Variation in style of magmatism and emplacement mechanism induced by changes in basin environments and stress fields (Pannonian Basin, Central Europe)

Attila Petrik, L. Fodor, László Bereczki, Zsombor Klembala, Réka Lukács, Viktória Baranyi, Barbara Beke, S. Harangi

Research output: Contribution to journalArticle

Abstract

The development of high-resolution 3D seismic cubes has permitted recognition of variable subvolcanic features mostly located in passive continental margins. Our study area is situated in a different tectonic setting, in the extensional Pannonian Basin system (central Europe) where the lithospheric extension was associated with a wide variety of magmatic suites during the Miocene. Our primary objective is to map the buried magmatic bodies, to better understand the temporal and spatial variation in the style of magmatism and emplacement mechanism within the first order Mid-Hungarian Fault Zone (MHFZ) along which the substantial Miocene displacement took place. The combination of seismic, borehole and log data interpretation enabled us to delineate various previously unknown subvolcanic-volcanic features. In addition, a new approach of neural network analysis on log data was applied to detect and quantitatively characterise hydrothermal mounds that are hard to interpret solely from seismic data. The volcanic activity started in the Middle Miocene and induced the development of extrusive volcanic mounds south of the NE-SW trending, continuous strike-slip fault zone (Hajdú Fault Zone). In the earliest Late Miocene (11.6–9.78 Ma), the style of magmatic activity changed resulting in emplacement of intrusions and development of hydrothermal mounds. Sill emplacement occurred from south-east to north-west based on primary flow-emplacement structures. The time of sill emplacement and the development of hydrothermal mounds can be bracketed by onlapped forced folds and mounds. This time coincided with the acceleration of sedimentation producing poorly consolidated, water-saturated sediments preventing magma from flowing to the paleosurface. The change in extensional direction resulted in change in fault pattern, thus the formerly continuous basin-bounding strike-slip fault became segmented which could facilitate the magma flow toward the basin centre.

Original languageEnglish
JournalBasin Research
DOIs
Publication statusAccepted/In press - Jan 1 2018

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stress field
magmatism
emplacement
Miocene
fault zone
basin
strike-slip fault
sill
magma
volcanic feature
paleosurface
network analysis
data interpretation
tectonic setting
continental margin
seismic data
temporal variation
spatial variation
borehole
Europe

ASJC Scopus subject areas

  • Geology

Cite this

Variation in style of magmatism and emplacement mechanism induced by changes in basin environments and stress fields (Pannonian Basin, Central Europe). / Petrik, Attila; Fodor, L.; Bereczki, László; Klembala, Zsombor; Lukács, Réka; Baranyi, Viktória; Beke, Barbara; Harangi, S.

In: Basin Research, 01.01.2018.

Research output: Contribution to journalArticle

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