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Revised volcanostratigraphy of the Upper Miocene to Lower Pliocene Ürgüp Formation, Central Anatolian volcanic province, Turkey

By
L. Viereck-Goette
L. Viereck-Goette
Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, D-07749 Jena, Germany
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P. Lepetit
P. Lepetit
Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, D-07749 Jena, Germany
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A. Gürel
A. Gürel
Department of Geological Engineering, Niğde Üniversitesi, TR-51100 Niğde, Turkey
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G. Ganskow
G. Ganskow
Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
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I. Çopuroğlu
I. Çopuroğlu
Department of Geological Engineering, Niğde Üniversitesi, TR-51100 Niğde, Turkey
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M. Abratis
M. Abratis
Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, D-07749 Jena, Germany
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Published:
April 01, 2010

Results are presented of fieldwork and laboratory analyses on the volcanostratigraphy of the Ürgüp Formation in the Central Anatolian volcanic province, Cappadocia, Turkey. The formation of late Miocene to early Pliocene age is exposed in areas of the Ürgüp Basin and Nevşehir Plateau. It consists of volcaniclastic and epiclastic members with intercalated local basaltic to andesitic lava flows and scoria. The volcaniclastic members are composed of widespread covers of voluminous rhyolitic, less often dacitic, low-aspect ignimbrites and unconsolidated Plinian air-fall pumice layers. Intercalated abundant terrestrial and/or lacustrine sedimentary successions occur, which are dominated by lahars in the south and carbonates or diatomites in the north, respectively.

Based on field, mineralogical, and geochemical evidence, a number of revisions are suggested by our studies, two of which are presented and discussed here: (1) the new correlation of the former “Sofular Ignimbrite” with the ignimbritic bed of the Sarimaden Tepe Member, and (2) the identification of a widespread pair of Plinian air-fall pumice lapilli beds, tentatively called Güzel Dere Member. It can be correlated with the former stratigraphic units “Tilköy Fall” and “Karain Fall.” The Tilköy Fall is recognized as a local remnant in an unconformity-bounded stratigraphic profile, and the Karain Fall unit is recognized as a set of reworked pumice-enriched layers in a lacustrine sediment pile. From complete terrestrial sediment sections, we identified the stratigraphic position of the Güzel Dere Member between the ignimbritic Cemilköy and Tahar Members. The pumice layers provide a new marker horizon for external epiclastic profiles in Central Anatolia not reached by ignimbrites.

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GSA Special Papers

Stratigraphy and Geology of Volcanic Areas

Gianluca Groppelli
Gianluca Groppelli
Consiglio Nazionale delle Ricerche, Istituto per la Dinamica dei Processi Ambientali, Sezione di Milano, Milano, Italy
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Lothar Viereck-Goette
Lothar Viereck-Goette
Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, Jena, Germany
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Geological Society of America
Volume
464
ISBN print:
9780813724645
Publication date:
April 01, 2010

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