Fault-controlling Distribution of the Guilaizhuang Gold Deposit in Luxi

The Guilaizhuang gold deposit, located in the central of the North China Craton, is the largest gold deposit with low temperature hydrothermal structural-crypto explosive breccia type in this area, which was influenced strongly by Craton destruction and gold mineralization in Late Mesozoic. Based on the study of spatial of F₁ which is the main control in Guilaizhuang gold deposit, we discussed the variation law of fault strike and tendency in different elevations and exploration lines, the regularity of F₁ section of ore-controlling structure, the change rule of breccia size and morphology in cryptoexplosion breccia body. The tectonic stress field and its ore-controlling effect were analyzed, and it was concluded that the fault was subjected to left-lateral tensio-shear stress in metalorganic period. The southern hanging wall of the fault slides down to the east, while the northern footwall moves upward to the west. It has the characteristics that the steep dip plane opened by tension and the gentle inclined plane closed by compression. We found that along the fault F₁ from NE toSW, the orebody and alteration zone became shallow to deep, the fault from steep to gentle, the grain size of breccia increased gradually, and the gold content gradually decreased.