In recent decades,colleagues working in the Discipline of Geological Resources and Geological Engineering at Central South University made significant progress in theoretic study and application of geophysics,ore depo...In recent decades,colleagues working in the Discipline of Geological Resources and Geological Engineering at Central South University made significant progress in theoretic study and application of geophysics,ore deposit and shale gas geology,3 D predictive modeling of concealed resources,and geological engineering.In geophysics,world-class progress was achieved in the development,data processing,equipment,and scientific survey of electromagnetic method in onshore and offshore environments and the tectonic evolution of the Tibetan Plateau.Especially,advanced wide-field electromagnetic exploration method and equipment as a highlight technique won the first prize of National Science and Technology Invention of China.In ore geology,progressive and complex characteristics of most nonferrous ore deposits and the geodynamic relationship between crust-mantle reaction and mineralization in south China were revealed.Progressive metallogenic models of certain typical ore deposits were established based on the study of fluid inclusion and geochemistry.According to characteristics of complex metallogenic system of polygenetic ore deposit,key ore-controlling factors were found and summarized.The investigation on unconventional resources advanced China’s shale gas resource evaluation system.In 3 D predictive modelling of metallogenic,a large-scale location prediction model was established for exploration of crisis mines and concealed ore deposits.Our developed 3 D predictive modeling techniques for concealed orebodies were widely used to explore deep mineral resources in China.In geological engineering area,the key technologies for deep drilling into complex formations were developed.Especially the drilling fluid and tools were utilized in the fieldwork.The rock and soil mechanics analysis method and anchor technologies were also established and applied to engineering practice.展开更多
The ilvaite-bearing skarn associations in the Galinge skarn deposit were studied to determine their physicochemical formation conditions.A thermodynamic model setting pressure of 50 MPa(Pf=Ps=50 MPa)was set up to trac...The ilvaite-bearing skarn associations in the Galinge skarn deposit were studied to determine their physicochemical formation conditions.A thermodynamic model setting pressure of 50 MPa(Pf=Ps=50 MPa)was set up to trace the skarn evolution.Petrographic evidence for replacement of garnet and magnetite by ilvaite in the early retrograde stage(Stage I)combined with thermodynamic modeling suggests that the alteration may have occurred at 400470°C under moderately high fO withΔlgfO(HM)ranges from 4 to 4.2.The model is based on a maximum 22 pressure of 50 MPa calculated from magmatic amphibole geobarometer.The continuous breakdown of ilvaite with quartz to form ferro-actinolite and magnetite occur in the late retrograde stage(Stage II).The reactions occurred at 400440°C under moderate fO(ΔlgfO(HM):4 to 4.4).In Stage III,the breakdown of ilvaite to form calcite,pyrite 22 and ferroactinolite depends on XCO which can be estimated to be in a range of 0.005 to 0.05,and the reaction would 2 occur at higher temperatures with increasing XCO.Under these conditions,the breakdown occurs at 270350°C and 2 low fO(ΔlgfO(HM):up to 5.2).The thermodynamic model for continuous evolution from Stage I to Stage III 22 completely records the conditions of the retrograde alteration,which is inconsistent with the thermobarometry imprints of fluid inclusions.Therefore,the petrography and phase relations of ilvaite are useful indicators of reaction conditions in various skarn deposit types.展开更多
文摘In recent decades,colleagues working in the Discipline of Geological Resources and Geological Engineering at Central South University made significant progress in theoretic study and application of geophysics,ore deposit and shale gas geology,3 D predictive modeling of concealed resources,and geological engineering.In geophysics,world-class progress was achieved in the development,data processing,equipment,and scientific survey of electromagnetic method in onshore and offshore environments and the tectonic evolution of the Tibetan Plateau.Especially,advanced wide-field electromagnetic exploration method and equipment as a highlight technique won the first prize of National Science and Technology Invention of China.In ore geology,progressive and complex characteristics of most nonferrous ore deposits and the geodynamic relationship between crust-mantle reaction and mineralization in south China were revealed.Progressive metallogenic models of certain typical ore deposits were established based on the study of fluid inclusion and geochemistry.According to characteristics of complex metallogenic system of polygenetic ore deposit,key ore-controlling factors were found and summarized.The investigation on unconventional resources advanced China’s shale gas resource evaluation system.In 3 D predictive modelling of metallogenic,a large-scale location prediction model was established for exploration of crisis mines and concealed ore deposits.Our developed 3 D predictive modeling techniques for concealed orebodies were widely used to explore deep mineral resources in China.In geological engineering area,the key technologies for deep drilling into complex formations were developed.Especially the drilling fluid and tools were utilized in the fieldwork.The rock and soil mechanics analysis method and anchor technologies were also established and applied to engineering practice.
基金Projects(41172076,41802080)supported by the National Natural Science Foundation of ChinaProject(1212011085528)supported by Geological Survey Program from the China Geological Survey+3 种基金Project(2019CX035)supported by Innovation-driven Plan of Central South University,ChinaProject(201411025)supported by the Scientific Research Fund from Ministry of Land and Re-sources,ChinaProject(201309)supported by the Program of High-level Geological Talents,ChinaProject(201112)supported by the Youth Geological Talents of the China Geological Survey
文摘The ilvaite-bearing skarn associations in the Galinge skarn deposit were studied to determine their physicochemical formation conditions.A thermodynamic model setting pressure of 50 MPa(Pf=Ps=50 MPa)was set up to trace the skarn evolution.Petrographic evidence for replacement of garnet and magnetite by ilvaite in the early retrograde stage(Stage I)combined with thermodynamic modeling suggests that the alteration may have occurred at 400470°C under moderately high fO withΔlgfO(HM)ranges from 4 to 4.2.The model is based on a maximum 22 pressure of 50 MPa calculated from magmatic amphibole geobarometer.The continuous breakdown of ilvaite with quartz to form ferro-actinolite and magnetite occur in the late retrograde stage(Stage II).The reactions occurred at 400440°C under moderate fO(ΔlgfO(HM):4 to 4.4).In Stage III,the breakdown of ilvaite to form calcite,pyrite 22 and ferroactinolite depends on XCO which can be estimated to be in a range of 0.005 to 0.05,and the reaction would 2 occur at higher temperatures with increasing XCO.Under these conditions,the breakdown occurs at 270350°C and 2 low fO(ΔlgfO(HM):up to 5.2).The thermodynamic model for continuous evolution from Stage I to Stage III 22 completely records the conditions of the retrograde alteration,which is inconsistent with the thermobarometry imprints of fluid inclusions.Therefore,the petrography and phase relations of ilvaite are useful indicators of reaction conditions in various skarn deposit types.
