1 Introduction The early formation and evolution of the North China craton has been widely concerned by scientists.The Bengbu uplift belt is located in the southeast of the craton,theresearch degree of the belt is rel...1 Introduction The early formation and evolution of the North China craton has been widely concerned by scientists.The Bengbu uplift belt is located in the southeast of the craton,theresearch degree of the belt is relatively low and received increasing attention from many scholars in recent years.Through the author’s practical work and combined with展开更多
The Jiangshan gold deposit is the largest,most recently-discovered gold deposit in the Bengbu Uplift.The ore bodies are located in the structural fracture zone of the Zhuangzili Formation(Ar3),with major Pb-Zn and Au ...The Jiangshan gold deposit is the largest,most recently-discovered gold deposit in the Bengbu Uplift.The ore bodies are located in the structural fracture zone of the Zhuangzili Formation(Ar3),with major Pb-Zn and Au reserves.In this study,LA-ICP-MS zircon U-Pb analyses yielded a crystallization age of 111.5±1.8 Ma for the quartz diorite porphyry in Jiangshan.The quartz diorite porphyry has high Ba and Sr content,with low Y and Yb content,which is similar to the characteristics of adakitic rocks.They are enriched in large ion lithophile elements(LILEs,e.g.,Ba,U)and light rare ear th elements(LREEs),while depleted in high field strength elements(HFSEs,e.g.,Nb,Ti)and heavy rare earth element(HREEs).They have zirconεHf(t)values of-23.52 to-21.14(mean=-22.32).and Hf model ages of 2419.76 to 2569.39 Ma.The magma source area is the lower crust.Magma primarily came from the partial melting of the lower crust,with the addition of some mantle material.The quartz diorite porphyries are characterized by high zircon TTi-in-zircon values(608-757°C),Ce^4+/Ce^3+ratios(71.97-1387.10)and Eu/Eu*ratios(0.46-1.08),indicating high temperature and magmatic oxygen fugacities.High temperatures can provide heat to fluids and highly oxidized magmas can control the behavior and speciation of sulfides,thus controlling the behavior of Au.Finally,the ore-forming fluid is enriched and precipitated in a favorable structural space to form the Jiangshan Au deposit.展开更多
基金the project "A study on gold mineralization and prospecting direction in east Anhui province" (item code: 2014-K-5)
文摘1 Introduction The early formation and evolution of the North China craton has been widely concerned by scientists.The Bengbu uplift belt is located in the southeast of the craton,theresearch degree of the belt is relatively low and received increasing attention from many scholars in recent years.Through the author’s practical work and combined with
基金grant-funded by the National Key R&D Program of China(2016YFC0600404)the Key R&D Program of Anhui Province(201904a07020077)the Natural Science Foundation of China(41673040)。
文摘The Jiangshan gold deposit is the largest,most recently-discovered gold deposit in the Bengbu Uplift.The ore bodies are located in the structural fracture zone of the Zhuangzili Formation(Ar3),with major Pb-Zn and Au reserves.In this study,LA-ICP-MS zircon U-Pb analyses yielded a crystallization age of 111.5±1.8 Ma for the quartz diorite porphyry in Jiangshan.The quartz diorite porphyry has high Ba and Sr content,with low Y and Yb content,which is similar to the characteristics of adakitic rocks.They are enriched in large ion lithophile elements(LILEs,e.g.,Ba,U)and light rare ear th elements(LREEs),while depleted in high field strength elements(HFSEs,e.g.,Nb,Ti)and heavy rare earth element(HREEs).They have zirconεHf(t)values of-23.52 to-21.14(mean=-22.32).and Hf model ages of 2419.76 to 2569.39 Ma.The magma source area is the lower crust.Magma primarily came from the partial melting of the lower crust,with the addition of some mantle material.The quartz diorite porphyries are characterized by high zircon TTi-in-zircon values(608-757°C),Ce^4+/Ce^3+ratios(71.97-1387.10)and Eu/Eu*ratios(0.46-1.08),indicating high temperature and magmatic oxygen fugacities.High temperatures can provide heat to fluids and highly oxidized magmas can control the behavior and speciation of sulfides,thus controlling the behavior of Au.Finally,the ore-forming fluid is enriched and precipitated in a favorable structural space to form the Jiangshan Au deposit.
