Shenzhou-14 Astronauts Return Safely Three Chinese astronauts on board the Shenzhou-14 manned spaceship returned to Earth safely on December 4,2022,after accomplishing many“firsts”during their six-month space statio...Shenzhou-14 Astronauts Return Safely Three Chinese astronauts on board the Shenzhou-14 manned spaceship returned to Earth safely on December 4,2022,after accomplishing many“firsts”during their six-month space station mission.展开更多
We performed a systematic trace and rare earth element analysis for the bedded Fe-Mn carbonate rocks related to the stratiform Ag-Pb-Zn mineralization in the Lengshuikeng ore district, Jiangxi Province, South China. T...We performed a systematic trace and rare earth element analysis for the bedded Fe-Mn carbonate rocks related to the stratiform Ag-Pb-Zn mineralization in the Lengshuikeng ore district, Jiangxi Province, South China. Three types of Fe-Mn carbonates are distinguished, namely, the massive, breccia, and vein types. Both carbonate and silicate fractions in the samples are analyzed for their trace and rare earth element concentrations using a step acid-leaching technique. Our results show that the carbonate fractions in the massive type samples have the lowest REE concentrations but pronounced positive Eu and Y anomalies with Eu/Eu＊ value from 1.3 to 6.2 and Y/Ho value from 40.1 to 59.5, and similar characteristics are also shown for the silicate fractions in the massive type samples（Eu/Eu＊=1.0-6.7, Y/Ho=20.7-55.1）. These REE characteristics are similar to those of Sedex type massive sulfide deposits worldwide, and we suggest that the massive type Fe-Mn carbonate rocks were likely formed from an exhalative volcanic-hydrothermal fluid feeding the depression basin of a volcanic lake. The high concentrations of redox-sensitive elements and ratios such as U/Th, V/Cr and V/（V＋Ni） indicate a dysoxic environment for the Fe-Mn carbonate deposition. In contrast, the breccia type and vein type Fe-Mn carbonate samples show different trace and rare earth element features from those of massive type samples, and they are more similar to the volcanic rocks and magmatic-hydrothermal fluids in the Lengshuikeng ore district and may reflect strong overprinting from volcanic and sub-volcanic magmatism related to the porphyry type mineralization in the district.展开更多
In this paper, a multiple intelligence man-machine system is put forward for productionmanagement through hierarchical cooperation in mining district, based on computer network. Thesystem’s architectural structure an...In this paper, a multiple intelligence man-machine system is put forward for productionmanagement through hierarchical cooperation in mining district, based on computer network. Thesystem’s architectural structure and operational principle are introduced. The system’s communicationbase, conference base, model base, decision base and intelligence subsystem are expounded. Besides,combining the system with a practical instance is presented to illustrate the application of the system.展开更多
文摘Shenzhou-14 Astronauts Return Safely Three Chinese astronauts on board the Shenzhou-14 manned spaceship returned to Earth safely on December 4,2022,after accomplishing many“firsts”during their six-month space station mission.
基金supported by the National 973 Program of China (No. 2012CB416706)
文摘We performed a systematic trace and rare earth element analysis for the bedded Fe-Mn carbonate rocks related to the stratiform Ag-Pb-Zn mineralization in the Lengshuikeng ore district, Jiangxi Province, South China. Three types of Fe-Mn carbonates are distinguished, namely, the massive, breccia, and vein types. Both carbonate and silicate fractions in the samples are analyzed for their trace and rare earth element concentrations using a step acid-leaching technique. Our results show that the carbonate fractions in the massive type samples have the lowest REE concentrations but pronounced positive Eu and Y anomalies with Eu/Eu＊ value from 1.3 to 6.2 and Y/Ho value from 40.1 to 59.5, and similar characteristics are also shown for the silicate fractions in the massive type samples（Eu/Eu＊=1.0-6.7, Y/Ho=20.7-55.1）. These REE characteristics are similar to those of Sedex type massive sulfide deposits worldwide, and we suggest that the massive type Fe-Mn carbonate rocks were likely formed from an exhalative volcanic-hydrothermal fluid feeding the depression basin of a volcanic lake. The high concentrations of redox-sensitive elements and ratios such as U/Th, V/Cr and V/（V＋Ni） indicate a dysoxic environment for the Fe-Mn carbonate deposition. In contrast, the breccia type and vein type Fe-Mn carbonate samples show different trace and rare earth element features from those of massive type samples, and they are more similar to the volcanic rocks and magmatic-hydrothermal fluids in the Lengshuikeng ore district and may reflect strong overprinting from volcanic and sub-volcanic magmatism related to the porphyry type mineralization in the district.
文摘In this paper, a multiple intelligence man-machine system is put forward for productionmanagement through hierarchical cooperation in mining district, based on computer network. Thesystem’s architectural structure and operational principle are introduced. The system’s communicationbase, conference base, model base, decision base and intelligence subsystem are expounded. Besides,combining the system with a practical instance is presented to illustrate the application of the system.
