The Cu - An co - existence ore deposits related to intermediate- acidic volcanic - intrusive complexes are widespread in eastern China. They can be divided into 5 types: (1) sharn type, (2 )porphyry type, (3)vein type...The Cu - An co - existence ore deposits related to intermediate- acidic volcanic - intrusive complexes are widespread in eastern China. They can be divided into 5 types: (1) sharn type, (2 )porphyry type, (3)vein type, (4 )breccia pipe type and (5)stratabound type. All of those have intimate spatial, temporal and genetic relations formed by the Mesozoic tertonicmatic - hydrothermal activities in certain geological environments. The magmatic and Cu-An metallogenic ager were predominately in Late Mesozoic (179-90 Ma), and in the period of 150-120 Ma the ore-forming Processes reached the Peak. The main geological Settings of Cu-An ore-forming Processes are: (1) continental margins, including the Peripheral depression of the continental Plate, (2) deep fault zones in the continental Plate,(3)continental rift belt. The magmatic activities were under the combined control of basement fault (s )and superficial fault (s ), and mostly formed the continental volcanic basins. The regional Cu-An metallogenic zones occur along the deep fault zones in WNW - EW direction,such as the Tongling metallogenic subzone, or in NE-NNE direction, such as the Dexing metallogenic subzone. Most of Cu- An ore deposits are related to subvolcanic stocks consist of quartz diorite, granodiorite, quartz porphyry, andesite porphyry, trachyte porphyry and other rocks, which belong to the calc- alkaline series and the I - type granitoid. The spatial zoning of matals from the center to periphery of the stocks is: CU (Mo )→ Cu,Au→Cu, Ph, Zn,An →Ph, Zn, Ag →Ph, Ag. There is a typical venical metallic zoning (from surface to 3 000m in depth ) in Yinshan Cu-An-Ph-Zn-Ag ore deposit, northeastern Jianxi Province.展开更多
A detailed study of isotope and trace element on the volcanic-intrusive complex in Yanbei, Jiangxi Province is reported.All rocks of the complex have similar crystallization age,relatively high(^(87)Sr/ ^(88)Sr)_i and...A detailed study of isotope and trace element on the volcanic-intrusive complex in Yanbei, Jiangxi Province is reported.All rocks of the complex have similar crystallization age,relatively high(^(87)Sr/ ^(88)Sr)_i and δ^(18)O,high ^(207)Pb/^(204)Pb,lower ε_(Nd)and old Nd model age.They also possess high Rb/Sr and F/ Cl,weak Ce and intense Eu negative anomalies.These characteristics clearly demonstrate that the volcanic- intrusive complex is the product of the evolution of cognate magma,and the initial magma was formed by the partial melting of Early-Middle Proterozoic metasedimentary rocks.展开更多
文摘The Cu - An co - existence ore deposits related to intermediate- acidic volcanic - intrusive complexes are widespread in eastern China. They can be divided into 5 types: (1) sharn type, (2 )porphyry type, (3)vein type, (4 )breccia pipe type and (5)stratabound type. All of those have intimate spatial, temporal and genetic relations formed by the Mesozoic tertonicmatic - hydrothermal activities in certain geological environments. The magmatic and Cu-An metallogenic ager were predominately in Late Mesozoic (179-90 Ma), and in the period of 150-120 Ma the ore-forming Processes reached the Peak. The main geological Settings of Cu-An ore-forming Processes are: (1) continental margins, including the Peripheral depression of the continental Plate, (2) deep fault zones in the continental Plate,(3)continental rift belt. The magmatic activities were under the combined control of basement fault (s )and superficial fault (s ), and mostly formed the continental volcanic basins. The regional Cu-An metallogenic zones occur along the deep fault zones in WNW - EW direction,such as the Tongling metallogenic subzone, or in NE-NNE direction, such as the Dexing metallogenic subzone. Most of Cu- An ore deposits are related to subvolcanic stocks consist of quartz diorite, granodiorite, quartz porphyry, andesite porphyry, trachyte porphyry and other rocks, which belong to the calc- alkaline series and the I - type granitoid. The spatial zoning of matals from the center to periphery of the stocks is: CU (Mo )→ Cu,Au→Cu, Ph, Zn,An →Ph, Zn, Ag →Ph, Ag. There is a typical venical metallic zoning (from surface to 3 000m in depth ) in Yinshan Cu-An-Ph-Zn-Ag ore deposit, northeastern Jianxi Province.
文摘A detailed study of isotope and trace element on the volcanic-intrusive complex in Yanbei, Jiangxi Province is reported.All rocks of the complex have similar crystallization age,relatively high(^(87)Sr/ ^(88)Sr)_i and δ^(18)O,high ^(207)Pb/^(204)Pb,lower ε_(Nd)and old Nd model age.They also possess high Rb/Sr and F/ Cl,weak Ce and intense Eu negative anomalies.These characteristics clearly demonstrate that the volcanic- intrusive complex is the product of the evolution of cognate magma,and the initial magma was formed by the partial melting of Early-Middle Proterozoic metasedimentary rocks.
