: On the basis of the geological data from 220 intrusions and isotope ages of 115 rock bodies, the paper discusses the distribution of 18 alkaline intrusive rock belts along deep faults and their relations to the plat...: On the basis of the geological data from 220 intrusions and isotope ages of 115 rock bodies, the paper discusses the distribution of 18 alkaline intrusive rock belts along deep faults and their relations to the plate tectonic activity. In view of the presence of a large amount of Variscan alkaline rocks of deep-source character, it is inferred that mantle diapirism was very strong in China during the Variscan. Besides anorogenic and postorogenic alkaline granites, there also occur alkaline granites formed in the terminal orogenic stage when the regional tectonic activity was of compressional nature. Finally, the paper discusses the tectonic environment of the Maoniuping nordmarkite in Mianning county, Sichuan province, and the authors consider it to be a compressional environment originating after rift closing.展开更多
SUPER large gold deposits related to alkaline intrusions have been found in America,Canada,Australia,Papua New Guinea and elsewhere.Dongping gold deposit with superlarge potentialhas also been found in Shuiquangou alk...SUPER large gold deposits related to alkaline intrusions have been found in America,Canada,Australia,Papua New Guinea and elsewhere.Dongping gold deposit with superlarge potentialhas also been found in Shuiquangou alkaline complex intrusions,northwestern Hebei Province,China.One of the keys to resolving the possible genetic relationship between gold deposits andore-host alkaline intrusions is to determine their formation ages.This note dates the Shuiquan-gou intrusions with zircon U-Pb method.展开更多
文摘: On the basis of the geological data from 220 intrusions and isotope ages of 115 rock bodies, the paper discusses the distribution of 18 alkaline intrusive rock belts along deep faults and their relations to the plate tectonic activity. In view of the presence of a large amount of Variscan alkaline rocks of deep-source character, it is inferred that mantle diapirism was very strong in China during the Variscan. Besides anorogenic and postorogenic alkaline granites, there also occur alkaline granites formed in the terminal orogenic stage when the regional tectonic activity was of compressional nature. Finally, the paper discusses the tectonic environment of the Maoniuping nordmarkite in Mianning county, Sichuan province, and the authors consider it to be a compressional environment originating after rift closing.
文摘SUPER large gold deposits related to alkaline intrusions have been found in America,Canada,Australia,Papua New Guinea and elsewhere.Dongping gold deposit with superlarge potentialhas also been found in Shuiquangou alkaline complex intrusions,northwestern Hebei Province,China.One of the keys to resolving the possible genetic relationship between gold deposits andore-host alkaline intrusions is to determine their formation ages.This note dates the Shuiquan-gou intrusions with zircon U-Pb method.
