Structural Features Of The Jinqingding Gold Deposit Field And Rules Of Ore-controlling, In Rushan, Shandong Province

Jinqingding gold deposit located in the eastern part of Jiaodong Peninsula.Based on the previous research results,the information provided and our own first-hand information collected in the field of mining,we mainly studyed the structural features and rules of ore-controlling structures of jinqingding gold deposit.This article mainly focused on the basic characteristics of ore-controlling structure,the relationship between ore-controlling structure and orebodies,the relationship between structure zones and mineralization-alteration zones,stress of ore-controlling structure .and then Concluded those:NNE-trending faults is the main structure in the mining field . NNE-trending faults is the ore-controling structure. Jinqingding gold deposit is controled by Jiangjunshi-Qugezhuang fault.The fault’s shape control orebodies’shape.The fault have wavy shape both in strike and tendency.The strength of NNE- trending fault’s deformation have zonality in the plane and steep. In the direction of the vertical fault plane, from the center to the surrounding rock,develop fault clay, conglomerate rock, cataclastic rock, cleavage belt and joint belt. Deformation in vertical have weak - strong - weak - strong changes.Post-fault F1 strike NW, incline NE, angle 56°~ 75°. The fault’s depth distance is longer than its extense distance.The fault has sinistarl expansional-shearing feature, and it develop caves, include complex components. Post-fault of NNE- trending filled by lamprophyre, lamprophyre vein walls are straight and developed horizontal scratches, lamprophyre damage the continuity of ore body, but not growth alteration.Hydrothermal alteration developed in Jinqingding mining field. Hydrothermal alteration mainly included K-feldspar alteration,Silicification,sericitization, phyllic, pyrite phyllic, chloritization, epidotization, carbonation,etc. Hydrothermal alteration has correspondence with structure zones.Fault’s shape control of the ore body shape.In the direction and orientation,ore body shows a wavy shape, on the plane section, NE section of the ore body is thicker than the NNE section.In the vertical,steep occurrence has much ore; ore body is adjacent to the NE direction, The changing of ore production have positive correlation with gold degree and degree of mineralization.According to mineralization conjugate joints and theirs ralation,we conclude that there are two periods stress field: NW-SE-trending compressional stress field and NE-SW–trending compressional stress field.By the contrast between the differential stress and the gold degree of -735m, it is found that when differential stress is high, the gold degree must be low, when differential stress is low, the gold degree must be high. Gold degree has negtive correlation with differential stress.