The Sichuan-Yunnan-Guizhou （SYG） Pb-Zn metallogenic province in the western Yangtze Block, is a key component of the low-temperature metallogenic domain in South China. In this area, more than 400 Pb-Zn deposits hav...The Sichuan-Yunnan-Guizhou （SYG） Pb-Zn metallogenic province in the western Yangtze Block, is a key component of the low-temperature metallogenic domain in South China. In this area, more than 400 Pb-Zn deposits have been discovered, and the total proven reserves are up to 260 million tons with lead and zinc grade reaching 10%, even up to 30%.展开更多
1 Introduction Dengfuxian orefield lies at the intersection of the Qin-Hang Combined Zone(QCZ)and the Nanling Metallogenic,and comprises Xiangdong W-Sn deposit(Also known as Dengfuxian W-Sn deposit),Jiguanshi
1 Introduction The large clusters of Zn-Pb deposits in northeastern Yunnan,located in the southwestern margin of the Yangtze Block,are an important part of the Sichuan-YunnanGuizhou Pb-Zn Poly-metallic Metallogenic Tr...1 Introduction The large clusters of Zn-Pb deposits in northeastern Yunnan,located in the southwestern margin of the Yangtze Block,are an important part of the Sichuan-YunnanGuizhou Pb-Zn Poly-metallic Metallogenic Triangle Area展开更多
The Robat geological study area is located 32 Km west-northwest of Khomein town. From the geo-structural point of view, it is in the median part of the Sanandaj-Sirjan zone [1], and from the mineralization aspect it i...The Robat geological study area is located 32 Km west-northwest of Khomein town. From the geo-structural point of view, it is in the median part of the Sanandaj-Sirjan zone [1], and from the mineralization aspect it is part of the Malayer-Esfahan Pb-Zn metallogenic belt [2]. The main hostrock of Pb-Zn ore-mineralization at the Robat deposit is the upper parts of the orbitolina-bearing limestone at its contact with the overlying unit of marl. Ore mineralization is characterized by vein-veinlet, fracture-filling and replacement textures, associated with silica, carbonate, argillic and hematitic alterations [3]. Geochemical trends of minor elements in ore represent positive correlation of Sb, Ag, Cu, Bi, Sn, Fe, U, Th, W, V, Zr and Y with Pb and Zn. Fluid inclusion study of samples indicates that primary fluid inclusions mainly consist of liquid, having an average temperature of homogeneity in the range of 160°C to 270°C, having the most frequency in the range of 180°C to 190°C at an average of 5 to 10 wt% NaCl equivalent for salinity. Based on the graph of pressure variations versus salinity (representing paleo-depth), it is understood that ore-mineralization at the Robat deposit is estimated to have formed at less than 50 bars pressure representing depths shallower than 200 m. Fluid inclusion study renders that the low salinity could be resulted from dilution by meteoric waters, also indicating that boiling could be the major mineral precipitation process. Therefore, it is concluded, based on these studies, besides field evidence, that the Robat Pb-Zn deposit shows strong affinity with MVT Pb-Zn mineralization type.展开更多
The Tayuan(Cu-Mo)-Pb-Zn deposit is located in the northern part of Daxinganling,NE China.Lenticular ore body occurs in the skarn zone.The skarn minerals mainly include garnet,pyroxene,epidote and wollastonite.Electron...The Tayuan(Cu-Mo)-Pb-Zn deposit is located in the northern part of Daxinganling,NE China.Lenticular ore body occurs in the skarn zone.The skarn minerals mainly include garnet,pyroxene,epidote and wollastonite.Electron microprobe analysis shows that the end member of garnet is mainly andradite(Ad_(62-97)Gr_(11-45),the pyroxene is mainly diopside,and epidote is mainly clinozoisite.These characteristics indicate that the Tayuan polymetallic skarn deposit is mainly calcareous skarn.Sometimes the content zonation can be observed in garnets.With one garnet crystal,content is shifty from the core to the rim.In general,the iron content in the core is higher than in the edge.The content in the garnet shows that the garnet in the Tayuan deposit formed from weak oxidation in alkaline environment with the oxygen fugacity increasing,suggesting that the hydrothermal fluid evolved from an acidic to a slight alkaline state.In the Tayuan polymetallic deposit,the ratio of Mn/Fe in pyroxene is about 1.3,and of Mg/Fe,it is about 2.The components of garnet in the Tayuan deposit plot in the field of the typical skarn Zn,Cu,Mo deposits in the world.展开更多
The Devonian hydrotyermal sedimentation and mineralization are widespread and typical in Maizi、Kelang and Chonghuer basins of southern Altay margin, and have their respective signs in occurrence, fabric and geochemis...The Devonian hydrotyermal sedimentation and mineralization are widespread and typical in Maizi、Kelang and Chonghuer basins of southern Altay margin, and have their respective signs in occurrence, fabric and geochemistry.Hydr)thermal sedimentary rocks mainly occur in the intermittent period between volcanic sub(?)ycles. They are thin-midium-bedded, lenticular and basically uniform to the occurrences of the overlying and underlying strata. The classification of the hydrothermal sedimentary rocks is proposed based on the mineral compositions. The detailed descriptions are given to the five types of hydrothermal sedimentary rocks: silicates, feldspar-rich rocks,展开更多
基金supported by the National 973 project(No.2014CB440905)
文摘The Sichuan-Yunnan-Guizhou （SYG） Pb-Zn metallogenic province in the western Yangtze Block, is a key component of the low-temperature metallogenic domain in South China. In this area, more than 400 Pb-Zn deposits have been discovered, and the total proven reserves are up to 260 million tons with lead and zinc grade reaching 10%, even up to 30%.
基金financially supported by grants from the ‘Project of Innovation-Driven Plan’ of the Central South University – China (#2015CX008)the Fundamental Research Funds for the Central Universities of Central South University (#2016zzts082)+2 种基金the National Natural Science Foundation project #41472302China Geological Survey Integrated Exploration project #12120114052101the Development Fund of the Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring
文摘1 Introduction Dengfuxian orefield lies at the intersection of the Qin-Hang Combined Zone(QCZ)and the Nanling Metallogenic,and comprises Xiangdong W-Sn deposit(Also known as Dengfuxian W-Sn deposit),Jiguanshi
基金supported by the Funds for the program of the National Natural Science Foundation (Noes. 41572060, U1133602)Projects of YM Lab (2011)Innovation Team of Yunnan province and KMUST (2008,2012)
文摘1 Introduction The large clusters of Zn-Pb deposits in northeastern Yunnan,located in the southwestern margin of the Yangtze Block,are an important part of the Sichuan-YunnanGuizhou Pb-Zn Poly-metallic Metallogenic Triangle Area
文摘The Robat geological study area is located 32 Km west-northwest of Khomein town. From the geo-structural point of view, it is in the median part of the Sanandaj-Sirjan zone [1], and from the mineralization aspect it is part of the Malayer-Esfahan Pb-Zn metallogenic belt [2]. The main hostrock of Pb-Zn ore-mineralization at the Robat deposit is the upper parts of the orbitolina-bearing limestone at its contact with the overlying unit of marl. Ore mineralization is characterized by vein-veinlet, fracture-filling and replacement textures, associated with silica, carbonate, argillic and hematitic alterations [3]. Geochemical trends of minor elements in ore represent positive correlation of Sb, Ag, Cu, Bi, Sn, Fe, U, Th, W, V, Zr and Y with Pb and Zn. Fluid inclusion study of samples indicates that primary fluid inclusions mainly consist of liquid, having an average temperature of homogeneity in the range of 160°C to 270°C, having the most frequency in the range of 180°C to 190°C at an average of 5 to 10 wt% NaCl equivalent for salinity. Based on the graph of pressure variations versus salinity (representing paleo-depth), it is understood that ore-mineralization at the Robat deposit is estimated to have formed at less than 50 bars pressure representing depths shallower than 200 m. Fluid inclusion study renders that the low salinity could be resulted from dilution by meteoric waters, also indicating that boiling could be the major mineral precipitation process. Therefore, it is concluded, based on these studies, besides field evidence, that the Robat Pb-Zn deposit shows strong affinity with MVT Pb-Zn mineralization type.
基金supported by the Natural Science Foundation of China(No.41203039)
文摘The Tayuan(Cu-Mo)-Pb-Zn deposit is located in the northern part of Daxinganling,NE China.Lenticular ore body occurs in the skarn zone.The skarn minerals mainly include garnet,pyroxene,epidote and wollastonite.Electron microprobe analysis shows that the end member of garnet is mainly andradite(Ad_(62-97)Gr_(11-45),the pyroxene is mainly diopside,and epidote is mainly clinozoisite.These characteristics indicate that the Tayuan polymetallic skarn deposit is mainly calcareous skarn.Sometimes the content zonation can be observed in garnets.With one garnet crystal,content is shifty from the core to the rim.In general,the iron content in the core is higher than in the edge.The content in the garnet shows that the garnet in the Tayuan deposit formed from weak oxidation in alkaline environment with the oxygen fugacity increasing,suggesting that the hydrothermal fluid evolved from an acidic to a slight alkaline state.In the Tayuan polymetallic deposit,the ratio of Mn/Fe in pyroxene is about 1.3,and of Mg/Fe,it is about 2.The components of garnet in the Tayuan deposit plot in the field of the typical skarn Zn,Cu,Mo deposits in the world.
文摘The Devonian hydrotyermal sedimentation and mineralization are widespread and typical in Maizi、Kelang and Chonghuer basins of southern Altay margin, and have their respective signs in occurrence, fabric and geochemistry.Hydr)thermal sedimentary rocks mainly occur in the intermittent period between volcanic sub(?)ycles. They are thin-midium-bedded, lenticular and basically uniform to the occurrences of the overlying and underlying strata. The classification of the hydrothermal sedimentary rocks is proposed based on the mineral compositions. The detailed descriptions are given to the five types of hydrothermal sedimentary rocks: silicates, feldspar-rich rocks,
