tailieunhanh - Đặc điểm trầm tích tầng mặt vùng biển nông ven quần đảo Cát Bà, miền Bắc Việt Nam

Từ những kết quả trên có thể luận giải môi trường trầm tích tương đối yên tĩnh và nguồn trầm tích lục địa lớn hơn so với nguồn trầm tích từ biển. Nhóm trầm tích có nguồn gốc biển với kích thước hạt lớn, pH cao và giàu khoáng vật carbonat trong khi nhóm trầm tích có nguồn gốc lục địa đặc trưng bởi kích thước hạt nhỏ, giàu khoáng vật sét, thạch anh, gơtit. | VNU Journal of Science Earth and Environmental Sciences Vol. 36 No. 4 2020 67-79 Original Article Major Characteristics of Surface Sediments Within the Shallow Water of the Cat Ba Island North Vietnam Nguyen Huy Hoang1 Bui Van Vuong1 Evgenii Egidarev2 Vasiliy Zharikov2 Le Anh Xuan1 Lai Thi Bich Thuy3 Nguyen Thi Mai Luu1 Nguyen Dac Ve1 Duong Thanh Nghi1 Dang Hoai Nhon1 1 Institute of Marine Environment and Resources Vietnam Academy of Science and Technology 246 Da Nang Hai Phong Vietnam 2 Pacific Geographical Institute Russian Academy of Sciences 7 Radio Vladivostok Russia 3 Center for Geological Experiment Analysis Ministry of Natural Resources and Environment Km9 Nguyen Trai Ha Dong Ha Noi Vietnam Received 06 May 2020 Revised 18 August 2020 Accepted 24 August 2020 Abstract The Cat Ba is one of the largest Islands offshore North Vietnam which is characterized by an abundance of coral reefs in the East and Southeast of the island. The surface sediments are considered the basic elements for the coral ecosystem development. In this study the authors present some new results studying pH Eh mineral composition and grain size as the basic information for environmental assessment of this area. The results show that the pH value of the surface sediment varies from to with an average of while the Eh value of the sediment ranges from - to an average of demonstrating a reducing environment. The surface sediments have been classified into 8 size classes the coarse silt gt very coarse silt gt medium sand very fine sand gt very coarse sand fine sand gt coarse sand very fine gravel. Most of the sediments are poorly sorted - very poorly sorted only a few sedimentary samples are well sorted moderately sorted and moderately well sorted. The average mineral composition of the surface sediments consists of 25 quartz 17 illite 16 aragonite 13 kaolinite 10 calcite 5 chlorite 4 gothite 3 halite 2 feldspar and less montmorillonite and dolomite. .

• Địa Lý
• Environmental sciences
• Earth sciences
• Grain size
• Cat Ba island
• Trầm tích
• Khoáng vật
• Hệ sinh thái rạn san hô
• English majors environment
• the ecosystem
• components of the environment
• The biosphere
• Components of an ecosystem
• Vietnam journal of agricultural sciences
• An integrated wireless sensing system
• Integrated wireless sensing system for monitoring environmental parameters
• Monitoring environmental parameters in mushroom
• Collects spatial environmental data houses
• Social Sciences
• Environmental management
• Environmental management evaluation
• Environmental performance
• Local government
• Summary of Doctoral Thesis
• Education Sciences
• Preschool Education
• Education on environmental protection activities
• Learning through hands on experience
• Educating preschool children 4 5 years old
• Environmental
• Research
• VNU Journal of Science
• scientific research
• scientific reports
• environmental change
• environmental conditions
• hydrologic and climatic change
• Diatoms as indicators
• biogeochemical silica
• Laurentian Great Lakes
• Numerical methods
• the analysis of diatom
• Assessing environmental
• Journal of agriculture and environmental sciences
• Drivers of farmers perception of the environmental externalities
• Cotton production practices in benin
• Cotton production practices
• The factors influencing the level
• Randomly selected households
• Social sciences and humanities
• Anchored conceptual framework
• Managing environmental sanitation
• Environmental sanitation
• Hardware and software solutions
• Environmental sustainability
• Chiang Mai province
• Highland agricultural land use patterns
• Mae Raem watershed
• Mae Sa watershed
• Travel advisory system
• Tourism development
• A central province
• Red shanked douc
• Species distribution modeling
• The Red shanked douc
• The current distribution
• Đề thi học kỳ
• Indoor air pollution
• Complex buildings
• Shopping malls
• Phytoplankton blooms
• Gulf of Thailand
• El Nino
• Monthly phytoplankton blooms
• Natural organic matters removal
• Water purification
• DBPs control
• Optical Remote Sensing
• Landsat 8 OLI
• Automatic cloud detection
• Deep learning
• Open Data Cube
• Coal Bottom Ash
• Coal thermo electricity
• Saline intrusion
• Sea level rise
• Urban transportation infrastructure
• Urban residental land prices
• Cau Giay District
• Residential houses
• The subsidence
• Residential constructions
• Subsidence monitoring was carried out
• Coastal landscape
• Landscape differentiation
• Quang Ngai province
• Thuộc tính địa chấn
• Cacbonat Miocen giữa
• Cacbonat ám tiêu
• Bể Nam Côn Sơn
• Seismic refraction exploration
• Borehole data
• Groundwater potential
• Phonhong district
• Lưu vực sông Sê San
• Biến động đường bờ
• Dữ liệu viễn thám đa thời gian
• Tự làm sạch
• Chất ô nhiễm
• Nitơ và Phốtpho
• Hồ thủy điện
• Nồng độ chất ô nhiễm