Primary discussion on the temporal-spatial structure and tectonic controls of metallogenic systems

From the view of the temporal and special domain of ore mineralization, the hierarchies and tectonic controls on metallogenic systems are focused to discuss in this paper. Generally, the time limits often correspond to geotectonic cycles or independent tectonic stages for endogenetic metallogenic systems, and those correspond to geological chronologies (era, period, epoch) for sedimentary and metamorphic ones. According to spatial scale, metallogenic systems can be divided into seven hierarchies, which include global, giant, large, normal, sub, filial and sub-filial systems from large to small. And the seven hierarchies correspond to globe, metallogenic domain, metallogenic province, metallogenic belts, ore districts, ore field and ore deposit respectively. Developing of the junior metallogenic system is controlled by the senior one, and they are controlled by multi- metallotectonic systems. According to the above view, this paper expatiated on the type and the temporal-spatial structure of as well as the tectonic controls on the metallogenic systems of iron-copper-gold metallogenic belt along middle-lower reaches of the Yangtze River. The regional faults-magmatic network system was the dominant factor that determined hierarchies of the magma- hydrothermal metallogenic system formed during Yanshanian. And the faults-magma network system in the ore filed had a model of "three-tier structure", which controlled the distribution zoning of the filial metallogenic system. Successively the various intrusive-contact structures made the sub-filial metallogenic system and the ore deposits distinctive. So coupling of the tectonic and the magmatism is the important dynamic mechanism to control the development of the metallogenic systems. And relatively continuous and stable tectonic stress field, as well as ore-forming fluid system, was the favorable conditions that formed large ore fields (deposits) in the area.