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Abstract:
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The Dien Bien basin in the Northwest of Vietnam is the largest one of the pull-apart
basins related to the Dien Bien - Lai Chau fault zone. This basin, orientated from the north to the
south, is 21km long, 6-8km wide and rhomboidal in shape. The process of forming this basin is
related closely to the activities of the Dien Bien - Lai Chau fault zone in Neotectonic time. On
analyzing information concerning the kinematics of the Dien Bien - Lai Chau fault zone, the
geological structure and the sediments of the basin, we suppose that the Dien Bien basin is a splay
pull-apart one related to the movement of the Dien Bien - Lai Chau fault zone in Pliocen-
Quaternary time. The determination of the mechanism of forming the Dien Bien basin is important
to specify Neotectonic activities of the Dien Bien - Lai Chau fault zone. |