山东招远大尹格庄金矿控矿构造解析与找矿预测

[研究目的]大尹格庄金矿探明(金:283 t,银:397 t)发育于招平断裂带中段,矿区较大的断裂构造有4条:招平断裂、大尹格庄断裂、南周家断裂与南沟断裂,招平断裂带在矿区内呈NNE20°方向延伸,控制金矿体的形态、产状及发育部位.确定断裂构造的运动方向,可以指导大尹格庄金矿外围找矿预测.[研究方法]本文运用构造解析方...

Analysis on the ore-controlling structures and prospecting in the Dayingezhuang gold deposit,Zhaoyuan,Shandong Province

This paper is the result of mineral exploration engineering.[Objective]The Dayingezhuang gold deposit (explored Au 283 t, Ag 397 t) is located in the middle of Zhaoping fault zone which consist of the Zhaoping, Dayingezhuang, Nanzhoujia, and Nangou faults. The NEE-striking (20°) Zhaoping fault controls the location and shape of the orebodies. Determining the movement direction of faults can guide the prospecting prediction of Dayingezhuang gold deposit. [Methods]In this paper, the kinematic characteristics of main faults are studied by structural analysis method.The Dayinggezhuang, Nanzhoujia, and Nangou faults are post-ore faults and crosscut the Zhaoping fault into four segments. These three faults are NWW-striking, NEE-dipping. The Dayinggezhuang fault crosscut the orebody into two segments. No I orebody in the north and No II orebody in the south are separated by the Dayinggezhuang fault. In the plan view, the distance of the two orebodies is 300-500 m. In the profile, the orebody has a gentle dip and the distance of the two orebodies increase which suggest that the Dayinggezhuang fault is a normal fault. [Results]Owing to the up-to-the down movement, the orebody fall into NE-orientation. [Conclusions]In the light of the similar kinematics between the Dayinggezhuang and Nanzhou faults, we infer the northern of the Nanzhou fault is a beneficial prospecting target. With increasing of depth, the secondary faults develop and control the small gold ore shoot. In the plan view, these secondary faults intersect with the main fault at the angle of 10°-20°. In the profile, these secondary faults parallel with the main fault and have a middle steeply-dipping at 45o. These faults also are beneficial prospecting target.Highlights: Dayingezhuang, Nanzhoujia, and Nangou faults are post-ore faults and normal faults.