Pub Date : 2022-08-31DOI: 10.46326/jmes.2022.63(4).07
Ngan Minh Vu, D. Nguyen, L. Nguyen
The rapid development of economy and the booming urban population in large cities in Vietnam such as Hanoi and Hochiminh city lead to many urban problems of traffic jams and environmental pollutions such as dust and noise contaminations. These issuses effect directly on the health and the living of urban civilians in these cities. In order to solve these urgent transportation and social problems, some metroline projects recently have been carried out in Hanoi and Hochiminh city to meet the high urban transportation demands and to solve congestion problems. Since some Metro line projects in Hanoi and Hochiminh city have been carried out in soft soil conditions, ground improvement methods become a necessary requirement in these projects for ensuring the success of metroline projects and avoiding any potential damage occurred in the tunnelling process. A state - of - the - art soil improvement method with the jet - grouting technology has been applied in Hochiminh Metroline No.1 project with purposes of stabilizing the tunnelling process and protecting nearby existing buildings. This paper presents some applications of the jet - grouting technology when tunnelling by an earth pressure balance tunnel boring machine in the Hochiminh Metroline No. 1 project at the starting and arriving shaft areas for stabilizing the tunnelling process as well as at the Saigon Municipal Opera House area in Hochiminh city with a role of protecting method for the important historical building. By collecting design and site data combining with the analysis of the experimental and observed data obtained from the Hochiminh Metroline No.1 project, the stdy results show the effectiveness of the jet - grouting technology when applying in tunnelling projects with soft soil conditions in Vietnam. The results are also a designing reference for near future metroline project in Hanoi and Hochiminh city.
{"title":"Applications of jet - grouting technology in the Metroline No.1 project at Ho Chi Minh City","authors":"Ngan Minh Vu, D. Nguyen, L. Nguyen","doi":"10.46326/jmes.2022.63(4).07","DOIUrl":"https://doi.org/10.46326/jmes.2022.63(4).07","url":null,"abstract":"The rapid development of economy and the booming urban population in large cities in Vietnam such as Hanoi and Hochiminh city lead to many urban problems of traffic jams and environmental pollutions such as dust and noise contaminations. These issuses effect directly on the health and the living of urban civilians in these cities. In order to solve these urgent transportation and social problems, some metroline projects recently have been carried out in Hanoi and Hochiminh city to meet the high urban transportation demands and to solve congestion problems. Since some Metro line projects in Hanoi and Hochiminh city have been carried out in soft soil conditions, ground improvement methods become a necessary requirement in these projects for ensuring the success of metroline projects and avoiding any potential damage occurred in the tunnelling process. A state - of - the - art soil improvement method with the jet - grouting technology has been applied in Hochiminh Metroline No.1 project with purposes of stabilizing the tunnelling process and protecting nearby existing buildings. This paper presents some applications of the jet - grouting technology when tunnelling by an earth pressure balance tunnel boring machine in the Hochiminh Metroline No. 1 project at the starting and arriving shaft areas for stabilizing the tunnelling process as well as at the Saigon Municipal Opera House area in Hochiminh city with a role of protecting method for the important historical building. By collecting design and site data combining with the analysis of the experimental and observed data obtained from the Hochiminh Metroline No.1 project, the stdy results show the effectiveness of the jet - grouting technology when applying in tunnelling projects with soft soil conditions in Vietnam. The results are also a designing reference for near future metroline project in Hanoi and Hochiminh city.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128626036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-31DOI: 10.46326/jmes.2022.63(4).08
T. Nguyen, Truong Hung Trieu, H. Tran, H. H. Ngo, T. Tran
Mechanical equipments such as pumps, air compressors, etc. play an important role in the production, processing and transporting oil and gas since every single equipment, serves different functions. For oil and gas transportation system, pump is an essential mechanical device used to pump and transport the product. In order to promote technical features as well as high working efficiency, it is important to ensure that these devices always work the most efficiently in the best technical conditions. The application of modern scientific and technical advances to the maintenance and operation of mechanical equipment in general and pumps in particular will help to reduce the risks and bring economic benefits to the operators. This paper, therefore, presents results of the research on the application of artificial intelligence (AI) in diagnosing common failure of Condensate pums at Hai Thach - Moc Tinh field basing on analysis of field data which help to improve the efficiency of gas condensate transportation. The results helped to predict and warn early the possible failures to the Condensate pums at Hai Thach - Moc Tinh field. Results of the research can be applied to other equipment devices working in the same conditions during oil and gas production process in Vietnam.
{"title":"Research on the application of artificial intelligence tools to diagnose common failure of centrifugal pumps applied to gas condensate transportation system at Hai Thach - Moc Tinh field","authors":"T. Nguyen, Truong Hung Trieu, H. Tran, H. H. Ngo, T. Tran","doi":"10.46326/jmes.2022.63(4).08","DOIUrl":"https://doi.org/10.46326/jmes.2022.63(4).08","url":null,"abstract":"Mechanical equipments such as pumps, air compressors, etc. play an important role in the production, processing and transporting oil and gas since every single equipment, serves different functions. For oil and gas transportation system, pump is an essential mechanical device used to pump and transport the product. In order to promote technical features as well as high working efficiency, it is important to ensure that these devices always work the most efficiently in the best technical conditions. The application of modern scientific and technical advances to the maintenance and operation of mechanical equipment in general and pumps in particular will help to reduce the risks and bring economic benefits to the operators. This paper, therefore, presents results of the research on the application of artificial intelligence (AI) in diagnosing common failure of Condensate pums at Hai Thach - Moc Tinh field basing on analysis of field data which help to improve the efficiency of gas condensate transportation. The results helped to predict and warn early the possible failures to the Condensate pums at Hai Thach - Moc Tinh field. Results of the research can be applied to other equipment devices working in the same conditions during oil and gas production process in Vietnam.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115310367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-31DOI: 10.46326/jmes.2022.63(4).02
Cuong Xuan Cao, C. Le, D. N. Vo, H. Ta, Cuong Sy Ngo, Thuan The Dang
The surface plant infrastructure (SPI) of underground coal mines is one of important sets of underground mines as it includes essential objects, such as office buildings, structures and equipment used to load, receive, sort or process minerals; receive and discharge waste rocks; provide ventilation for tunnels and energy for mining operations. The measurement and collection of spatial data of SPI are important to ensure the safe and effective management and operation of mining activities in underground mines. A rapid development in geospatial technologies has facilitated the acquisition of geospatial data in the mining industry. Unmanned Aerial Vehicle (UAV) photogrammetry and Terrestrial Laser Scanning (TLS) are two of the typical geospatial technologies, which have made significant contributions to the field of geospatial data collection. While UAV photogrammetry allows to create dense point clouds with centimeter - level accuracy in a short time and large areas, TLS technology can produce dense point clouds with millimeter - level accuracy. However, the latter is time - consuming and expensive while performing on a large area. The integration of UAV and TLS data can be seen as a reasonable solution to gain the advantages of both and avoid the disadvantages of each technology. This paper presents the results of an integrated study of point cloud data generated by UAV and TLS for the plant infrastructure of the underground coal mine. Featuring structures in the study area include mineshaft tower, office and factory buildings. The results show that the UAV and TLS integrated point cloud data has millimeter - level accuracy for important objects such as mineshaft towers, while ancillary structures in the study area have centimeter - level accuracy.
{"title":"UAV and TLS point cloud integration for the surface plant infrastructure of underground coal mines","authors":"Cuong Xuan Cao, C. Le, D. N. Vo, H. Ta, Cuong Sy Ngo, Thuan The Dang","doi":"10.46326/jmes.2022.63(4).02","DOIUrl":"https://doi.org/10.46326/jmes.2022.63(4).02","url":null,"abstract":"The surface plant infrastructure (SPI) of underground coal mines is one of important sets of underground mines as it includes essential objects, such as office buildings, structures and equipment used to load, receive, sort or process minerals; receive and discharge waste rocks; provide ventilation for tunnels and energy for mining operations. The measurement and collection of spatial data of SPI are important to ensure the safe and effective management and operation of mining activities in underground mines. A rapid development in geospatial technologies has facilitated the acquisition of geospatial data in the mining industry. Unmanned Aerial Vehicle (UAV) photogrammetry and Terrestrial Laser Scanning (TLS) are two of the typical geospatial technologies, which have made significant contributions to the field of geospatial data collection. While UAV photogrammetry allows to create dense point clouds with centimeter - level accuracy in a short time and large areas, TLS technology can produce dense point clouds with millimeter - level accuracy. However, the latter is time - consuming and expensive while performing on a large area. The integration of UAV and TLS data can be seen as a reasonable solution to gain the advantages of both and avoid the disadvantages of each technology. This paper presents the results of an integrated study of point cloud data generated by UAV and TLS for the plant infrastructure of the underground coal mine. Featuring structures in the study area include mineshaft tower, office and factory buildings. The results show that the UAV and TLS integrated point cloud data has millimeter - level accuracy for important objects such as mineshaft towers, while ancillary structures in the study area have centimeter - level accuracy.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125970199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-31DOI: 10.46326/jmes.2022.63(4).10
H. Vuong, Minh Ngoc Pham, Tan D. Ngo
Marine industry is one of the strong sectors bringing great economic benefits in the world and especially in Vietnam. However, the control of marine aquatic environment is always a complicated problem in both solutions and implementation. Currently, monitoring systems are capable of measuring most of the indicators but still face many difficulties with special indicators such as NH3, H2S, which need to integrate many specialized equipment applications, complex measurement procedures, or waiting for results from a laboratory. Therefore, the implementation is hindered and increases the investment cost. In this article, the authors apply an indirect measurement method to determine the rate of ammonia (NH3) for an automatic monitoring system of the aquatic environment. The monitoring system will monitor the basic water indicators in the National technical regulation on aquaculture water including temperature, salinity, pH, and based on that to calculate and determine the distribution rate of NH3 – factor major cause of losses in the marine products industry. The application of this indirect measurement method aims to directly assess the fluctuation of the Ammonia NH3 index and contribute to the reduction of aquatic environmental monitoring models.
{"title":"Measurement and automatic monitoring insulation resistance of AC/DC mixed unearthed networks","authors":"H. Vuong, Minh Ngoc Pham, Tan D. Ngo","doi":"10.46326/jmes.2022.63(4).10","DOIUrl":"https://doi.org/10.46326/jmes.2022.63(4).10","url":null,"abstract":"Marine industry is one of the strong sectors bringing great economic benefits in the world and especially in Vietnam. However, the control of marine aquatic environment is always a complicated problem in both solutions and implementation. Currently, monitoring systems are capable of measuring most of the indicators but still face many difficulties with special indicators such as NH3, H2S, which need to integrate many specialized equipment applications, complex measurement procedures, or waiting for results from a laboratory. Therefore, the implementation is hindered and increases the investment cost. In this article, the authors apply an indirect measurement method to determine the rate of ammonia (NH3) for an automatic monitoring system of the aquatic environment. The monitoring system will monitor the basic water indicators in the National technical regulation on aquaculture water including temperature, salinity, pH, and based on that to calculate and determine the distribution rate of NH3 – factor major cause of losses in the marine products industry. The application of this indirect measurement method aims to directly assess the fluctuation of the Ammonia NH3 index and contribute to the reduction of aquatic environmental monitoring models.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121516895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-31DOI: 10.46326/jmes.2022.63(4).09
H. Tran, N. Nguyen, Truong Hung Trieu
Wellbores are usually located in saturated geological layers. The determination of pore water pressure field around the wellbore is necessary during the design calculation and drilling stages. This paper presents analytical approach to determine the pore water pressure field around a horizontal wellbore at deep geological layer that exhibits heterogeneous, isotropic or transversely isotropic behavior. Thus, the wellbore is considered to be in an infinite medium. The pore water pressure at the well wall, equal to the drilling mud pressure, together with the pore water pressure at infinity is assumed to be constant. The closed-form solutions are based on the theory of fluid transport in porous medium and the conformal mapping technique of the complex variable method. The closed-form solutions are established with the condition of transient fluid flow for the case of isotropic medium and with the condition of steady state fluid flow for the case of transversely isotropic medium. The accuracy of the closed-form solutions is validated by numerical solutions based on the finite element method. The obtained solutions can be used as tools to determine quickly and accurately the pore pressure field around the horizontal wellbore, which serves to evaluate the stability of the well wall in preliminary design of the wellbore, as well as the amount of water inflow into it. Furthermore, the closed-form solutions are also considered as reference solutions to evaluate the accuracy and reliability of numerical models.
{"title":"Closed-form solution for determination of pore pressure field around horizontal wellbore","authors":"H. Tran, N. Nguyen, Truong Hung Trieu","doi":"10.46326/jmes.2022.63(4).09","DOIUrl":"https://doi.org/10.46326/jmes.2022.63(4).09","url":null,"abstract":"Wellbores are usually located in saturated geological layers. The determination of pore water pressure field around the wellbore is necessary during the design calculation and drilling stages. This paper presents analytical approach to determine the pore water pressure field around a horizontal wellbore at deep geological layer that exhibits heterogeneous, isotropic or transversely isotropic behavior. Thus, the wellbore is considered to be in an infinite medium. The pore water pressure at the well wall, equal to the drilling mud pressure, together with the pore water pressure at infinity is assumed to be constant. The closed-form solutions are based on the theory of fluid transport in porous medium and the conformal mapping technique of the complex variable method. The closed-form solutions are established with the condition of transient fluid flow for the case of isotropic medium and with the condition of steady state fluid flow for the case of transversely isotropic medium. The accuracy of the closed-form solutions is validated by numerical solutions based on the finite element method. The obtained solutions can be used as tools to determine quickly and accurately the pore pressure field around the horizontal wellbore, which serves to evaluate the stability of the well wall in preliminary design of the wellbore, as well as the amount of water inflow into it. Furthermore, the closed-form solutions are also considered as reference solutions to evaluate the accuracy and reliability of numerical models.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130207046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-31DOI: 10.46326/jmes.2022.63(4).03
Ha Thi Thu Le, T. V. Nguyen, Lan Thi Pham, SongMei Tong, Long Huu Nguyen, On Dac Vo
Both Unmanned Aerial Vehicles (UAVs) and Terrestrial Laser Scanners (TLS) are important techniques for surveying and mapping. UAV equipment is commonly used to collect 2D or 3D data acquisition. Meanwhile, TLS equipment is used for obtaining only 3D data acquisition. However, if both are integrated, they were able to produce more accurate data. Multi-sensor data fusion helps overcome the limitations of a single sensor and enables a complete 3D model for the structure and better object classification. This study focuses on studying the combination of UAV and TLS technologies to collect, process data, and create the complete point cloud between two point clouds of the high building in Ha Long city, Quang Ninh province to establish a 3D model at LoD 3 detail level, with high accuracy. FARO FOCUS3D X130 and DJI Phantom 4 RTK equipments were used to acquire the data in the field. The aerial and ground data were processed using FARO SCENE 2019 and Agisoft PhotoScan software, respectively. The data integration process is done by converting both point clouds into the same coordinate system and then by aligning the same points of both points clouds in Cloud Compare. The result of this study is a 3D model at LoD 3 detail level of the high building based on the point cloud accuracy in centimeter level. The combined use of UAV and TLS technologies has proven to be possible to create a highly accurate 3D model, at the 1:500 scale of urban areas according to current standards.
{"title":"Combined use of Terrestrial Laser Scanning and UAV Photogrammetry in producing the LoD3 of 3D high building model","authors":"Ha Thi Thu Le, T. V. Nguyen, Lan Thi Pham, SongMei Tong, Long Huu Nguyen, On Dac Vo","doi":"10.46326/jmes.2022.63(4).03","DOIUrl":"https://doi.org/10.46326/jmes.2022.63(4).03","url":null,"abstract":"Both Unmanned Aerial Vehicles (UAVs) and Terrestrial Laser Scanners (TLS) are important techniques for surveying and mapping. UAV equipment is commonly used to collect 2D or 3D data acquisition. Meanwhile, TLS equipment is used for obtaining only 3D data acquisition. However, if both are integrated, they were able to produce more accurate data. Multi-sensor data fusion helps overcome the limitations of a single sensor and enables a complete 3D model for the structure and better object classification. This study focuses on studying the combination of UAV and TLS technologies to collect, process data, and create the complete point cloud between two point clouds of the high building in Ha Long city, Quang Ninh province to establish a 3D model at LoD 3 detail level, with high accuracy. FARO FOCUS3D X130 and DJI Phantom 4 RTK equipments were used to acquire the data in the field. The aerial and ground data were processed using FARO SCENE 2019 and Agisoft PhotoScan software, respectively. The data integration process is done by converting both point clouds into the same coordinate system and then by aligning the same points of both points clouds in Cloud Compare. The result of this study is a 3D model at LoD 3 detail level of the high building based on the point cloud accuracy in centimeter level. The combined use of UAV and TLS technologies has proven to be possible to create a highly accurate 3D model, at the 1:500 scale of urban areas according to current standards.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"6 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131798851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-31DOI: 10.46326/jmes.2022.63(4).01
Quan Anh Duong, Hien Dinh Le, Hiep Van Pham, Cuong Quoc Nguyen, Q. Bui
Along with the development of mapping technologies, the data acquisition system through the aerial laser scanning system has created a huge LiDAR point cloud data source. This is an essential and detailed data source that effectively serves various fields such as making maps and 3D maps, etc. The process of building 3D city models requires processing many types of data, at which point cloud data processing and classification play an essential role in creating an input data source for the model. Study on workflow for acquiring, processing, and classifying point cloud data is meaningful. It plays a vital role in the development and application of LiDAR technique in the current period, especially in building smart cities. The article introduces a method for acquiring, processing, and classifying LiDAR point cloud data to establish 3D city models. Based on the proposed approach, a pilot 3D model of the city in Thuong Ly ward, Hong Bang district, Hai Phong city was generated. The result of point cloud classification’s accuracy is very good, ranging from 92% to 99% depend on type of object. Based on the classification, the city’s 3D model is established with 2nd Level of Detail (LOD2) for Thuong Ly ward. The model is very useful in urban planning and management, and in the number of managing task such as infrastructure development, rescues and disaster prevention, military services and real estate business.
{"title":"Study on workflow of acquiring, processing, and classifying LiDAR point cloud for establishment of 3D city models","authors":"Quan Anh Duong, Hien Dinh Le, Hiep Van Pham, Cuong Quoc Nguyen, Q. Bui","doi":"10.46326/jmes.2022.63(4).01","DOIUrl":"https://doi.org/10.46326/jmes.2022.63(4).01","url":null,"abstract":"Along with the development of mapping technologies, the data acquisition system through the aerial laser scanning system has created a huge LiDAR point cloud data source. This is an essential and detailed data source that effectively serves various fields such as making maps and 3D maps, etc. The process of building 3D city models requires processing many types of data, at which point cloud data processing and classification play an essential role in creating an input data source for the model. Study on workflow for acquiring, processing, and classifying point cloud data is meaningful. It plays a vital role in the development and application of LiDAR technique in the current period, especially in building smart cities. The article introduces a method for acquiring, processing, and classifying LiDAR point cloud data to establish 3D city models. Based on the proposed approach, a pilot 3D model of the city in Thuong Ly ward, Hong Bang district, Hai Phong city was generated. The result of point cloud classification’s accuracy is very good, ranging from 92% to 99% depend on type of object. Based on the classification, the city’s 3D model is established with 2nd Level of Detail (LOD2) for Thuong Ly ward. The model is very useful in urban planning and management, and in the number of managing task such as infrastructure development, rescues and disaster prevention, military services and real estate business.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121871187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-31DOI: 10.46326/jmes.2022.63(4).06
B. Phan, Tinh Nguyen Trinh, Thang Anh Le, H. Tran, C. Ngo, H. H. Nguyen, Hien Thu Thi Bui
The marine area surrounding Ly Son island, of Quang Ngai province demonstrates steep and complex sea - floor morphology due to the presence of submarine coral reefs developed above the Ly Son paleo - volcano. The data of grain - size and mineral compositon analysis show that surface sediments of the Ly Son island are subdivided into 09 different sediment groups: muddy sandy gravel, sand, gravelly sand, gravel mixed sand and gravelly muddy sand, gravelly mud mixed sand, muddy sand, silty sand, gravelly mud, whose major composition is dominated by quartz (15.0÷71.0%), shelf fragments (27.0÷81.0%), minor lithic fragments and feldspar. This indicates that surface sediments can come from multi - origins in this studied area. The distribution of those sedimentary groups is relatively complex. The northern region mainly contains coarser grained sediments (i.e., sanddy gravel, sand, etc.), while the southern region hightly apears finer grained sediments (i.e., mud and silt). The coarser grained sediments such as muddy sandy gravel and gravelly sand, which are mainly coral fragment and often concentrated in the steep terrain around the emerged islands, while finer grained sediments more like sand, silty sand, etc. mostly deposited inside the submarine incised channels and slopes. The data from heavy mineral analysis show that the main valuable placer are ilmenite, zircon, etc. but their grades are very low and hence little economic prospect (ilmenite accounts for 23.57÷23.83 g/m3; zircon accounts for 0.33÷4.53 g/m3); Minerals used as construction materials are concentrated mainly in coarse - grained sedimentary fields (sand, gravelly sand and gravel mixed sand) with economic potential to serve construction needs on Ly Son island.
{"title":"Characteristics of the surface sediments surounding Ly Son island and related mineral potentials","authors":"B. Phan, Tinh Nguyen Trinh, Thang Anh Le, H. Tran, C. Ngo, H. H. Nguyen, Hien Thu Thi Bui","doi":"10.46326/jmes.2022.63(4).06","DOIUrl":"https://doi.org/10.46326/jmes.2022.63(4).06","url":null,"abstract":"The marine area surrounding Ly Son island, of Quang Ngai province demonstrates steep and complex sea - floor morphology due to the presence of submarine coral reefs developed above the Ly Son paleo - volcano. The data of grain - size and mineral compositon analysis show that surface sediments of the Ly Son island are subdivided into 09 different sediment groups: muddy sandy gravel, sand, gravelly sand, gravel mixed sand and gravelly muddy sand, gravelly mud mixed sand, muddy sand, silty sand, gravelly mud, whose major composition is dominated by quartz (15.0÷71.0%), shelf fragments (27.0÷81.0%), minor lithic fragments and feldspar. This indicates that surface sediments can come from multi - origins in this studied area. The distribution of those sedimentary groups is relatively complex. The northern region mainly contains coarser grained sediments (i.e., sanddy gravel, sand, etc.), while the southern region hightly apears finer grained sediments (i.e., mud and silt). The coarser grained sediments such as muddy sandy gravel and gravelly sand, which are mainly coral fragment and often concentrated in the steep terrain around the emerged islands, while finer grained sediments more like sand, silty sand, etc. mostly deposited inside the submarine incised channels and slopes. The data from heavy mineral analysis show that the main valuable placer are ilmenite, zircon, etc. but their grades are very low and hence little economic prospect (ilmenite accounts for 23.57÷23.83 g/m3; zircon accounts for 0.33÷4.53 g/m3); Minerals used as construction materials are concentrated mainly in coarse - grained sedimentary fields (sand, gravelly sand and gravel mixed sand) with economic potential to serve construction needs on Ly Son island.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127763423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-31DOI: 10.46326/jmes.2022.63(4).05
H. H. Nguyen, Sang Nhu Pham, Hung The Khuong, Din Bui Dao, Bac Hoang Bui, Huy Quoc Chu
Studying sediment provenance in the marine environment particularly plays an important role in interpretation of paleoclimate, lithology of the source regions as well as tectonism controlling weathering, erosion, transportation, and deposition processes (source-to-sink analysis). However, defining sediment sources and controlling elements require quantitative data and micro-analysis as they are influenced significantly by many factors such as lithology, tectonics, and climate condition in the source regions as well as sea-level changes, oceanic circulation, and their differential setting in the sea. A number of methods are employed to elucidate sediment provenance, but not all of them are useful in the East Sea. In this study, clay mineralogy and Sr-Nd isotope of sediment cores and surrounding river sediments in this region from previous studies are reused to evaluate their effectiveness in determining sediment provenance. In comparison between sediment cores and river sediments indicates that clay mineral assemblages and Sr-Nd isotopic composition of river sediments frequently contain feature information of the source regions that are preserved in marine sediments well, implying they contain valuable information of sediment provenance. Thus, these methods have been widely utilized to identify sediment provenance in the East Sea. This study displays that sediment provenance methods based on clay mineralogy and Sr-Nd isotope are effective tools in elucidating sediment provenance in the East Sea.
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Pub Date : 2022-08-31DOI: 10.46326/jmes.2022.63(4).04
Trong Huu Nguyen, D. T. Le, Ban Xuan To, A. Pham, T. X. Ngo, N. T. Ha, Ly Ly Thi Nguyen
The Chu Lai granitogneiss is widespread throught the Northern Kontum massif. The Chu Lai body is located in the W-SW of the Nui Thanh Townlet (Nui Thanh Dists., Quang Nam Prov.). On an areas of ~ 300 km2. The Chu Lai intrusion mainly consists two mica gneiss, it is light grey and have porphyritic textures. Its major minerals include plagioclase (25÷40%), K-feldpar (20÷40%), quartz (25÷35%), biotite (5÷13%) and mustcovite (0÷6%). Accessory minerals are apatite, zircon, orthit. Garnet and tourmaline are occiasionally found. Zircons separated from a granitogneiss sample colleted in Chu Lai body are generally euhedral to subhedral, dark gray and prissmatic in shape with 100÷300 µm, with length/witdth ratios from 1:1÷1:3. There are many Neoproterozoic - Cambrian ages among the zircon cores in the Chu Lai samples, and these are regarded as inherited zircons. The LA-ICP-MS zircon age is 431 Ma, corresponding to the Silurian. The Chu Lai granitogneiss strongly negative zircon εHf (-4.2÷-11.4) and complex inherited zircon components, characteristics of typical S-type granite. Hf model ages TDM2 1.5÷1.9 Ga, suggests that the Chu Lai granitogneiss was derived from partial melting of old crustal basement rocks, probaly Paleoproterozoic in age.
初莱花岗质广泛分布于北孔图姆地块。Chu Lai body位于Nui Thanh town (Nui Thanh Dists)的西南偏西。(广南箴言)。面积约300平方公里。初莱岩体主要由两片云母片麻岩组成，呈浅灰色，具有斑状质结构。主要矿物有斜长石(25÷40%)、钾长石(20÷40%)、石英(25÷35%)、黑云母(5÷13%)、褐云母(0÷6%)。副矿物有磷灰石、锆石、滑石。偶尔发现石榴石和电气石。初莱岩体花岗岩体锆石一般为自面状至亚面状，深灰色，棱柱状，尺寸为100÷300µm，长/宽比值为1:1÷1:3。初莱样品的锆石岩心中有许多新元古代—寒武系的锆石，这些锆石被认为是继承的。LA-ICP-MS锆石年龄为431 Ma，对应志留纪。初莱花岗岩体具有强负锆石εHf (-4.2÷-11.4)和复杂的继承锆石成分，具有典型的s型花岗岩特征。Hf模式年龄TDM2 1.5÷1.9 Ga，表明初莱花岗花岗岩来源于古地壳基底岩的部分熔融，年龄可能为古元古代。
{"title":"U-Pb zircon LA-ICP-MS and Hf composition in granitogneiss of Chu Lai body and its implication of the Kontum massif, central Vietnam","authors":"Trong Huu Nguyen, D. T. Le, Ban Xuan To, A. Pham, T. X. Ngo, N. T. Ha, Ly Ly Thi Nguyen","doi":"10.46326/jmes.2022.63(4).04","DOIUrl":"https://doi.org/10.46326/jmes.2022.63(4).04","url":null,"abstract":"The Chu Lai granitogneiss is widespread throught the Northern Kontum massif. The Chu Lai body is located in the W-SW of the Nui Thanh Townlet (Nui Thanh Dists., Quang Nam Prov.). On an areas of ~ 300 km2. The Chu Lai intrusion mainly consists two mica gneiss, it is light grey and have porphyritic textures. Its major minerals include plagioclase (25÷40%), K-feldpar (20÷40%), quartz (25÷35%), biotite (5÷13%) and mustcovite (0÷6%). Accessory minerals are apatite, zircon, orthit. Garnet and tourmaline are occiasionally found. Zircons separated from a granitogneiss sample colleted in Chu Lai body are generally euhedral to subhedral, dark gray and prissmatic in shape with 100÷300 µm, with length/witdth ratios from 1:1÷1:3. There are many Neoproterozoic - Cambrian ages among the zircon cores in the Chu Lai samples, and these are regarded as inherited zircons. The LA-ICP-MS zircon age is 431 Ma, corresponding to the Silurian. The Chu Lai granitogneiss strongly negative zircon εHf (-4.2÷-11.4) and complex inherited zircon components, characteristics of typical S-type granite. Hf model ages TDM2 1.5÷1.9 Ga, suggests that the Chu Lai granitogneiss was derived from partial melting of old crustal basement rocks, probaly Paleoproterozoic in age.","PeriodicalId":170167,"journal":{"name":"Journal of Mining and Earth Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130298986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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