Abstract:

The Tongshi complex is the most actively metallogenetic for gold mineralization in western Shandong Province. Around it there are four tectonic strata units with different lithological characters, occurrences, geophysical and geochemical features. The Taishan Group characterized by high density, low skipping magnetic field and high gold content can play as gold source. The Paleozoic unit, high density, weak magnetic field and poor in gold, is ore-forming media. The Mesozoic-Cenozoic unit is of low density, low magnetic field as well as poor in gold, which is irrelative to gold mineralization. Whereas, the Tongshi complex, with low density, medium-high skipping magnetic field and rich gold, is the main gold source, dynamic source and forecasting clue. The complex underwent such four stages as porphyrite, porphyry, exploding breccia and dyke, the gold mineralization became intensive with its evolution. By analysis on tectonics, geochemistry and feasibility of every tectonic units around the complex, the conclusion can be drawn that the major gold mineralization took place in the hydrothermal stage at the end of diagenesis and assemble of elements include Au, Ag, V, Sb, Cr. According to gravimetric, magnetic and geochemical anomalies, three zones can been determined around the Tongshi complex. The main gold resource in marginal zone mainly come from mid-low temperature hydrothermal deposits, and from epithermal gold deposits in outer zone. Both can form the marginal and outer metallogenetic zones around Tongshi complex.

Key words: metallogenetic rules, anomaly, prediction, gold deposits, Tongshi complex