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Magnetic fabric of ignimbrites: a case study from the Central Anatolian Volcanic Province

By
Alessandro Agrò
Alessandro Agrò
1
Dipartimento di Scienze della Terra, Via Valperga Caluso 35, 10125 Torino, Italy
2
ALP, Alpine Laboratory of Palaeomagnetism, Via Massa 6, 12016 Peveragno (CN), Italy
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Elena Zanella
Elena Zanella
1
Dipartimento di Scienze della Terra, Via Valperga Caluso 35, 10125 Torino, Italy
2
ALP, Alpine Laboratory of Palaeomagnetism, Via Massa 6, 12016 Peveragno (CN), Italy
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Jean-Luc Le Pennec
Jean-Luc Le Pennec
3
IRD, Laboratoire Magmas et Volcans, 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France
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Abidin Temel
Abidin Temel
4
Department of Geological Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey
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Published:
January 01, 2015

Abstract

The magnetic fabric of the Pliocene Kızılkaya ignimbrite in the Central Anatolian Volcanic Province has been investigated by anisotropy of magnetic susceptibility (AMS) and isothermal remanent magnetization (AIRM). Seven sections were sampled at various stratigraphic heights within the devitrified portion of the ignimbrite. The magnetic mineralogy is complex: titanomagnetite occurs as magmatic grains, and as inclusions in other phenocryst and glass shards; an oxidized phase and hematite occur in deposit levels affected by alteration processes. The disturbance produced by lithic and pumice clasts has been reduced by discarding the specimens that deviate more than ±1σ from the site mean value of the density. The AMS fabric varies along each individual section. Neither the AMS magnetic lineation nor the magnetic foliation plunge clearly define a common area as the vent location. The AIRM fabric of low-coercivity minerals, mainly represented by free titanomagnetite grains of magmatic origin, is consistent between sites and the inferred flow directions converge on a region near Derinkuyu, in the Nevsehir plateau, previously reported as the Kızılkaya ignimbrite source area. This study shows that systematic use of the remanent fabric improves the results given by AMS and aids the identification of the primary magnetic fabric related to the ignimbrite emplacement dynamics.

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Contents

Geological Society, London, Special Publications

The Use of Palaeomagnetism and Rock Magnetism to Understand Volcanic Processes

M. H. Ort
M. H. Ort
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M. Porreca
M. Porreca
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J. W. Geissman
J. W. Geissman
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Geological Society of London
Volume
396
ISBN electronic:
9781862396722
Publication date:
January 01, 2015

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