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AAPG Bulletin
Abstract
AAPG Bulletin, V.
Neogene kinematics of the Transylvanian basin (Romania)
Daniel Ciulavu,1 Corneliu Dinu,2 Alexandru Szakács,3 Dorin Dordea4
1University of Bucharest, Faculty of Geology and Geophysics,
6 Traian Vuia Street, 70139, sect. 1, Bucharest, Romania; email: [email protected]
2University of Bucharest, Faculty of Geology and Geophysics, 6 Traian Vuia
Street, 70139, sect. 1, Bucharest, Romania
3Geological Institute of Romania, 1 Caransobes Street, sect. 1, Bucharest,
Romania; email: [email protected]
4Prospectiuni S.A., 1 Caransobes Street, sect. 1, Bucharest, Romania
AUTHORS
Daniel Ciulavu received a diploma in geology and geophysics at the University of Bucharest in 1989 and his Ph.D. in geology at the Vrije Universiteit Amsterdam (Netherlands) in 1999. He worked two years for Geasol S.A. (Romania) in hydrogeology, coal, and alluvial gold exploration. Since 1991 he has been on the staff of the University of Bucharest, where he teaches the courses on structural geology in the Department of Geophysics and kinematic analysis for master's students.
Corneliu Dinu received a diploma in geology in 1966 and his Ph.D. in 1976 at the University of Bucharest (Romania). After graduation, he worked as field geologist for Prospectiuni S.A. (Romania). Since 1970 he has been on the staff of the University of Bucharest, where he is professor of structural geology and basin analysis. Since 1990 he has served as the dean of sciences at the Faculty of Geology and Geophysics, University of Bucharest.
Alexandru Szakács received a diploma in geology in 1974 and his Ph.D. in 2000 at the University of Bucharest (Romania). He is senior geologist at the Romanian Institute of Geology. He has 25 years of experience in studying the Neogene volcanism of the Carpathian-Pannonian area. He has also worked on the Neogene volcanism of the Cordillera Betica (Spain).
Dorin Dordea received a diploma in geology in 1974 at the University of Cluj (Romania). His field of activity is remote sensing. He has worked in several areas in Africa and Romania. Since 1999, he has served as the chief geologist of Prospectiuni S.A. (Bucharest, Romania). He is now working on the application of remote sensing in mining exploration.
ACKNOWLEDGMENTS
We thank M. Sandulescu, O. Dicea, M. Ducea, and V. Diaconescu for the fruitful discussions and the review of this paper in its first stage. D. C. and C. D. are grateful to A. Mellin, G. Parry, and G. de Broucker for their ongoing help and for the fruitful discussions about the Tertiary tectonics of Romania and especially about the Tertiary tectonics of the Transylvanian basin during the last three years. D. C. thanks S. Cloetingh, G. Bertotti, R. Huismans, and C. Sanders for continuous and fruitful discussions about the tectonics of the Pannonian-Carpathian system. We thank V. Radu, I. Bordecs, and M. Cucuetu for their ongoing help during the fieldwork in the southeastern part of the basin. We acknowledge the Romanian National Agency for Mineral Resources, Shell Romania Exploration BV, and Prospectiuni SA for permission to publish the seismic lines. We thank J. Pacht for his very constructive review that made possible the publication of this paper, and we also thank the two anonymous reviewers.
ABSTRACT
The Transylvanian basin is a major sedimentary basin located in the eastern part of the European Alpine orogenic system. It has a sedimentary fill more than 5 km (up to 8 km in some small areas) thick of Upper Cretaceous to upper Miocene deposits. It represents the main gas-producing province in Romania and central, eastern Europe.
In this article we analyze seismic lines and structural data from the basin as well as from its northern, eastern, and southeastern borders. These data indicate a tectonic origin for the Neogene structures from the Transylvanian basin. These structures include (1) northeast- and southwest-dipping thrust faults, and (2) east-northeast and west-northweststriking strike-slip faults having normal or reverse slip. Secondary structures such as salt diapirs and folds are related to these faults.
Structural data from the basin and its border indicate a Neogene overall compressional/transpressional regime having maximum principal stress oriented north to northeast.
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