Morphological characteristics of the southwest deep - depression East Sea region
- Authors: Bat Van Dang 1, Chi Kim Thi Ngo 2*, Binh Van Phan 2, Hiep Huu Nguyen2, Hau Vinh Bui 2, Hien Thu Thi Bui 2
1 Vietnam Union of Geological Sciences, Hanoi, Vietnam
2 Hanoi University of Mining and Geology, Hanoi, Vietnam
- Received: 25th-Mar-2021
- Revised: 28th-June-2021
- Accepted: 28th-July-2021
- Online: 31st-Aug-2021
- Section: Geology - Mineral
Morphological characteristics of the southwestern deep-depression East Sea have been defined based on the subdivision into co-origin surfaces. The results show that, the study area has 16 morphological units, including: Horizontal surface, slightly inclined surface, continental shelf accumulation, 200÷300 m depth; The surface is slightly inclined and wavy accumulates the outer shelf, 300÷700 m deep; Horizontal surface, abrasive, 500÷700 m (Guyot); Abrasive horizontal surface (Guyot), depth 1,300÷1,600 m; Abrasive horizontal surface (Guyot), depth -2,000 m; The surface of the ancient volcanic crest is distributed at different depths; Young volcanic surface, 1,200÷3,000 m deep; Wavy, accumulative plain, continental rise, 1,100÷1,800 m deep; Plain transport - accumulation plain, depth 1,100÷2,300 m; The smooth plain transports accumulates, depth 2,300÷3,000 m; The plain is divided by underground hills and mountains in the north, 2,000÷2,600 m deep; The plain is strongly dissected of underground mountains, 1,700÷2,600 m deep; Deep depression surface splits; Tectonic slope surface, continental slope 800÷1,400 m depth; Slope surface of the Northwestern underground mountain range 1,800÷2,600 m; Slope surface of the Southeastern underground mountain range 2000÷2900 m. Based on the morphological characteristics of the study area, field investigation, and analytical results allowed us to capture the potential areas of the Fe - Mn nodule and crust, namely: morphological units such as Guyot, young volcanic surface are supposed to be the prospect of the Fe - Mn crust while the deepwater surfaces demonstrate favorable place for Fe - Mn nodule can produce accumulation.
Geraximov I. P., (1946). Kinh nghiệm lý giải địa mạo cho sơ đồ chung của cấu trúc địa chất Liên Xô. Những vấn đề của địa lý tự nhiên. Nhà xuất bản Viện Hàn lâm Liên Xô, , tập 12, Moxkva (bản Tiếng Nga).
Nguyễn Thế Tiệp, (2010). Nghiên cứu cấu trúc địa chất vùng biển nước sâu (>200 m nước) Nam Việt Nam là cơ sở khoa học để tìm kiếm Tài nguyên khoáng sản liên quan. Đề tài Khoa học Công nghệ cấp nhà nước KC09 - 18/06 - 10.