Bài viết đã thu thập 552 mẫu độ hạt và 33 mẫu định lượng khoáng vật trong trầm tích tầng mặt tại vùng biển đảo Cô Tô, Vịnh Bắc Bộ, Việt Nam để xác định đặc điểm phân bố và nguồn gốc trầm tích. | Đặc điểm trầm tích tầng mặt vùng biển đảo Cô Tô Journal of Mining and Earth Sciences Vol. 61 Issue 2 2020 33 - 40 33 The characteristics of the surface sediments in Co To island Chi Kim Thi Ngo 1 Long Van Hoang 2 Binh Van Phan 1 Tinh Nguyen Trinh 3 Trung Tu Do 3 Hiep Huu Nguyen 1 Nghiem Van Dao 1 1 Faculty of Geosciences and Geoengineering Hanoi University of Mining and Geology Vietnam 2 Vietnam Petroleum Institute Vietnam 3 Northern Center for Planing and Investigation of Marine Resources -Environment Vietnam ARTICLE INFO ABSTRACT Article history 552 grain size samples and 33 mineral quality defined samples have been Received 15th Jan. 2020 collected in the Co To island Tonkin Bay of Vietnam to study the Accepted 24th Mar. 2020 distribution and the sediment provenance. The field investigation method Available online 29th Apr. 2020 the grain analysis and the detrital composition examination method have Keywords been used to study the characteristics of the surface sediments in Co To Co To island island. The obtained results show that the surface sediments in the area consist of ten different fields namely sandy gravel gravelly sand sand Sediment gravelly muddy sand sand mixed gravel muddy sand gravelly mud mixed The surface sediments. sand silty sand muddy sandy gravel and sandy mud. The mineral component method shows that quartz is the main contain of the surface sediment 72 0 90 6 less rock detritus felspat mica and very few of the shells. It is to confirm that the continent is the primary material source of the study area. The distribution of the sediment is complicated. As the East-Southeast side of the research area the sediment distribution following gravity way coarse grain near the shore gravel sandy gravel finer grain far off the shore gravelly muddy sand silty sand choice level is very low. This is saying that the movement of sediment in the area is dominant the flow energy is governed by the topography near the island and seafloor. Meanwhile the .
