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Geology; February 1999; v. 27; no. 2; p. 151-154; DOI: 10.1130/0091-7613(1999)027<0151:BFITCO>2.3.CO;2
© 1999 Geological Society of America
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Back folds in the core of the Himalayan orogen: An alternative interpretation

Laurent Godin1, Richard L. Brown1, Simon Hanmer2 and Randall Parrish3

1 Department of Earth Sciences, Carleton University and Ottawa-Carleton Geoscience Centre, Ottawa, Ontario K1S 5B6, Canada
2 Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada and Department of Earth Sciences, Carleton University and Ottawa-Carleton Geoscience Centre, Ottawa, Ontario K1S 5B6, Canada
3 NERC Isotope Geosciences Laboratory, Keyworth, Nottingham NG125GG, UK, and Department of Geology, University of Leicester, Leicester LE1 7RH, UK

The hanging wall of the South Tibetan detachment system in the central Nepal Himalaya is characterized by regional-scale, northeast-verging folds, classically interpreted as gravity-induced structures developed during down-to-the-north extensional shearing along the detachment system. New structural observations and balanced cross sections of the Tethyan sedimentary sequence in the Kali Gandaki area and new U-Pb geochronology support an alternative interpretation. The northeast-verging folds developed before ductile extensional shearing along the detachment system, thereby recording some of the earliest contraction of this part of the orogen. We propose a new model in which the northeast-verging folds of the Kali Gandaki area represent the northern part of a late Eocene to Oligocene contractional fan structure.




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