Transverse fold evolution in the External Sierra,southern Pyrenees,Spain |
| |
| Institution: | 1. Department of Earth Sciences, University of Zaragoza, c/Pedro Cerbuna 12, 50009 Zaragoza, Spain;2. GHS, Institute of Environmental Assessment & Water Research (IDAEA), CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain;3. Instituto Geológico y Minero de España (IGME), C/Manuel Lasala no. 44, 9° B, 50006 Zaragoza, Spain;1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, China;2. School of Earth Science and Geological Engineering, Sun Yat-Sen University, Guangzhou 510275, China;3. Department of Earth and Planetary Sciences, University of California, Davis, California 95616, USA;1. Norwegian Polar Institute, Fram Centre, N-9296 Tromsø, Norway;2. Department of Geosciences, UiT The Arctic University of Norway in Tromsø, N-9037 Tromsø, Norway;3. Department of Geology and Environmental Geosciences, Northern Illinois University, DeKalb, IL 60115, USA;4. Faculty of Earth Sciences, Vrije Universiteit, De Boelelaan 1085, 1081, HV, Amsterdam, Netherlands;5. Institute of Oceanology Polish Academy of Sciences, ul. Powstańców Warszawy 55, Sopot, Poland;1. Center for Electron Nanoscopy, Technical University of Denmark, 2800 Kongens Lyngby, Denmark;2. Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, Zografou Campus, 15784 Athens, Greece;3. Department of Geology & Mineral Engineering, Norwegian University of Science & Technology, 7491 Trondheim, Norway;4. Department of Physics, University of Ioannina, 45110 Ioannina, Greece;5. ANKA Synchrotron Radiation Facility, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;6. Karlsruhe Institute of Technology, Institute for Chemical Technology and Polymer Chemistry, Kaiserstrasse 12, 76131 Karlsruhe, Germany;7. KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, 3001 Leuven, Belgium;8. Department of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece |
| |
| Abstract: | Fault-slip data are used to reconstruct varying tectonic regimes associated with transverse fold development along the eastern and southern margins of the Jaca basin, southern Pyrenees, Spain. The Spanish Pyrenean foreland consists of thrust sheets and leading-edge décollement folds which developed within piggyback basins. Guara Formation limestones on the margins of the Jaca basin were deposited synchronously with deformation and are exposed in the External Sierra. Within the transverse folds, principal shortening axes determined from P and T dihedra plots of fault-slip data show a shift from steep shortening in stratigraphically older beds to NNE–SSW horizontal shortening in younger beds. Older strata are characterized by extensional faults interpreted to result from halotectonic (salt tectonics) deformation, whereas younger strata are characterized by contraction and strike-slip faults interpreted to result from thrust sheet emplacement. The interpretation of the timing for the shortening axes in the younger strata is supported by the observation that these axes are parallel to shortening axes determined from finite strain analysis, calcite twins, and regional thrusting directions determined from fault-related folds and slickenlines. This study shows that fault population analysis in syntectonic strata provides an opportunity to constrain kinematic evolution during orogeny. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
