The superlarge continental volcanic rock\|type uranium deposits, which were discovered abroad long ago, have not yet been reported up to now in China. This is an important problem that needs to be urgently solved by u...The superlarge continental volcanic rock\|type uranium deposits, which were discovered abroad long ago, have not yet been reported up to now in China. This is an important problem that needs to be urgently solved by uranium geologists at present. In this paper, on the basis of analyzing the metallogenic settings and geological conditions of the superlarge continental volcanic rock\|type uranium deposits discovered in the world along with the metallogenic characteristics of those of the same type in China, the space\|time distribution patterns of continental volcanics and the metallogenic potential of main tectono\|volcanic belts in China are discussed, and a synthetic conclusion has been drawn that there is a possibility to discover the superlarge continental volcanic rock\|type uranium deposits in China. Moreover, it is evidenced that the Ganhang, Nanling, Yanliao, Da Hinggan Ling and other tectono\|volcanic belts possess favorable geological conditions for the formation of ssuperlarge ore deposits of the continental volcanic rock type. The intersecting and overlapping locations of the aforementioned main belts with other tectono\|volcanic (\|intrusive) belts are the most potential areas where the superlarge continental volcanic rock\|type uranium deposits would be found.展开更多
Chatkal-Kurama region is characterized by igneous complexes of rocks with different composition. According to the existing data magmatism can be referred to 3 types:a) subductional（C<sub>1</sub>-C<sub&...Chatkal-Kurama region is characterized by igneous complexes of rocks with different composition. According to the existing data magmatism can be referred to 3 types:a) subductional（C<sub>1</sub>-C<sub>3</sub>）;b) orogenical（P<sub>1</sub>-T<sub>1</sub>）;and c) dyke（P<sub>2</sub>-T<sub>1</sub>-K）.Different ore deposits occurrences are connected with these rock complexes of Chatkal-Kurama region.展开更多
The Aqishan-Yamansu metallogenic belt(AYMB)in East Tianshan hosts abundant sub-marine volcanic-hosted iron deposits.Although there is agreement with the magmatic source of the ore-forming materials and the role of hyd...The Aqishan-Yamansu metallogenic belt(AYMB)in East Tianshan hosts abundant sub-marine volcanic-hosted iron deposits.Although there is agreement with the magmatic source of the ore-forming materials and the role of hydrothermal replacement in iron ore formation,the mineraliza-tion processes of these iron deposits remain uncertain.Three ore types are identified on the basis of the geological occurrences of minerals and the sequence of mineral in ores.The typeⅠores are characte-rized by magnetite,diopside,amphibole with a few pyrite,and chalcopyrite.The type II ores are mainly composed of magnetite,garnet,chlorite with a few pyrite,while the type III ores are mainly composed of magnetite,quartz,calcite with a few pyrite.In order to constrain the mineralization processes of these ore types,we performed iron isotopes and trace element compositions of magnetite from three typical iron deposits(Yamansu,Duotoushan and Luotuofeng).Trace element and Fe isotope investiga-tions of the three ore types reveal two major groups.The groupⅠconsists of analyses of the typeⅠandⅡores,with both showing a narrow range of positiveδ56Fe values(+0.08‰to+0.22‰for typeⅠores and+0.15‰ to+0.22‰ for typeⅡores)and plotting in the range of the ortho-magmatic field.In contrast,the group 2 is composed merely of the typeⅢores,showing a wider range of negativeδ56Fe values(-0.49‰ to-0.01‰),which is similar to the features of Fe-skarn magnetite.As shown in the binary dia-grams of magnetite trace elements and a fractionation of the Fe isotopes,different ore types were likely produced during gradually changing ore-forming stages from magmatic to hydrothermal.Collectively,the submarine volcanic-hosted iron deposits in the East Tianshan are likely the results of a continuous magmatic-hydrothermal mineralization process.展开更多
文摘The superlarge continental volcanic rock\|type uranium deposits, which were discovered abroad long ago, have not yet been reported up to now in China. This is an important problem that needs to be urgently solved by uranium geologists at present. In this paper, on the basis of analyzing the metallogenic settings and geological conditions of the superlarge continental volcanic rock\|type uranium deposits discovered in the world along with the metallogenic characteristics of those of the same type in China, the space\|time distribution patterns of continental volcanics and the metallogenic potential of main tectono\|volcanic belts in China are discussed, and a synthetic conclusion has been drawn that there is a possibility to discover the superlarge continental volcanic rock\|type uranium deposits in China. Moreover, it is evidenced that the Ganhang, Nanling, Yanliao, Da Hinggan Ling and other tectono\|volcanic belts possess favorable geological conditions for the formation of ssuperlarge ore deposits of the continental volcanic rock type. The intersecting and overlapping locations of the aforementioned main belts with other tectono\|volcanic (\|intrusive) belts are the most potential areas where the superlarge continental volcanic rock\|type uranium deposits would be found.
文摘Chatkal-Kurama region is characterized by igneous complexes of rocks with different composition. According to the existing data magmatism can be referred to 3 types:a) subductional（C<sub>1</sub>-C<sub>3</sub>）;b) orogenical（P<sub>1</sub>-T<sub>1</sub>）;and c) dyke（P<sub>2</sub>-T<sub>1</sub>-K）.Different ore deposits occurrences are connected with these rock complexes of Chatkal-Kurama region.
基金This study was financially supported by National Natural Science Foundation of China(No.41672078)the China Geological Survey(No.DD20190606).
文摘The Aqishan-Yamansu metallogenic belt(AYMB)in East Tianshan hosts abundant sub-marine volcanic-hosted iron deposits.Although there is agreement with the magmatic source of the ore-forming materials and the role of hydrothermal replacement in iron ore formation,the mineraliza-tion processes of these iron deposits remain uncertain.Three ore types are identified on the basis of the geological occurrences of minerals and the sequence of mineral in ores.The typeⅠores are characte-rized by magnetite,diopside,amphibole with a few pyrite,and chalcopyrite.The type II ores are mainly composed of magnetite,garnet,chlorite with a few pyrite,while the type III ores are mainly composed of magnetite,quartz,calcite with a few pyrite.In order to constrain the mineralization processes of these ore types,we performed iron isotopes and trace element compositions of magnetite from three typical iron deposits(Yamansu,Duotoushan and Luotuofeng).Trace element and Fe isotope investiga-tions of the three ore types reveal two major groups.The groupⅠconsists of analyses of the typeⅠandⅡores,with both showing a narrow range of positiveδ56Fe values(+0.08‰to+0.22‰for typeⅠores and+0.15‰ to+0.22‰ for typeⅡores)and plotting in the range of the ortho-magmatic field.In contrast,the group 2 is composed merely of the typeⅢores,showing a wider range of negativeδ56Fe values(-0.49‰ to-0.01‰),which is similar to the features of Fe-skarn magnetite.As shown in the binary dia-grams of magnetite trace elements and a fractionation of the Fe isotopes,different ore types were likely produced during gradually changing ore-forming stages from magmatic to hydrothermal.Collectively,the submarine volcanic-hosted iron deposits in the East Tianshan are likely the results of a continuous magmatic-hydrothermal mineralization process.
