Influence of tectonics and neotectonics on the morphogenesis of the peak karst of Halong Bay,Vietnam |
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| Affiliation: | 1. Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster LA1 4YW, UK;2. Department of Geography, University of Leicester, University Road, Leicester LE1 7RH, UK;3. Department of Geography, Kings College, London, WC2R 2LS, UK;4. Department of Geology, Faculty of Science, University of Tripoli, P.O. Box 13040 and 13258, Tripoli, Libya;5. Earth Sciences Department, University of Garyounis, P.O. Box 1308, Benghazi, Libya;6. NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK;1. Institute of Physical Chemistry Rostislaw Kaischew, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria;2. Research Group Electrochemical and Surface Engineering, Vrije Universiteit Brussel, 1050 Brussels, Belgium;3. Service 4 MAT: Materials, Engineering, Characterization, Synthesis & Recycling, Ecole Polytechnique de Bruxelles, Université Libre de Bruxelles, 1050 Brussels, Belgium |
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| Abstract: | In 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. |
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