Influence of tectonics and neotectonics on the morphogenesis of the peak karst of Halong Bay,Vietnam |
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| Authors: | Pascal Fenart N N Cat Claude Drogue Doan Van Canh Sévenn Pistre |
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| Institution: | 1. équipe hydrogéologie, CC 059 UMR géofluides bassins eau, université Montpellier-II, place Eugène-Bataillon, 34095 Montpellier cedex 5, France fenart@dstu.univ-montp2.fr;2. severin@dstu.umv-montp2.fr;3. Vietnam National Centre for Science and Technology, Nghia Do, Tu Liem, Hanoi, Vietnam;4. équipe hydrogéologie, CC 059 UMR géofluides bassins eau, université Montpellier-II, place Eugène-Bataillon, 34095 Montpellier cedex 5, France drogue@dstu.univ-montp2.fr;5. Hanoi University of Mining and Geology, Dong Ngac, Tu Liem, Hanoi, Vietnam |
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| Abstract: | AbstractIn northeast Vietnam, the karst of Halong Bay is characterized by very active neotectonics. The directional distribution of fracturing of the calcareous rocks is characterized by the influence of two major fault zones: the Red River fault zone (N140) and the Tan-Lu fault zone (N050). Karst development was favoured by intense fracturing, according to these two major directions, and reactived during recent tectonics by a compressional regime with σ1 N070, followed by an extensional regimes with σ1 near to EW that led to significant vertical movement. These tectonics, coupled with intense erosion, led to genesis and evolution of the spectacular morphology of this peak karst. © Elsevier, Paris |
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| Keywords: | fracturation morphogenesis Halong peak karst microtectonics |
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