics. Both the Çaşurtepe Formation and the granitoids represent subduction-zone magmatism constructed on a continental crust, represented by the Sünnice Group. The history is very similar to Cadomian active margins as exposed in western Europe (i.e., the North Armorican and Bohemia massifs) and therefore the basement to the Paleozoic of the West Pontides is considered to be a preserved remnant of the Cadomian belt.
Starting Page	2
Ending Page	12
Page Count	11
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	88
Issue Number	1
e-ISSN	14373262
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-05-31
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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AN EXAMPLE FOR A PRE-EARLY ORDOVICIAN ARC MAGMATISM FROM NORTH TURKEY: GEOCHEMICAL STUDY OF THE ÇAŞURTEPE FORMATION (BOLU, W PONTIDES)

AN EXAMPLE FOR A PRE-EARLY ORDOVICIAN ARC MAGMATISM FROM NORTH TURKEY: GEOCHEMICAL STUDY OF THE ÇAŞURTEPE FORMATION (BOLU, W PONTIDES)

AN EXAMPLE FOR A PRE-EARLY ORDOVICIAN ARC MAGMATISM FROM NORTH TURKEY: GEOCHEMICAL STUDY OF THE ÇAŞURTEPE FORMATION (BOLU, W PONTIDES)

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Pre-Early Ordovician Cadomian arc-type granitoids, the Bolu Massif, West Pontides, northern Turkey: geochemical evidence

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