CHARACTERISTICS OF MAGMATITE AND ITS RELATION TO GOLD MINERALIZATION OF TANJIANSHAN GOLD FIELD

The magmatic rocks in Tanjianshan gold field are mainly intrusires with various features, which made up late Variscian Tanjianshan plagiogranite porphyry complex. The rocks of the complex are the product of comagma during different evolution stages. The complex is commonly altered. The mineralizing alteration is especially strong where the controlling faults cut through. Some of them form orebodies. The evolution sequence of magmatic rocks and gold mineralizing is plagioaplite or granite aplite→ plagiogranite-porphyry (main stage)→quartz diorite(stock) and diorite porphyrite porphyrite(vein)→minette(vein)→granite porphyry(vein)→gold mineraling alteration. The general tendency is tow ards acidic evolution, forming post-magmatic hydrothermal rich in materials, migrating to favourable geologic structure site and precipitating gold.