Study On Structure And Sub-volcanic Metallogenic System In North Region Of Shanxi

The north region of Shanxi, which belongs to Hengshan-Wutaishan mountain system, locates in the intersection region among the north of Huabei ancient continent, the Inner Mongolian crustal block(the Inner Mongolian earth axis) and Yanliao taphrogenic trough(rift belt). In the region, there are good metallogenic conditions due to the complex geology structure and the wide distribution of magmatite. In this dissertation, by studying the structure and its control on rock and mineral, the region geology structure and sub-volcanic rock system are studied on basis of the great deal of fieldwork by the regional metallogenesis theory.Firstly, regional geology structure, its evolution, and its control on various minerals are summarized in study area and the conception of the net fault system is presented through studying the distribution character of structure in the north region of Shanxi. According to the character of control on rock and mineral of the primary net fault and the secondary net fault system, a conclusion is summeried that the regional strata and the magmatic distribution are controlled by the primary net fault system which is the main control-rock structural system, and the transmitting mineral structure and mineral reserve structure is mainly controlled by the secondary net fault system.Secondly, the distribution character of the sub-volcanic rock of Yanshan period, the geology character of rock body, the chemical character of rock and the geochemical character of rare-earth elements and isotopic elements are explained systemically and the sub-volcanic rocks in the stage of Yanshan is grouped under nine heads and two series according to its genesis, the assembly of rock, the mineral component, its rock chemical, the trace element, the rare-earth element and the isotope, et al.Lastly, metallogenesis system of sub-volcanic rock in the stage of Yanshan is discussed in terms of crust-source and crust & mantle-source, and representative mineral deposit and metallogenesis system of porphyry, breccia subvolcanic rocks and multi-stock, which fall into crust & mantle-source, are explained.The structure,the sub-volcanic metallogenesis system framework map and the mineralization network map are constituted.Structure and the sub-volcanic metallogenesis system are discussed systemically,then the concept of the circular diagenesis-mineralization and the elementary standpoint are put forward.In this paper, the author bringes forward a new genetic idea of the deposit about skarn ore deposit and breccia sub-volcanic deposit related to the sub-volcanic rock in the stage of Yanshan in the study area.Furthermore, the author establishes the metallogenesis model for the Diaoquan silver & copper deposit and the Zhijiadi silver deposit, and has applied the idea to the actual geological works.