Dongguashan deposit is a large porphyry-skarn copper（gold） deposit in Tongling ore district. The Qingshanjiao intermediate acid intrusion of Yanshanian had a direct genetic relationship with mineralization. The magm...Dongguashan deposit is a large porphyry-skarn copper（gold） deposit in Tongling ore district. The Qingshanjiao intermediate acid intrusion of Yanshanian had a direct genetic relationship with mineralization. The magma origin, rock-forming dynamic background and rock-forming process were studied, and the rock-forming mechanism of Qingshanjiao intrusion was discussed, based on geological characteristics, detailed observation of petrography and systematic investigation of petrochemistry, trace elements and REE geochemistry characteristics of Qingshanjiao intrusion. The results show that Qingshanjiao rock body belongs to high-K calc-alkaline series with higher LREE elements, Th, Rb and Sr abundance, but depleted in HREE elements, Ba, Nb and Ta. The primary magma originated from the mantle-crust mixtures which were caused by basaltic magma of mantle mixing with syenite magma of partial melting of the lower crust, and the formation environment of Qingshanjiao intrusion was emplaced in the transitional environment from compression to extension. The Harker diagram and hybrid structures of plagioclase and potassium feldspar indicate that the fractional crystallization occurred in the process of magmatic evolution. The petrochemistry, trace elements and REE geochemistry characteristics indicate that the magma was contaminated by crustal material during the rock-forming. These results suggested that the Qingshanjiao intrusion was formed by fractional crystallization and assimilation and hybridization of mantle-crust magma in the transitional environment from compression to extensional.展开更多
Ye Shu-xian＇s proposal of ＂Road of Jade＂ brings forward a new way to study the origin of civilization. Jade replaced bronze as one of the major criterions of the birth of civilizations. Ye explains jade as a mystic...Ye Shu-xian＇s proposal of ＂Road of Jade＂ brings forward a new way to study the origin of civilization. Jade replaced bronze as one of the major criterions of the birth of civilizations. Ye explains jade as a mystical witchcraft which has a sacred power for the ancient people. Because the jade is produced in the water, and has the similar color with the sky, both of which have significance for the origin of life, jade is thus considered to be the origin of power. The notion of jade-god gave birth to the civilization in ancient China and triggered competition among the settlements, which in turn, advanced the development of civilization.展开更多
基金Project(20091100704)supported by the Special Funds for Scientific Research of Land and Natural Resources,ChinaProject(2015CX008)supported by the Innovation Driven Plan of Central South University,China
文摘Dongguashan deposit is a large porphyry-skarn copper（gold） deposit in Tongling ore district. The Qingshanjiao intermediate acid intrusion of Yanshanian had a direct genetic relationship with mineralization. The magma origin, rock-forming dynamic background and rock-forming process were studied, and the rock-forming mechanism of Qingshanjiao intrusion was discussed, based on geological characteristics, detailed observation of petrography and systematic investigation of petrochemistry, trace elements and REE geochemistry characteristics of Qingshanjiao intrusion. The results show that Qingshanjiao rock body belongs to high-K calc-alkaline series with higher LREE elements, Th, Rb and Sr abundance, but depleted in HREE elements, Ba, Nb and Ta. The primary magma originated from the mantle-crust mixtures which were caused by basaltic magma of mantle mixing with syenite magma of partial melting of the lower crust, and the formation environment of Qingshanjiao intrusion was emplaced in the transitional environment from compression to extension. The Harker diagram and hybrid structures of plagioclase and potassium feldspar indicate that the fractional crystallization occurred in the process of magmatic evolution. The petrochemistry, trace elements and REE geochemistry characteristics indicate that the magma was contaminated by crustal material during the rock-forming. These results suggested that the Qingshanjiao intrusion was formed by fractional crystallization and assimilation and hybridization of mantle-crust magma in the transitional environment from compression to extensional.
基金This paper is supported by General Financial Grant from the China Postdoctoral Science Foundation （Grant No.： 2013M542363）.
文摘Ye Shu-xian＇s proposal of ＂Road of Jade＂ brings forward a new way to study the origin of civilization. Jade replaced bronze as one of the major criterions of the birth of civilizations. Ye explains jade as a mystical witchcraft which has a sacred power for the ancient people. Because the jade is produced in the water, and has the similar color with the sky, both of which have significance for the origin of life, jade is thus considered to be the origin of power. The notion of jade-god gave birth to the civilization in ancient China and triggered competition among the settlements, which in turn, advanced the development of civilization.
