TAILIEUCHUNG - Báo cáo " Quaternary sedimentary cycles in relation to sea level change in Vietnam "

Vietnam has over 3200 km shoreline which extends from north to south of the country. Sea level changes were principal factors influenced on sedimentary environment and compositions. In Quaternary, cycles of sea level change and tectonic movement were main factor that created Red River delta, Nam Bo plain and Central plain. There are 5 sedimentary cycles corresponding to 5 cycles of sea level change of the Red River delta and Nam Bo plain. Sedimentary cycles were . | VNU Journal of Science Earth Sciences 23 2007 235-243 Quaternary sedimentary cycles in relation to sea level change in Vietnam Tran Nghi Nguyen Thanh Lan Dinh Xuan Thanh Pham Nguyen Ha Vu Nguyen Hoang Son Tran Thi Thanh Nhan College of Science VNU Received 20 November 2007 received in revised form 15 December 2007 Abstract. Vietnam has over 3200 km shoreline which extends from north to south of the country. Sea level changes were principal factors influenced on sedimentary environment and compositions. In Quaternary cycles of sea level change and tectonic movement were main factor that created Red River delta Nam Bo plain and Central plain. There are 5 sedimentary cycles corresponding to 5 cycles of sea level change of the Red River delta and Nam Bo plain. Sedimentary cycles were characterized by sedimentary coefficients such as grain size clay content index of cation Fe2 Fe3 exchange pH variation from the start to the end of cycles. They are represented by fluvial terraces marine terraces marine notches and peat layers. In central littoral plain the relationship between sedimentary cycles and sea level is represented by five sandy cycles and distribution of coral terraces in shallow sea. There are 5 generations of ancient shoreline zones which correlated with glacial and interglacial periods in Vietnamese continental shelf the shoreline in 30 m water depth is correlated with Q21 2 . Up to 60 m water depth is correlated with Q13b-Q21 and 100-120 m water depth is correlated with Wurm2 glaciation Q13b . In 200-300 m water depth correlated with Wurm1 glaciation Q13a at 400-500 m water depth correlated with Riss glaciation Q12b at 600-700 m water depth correlated with Mindel glaciation Q12a and at 1000-1500 m water depth correlated with Gunz glaciation Q11 . As such Quaternary sea level changes in mainland and continental shelf interacted and quite distinctive form each other by pendulum rule. Keywords Quaternary sedimentary circles Red River Delta Cuu Long River Delta

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