Deep structure and margins of the Kurai Basin (Gorny Altai), from controlled-source resistivity data |
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| Institution: | 1. A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;1. Department of Sciences, University of Basilicata, viale dell''Ateneo Lucano 10, 85100 Potenza, Italy;2. National Research Council – Institute of Methodologies for Environmental Analysis, c/da S. Loja, 85050 Tito Scalo, Italy;3. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, via Ugo La Malfa 153, 90146 Palermo, Italy;1. ArqueoUIB Research Group, Department of Historical Sciences and Theory of Art, University of the Balearic Islands, Carretera de Valldemossa Km 7,5, CP07122 Palma, Mallorca, Spain;2. SERP, Seminary of Prehistoric Studies and Research Department of History and Archaeology, Section Prehistory and Archaeology, University of Barcelona, C/Montalegre 6, 08001 Barcelona, Spain;3. Archéozoologies, Archéobotanique: Sociétés, Pratiques et Environnements, UMR 7209 of the CNRS - Muséum National d''Histoire Naturelle and Sorbonne Universités, 55 Rue Buffon, 75005 Paris, France;4. School of Earth and Ocean Sciences, Cardiff University, United Kingdom;5. Department of Biology, University of the Balearic Islands, Carretera de Valldemossa Km 7,5, CP07122 Palma, Mallorca, Spain;6. Université de Limoges, Géolab, 39E rue Camille Guérin, F-87036 Limoges, France;7. CNRS, Géolab - Laboratoire de Géographie Physique et Environnementale, F-87036 Limoges, France;1. Harokopio University, Department of Geography, 70 El. Venizelou Str., Kallithea, 176 71, Athens, Greece;2. Ephorate of Paleoanthropology & Speleology, Ministry of Culture, Education and Religious Affairs, Ardittou 34B, 116 36, Athens, Greece;3. Paris Sorbonne University Abu Dhabi, P.O. 38044 Abu Dhabi, UAE;4. National Technical University of Athens, School of Mining and Metallurgical Engineering, Applied Geophysics Laboratory, 9 Iroon Polytechniou Str., Zografou, 157 80, Athens, Greece;5. National and Kapodistrian University of Athens, Faculty of Geology and Geoenvironment, Department of Dynamic, Tectonic and Applied Geology, Panepistimioupolis Zografou, 157 84, Athens, Greece;6. The University of Sydney, Asia-Pacific Natural Hazards Research Group, School of Geosciences, Sydney NSW 2050, Australia |
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| Abstract: | The deep structure of the Kurai basin and its junction with the flanking mountains has been studied by controlled-source resistivity surveys (vertical electric sounding and transient electromagnetic methods). According to the data processing results, the basin is the deepest along its northern, southern, and eastern margins. The sedimentary fill comprises two resistivity units corresponding to two sequences deposited at different stages of the basin history. The lower, less resistive unit consists of Paleogene–Neogene lacustrine clay and the higher-resistivity upper unit represents coarser Quaternary deposits. In Paleogene–Neogene time, the basin formed by the left-lateral pull-apart mechanism. The earliest Quaternary strike-slip faulting in the setting of overall compression produced the Central Kurai basin within the northern Kurai basin, while the flanking ranges and fault blocks thrust upon the basin transforming it into a ramp. Thus, piedmont steps rose along the basin margins, and the marginal grabens became ramps and half-ramps. |
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