Miocene tectonics of the Maramures area (Northern Romania): implications for the Mid-Hungarian fault zone

Abstract

The interplay between the emplacement of crustal blocks (e.g. ''ALCAPA '', ''Tisza'', ''Dacia'') and subduction retreat is a key issue for understanding the Miocene tectonic history of the Carpathians. Coeval thrusting and basin formation is linked by transfer zones, such as the Mid-Hungarian fault zone, which seperates ALCAPA from Tisza-Dacia. The presented study provides new kinematic data from this transfer zone. Early Burdigalian (20.5 to~18.5 Ma) SE-directed thrusting of the easternmost tip of ALCAPA (Pienides), over Tisza-Dacia is linked to movements along the Mid-Hungarian fault zone and the Periadriatic line, accommodating the lateral extrusion of ALCAPA. Minor Late Burdigalian (~18.5 to 16 Ma) NE-SW extension is interpreted as related to back-arc extension. Post Burdigalian (post-16 Ma) NE-SW shortening and NW-SE extension correlate with ''soft collision'' of Tisza-Dacia with the European foreland coupled with southward migration of active subduction. During this stage the Bogdan-Voda and Dragos-Voda faults were kinematically linked to the Mid-Hungarian fault zone. Sinistral transpression (16 to 12 Ma) at the Bogdan-Voda fault was followed by sinistral transtension (12-10 Ma) along the coupled Bogdan-Dragos-Voda fault system. During the transtensional stage left-lateral offset was reduced eastwards by SW trending normal faults, the fault system finally terminating in an extensional horse-tail splay.

Neogene-Quaternary Volcanic forms in the Carpathian-Pannonian Region: a review

“…Their emplacement was controlled by sinistral transtensional stress regimes at 12-10 Ma along an transcurrent fault system and oblique convergence of Tisia-Dacia with the NW-SE striking European margin [339]. The spatial distribution of intrusive bodies however is not along the main trace of the transcurrent fault.…”

Strike-slip reactivation of a Paleogene to Miocene fold and thrust belt along the central part of the Mid-Hungarian Shear Zone

“…Due to the lack of exposures in the majority of the Pannonian Basin, the exact surface position and structural style of the MHL still raises questions. Only at the Poiana Botizii area, the assumed eastern termination of the MHL (Balla 1984;Csontos et al 1992;Győrfi et al 1999;Tischler et al 2007) can the contact be directly observed: here ALCAPA is thrust over Tisza-Dacia. The affiliation of the zone near its assumed western end, close to Zagreb, is also debated (Tari & Pamić 1998;Tomljenović & Csontos 2002).…”

The contact zone between the ALCAPA and Tisza-Dacia mega-tectonic units of Northern Romania in the light of new paleomagnetic data

“…Márton & Már-ton 1978, 1996Márton & Fodor 1995Panaiotu 1998, mega-tectonic units were internally deformed. This is particularly true for their contact zone, the Mid-Hungarian fault zone, which continues into Northern Romania (Csontos & Nagymarosy 1998, Fodor et al 1999, Tischler et al 2007.…”

“…Csontos & Nagymarosy 1998, Tischler et al 2007) along the Mid-Hungarian fault zone. The Mid-Hungarian fault zone shows a polyphase history, allowing for repeatedly occurring differential movements between the invading mega-tectonic units (e.g.…”

“…In this paper two independent methods and studies are combined to better understand the tectonic evolution of the region, namely outcrop-scale structural studies (Huismans et al 1997, Tischler et al 2007) and paleomagnetic investigations. The latter became possible since the recent regional tectonic study by Tischler et al (2007) provided suitable outcrops for paleomagnetic sampling, in a generally badly exposed area with friable lithologies.…”