Field observation and results of experimental studies show that Gongchangling rich iron deposit is characterized by multigenesis as a result of repetition of differcnt geological processes. It probably resulted from t...Field observation and results of experimental studies show that Gongchangling rich iron deposit is characterized by multigenesis as a result of repetition of differcnt geological processes. It probably resulted from the infiltration of silica under the influence of aqueous solutions derived from migmatite-granite. Because the formation of rich iron deposit was accompanied by the formation of skarn minerals and the transformation of sedimont-metamorphie poor iron deposits, characteristics of both skarn deposits and strata-bound ore deposits ean therefore be recognized. Experimental data indicate that physico-chemical parameters of formation of rich iron deposit are P =2kbar, T = 500--600℃, pH= 8--10, and fo2 = 10^-25 bar.展开更多
The types and features of fluid inclusions from various types of tungsten deposits are discussed at some length after a brief account on geological setting of the 23 tungsten mining districts in Nanling, the greatest ...The types and features of fluid inclusions from various types of tungsten deposits are discussed at some length after a brief account on geological setting of the 23 tungsten mining districts in Nanling, the greatest tungsten-producing area in China. Temperatures of formation of these inclusions, ranging from 140° to 330℃,are determined by homogenization or discrepitation runs. On the basis of this study the authors hold that in this region wolframite as well as seheelite deposits in most instances may be genetically connected with the Yenshanian granites, and that the ore-formlng fluids responsible for wolframite mineralization possess low salinity, high density, high CO2 content, and that part of them is of the nature Of pneumatolytie hydrothermal fluids. The characteristics and temperature variation of the inclusions are examined in the light of the nature of. ore-forming fissures, the elevation of veins, wall-rock alteration, stages of minieralization, mineral association, the order of crystalization and other aspects, providing some usefull information for the investigation of ore-forming process.展开更多
The physicochemical properties of fly ash from two kinds of coal-fired power plants were studied. Three aspects were examined： the micro-morphology, the mineral composition and the content of heavy metals. The result...The physicochemical properties of fly ash from two kinds of coal-fired power plants were studied. Three aspects were examined： the micro-morphology, the mineral composition and the content of heavy metals. The results show that the fly ash from plants using a circulating fluidized bed are more irregular par- ticles, while the particles from the plants using a pulverized coal-fired boiler are mainly spherical in shape. Quartz and mullite are the main crystalline phases in the ash. Clearly, both the technology and the coal used by a power plant can influence the mineral composition of the ash. The mineral composition of fly ash from a circulating fiuidized bed is more complex than that from a pulverized coal-fired boiler. The quantity of elements found in the fly ash is greater than that found in the bottom ash for the same plant. Heavy metals are likely to be enriched in the fly ash. Heavy metal leachability was studied using two leaching methods. The results indicate that most of the heavy metals that leached during either batch leaching or column leaching experiments did not exceed the related maximum concentration standards. But Ni concentrations in the leachates from both batch and column tests exceed the standard. The highest excess rates in both tests were 572~ and 497~, which levels might threaten the environment.展开更多
The unconventional oil and gas resources presented in oil shales have meant these potential sources of hydrocarbons, which has become a research focus. China contains abundant oil shale resources, ranking fourth in th...The unconventional oil and gas resources presented in oil shales have meant these potential sources of hydrocarbons, which has become a research focus. China contains abundant oil shale resources, ranking fourth in the world, with ca. 7 254.48 x 108 t within 24 provinces, including 48 basins and 81 oil shale deposits. A- bout 48% of the total oil shale resources are concentrated in the eastern resource region, with a further 22% in the central resource region. 65 % of the total quantity of oil shale resources is present at depths of 0-500 m, with 17% of the total resources being defined as high-quality oil shales yielding more than 10% oil by weight. Chinese oil shale resources are generally hosted by Mesozoic sediments that account for 78% of the total re- sources. In terms of the geographical distribution of these resources, some 45% are located in plain regions, and different oil shale basins have various characteristics. The oil shale resources in China represent a highly prospective future source of hydrocarbons. These resources having potential use not only in power generation and oil refining but also in agriculture, metal and chemical productions, and environmental protection.展开更多
The Xiajinbao gold deposit is located in Yong’an-Xiayingfang-Maojiagou polymetallic metallogenic belt,which is animportant metallogenic belt in North China block.In this paper,we present a detailed study on fluid inc...The Xiajinbao gold deposit is located in Yong’an-Xiayingfang-Maojiagou polymetallic metallogenic belt,which is animportant metallogenic belt in North China block.In this paper,we present a detailed study on fluid inclusions and stable isotopes ofthe Xiajinbao gold deposit,Hebei Province,China,aiming at discussing the ore source,evolution of ore-forming fluid andore-forming mechanism of the deposit.The macroscopic geological characteristics,S and Pb isotopic analysis results show that thesource of ore-forming materials is mainly from granitic magma,and subordinately from country rocks.H and O isotopic compositionfeatures indicate that the ore-forming fluid is mainly derived from magmatic water.Fluid inclusion characteristics show that theore-forming fluid experienced boiling during the early mineralization stage,which led to the precipitation of gold.Fluid mixingdominated the precipitation of the ore-forming materials during the middle and late stages.The gold precipitation was caused bywater/rock reaction throughout the whole ore-forming process.展开更多
文摘Field observation and results of experimental studies show that Gongchangling rich iron deposit is characterized by multigenesis as a result of repetition of differcnt geological processes. It probably resulted from the infiltration of silica under the influence of aqueous solutions derived from migmatite-granite. Because the formation of rich iron deposit was accompanied by the formation of skarn minerals and the transformation of sedimont-metamorphie poor iron deposits, characteristics of both skarn deposits and strata-bound ore deposits ean therefore be recognized. Experimental data indicate that physico-chemical parameters of formation of rich iron deposit are P =2kbar, T = 500--600℃, pH= 8--10, and fo2 = 10^-25 bar.
文摘The types and features of fluid inclusions from various types of tungsten deposits are discussed at some length after a brief account on geological setting of the 23 tungsten mining districts in Nanling, the greatest tungsten-producing area in China. Temperatures of formation of these inclusions, ranging from 140° to 330℃,are determined by homogenization or discrepitation runs. On the basis of this study the authors hold that in this region wolframite as well as seheelite deposits in most instances may be genetically connected with the Yenshanian granites, and that the ore-formlng fluids responsible for wolframite mineralization possess low salinity, high density, high CO2 content, and that part of them is of the nature Of pneumatolytie hydrothermal fluids. The characteristics and temperature variation of the inclusions are examined in the light of the nature of. ore-forming fissures, the elevation of veins, wall-rock alteration, stages of minieralization, mineral association, the order of crystalization and other aspects, providing some usefull information for the investigation of ore-forming process.
基金provided by the Europe-AsiaLink (No. CN/ASIA-LINK/010 94556)State Scholarship Fund of China Scholarship Council (No. 2010642035)
文摘The physicochemical properties of fly ash from two kinds of coal-fired power plants were studied. Three aspects were examined： the micro-morphology, the mineral composition and the content of heavy metals. The results show that the fly ash from plants using a circulating fluidized bed are more irregular par- ticles, while the particles from the plants using a pulverized coal-fired boiler are mainly spherical in shape. Quartz and mullite are the main crystalline phases in the ash. Clearly, both the technology and the coal used by a power plant can influence the mineral composition of the ash. The mineral composition of fly ash from a circulating fiuidized bed is more complex than that from a pulverized coal-fired boiler. The quantity of elements found in the fly ash is greater than that found in the bottom ash for the same plant. Heavy metals are likely to be enriched in the fly ash. Heavy metal leachability was studied using two leaching methods. The results indicate that most of the heavy metals that leached during either batch leaching or column leaching experiments did not exceed the related maximum concentration standards. But Ni concentrations in the leachates from both batch and column tests exceed the standard. The highest excess rates in both tests were 572~ and 497~, which levels might threaten the environment.
基金Supported by the Ministry of Education of China Grants(OSR-1-03)
文摘The unconventional oil and gas resources presented in oil shales have meant these potential sources of hydrocarbons, which has become a research focus. China contains abundant oil shale resources, ranking fourth in the world, with ca. 7 254.48 x 108 t within 24 provinces, including 48 basins and 81 oil shale deposits. A- bout 48% of the total oil shale resources are concentrated in the eastern resource region, with a further 22% in the central resource region. 65 % of the total quantity of oil shale resources is present at depths of 0-500 m, with 17% of the total resources being defined as high-quality oil shales yielding more than 10% oil by weight. Chinese oil shale resources are generally hosted by Mesozoic sediments that account for 78% of the total re- sources. In terms of the geographical distribution of these resources, some 45% are located in plain regions, and different oil shale basins have various characteristics. The oil shale resources in China represent a highly prospective future source of hydrocarbons. These resources having potential use not only in power generation and oil refining but also in agriculture, metal and chemical productions, and environmental protection.
基金Project(2015CX008) supported by the Innovation Driven Plan of Central South University,China
文摘The Xiajinbao gold deposit is located in Yong’an-Xiayingfang-Maojiagou polymetallic metallogenic belt,which is animportant metallogenic belt in North China block.In this paper,we present a detailed study on fluid inclusions and stable isotopes ofthe Xiajinbao gold deposit,Hebei Province,China,aiming at discussing the ore source,evolution of ore-forming fluid andore-forming mechanism of the deposit.The macroscopic geological characteristics,S and Pb isotopic analysis results show that thesource of ore-forming materials is mainly from granitic magma,and subordinately from country rocks.H and O isotopic compositionfeatures indicate that the ore-forming fluid is mainly derived from magmatic water.Fluid inclusion characteristics show that theore-forming fluid experienced boiling during the early mineralization stage,which led to the precipitation of gold.Fluid mixingdominated the precipitation of the ore-forming materials during the middle and late stages.The gold precipitation was caused bywater/rock reaction throughout the whole ore-forming process.
