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Differential neotectonic rotations in Anatolia and the Tauride Arc; palaeomagnetic investigation of the Erenlerdag volcanic complex and Isparta volcanic district, south-central Turkey

O. Tatar, H. Gursoy and J. D. A. Piper
Differential neotectonic rotations in Anatolia and the Tauride Arc; palaeomagnetic investigation of the Erenlerdag volcanic complex and Isparta volcanic district, south-central Turkey
Journal of the Geological Society of London (May 2002) 159, Part 3: 281-294

Abstract

In the Anatolian sector of the Alpine-Himalayan collisional belt a palaeotectonic phase of terrane accretion has been succeeded by a neotectonic phase of intracontinental deformation as the Afro-Arabian plate has continued to impinge differentially into the accreted collage. The resulting tectonic escape has, during the last few million years, extruded and rotated blocks in a southwesterly direction. This paper reports a palaeomagnetic investigation of the Erenlerdag Volcanic Complex and Isparta alkaline volcanic district undertaken to extend analysis of crustal rotation into the southwestern part of the Anatolian region, and investigate the interaction with the Isparta angle and the extensional province of western Turkey. The Erenlerdag volcanism comprises three phases of volcanism. The oldest Sille volcanics (11.7-11.4 Ma) yield a mean D=150 degrees I=-52 degrees rotated anticlockwise during early stages of crustal thickening and deformation before a later Miocene episode (c. 10.9-8.9 Ma, D=183 degrees , I=-47 degrees ) and a Mio-Pliocene episode (D=179 degrees , I=-51 degrees ). The latter two episodes indicate that no significant rotation has resulted during the neotectonic crustal extrusion in this southwestern sector of Anatolia. Further to the west within the Isparta Angle a 4.7-4.0 Ma alkaline episode yields a mean of D=186 degrees , I=-53 degrees rotated slightly clockwise. The pattern of palaeomagnetic declinations across Anatolia shows rotations that are strongly anticlockwise in the east near the Arabian pincer and diminish towards the west to become zero or slightly clockwise at the western extremity of the collage. The timing of rotation also appears to become younger towards the south. Crustal deformation has therefore been distributed and the net effect of terrane extrusion to the west and south has been to expand the curvature of the Tauride Arc and, by inference, the Cyprian Arc. Where good age control exists in Cappadocia and the Sivas Basin rotations are found to be concentrated within the last few million years and are up to an order higher than rates deduced from global positioning system. The palaeomagnetic data imply that the neotectonic deformation following collision initially produced crustal thickening resulting in uplift of the Anatolian Plateau and was only subsequently accommodated by major differential block rotation during tectonic escape.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 159, Part 3
Title: Differential neotectonic rotations in Anatolia and the Tauride Arc; palaeomagnetic investigation of the Erenlerdag volcanic complex and Isparta volcanic district, south-central Turkey
Affiliation: Cumhuriyet University, Department of Geology, Sivas, Turkey
Pages: 281-294
Published: 200205
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 49
Accession Number: 2002-036906
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: DOI 10.1144/0016-7649
Illustration Description: illus. incl. 4 tables, geol. sketch maps
N36°00'00" - N42°00'00", E32°00'00" - E42°00'00"
N35°00'00" - N40°00'00", E30°00'00" - E40°00'00"
Secondary Affiliation: University of Liverpool, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200213
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