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Hyaloclastites, peperites and soft-sediment deformation textures of a shallow subaqueous Miocene rhyolitic dome–cryptodome complex, Pálháza, Hungary

By
Károly Németh
Károly Németh
1
Massey University, Volcanic Risk Solutions, Institute of Natural Resources
,
P.O. Box 11 222, Palmerston North
,
New Zealand
(e-mail: k.nemeth@massey.ac.nz; s.j.cronin@massey.ac.nz)
2
Geological Institute of Hungary
,
Department of Mapping, Stefánia út 14, H-1143, Budapest
,
Hungary
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Zoltán Pécskay
Zoltán Pécskay
3
Institute of Nuclear Research, Hungarian Academy of Sciences (ATOMKI)
,
Debrecen, H-4001, P.O. Box 51
,
Hungary
(e-mail: pecskay@atomki.hu)
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Ulrike Martin
Ulrike Martin
4
Institut für Geologie, Universität Würzburg
,
Pleicherwall 1, Würzburg, D-01145
,
Germany
(e-mail: umartin@uni-wuerzburg.de)
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Katalin Gméling
Katalin Gméling
5
Department of Nuclear Research
,
Institute of Isotopes, Chemical Research Centre, Hungarian Academy of Sciences
,
H-1525 Budapest, P.O. Box 77
,
Hungary
(e-mail: gmeling@alpha0.iki.kfki.hu)
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Ferenc Molnár
Ferenc Molnár
6
Department of Mineralogy
,
Eötvös University, Pázmány Péter sétány 1-3, Budapest
,
Hungary
(e-mail: molnar@abbyss.elte.hu)
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Shane J. Cronin
Shane J. Cronin
1
Massey University, Volcanic Risk Solutions, Institute of Natural Resources
,
P.O. Box 11 222, Palmerston North
,
New Zealand
(e-mail: k.nemeth@massey.ac.nz; s.j.cronin@massey.ac.nz)
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Published:
January 01, 2008

Abstract

The NE Tokaj Mountains at Pálháza in NE Hungary are made up of a complex association of Miocene rhyolitic shallow intrusions, cryptodomes and endogenous lava domes emplaced into and onto soft, wet pelitic sediment in a shallow submarine environment. The intrusive–extrusive complex shows a range of interaction textures with the host muddy sediment, ranging from blocky peperites, formed on a 0.1 m-scale, through to irregular contacts closely resembling globular mega-peperites, on a >10 m-scale. The over 200 m-thick igneous succession is interpreted to result from the pulsatory growth of shallow cryptodomes through muddy saturated host sediment. The intrusions eventually breached the sedimentary cover to build up thick in situ hyaloclastite piles in the shallow subaqueous environment. The coherent rhyolitic cryptodome facies is surrounded by intrusive hyaloclastite in the contact zone to the pelitic host sediment. In the upper level of the complex, rhyolitic dome rock is capped and surrounded by hyaloclastite formed due to quench fragmentation upon contact of the lava surface with sea water.

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Contents

Geological Society, London, Special Publications

Structure and Emplacement of High-Level Magmatic Systems

K. Thomson
K. Thomson
University of Birmingham, UK
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N. Petford
N. Petford
Bournemouth University, UK
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Geological Society of London
Volume
302
ISBN electronic:
9781862395503
Publication date:
January 01, 2008

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