1 Outline of the Yangtze terrain THE northwestern area of Sichuan and the joined area of Yunnan, Guizhou and Guangxi are the two majorfields where lots of Carlin-type Au ore deposits are located. Both of them belong t...1 Outline of the Yangtze terrain THE northwestern area of Sichuan and the joined area of Yunnan, Guizhou and Guangxi are the two majorfields where lots of Carlin-type Au ore deposits are located. Both of them belong to the western area ofYangtze terrain. The evolution of Yangtze terrain affected profoundly the geological evolution in these areas. Many epithermal ore deposits, such as Carlin-type gold, lead, zinc, mercury, stibium and arsenic,occur in the these areas, due to the evolution of crust in Yangtze terrain. The foundation of Yangtze terrain shows a structure of three stories, mainly composed of the Proterozoic clastic rocks and carbonic rocks that were involved in low-middle grade metamorphose. The meaningof the Yangtze terrain changed according to several geological times, which can be said that the activity ofYangtze terrain changed in the past. The Yangtze terrain undertook several processes of landmass hyper-展开更多
GOLD mineralization and Sedex-type base metal mineralization (SBM) have been separately studied for along period. This may lead geologists to ignore the important exploration meaning of SBM in goldprospecting. A typic...GOLD mineralization and Sedex-type base metal mineralization (SBM) have been separately studied for along period. This may lead geologists to ignore the important exploration meaning of SBM in goldprospecting. A typical example is related to the Carlin-type gold ore deposits, in the study of which, Hg,As, Sb and other mineralizations have been stressed but SBM has been ignored. 1 A new phenomenon In recent years, it has been discovered that many Carlin-type gold ores and SBM are distributed inthe same geology unit but are disjunctive each other. In Carlin district of USA, Emsbo et al.have reported the Sedex-type Pb-Zn orebody in thedepth of Meikle Au deposit, the same phenomenon has been described in Screamer, Golden April,展开更多
文摘1 Outline of the Yangtze terrain THE northwestern area of Sichuan and the joined area of Yunnan, Guizhou and Guangxi are the two majorfields where lots of Carlin-type Au ore deposits are located. Both of them belong to the western area ofYangtze terrain. The evolution of Yangtze terrain affected profoundly the geological evolution in these areas. Many epithermal ore deposits, such as Carlin-type gold, lead, zinc, mercury, stibium and arsenic,occur in the these areas, due to the evolution of crust in Yangtze terrain. The foundation of Yangtze terrain shows a structure of three stories, mainly composed of the Proterozoic clastic rocks and carbonic rocks that were involved in low-middle grade metamorphose. The meaningof the Yangtze terrain changed according to several geological times, which can be said that the activity ofYangtze terrain changed in the past. The Yangtze terrain undertook several processes of landmass hyper-
文摘GOLD mineralization and Sedex-type base metal mineralization (SBM) have been separately studied for along period. This may lead geologists to ignore the important exploration meaning of SBM in goldprospecting. A typical example is related to the Carlin-type gold ore deposits, in the study of which, Hg,As, Sb and other mineralizations have been stressed but SBM has been ignored. 1 A new phenomenon In recent years, it has been discovered that many Carlin-type gold ores and SBM are distributed inthe same geology unit but are disjunctive each other. In Carlin district of USA, Emsbo et al.have reported the Sedex-type Pb-Zn orebody in thedepth of Meikle Au deposit, the same phenomenon has been described in Screamer, Golden April,
