Turkish Journal of Earth Sciences
Abstract
The Demirci migmatitic quartzofeldspathic gneisses of the Sünnice Massif, exposed in the İstanbul Zone north of Bolu, have compositions that show them to be paragneisses, associated with subordinate para-amphibolites. They consist principally of metamorphosed, rather calcareous greywackes, with sediment derived from a continental arc source. They occur in the para-autochthon below a nappe pile (Çele meta-ophiolite), deformed and subjected to amphibolite facies metamorphism before the emplacement of late Neoproterozoic metavolcanic rocks later subjected to greenschist-facies metamorphism (Yellice volcanics). As they are overlain in sequence by nappes comprising sections of the Çele meta-ophiolite with ocean floor basalt and island arc tholeiite compositions respectively, the Demirci paragneisses may represent a section of the ancient continental basement on to which the meta-ophiolite was obducted during the Proterozoic.
DOI
-
Keywords
geochemistry, nappes, Proterozoic paragneiss, Sünnice Massif, Turkey
First Page
421
Last Page
431
Recommended Citation
YİĞİTBAŞ, ERDİNÇ; WINCHESTER, JOHN A.; and OTTLEY, CHRISTOPHER J. (2008) "The Geochemistry and Setting of the Demirci Paragneisses of the Sünnice Massif, NW Turkey," Turkish Journal of Earth Sciences: Vol. 17: No. 3, Article 1. Available at: https://journals.tubitak.gov.tr/earth/vol17/iss3/1
