THE CHARACTERISTICS OF ORE CONTROLLING STRUCTURE AND DEEP MINERALIZATION PROGNOSIS OF THE Q240 VEIN IN XIAOQINLING GOLD FIELD
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摘要: 对小秦岭金矿田Q240号矿脉进行构造与矿化蚀变特征分析研究，结果表明该脉体经历了多期构造活动改造。构造带早期以左行脆韧性剪切变形为主，发育北西走向石英脉，其构造线理倾伏向南西，石英脉中矿化特征以黄铁矿为主，呈条带状分布；而后期右行脆韧性剪切变形则形成北东东走向的黄铁矿石英脉。对3个矿体平面上变化特征的分析表明，矿体被多期构造-热液活动叠加，主成矿构造应该与北东走向的左行剪切变形相关，并在后期遭受了右行走滑变形改造，以北东东走向的缓倾结构面为容矿空间。结合应力环境和控矿规律以及矿体侧伏特征，依据构造蚀变特征，认为矿体在走向和倾向上均有似等距规律。据此，在Q240矿脉深部圈定出3处成矿靶区。Abstract: The research on structure and mineralization alteration of Q240 vein in Xiaoqinling gold deposit indicates that the vein undergoes multi-stage tectonic activity transformation. In the early stage, structural belt undergone mainly left-lateral brittle ductile shear deformation, and developed NW-trending quartz vein with the structure lineation plunging toward SW. Mineralization of the vein was characterized by the rich pyrite with a strip distribution. While the later right-lateral brittle ductile shear deformation formed the NEE-trending pyrite quartz vein. By analyzing the change characteristics of three orebodies in the plane, we know that the vein is constructed by multi-superimposed tectonic hydrothermal activity and the main structure is associated with the left-lateral shear deformation, and later suffered the right-lateral deformation. The NEE-trending structure plane forms a space for mineralization. Combined with stress environment, ore control regularity and orebody lateral characteristics, we get that the ore body appear equidistant regularity in the strike and dip based on the structure alteration. According to the research, we predict three mineralization targets in the deep of Q240 vein.
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Key words:
- Xiaoqinling gold field /
- fault structure /
- the Q240 vein /
- deep prognostication
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图 3 Q240矿脉北东段地表构造特征
Figure 3. Surface structure characteristics in the north-east part of the Q240 vein
图 4 Q240矿脉① 号矿体两期石英脉构造关系
Figure 4. Structure relationship between the two phase of quartz veins in No.1 orebody of the Q240 vein
图 5 Q240矿脉② 号矿体构造特征
Figure 5. Structure characteristics of No.2 orebody of the Q240 vein
图 6 Q240矿脉③ 号矿体构造特征(YD1280)
Figure 6. Structure characteristics of No.3 orebody of the Q240 vein
图 7 Q240矿脉② 号矿体构造蚀变特征
Figure 7. Structural alteration characteristics of No.2 orebody of the Q240 vein
图 8 Q240号矿脉成矿期构造运动特征
Figure 8. Characteristics of tectonic movement during the period of mineralization of the Q240 vein
图 9 Q240矿脉控矿应力分析平面与剖面示意图
Figure 9. Controlling stress analysis of the Q240 vein in plane and profile
表 1 Q240号矿脉矿体特征统计表
Table 1. Orebody characteristics of the Q240 vein
矿体编号 规模 金品位/10-6 矿体形态 产状 走向长度/m 延深/m 厚度/m 一般 平均 一般 平均 ① 190 140 0.65~1.00 0.82 3.27~20.53 9.46 脉状 130°∠73° ② 500 173 0.40~1.00 0.76 2.25~20.67 7.54 脉状 310°∠75° ③ 150 100 0.30~1.03 0.71 1.95~10.52 10.23 脉状 130°∠78° 
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表 2 矿石矿物成分表
Table 2. Ore mineral composition
矿物分类 金属矿物 非金属矿物 原生矿物 表生矿物 原生矿物 混入矿物 主要矿物 黄铁矿 褐铁矿 石英 绢云母 次要矿物 方铅矿、黄铜矿 铜蓝 菱铁矿、白云母 方解石 微量矿物 磁铁矿、白钨矿、磁黄铁矿、斑铜矿、闪锌矿、辉钼矿 赤铁矿、针铁矿、白铅矿、孔雀石 重晶石、含铁方解石、微斜长石、锆石 白云母、角闪石、黑云母、绿泥石、绿帘石、长石
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表 3 矿石中化学成分表
Table 3. Chemical composition in the ore
Ag Al2O3 B Ba Be CaO Cd Ce Co Cr Cu Tfe2O3 Ga Hf K2O La Li MgO Mn Mo ＜1 740000 80 760 - 610000 ＜1 50 25 200 30 690000 40 5 310000 25 10 360000 1700 20 Na2O Nb Ni S Pb Rb Sb Sc Sn Sr Ta Th Ti V W Y Zn Zr Hg SiO2 1000 ＜1 100 2300 60 15 - 15 ＜1 750 ＜1 20 1000 70 ＜1 15 80 25 / 100000
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