Evolutional history of the sea shelf
system in the Southern Central Region in
relationship with sea level fluctuation during Quaternary period
Nguyễn Thế Tiệp, Ngô Quang Toàn, Đoàn Thị Mai Khanh
The Southern Central Region was extremely affected by climate change during the Pliocene - Quaternary. The periods of transgressive entering into the coastal continent, due to the glacial, created 6 sea steps of different heights: 75-80 m, 50-60 m, 35-40 m, 10-30 m, 4-6 m, and 1-3 m corresponding to following periods: Donau-Gunz (Late Pliocene), Gunz-Mindel (Late Pleistocene - Early Qi'), Mindel-Riss (Middle Pleistocene, Early Qra), Riss - Wurm 1 (late of Middle Pleistocene, Late Qi2b), Wurm 1-Wurm 2 (Late Pleistocene, Early Q]3a) and Flandrian (Middle Holocene). In the glacial period, the continental shelf in the Southern Central Region created 5 ancient shorelines in the period of the lowest sea level, including: an ancient coastal zone at a depth of 180-200 m, 40,000-50,000 years in age; an ancient coastal zone at a depth of 140-150 m, about 15,000-18,000 years in age; an ancient coastal zone at a depth of 43- 63 m, Early Holocene, early section (14C: 10,100 years); an ancient coastal zone at a depth of 25-30 m, 8,000 years in age, Early Holocene; and an ancient coastal zone at a depth of 10-15 m, about 7,000 years in age. Based on analysis and synthesis of the sea shelf system and ancient shorelines, a curve oscillation of the regional sea level was identified during Pliocene – Quaternary.
Người biên tập: TS. Nguyễn Tiến Hải