Study On Metallogenic Regularities And Prediction Of Gold Deposits In Guilaizhuang, Western Shandong Province

Guilaizhuang area is located in Luxi uplift region, east to Tanlu fault. Basic geological and past research data had shown good ore-forming potential in this area.Since the Guilaizhuang gold deposit was found, a series of secondary ore deposits(points) were found in its surrounding, but no new larger breakthrough, so strengthening meticulous research of regional data is of great significance for a secondary breakthrough in prospecting.The study systematically analyzed the geological, geophysical, geochemical and remote sensing data of Guilaizhuang area, it dissected the characteristics of the typical deposits and the detailed research on the ore-controlling factors, summarized the metallogenic regularities, established the comprehensive information prospecting model, selected some favorable metallogenic target areas. The new model is a large correction to the past prospecting direction. The main achievements made in the research are as follows:(1) Generally, diagenesis associated with regional anomaly,metallogenesis corresponding to local anomalies, but in Guilaizhaung area, gold deposits related to regional anomaly of Au element, gold ores were numerously distribution in the place where the gradual changed of the geochemical anomalies or the large gradient of the Au element, and there is no gold deposits(points) in local high-anomaly areas due to lack of structures and inadequate space.(2) The unique tectonic system was formed by the long-term left-lateral slip of Tanlu fault zone, the slip of the Tanlu fault formed numerous smaller secondary fracture in the south of Luxi area, the fault provided channels for early Yanshan upper mantle and deep crust substance and space for the enrichment of the mineral material.(3) The corners of gravity and magnetic anomaly lines and gradual magnetic anomaly shifty areas areeasy to enrich ore-forming materials, upward continuation of gravity can preferably reflect the shape of geological body, the zero lines of the vertical second derivative of the upward continuation gravity with 5 km and 3 km, especially the places where crossing with different height of the zero lines, were fine metallogenic positions. The intersection of remote sensing linear and ring structures and the circular and annular intersection conducive to mineralization’s enrichment.(4) According to prospecting model, four forecasting areas are selected(Shizizhuang, Zhanglidongling,Liujiazhuangbeiling, Lifanggou-Dongdawan), which can be used as the focus of the prospecting direction.