FORMATION PROCESS OF COASTAL ECOREGIONS IN RELATION TO QUATERNARY GEOLOGICAL ACTIVITIES IN BINH THUAN PROVINCE
Keywords:Coastal ecoregion, Binh Thuan province, Quaternary geological activity.
AbstractEndogenous and exogenous geological processes have divided the coastal zone of Binh Thuan province into four typical ecological zones: Late-Holocene plain ecoregion with river-marine origin which is distributed between coastal sand dunes and the foot/base of the Truong Son mountains, coastal sand dune ecoregion 0 - 150 m high, tidal ecoregion 0 - 5 m deep, bottom-sediment ecoregion 5 - 25 m deep and the ancient shoreline ecoregion 25 - 30 m deep. The plain ecoregion and the subterranean bays were formed mainly due to the subsidence motion and the sedimentation in relation to the sea level change in the Holocene. The sand dune ecoregion was the result of the evolution process of five sand formation cycles in relation to five cycles of sea level change in the Quaternary due to the effects of five glacial cycles and interglacier Gunz/GM, Mindel/MR, Riss/R-W1, Wurm/W1-W2 and Wurm2/Flandrian transgression.
Murray-Wallace, C. V., Jones, B. G., Nghi, T., Price, D. M., Van Vinh, V., Tinh, T. N., and Nanson, G. C., 2002. Thermoluminescence ages for a reworked coastal barrier, southeastern Vietnam: a preliminary report. Journal of Asian Earth Sciences, 20(5), 535-548.
Nguyen Van Thuan, Tran Van Thao, 2008. Discovery of industrial titanium-zircon placer in the red sand of the Phan Thiet Formation in the coastal zone of South Central Coast. Journal of Geology, 308, 18-24.
Tran Van Y et al., 2005. Study on developing a comprehensive solution for rational use of Central coastal sandbanks from Quang Binh to Binh Thuan. Final Report KC.08.21, Institute of Geography, VAST, Hanoi.