Mineralogical characteristics of graphite ore from Bao Ha deposit, Lao Cai Province and proposing a wise useBao Ha graphite ore occurs in massive form. The graphite is characterized as disseminated flake graphite, which occurs as distorted clusters of flaky plates/flakes within 50÷500 m (Figures 2-5). Graphite flakes associated intimately with the impurities even at very small scale (~10 m) (Figures 9-11). Based on XRD measurement combining with B...
13 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 533 | Lượt tải: 0
U-Pb detrital zircon geochronology of sedimentary rocks in NE Vietnam: Implication for Early and Middle Devonian PalaeogeographyDetrital zircons from two Devonian siliciclastic rocks, the Van Canh and the Van Huong Formations from the Do Son Peninsular (NE Vietnam) were analyzed for U, Th, and Pb isotopes by LA-SF ICP-MS techniques. The youngest zircon of each formation exhibits maximum ages of sedimentation at 407.1±9.5 Ma (Van Canh Formation) and 406.3±4.0 Ma (Van H...
21 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 534 | Lượt tải: 0
Identification of geothermal reservoir from exploration data in the Bang hot spring area, Central VietnamAmong more than 280 exposed hot water sources discovered in Vietnam, the geothermal sources with the indication of magmatic origin reflecting from their geochemical characteristics, geologicaltectonic conditions, and geothermal regime are concentrated in the Central Region. Since the geothermal sources of this type were recognized as aspirin...
14 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 526 | Lượt tải: 0
Geochemistry of late Miocene-Pleistocene basalts in the Phu Quy island area (East Vietnam Sea): Implication for mantle source feature and melt generationThis paper was conducted under a project within the framework of prioritized scientific and technological research projects of the Vietnam Academy of Science and Technology ‘Study of geochemistry and petrology of basalts in the coastal and offshore areas in south- Central Vietnam with implications to mantle and lithospheric dynamics’ coded ...
19 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 515 | Lượt tải: 0
Remote Sensing for Monitoring Surface Water Quality in the Vietnamese Mekong Delta: The Application for Estimating Chemical Oxygen Demand in River Reaches in Binh Dai, Ben TreLandsat 8 provided the potential of optical remote sensing data source for estimating a large spatial distribution of the COD concentration, which was almost impossible via a traditional field-based approach. However, there was a limitation in monitoring the temporal distribution of the COD concentration due to local weather conditions of the ...
14 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 594 | Lượt tải: 0
The relation between fault movement potential and seismic activity of major faults in Northwestern VietnamIn Northwestern Vietnam, the movement potential of major fault zones such as Son La, Ma River, Lai Chau - Dien Bien, Da River faults is assessed to be closely related to the seismic activities. The calculated results of FMP at 60 survey points along major faults in Northwestern Vietnam show that the fault movement potential is mainly from me...
16 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 527 | Lượt tải: 0
Abnormal features of oceanographic characteristics in upwelling Vietnam waters under impact of El Niño eventsThis article is a part of research results of the institutional basic research project-2017 funded by Institute of Oceanographythe Vietnam Academy of Science and Technology (IO-VAST). Thanks to Professor Joji Ishizaka, Dr Eko Siswanto and other members of APN project with code CAF2015-RR11-NMY-Siswanto for discussions and exchanging on scient...
15 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 641 | Lượt tải: 0
Assessment of heavy metal pollution in abandoned Giap Lai pyrite mine (Phu Tho Province)Although Giap Lai pyrite mine has been closed down for many years the ARD still occurs and negatively impacts on quality of water and soil in the mining area. Surface water in the mining area usually has relatively low pH (<5.5) and does not meet the Standard for irrigation water (QCVN08-MT:2015/BTNMT). The levels of Fe and Mn in surface wa...
15 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 619 | Lượt tải: 0
Surface sediment grain-Size distribution and sediment transport in the subaqueous Mekong Delta, VietnamThe variation of sediment grain-size parameters from eight transects in the subaqueous Mekong Delta showed that a decreasing trend of sediment grain size was observed from seaward across the clinoform topset and foreset. Coarser sediments were abruptly dominant on the adjacent shelf, due to the less influence of modern sediments from the Mekon...
17 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 739 | Lượt tải: 0
Calculation of the turbidity transport in dinh an coastal zoneThe software RDPOL based on random walk method is used for calculation of turbidity transport in Dinh An-Tranh De coastal zone. Turbidity has been calculated and compared with the observati-on--data at HJ--stations. The resu-ltsindicate that: - In general, the computed results are in acceptable agreement with the ob- -., served data. - In Octo...
12 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 527 | Lượt tải: 0
