Pacific-type orogens(fold belts)hosting accretionary complexes are places keeping records of the evolution of paleo-oceans,and formation and transformation of continental crust at their active convergent margins.Pacif...Pacific-type orogens(fold belts)hosting accretionary complexes are places keeping records of the evolution of paleo-oceans,and formation and transformation of continental crust at their active convergent margins.Pacific-type orogeny induces destruction of crustal materials,their subduction to the deep mantle,generation of hydrouscarbonated plumes in the mantle transition zone(MTZ)and its related intra-plate magmatism.We propose a new approach for linking paleo-oceans,active margins and intra-plate magmatism in central and eastern Asia.The approach“stands”on three“whales”:the model of Ocean Plate Stratigraphy(OPS),the parameters of Pacific-type convergent margins and a model of hydrous-carbonated plumes.The OPS model evolved from extensive studies of accretionary complexes in the western Pacific,in particular,in Japan;it allows differentiating oceanic plates of one paleoocean and evaluating their sizes and ages.An important issue for reconstructing the history of paleo-oceans is to estimate major parameters of the Pacific-type convergent margins:accreting vs.eroding,geometrical length,and life time.For the eroding margins we must define major periods of tectonic erosion and transportation of oceanic and continental materials to the deep mantle and evaluate a possibility of their accumulation in the MTZ.All this would allow us to develop a holistic model linking the evolution of paleooceans,the accretion and erosion of oceanic and continental crust materials at Pacific-type convergent margins,mantle metasomatism and intra-plate magmatism.展开更多
Gold Headquarter of the CAPF has discovered the Yangshan super large-scale gold deposit in Gansu Province, which is a great breakthrough of gold exploration and prospecting in Western Qinling Mountains of China. The g...Gold Headquarter of the CAPF has discovered the Yangshan super large-scale gold deposit in Gansu Province, which is a great breakthrough of gold exploration and prospecting in Western Qinling Mountains of China. The gold resources of this deposit achieved 308 tons with increasing potentials. Preliminary geological investigations indicate that the Yangshan gold deposit is located in the intra-continental collision orogenic belt; and the deposit was formed during the continent-continent collision orogenic processes. The geological characteristics of the deposit are similar to that of the typical Carlin-type gold deposits, while differences still exist. The ore-forming background is notably different from the Carlin gold deposit province in the United States; and the ore-forming fluids are similar with that of the orogenic-type gold deposit. Accordingly, the Yangshan gold deposit is a transitional type between the Carlin-type and the orogenic type gold deposits. At present, the Yangshan gold deposit is the largest Carlin and Carlin-like type gold deposit that is ever discovered in China. Researches on metallogeny, metallogenic model and ore-enrichment regularities of the Yangshan gold deposit are crucial to meet the pressing needs of the current geological investigation and ore exploration of the deposit.展开更多
基金This work evolved from UNESCO-IUGS IGCP#592 project“Continental construction in Central Asia”(2011-2016)is currently supported by the Ministry of Education and Science of the Russian Federation,grant#14.Y26.31.0018Additional support came from the Russian Foundation for Basic Research(grant#16-05-00313)and Scientific Projects of IGM SB RAS no.0330-2016-0003 and 0330-2016-0018。
文摘Pacific-type orogens(fold belts)hosting accretionary complexes are places keeping records of the evolution of paleo-oceans,and formation and transformation of continental crust at their active convergent margins.Pacific-type orogeny induces destruction of crustal materials,their subduction to the deep mantle,generation of hydrouscarbonated plumes in the mantle transition zone(MTZ)and its related intra-plate magmatism.We propose a new approach for linking paleo-oceans,active margins and intra-plate magmatism in central and eastern Asia.The approach“stands”on three“whales”:the model of Ocean Plate Stratigraphy(OPS),the parameters of Pacific-type convergent margins and a model of hydrous-carbonated plumes.The OPS model evolved from extensive studies of accretionary complexes in the western Pacific,in particular,in Japan;it allows differentiating oceanic plates of one paleoocean and evaluating their sizes and ages.An important issue for reconstructing the history of paleo-oceans is to estimate major parameters of the Pacific-type convergent margins:accreting vs.eroding,geometrical length,and life time.For the eroding margins we must define major periods of tectonic erosion and transportation of oceanic and continental materials to the deep mantle and evaluate a possibility of their accumulation in the MTZ.All this would allow us to develop a holistic model linking the evolution of paleooceans,the accretion and erosion of oceanic and continental crust materials at Pacific-type convergent margins,mantle metasomatism and intra-plate magmatism.
文摘Gold Headquarter of the CAPF has discovered the Yangshan super large-scale gold deposit in Gansu Province, which is a great breakthrough of gold exploration and prospecting in Western Qinling Mountains of China. The gold resources of this deposit achieved 308 tons with increasing potentials. Preliminary geological investigations indicate that the Yangshan gold deposit is located in the intra-continental collision orogenic belt; and the deposit was formed during the continent-continent collision orogenic processes. The geological characteristics of the deposit are similar to that of the typical Carlin-type gold deposits, while differences still exist. The ore-forming background is notably different from the Carlin gold deposit province in the United States; and the ore-forming fluids are similar with that of the orogenic-type gold deposit. Accordingly, the Yangshan gold deposit is a transitional type between the Carlin-type and the orogenic type gold deposits. At present, the Yangshan gold deposit is the largest Carlin and Carlin-like type gold deposit that is ever discovered in China. Researches on metallogeny, metallogenic model and ore-enrichment regularities of the Yangshan gold deposit are crucial to meet the pressing needs of the current geological investigation and ore exploration of the deposit.
