Research On The Ore-controlling Factors, The Deposit Genesis And The Tectononic Geochemistry Prospecting Prediction In Yixingzhai Gold Deposit In Shanxi Province

The ore-forming geological conditions, ore-controlling factors and the deposits genesis of Yiyingzhai gold deposit were studied according to the theory and method of the genesis of gold deposits and the metallogenic prediction. The location metallogenic regularity,typical recognition and mineralization of vein of Yixingzhai gold deposit were analyzed. Prospecting targets were predicted on the base of tectononic geochemistry anomaly analysis.The main research findings in this paper are as follows:1. The classifying causes types and typical characteristics of the gold deposits genesis and the theory, method and prospecting model of metallogenic prognosis were summarized in the domestic and foreign present research field.2. The ore-controlling mechanism, the formation mechanism and the relation to mineralization were discussed on the basis of the introduction of region mineralization geology background and deposit geological features on the Yixingzhai gold deposit. The main conclusion shows below: Hewan and Nanmenshan breccia pipes nearby the NW-striking deep fault are shaped early relatively, belonging to the acidic siliceous ingredient production of ultra-hypabyssal magmatic in the late magma stage. Tietangdong and Nanmenshan breccia pipes which are relatively shaped lately are the ultra-hypabyssal auriferous fluid production composed maily by the skarn in the hydrothermal stage after the magma period. Both root in the unified deep magmatic chamber,belonging to differentiation derivatives at different stages in the deep magmatic chamber.3. The relationship between mineralization and formation, structure, magma rock were discussed. The Yanshanian magma rock which was the favorable mother rock was proposed. The gneiss formation which content of Au is high in Wutai group greenstone belt is the source bed; Magma invasion, formation and emplacement of ore-forming body and orebody were controlled by the structure which is the most important factor in mineralization. 4. Location rule of orebody,typical identification mark of orebody,typical mark and factor of ore control of gold mineralization enrichment were synthetically analyzed on the basis of synthetically analyzing ore-controlling factors.5. The Yixingzhai gold deposit related to intermediate-acidic magmas intrusive activity is considered as the typical mesothermal and epithermal gold-quartz marble deposits on the basis of geological characteristics of deposit and ore-controlling factors.The ore-formingprocess also is described.6. According to 100m×20m tectononic geochemistry survey inYixingzhai area and mathematical statistic analysis of data, association near orebodies were Au→Cu, and the optimal indicator elements in corresponding high-middle-low-temperature are Sn,Mo→Cu,Au→Ag,Zn,Sb,As,Hg association abnormity appeared in orebodies' periphery.6 prospecting targets positions were determined on basical research combining investigation and collection of the favorable ore-prospecting information in survey area.The importance of prospecting targets were sequenced. the favorable ore-prospecting information on geology and geochemistry were summarized.