Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation

Date

2005-05-01

Author

Karaoglu, O
Ozdemir, Y
Tolluoglu, AU
Karabiyikoglu, M
Kose, O
Froger, JL

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The volcanological development of the Nemrut stratovolcano, located near the southwestern tip of Lake Van in eastern Turkey, is subdivided into three stages: pre-caldera, post-caldera and late stages. Two ignimbrite flows have been recognized in the pre-caldera stage. The earlier of the two occurred after basaltic lavas formed along extensional fissures. The latter, which forms the main subject of this paper, was a major flow associated with the development of the Nemrut caldera. The pyroclastic deposits of the Nemrut volcano in the pre-caldera stage are divided into three phases on the basis of palaeosols that separate them. The first phase includes plinian pumice falls and a pyroclastic flow deposit. The major ignimbrite occurs in the second pyroclastic phase and is here subdivided into three sub-layers based on colour, internal grading, size of pumice and lithic clasts, and the degree of welding. The third and last pyroclastic phase was dominated by plinian pumice and ash-fall deposits.

Subject Keywords

Nemrut, Caldera, Ignimbrite, Pyroclastics, East Anatolia volcanism

URI

https://hdl.handle.net/11511/68360

Journal

TURKISH JOURNAL OF EARTH SCIENCES

Collections

Department of Geological Engineering, Article

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Citation Formats

O. Karaoglu, Y. Ozdemir, A. Tolluoglu, M. Karabiyikoglu, O. Kose, and J. Froger, “Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation,” TURKISH JOURNAL OF EARTH SCIENCES, pp. 123–143, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68360.