The Geochemistry and Setting of the Demirci Paragneisses of the Sünnice Massif, NW Turkey

Erdinç YİĞİTBAŞ; John A. Winchester & Christopher J. OTTLEY

Article Details

The Geochemistry and Setting of the Demirci Paragneisses of the Sünnice Massif, NW Turkey

Authors:

Erdinç YİĞİTBAŞ | John A. Winchester & Christopher J. OTTLEY

Publisher:

TUBITAK

Journal:

Turkish Journal of Earth Sciences 2008 Vol.17 Issue 3, pp.421-431

Document Type:

Article

Publication Date:

2/2008

Document Language:

Turkish

Document ID (Org No.):

2000732430

Frequency:

Bimonthly

eISSN:

1303-619X

pISSN:

1300-0985

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.

 

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.

Article Details

The Geochemistry and Setting of the Demirci Paragneisses of the Sünnice Massif, NW Turkey

Authors: Erdinç YİĞİTBAŞ | John A. Winchester & Christopher J. OTTLEY

Publisher: TUBITAK

Journal: Turkish Journal of Earth Sciences 2008 Vol.17 Issue 3, pp.421-431

Document Type: Article

Publication Date: 2/2008

Document Language: Turkish

Document ID (Org No.): 2000732430

Frequency: Bimonthly

eISSN: 1303-619X

pISSN: 1300-0985

Issues

Authors:

Erdinç YİĞİTBAŞ | John A. Winchester & Christopher J. OTTLEY

Publisher:

TUBITAK

Journal:

Turkish Journal of Earth Sciences 2008 Vol.17 Issue 3, pp.421-431

Document Type:

Article

Publication Date:

2/2008

Document Language:

Turkish

Document ID (Org No.):

2000732430

Frequency:

Bimonthly

eISSN:

1303-619X

pISSN:

1300-0985