Subduction in the Remnant Carpathian Flysch Basin
M. Nemčok, L. Pospíšil, I. Hrušecký, T. Zsíros, 2006. "Subduction in the Remnant Carpathian Flysch Basin", The Carpathians and Their Foreland: Geology and Hydrocarbon Resources, Jan Golonka, Frank J. Picha
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This chapter serves as an overview of facts on the Carpathian–Pannonian Tertiary development. It discusses about 35 geophysical-geological data layers of the database presented in the entire chapter, correlates them briefly, and notes the main results of such a multidisciplinary synthesis. This synthesis indicates that the remnant Carpathian Flysch Basin (rCFB) was affected by subduction since the early Miocene. Areas to the west and east of the rCFB were undergoing continent-continent collisions at the same time. From the late Oligocene to middle Miocene, crustal wedges moving laterally from these collisions became parts of the Carpathian–Pannonian slab overriding the rCFB. This basin underwent passive subduction characterized by passive sinking of the oceanic slab under its body forces. Subduction setting was characterized by a steep dip of the subducting slab, strong hinterland extension, extensive areal magmatism in the hinterland, and asthenospheric upwelling in the hinterland. The oceanic plate underlying the rCFB subducted southwestward and westward. The subduction rollback of the subducting slab under the advancing Carpathian orogen, the oblique closure of the rCFB, and the progressive change of subduction to collision from west to east along the Carpathian arc drove a scissorlike break-off of the subducting oceanic slab along the Carpathians. The break-off was driven by the weight of the subducting oceanic slab and the buoyancy of the attached continental slab. The break-off ran eastward along the whole Carpathian arc, from the early Miocene to its present position in the bend between the Eastern and Southern Carpathians.
Copyright ©2006. The American Association of Petroleum Geologists. DOI:10.1306/985628M843083
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This volume of 30 chapters authored by 107 geologists and geophysicists from Austria, Czech Republic, Hungary, Poland, Romania, Slovakia, Ukraine, United Kingdom, and the USA provides a comprehensive and understandable account of geology and hydrocarbon resources of the entire Carpathian system from northeastern Austria to southern Romania, including the Neogene foredeep, the foreland platform both in front and beneath the thrust belt, the Carpathian thrust belt, and the late and post orogenic intermontane basins. Principal chapters on regional geology are supplemented by thematic contributions on geodynamic reconstructions, regional geophysical investigations, hydrocarbon systems, and case studies of major oil and gas fields. To date, close to 7 billion barrels of oil and more than 53 trillion cubic feet of natural gas have been produced from the entire Carpathian system. Additional new reserves may be found, especially at deeper structural levels below the Neogene foredeep and the thin-skinned Carpathian thrust belt. Seventeen chapters of Memoir 84 have been printed in full. The remaining chapters have been printed as abstracts only, with the full paper for all 30 chapters as .pdf files on the CD-ROM in the back of this publication. The publication is intended as a source of information to schools, governmental and private institutions, oil companies, and potential investors.