The Jinshan gold deposit is located in the Northeast Jiangxi province,South China,which related to the ductile shear zone.It contains two ore types,i.e.the alteration-type ore and the goldbearing quartz vein ore.Rb-Sr...The Jinshan gold deposit is located in the Northeast Jiangxi province,South China,which related to the ductile shear zone.It contains two ore types,i.e.the alteration-type ore and the goldbearing quartz vein ore.Rb-Sr age dating is applied to both gold-bearing pyrite in the alteration-type ore and fluid inclusion in the gold-bearing quartz vein to make clear the time of the gold mineralization of the Jinshan deposit.Analytical results of this study yielded that the age of the alteration-type ore bodies is about 838±110Ma,with an initial 87Sr/86Sr value of 0.7045±0.0020.However,the age of the gold-bearing quartz vein-type ore is about 379±49Ma,and the initial 87Sr/86Sr is 0.7138±0.0011.Based on the age data from this work and many previous studies,the authors consider that the Jinshan gold deposit is a product of multi-staged mineralization,which may include the Jinninian,Caledonian,Hercynian,and Yanshanian Periods.Among them,the Jinninian Period and the Hercynian Period might be the two most important ore-forming periods for Jinshan deposit.The Jinninian Period is the main stage for the formation of alteration-type ore bodies,while the Hercynian Period is the major time for ore bodies of gold-bearing quartz vein type.The initial values of the 87Sr/86Sr from this study,as well as the previous isotope and trace element studies,indicate that the ore-forming materials mainly derived from the metamorphic wall rocks,and the ore-forming fluids mainly originated from the deep metamorphic water.展开更多
The Jinmen copper deposit, which is situated on the northern margin of the Lanping-Simao back-arc basin, western Yunnan Province, is a silver-bearing, high-grade vein-typecopper deposit. Comprehensive element geochemi...The Jinmen copper deposit, which is situated on the northern margin of the Lanping-Simao back-arc basin, western Yunnan Province, is a silver-bearing, high-grade vein-typecopper deposit. Comprehensive element geochemical studies of the host rocks and hydrothermalminerals revealed the regularities in the distribution, mobilization and transport of elementsfrom the host rocks to hydrothermal minerals. In conunction with the fluid inclusion and isotope data, it is suggested that the ore-forming fluid was derived mainly from a deep sourcecharacterized by CO2 enrichment and reduction in nature. It is also suggested that the oreforming materials come largely from a deep sourcel although the contribution of the countryrocks should not be ruled out.It is also found that some hydrothermal minerals are possessed of MREE-enrichment patterns. It is deduced that the REEs in the deep-source ore fluid were transported in the form ofCO2-3 complexes and were deposited in a continental basin （or a hot-spring basin）.展开更多
基金supported by the National Natural Science Foundation of China (No. 41202083, 40373025)the Research Award Fund for Outstanding Middle-aged and Young Scientist of Shandong Province (BS2013HZ024)
文摘The Jinshan gold deposit is located in the Northeast Jiangxi province,South China,which related to the ductile shear zone.It contains two ore types,i.e.the alteration-type ore and the goldbearing quartz vein ore.Rb-Sr age dating is applied to both gold-bearing pyrite in the alteration-type ore and fluid inclusion in the gold-bearing quartz vein to make clear the time of the gold mineralization of the Jinshan deposit.Analytical results of this study yielded that the age of the alteration-type ore bodies is about 838±110Ma,with an initial 87Sr/86Sr value of 0.7045±0.0020.However,the age of the gold-bearing quartz vein-type ore is about 379±49Ma,and the initial 87Sr/86Sr is 0.7138±0.0011.Based on the age data from this work and many previous studies,the authors consider that the Jinshan gold deposit is a product of multi-staged mineralization,which may include the Jinninian,Caledonian,Hercynian,and Yanshanian Periods.Among them,the Jinninian Period and the Hercynian Period might be the two most important ore-forming periods for Jinshan deposit.The Jinninian Period is the main stage for the formation of alteration-type ore bodies,while the Hercynian Period is the major time for ore bodies of gold-bearing quartz vein type.The initial values of the 87Sr/86Sr from this study,as well as the previous isotope and trace element studies,indicate that the ore-forming materials mainly derived from the metamorphic wall rocks,and the ore-forming fluids mainly originated from the deep metamorphic water.
文摘The Jinmen copper deposit, which is situated on the northern margin of the Lanping-Simao back-arc basin, western Yunnan Province, is a silver-bearing, high-grade vein-typecopper deposit. Comprehensive element geochemical studies of the host rocks and hydrothermalminerals revealed the regularities in the distribution, mobilization and transport of elementsfrom the host rocks to hydrothermal minerals. In conunction with the fluid inclusion and isotope data, it is suggested that the ore-forming fluid was derived mainly from a deep sourcecharacterized by CO2 enrichment and reduction in nature. It is also suggested that the oreforming materials come largely from a deep sourcel although the contribution of the countryrocks should not be ruled out.It is also found that some hydrothermal minerals are possessed of MREE-enrichment patterns. It is deduced that the REEs in the deep-source ore fluid were transported in the form ofCO2-3 complexes and were deposited in a continental basin （or a hot-spring basin）.
