Metallogenic Prognosis Of Gold Deposit In The Tongshi Area,western Shandong

Tongshi area is located in the West Shandong Rise, which is in the west-side of Yimu fault zone. Crystalline basement is composed of the new Archean Taishan Group metamorphic rocks and Archean-Early Proterozoic granite; cap-rocks are mainly constituted by Palaeozoic Cambrian and Ordovician carbonate rocks. Yanshanian dioritic-monzonitic multi-phase intrusion forms the Tongshi complex, which controlled the distribution of gold deposits in this area. The mineralization types in the area are mainly crytoexplosive breccia, carbonate rock-like micro-disseminated, porphyritic, quartz vein, skam and so on. The gold deposit in this area is undiscovered in last century, and it has good prospects for mineralization. In order to reduce the prospecting target areas, improve exploration efficiency and cut down investment risk of prospecting, prediction of gold mineralization was performed in Tongshi area.Firstly, this prediction collects geological, geophysical, geochemical and remote sensing data to analyze, establish ore-forming models. Applying the theory of similar analogy prediction, mantle mineralization. preliminarily delineate target area. Finally, sampling was implemented in the field.Projections are based on:①The contact zone of Cambrian, Ordovician carbonate rocks and mineralized intrusion;②Groups of faults related to mineralized intrusion;③The intrusive breccia or hidden explosive breccia pipe at the edge mineralized intrusion;④Gravity and magnetic anomaly transition zone;⑤Geochemical anomaly areas, particular combination of multi-element anomalies.Delineated three forecast targets: Guilaizhuang-Zengjiazhuang, Mofanggou- Yingziwa, Dapinganzhuang-Maoyu. Predicted the metallogenic depth of the forecast target. In the delineated targets, Dapingan and Maoyu gold points have the value of further investigation.