For the first time, fluid-melt inclusions are found in fluorite of the Huanggangliang skarn iron-tin deposit (HSID). The fluorite was formed in the main stage of mineralization, named the hydro-skarnization stage. The...For the first time, fluid-melt inclusions are found in fluorite of the Huanggangliang skarn iron-tin deposit (HSID). The fluorite was formed in the main stage of mineralization, named the hydro-skarnization stage. The inclusions contain various components such as Fe, Mg and Cr from deep sources. The melts of primary inclusions are mainly Ca- and F-rich and those of secondary inclusions tend to become Si-rich. During this evolution process, the melts and iron daughter minerals decreased and even vanished. These facts reveal that the evolution of the primary mineralizing fluids and the differentiation of the fluids and melts are the main factors leading to the deposition of Fe, Sn and other elements. This discovery confirms the magmatic genesis of the HSID and has filled in the gaps in the research of magmatogenic skarn deposits and furnished new methods for such research. Furthermore, it has enlarged the scope of the research on fluid inclusions.展开更多
Abstract: The physico-chemical conditions under which the pegmatite dyke No. 3 was formed were discussed in the light of fluid-melt inclusion evidence. Our results lend support to the frac-tionation of hydrothermal so...Abstract: The physico-chemical conditions under which the pegmatite dyke No. 3 was formed were discussed in the light of fluid-melt inclusion evidence. Our results lend support to the frac-tionation of hydrothermal solutions from magma. For the pegmatite dike No. 3, the magma-derived hydrothermal solutions are dominated by NaCl + CO2 + H2O.展开更多
Many light rare earth deposits,such as Maoniuping,Dalucao,Panzhihua deposits,are collectively distributed in Panxi rift of Sichuan Province,China,and closely associated with the aegirine quartz syenite-carbonatite com...Many light rare earth deposits,such as Maoniuping,Dalucao,Panzhihua deposits,are collectively distributed in Panxi rift of Sichuan Province,China,and closely associated with the aegirine quartz syenite-carbonatite complex.Carbon and oxygen isotope studies demonstrate that the carbonatites in the complex are of typical igneous origin related to mantle processes.Electronic microprobe studies show that the fluid-melt inclusions found in the comples are enriched in light rare earth elements(LREE),which suggest that the magma was rich in LREE and could serve as the ore source for the regional LREE mineralization. Both the aegirine quartz syenite-carbonatite complex and the LREE mineralization found therein were derived from the mantle. The rare gas isotope analyses also support that there is a genetic association between the LREE mineralization and mantle processes.展开更多
The Hetai ductile shear zone-hosted gold deposit occurs in the deep-seated fault mylonite zone of the Sinian-Silurian metamorphic rock series. In this study there have been discovered melt inclusions, fluid-melt inclu...The Hetai ductile shear zone-hosted gold deposit occurs in the deep-seated fault mylonite zone of the Sinian-Silurian metamorphic rock series. In this study there have been discovered melt inclusions, fluid-melt inclusions and organic inclusions in ore-bearing quartz veins of the ore deposit and mylonite for the first time. The homogenization temperatures of the various types of inclusions are 160℃, 180-350℃, 530℃ and 870℃ for organic inclusions, liquid inclusions, two-phase immiscible liquid inclusions and melt inclusions, respectively. Ore fluid is categorized as the neutral to basic K\++-Ca\+\{2+\}-Mg\+\{2+\}-Na\++-SO\+\{2-\}\-4-HCO\+-\-3-Cl\+- system. The contents of trace gases follow a descending order of H\-2O>CO\-2>CH\-4> (or <) H\-2>CO>C\-2H\-2>C\-2H\-6>O\-2>N\-2. The concentrations of K\++, Ca\+\{2+\}, SO\+\{2-\}\-4, HCO\+-\-3, Cl\+-, H\-2O and C\-2H\-2 in fluid inclusions are related to the contents of gold and the Au/Ag ratios in ores from different levels of the gold deposit.This is significant for deep ore prospecting in the region. Daughter minerals in melt inclusions were analyzed using SEM. Quartz, orthoclase, wollastonite and other silicate minerals were identified. They were formed in different mineral assemblages. This analysis further proves the existence of melt inclusions in ore veins. Sedimentary metamorphic rocks could form silicate melts during metamorphic anatexis and dynamic metamorphism, which possess melt-solution characteristics. Ore formation is related to the multi-stage forming process of silicate melt and fluid.展开更多
Abundant fluid-melt inc1usions are found in the aegirine-augite-barite pegmatite andcarbonatite veins in the Mianning REE deposit, Sichuan. They were trapped in early stage flu-orite and quartz from a salt-melt system...Abundant fluid-melt inc1usions are found in the aegirine-augite-barite pegmatite andcarbonatite veins in the Mianning REE deposit, Sichuan. They were trapped in early stage flu-orite and quartz from a salt-melt system at temperatures higher than 500℃. Meanwhile, fluidinclusions are also present in large amounts in bastnaesite. Homogenized between 150 and270℃, these inclusions are thought to be representative of the physiccrchemical conditions ofREE minera1ization. These results show that the Mianning REE deposit is of tyPical hy-drothermal origin developed from a salt-melt system.展开更多
文摘For the first time, fluid-melt inclusions are found in fluorite of the Huanggangliang skarn iron-tin deposit (HSID). The fluorite was formed in the main stage of mineralization, named the hydro-skarnization stage. The inclusions contain various components such as Fe, Mg and Cr from deep sources. The melts of primary inclusions are mainly Ca- and F-rich and those of secondary inclusions tend to become Si-rich. During this evolution process, the melts and iron daughter minerals decreased and even vanished. These facts reveal that the evolution of the primary mineralizing fluids and the differentiation of the fluids and melts are the main factors leading to the deposition of Fe, Sn and other elements. This discovery confirms the magmatic genesis of the HSID and has filled in the gaps in the research of magmatogenic skarn deposits and furnished new methods for such research. Furthermore, it has enlarged the scope of the research on fluid inclusions.
文摘Abstract: The physico-chemical conditions under which the pegmatite dyke No. 3 was formed were discussed in the light of fluid-melt inclusion evidence. Our results lend support to the frac-tionation of hydrothermal solutions from magma. For the pegmatite dike No. 3, the magma-derived hydrothermal solutions are dominated by NaCl + CO2 + H2O.
基金supported by the National Natural Science Foundation of China(Grant No.49873012)the National Climbing Program of China(Grant No.95-Y-25)Visiting Scholarship of the State Key Laboratory of Metallogeny,Nanjing University.
文摘Many light rare earth deposits,such as Maoniuping,Dalucao,Panzhihua deposits,are collectively distributed in Panxi rift of Sichuan Province,China,and closely associated with the aegirine quartz syenite-carbonatite complex.Carbon and oxygen isotope studies demonstrate that the carbonatites in the complex are of typical igneous origin related to mantle processes.Electronic microprobe studies show that the fluid-melt inclusions found in the comples are enriched in light rare earth elements(LREE),which suggest that the magma was rich in LREE and could serve as the ore source for the regional LREE mineralization. Both the aegirine quartz syenite-carbonatite complex and the LREE mineralization found therein were derived from the mantle. The rare gas isotope analyses also support that there is a genetic association between the LREE mineralization and mantle processes.
文摘The Hetai ductile shear zone-hosted gold deposit occurs in the deep-seated fault mylonite zone of the Sinian-Silurian metamorphic rock series. In this study there have been discovered melt inclusions, fluid-melt inclusions and organic inclusions in ore-bearing quartz veins of the ore deposit and mylonite for the first time. The homogenization temperatures of the various types of inclusions are 160℃, 180-350℃, 530℃ and 870℃ for organic inclusions, liquid inclusions, two-phase immiscible liquid inclusions and melt inclusions, respectively. Ore fluid is categorized as the neutral to basic K\++-Ca\+\{2+\}-Mg\+\{2+\}-Na\++-SO\+\{2-\}\-4-HCO\+-\-3-Cl\+- system. The contents of trace gases follow a descending order of H\-2O>CO\-2>CH\-4> (or <) H\-2>CO>C\-2H\-2>C\-2H\-6>O\-2>N\-2. The concentrations of K\++, Ca\+\{2+\}, SO\+\{2-\}\-4, HCO\+-\-3, Cl\+-, H\-2O and C\-2H\-2 in fluid inclusions are related to the contents of gold and the Au/Ag ratios in ores from different levels of the gold deposit.This is significant for deep ore prospecting in the region. Daughter minerals in melt inclusions were analyzed using SEM. Quartz, orthoclase, wollastonite and other silicate minerals were identified. They were formed in different mineral assemblages. This analysis further proves the existence of melt inclusions in ore veins. Sedimentary metamorphic rocks could form silicate melts during metamorphic anatexis and dynamic metamorphism, which possess melt-solution characteristics. Ore formation is related to the multi-stage forming process of silicate melt and fluid.
文摘Abundant fluid-melt inc1usions are found in the aegirine-augite-barite pegmatite andcarbonatite veins in the Mianning REE deposit, Sichuan. They were trapped in early stage flu-orite and quartz from a salt-melt system at temperatures higher than 500℃. Meanwhile, fluidinclusions are also present in large amounts in bastnaesite. Homogenized between 150 and270℃, these inclusions are thought to be representative of the physiccrchemical conditions ofREE minera1ization. These results show that the Mianning REE deposit is of tyPical hy-drothermal origin developed from a salt-melt system.
