Low-grade metamorphic rocks from the Pulur complex, NE Turkey: Implications for the pre-Liassic evolution of the Eastern Pontides

Gültekin Topuz; Rainer Altherr; Muharrem Satir; Winfried H. Schwarz

doi:10.1007/s00531-003-0372-5

Low-grade metamorphic rocks from the Pulur complex, NE Turkey: Implications for the pre-Liassic evolution of the Eastern Pontides

Gültekin Topuz, Rainer Altherr^*, Muharrem Satir, Winfried H. Schwarz

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

99 Citations (Scopus)

Abstract

In the Pulur complex (Sakarya Zone, Eastern Pontides, Turkey) a low-grade tectonometamorphic unit (Doǧankavak) is exposed in three tectonic windows beneath a complex medium-pressure high-temperature metamorphic unit of late Carboniferous age. The thrust plane between both units is transgressively covered by Liassic conglomerates. The Doǧankavak unit comprises a sequence of metabasites with MORB-type chemical compositions and phyllites, with subordinate calcareous phyllites, marbles, quarzofeldspathic schists and metacherts. This sequence is interpreted as a former accretionary complex related to the consumption of the Palaeotethys. Mineral parageneses in the metabasites allow for the distinction of two domains with slightly different peak metamorphic conditions, i.e. 375-425 °C/0.5-0.8 GPa (greenschist facies) and 400-470 °C/0.61.1 GPa (albite-epidote amphibolite facies . The age of metamorphism is constrained at ∼ 260 Ma (early Late Permian) by two Rb-Sr mineral-whole rock ages (hornblende, phengite) and one ⁴⁰Ar/³⁹Ar single step total fusion age (phengite). In conjunction with previous data on other accretionary complexes in the Sakarya zone in Northern Turkey, the data presented in this study suggest a continuous subduction of the Palaeotethys at least from Early/Late Permian to Late Triassic and a discontinuous preservation of accretion complexes in both space and time.

Original language	English
Pages (from-to)	72-91
Number of pages	20
Journal	International Journal of Earth Sciences
Volume	93
Issue number	1
DOIs	https://doi.org/10.1007/s00531-003-0372-5
Publication status	Published - Feb 2004
Externally published	Yes

Funding

Acknowledgements This paper benefited from careful and constructive reviews by Philippe Agard and Mme Duchère as well as from discussions with Alfons Berger, Angelika Kalt, Sonja Nico-laisen and Burhan Sadıklar. Special thanks are due to Ilona Salzmann and Udo Geilenkirchen for preparing numerous thin sections, Hans-Peter Meyer and Thomas Ludwig for their patience and never-ending assistance during REM and EPMA work, Ernst Hegner for his supervision during Rb-Sr analyses, and Gisela Bartholomä for her help during mineral separation. This study is part of the Dr. rer. nat. thesis of G.T. that was financially supported by the Deutsche Forschungsgemeinschaft (Graduiertenkolleg 273 at Heidelberg).

Funders	Funder number
Deutsche Forschungsgemeinschaft

Keywords

Isotopic dating
Low-grade metamorphism
Palaeotethys
Pontides
Pulur complex
Sakarya zone

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title = "Low-grade metamorphic rocks from the Pulur complex, NE Turkey: Implications for the pre-Liassic evolution of the Eastern Pontides",

abstract = "In the Pulur complex (Sakarya Zone, Eastern Pontides, Turkey) a low-grade tectonometamorphic unit (Doǧankavak) is exposed in three tectonic windows beneath a complex medium-pressure high-temperature metamorphic unit of late Carboniferous age. The thrust plane between both units is transgressively covered by Liassic conglomerates. The Doǧankavak unit comprises a sequence of metabasites with MORB-type chemical compositions and phyllites, with subordinate calcareous phyllites, marbles, quarzofeldspathic schists and metacherts. This sequence is interpreted as a former accretionary complex related to the consumption of the Palaeotethys. Mineral parageneses in the metabasites allow for the distinction of two domains with slightly different peak metamorphic conditions, i.e. 375-425 °C/0.5-0.8 GPa (greenschist facies) and 400-470 °C/0.61.1 GPa (albite-epidote amphibolite facies . The age of metamorphism is constrained at ∼ 260 Ma (early Late Permian) by two Rb-Sr mineral-whole rock ages (hornblende, phengite) and one 40Ar/39Ar single step total fusion age (phengite). In conjunction with previous data on other accretionary complexes in the Sakarya zone in Northern Turkey, the data presented in this study suggest a continuous subduction of the Palaeotethys at least from Early/Late Permian to Late Triassic and a discontinuous preservation of accretion complexes in both space and time.",

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JF - International Journal of Earth Sciences

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ER -

Low-grade metamorphic rocks from the Pulur complex, NE Turkey: Implications for the pre-Liassic evolution of the Eastern Pontides

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