Abstract:

Through a comprehensive research, the authors put forward that the adjoining areas among Hubei, Anhui and Jiangxi provinces located in the eastern part of the Yangtze reversed S shaped structure in the Huanan Ocean tectonic domain were compounded with the clusters of Tancheng Lujiang fault zone of the Neocathaysian structural system during the Yanshanian period, and thus formed a giant endogenetic ore concentration area accumulated by a huge amount of metals. Therefore, it is called as the E Wan Gan giant ore concentration area, and the polymetals such as W, Cu, Au, Ag, U and Te occupy an important position in China. The research expounded the location and the continental margin arc basin system of Huanan Ocean of the Jinning period, and further explained the geological evolution, the tectonic framework and the mineralization from the Huanan Ocean of the Jinning period and the Yangtze Caledonian South China rift system to VariscanIndosinian epeiric sea since the MesoNeoproterozoic. The paper focuses on discussing the tectonic activity mode, the tectonic composite rock  and ore controlling characteristics of the Yanshannian intracontinental active orogenesis and metallogenetic magmatic explosion. Furthermore, the framework of Yanshannian giant ore concentration area and its spatial distribution of metallogenic belt, metallogenic subbelt, and major ore concentration area and ore field were preliminarily established. On the basis of the research, it is indicated that the geological settings of the Huanan Ocean of Jinning period and its continental marginal arcbasin is the favorable metallogenic foundation, while the firestorm of the multisource metallogenic magma and metallogenic fluids resulting from the Yanshanian intracontinental active orogenesis triggered by the intensive interaction between the Eurasian Plate and the PalaeoPacific Plate is the source of the largescale mineralization; meanwhile, the compounding between the two large structural domains and systems is the cause of the formation of giant ore concentration area.

Key words: ancient Huanan Ocean, intracontinental activization orogenesis, tectonic compounding ore controlling, Hubei Anhui Jiangxi adjoining areas, giant ore concentration area