Structural graded ore-controlling rule and ore-controlling structural combination pattern of Daliangzi lead-zinc deposit in southwestern Sichuan
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摘要:
大梁子铅锌矿床位于扬子地块西南缘的川西南矿集区内，矿体展布明显受构造控制。针对该矿床构造分级控矿规律与控矿构造组合样式不清的问题，基于矿田地质力学理论与方法，通过不同级别的典型控矿构造力学性质鉴定及不同期次构造筛分，厘清了控矿构造组合样式及其形成机理。研究表明，成矿构造体系为印支晚期NE向构造带，在NW-SE向主压应力作用下，矿床内形成的不同级别构造分级控制了矿床、矿体和矿脉的展布；形成不同尺度的控矿构造组合样式：矿床尺度的走滑为主断裂-褶皱构造组合、矿体尺度的为“多”字型、“入”字型及“黑色破碎带”构造组合。本研究为该矿床深部及外围找矿勘查提供了重要依据。
Abstract:The Daliangzi lead-zinc deposit is located in the southwestern Sichuan ore concentration area in the southwestern margin of the Yangtze block, and the ore body′s occurrence obviously controlled by the structure.Aiming at the problem of unclear ore-controlling rules and combinations of ore-controlling structures, based on the theory and method of ore field geomechanics, through the identification of the mechanical properties of typical ore-controlling structures at different levels and the structural screening of different stages, the ore-controlling structures, assemblages and their formation mechanisms were clarified. The research shows that the metallogenic structural system is the late Indosinian NE structural belt.Under the NW-SE principal compressive stress, the resulting structures of different scales control the occurrence of the ore deposit, ore body and ore vein; At the same time, form various structural assemblages: strike-slip at the deposit scale is dominated by fault-fold tectonic assemblages, and orebody-scale assemblages are "multi-shaped", "in-shaped" and "black fractured zone" structural assemblages.This study provides an important basis for prospecting and exploration in the deep and peripheral parts of the deposit.
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图 1 大梁子铅锌矿区地质简图[12]
∈1l.下寒武统龙王庙组白云质灰岩；∈3c2.上寒武统沧浪铺组上段泥质灰岩；∈3c1.上寒武统沧浪铺组下段石英砂岩；∈3q2.上寒武统筇竹寺组上段页岩；∈3q1.上寒武统筇竹寺组下段石英砂岩；Zbd8.上震旦统灯影组八段条带状白云岩；Zbd7-2.上震旦统灯影组七段2层含磷质白云岩；Zbd7-1.上震旦统灯影组七段1层含磷白云岩；Zbd6-2.上震旦统灯影组六段2层硅质白云岩；Zbd6-1.上震旦统灯影组六段1层条带状白云岩；Zbd5.上震旦统灯影组五段细晶硅质白云岩；Zbd4-4.上震旦统灯影组四段4层含燧石结核硅质白云岩；Zbd4-3.上震旦统灯影组四段3层泥砂质白云岩；Zbd4-2.上震旦统灯影组四段2层砂质白云岩；Zbd4-1.上震旦统灯影组四段1层板状硅质岩；Zbd3.上震旦统灯影组三段砂泥质白云岩；Zbd2.上震旦统灯影组二段含藻白云岩；1.矿体；2.“黑破带”；3.实测断层；4.推测断层；5.构造破碎带
Figure 1. Geological diagram of the Daliangzi lead-zinc mining area
图 2 大梁子铅锌矿床1 944 m中段地质构造图及各级别断裂构造赤平投影图
1.“黑带”；2.震旦系灯影组白云岩；3.矿体；4.“破碎带”；5.断裂；6.地质点及编号; 7.推测断层走向; 8.背斜
Figure 2. Geological structure map of the 1 944 m middle section of the Daliangzi lead-zinc deposit and stereographic projections of fault structures of various levels
图 3 1 944 m中段Z45点断裂素描图
Ⅰ，Ⅱ.矿块编号；j1, j2.节理编号；F24-1, F24-2, F24-3.断裂面编号；下同
Figure 3. Sketch drawing of Z45 point fracture in the middle of 1 944 m
图 4 1 944 m中段Z237点断裂素描图(Ga.方铅矿；Sp.闪锌矿; Cc.方解石)
Figure 4. Sketch drawing of Z237 point fracture in the middle of 1 944 m
图 5 1 944 m中段Z20点断裂素描图
P.透镜体；Dm.白云岩；Ore.矿脉；j.节理；Ⅰ.早期；Ⅱ.晚期
Figure 5. Sketch drawing of Z20 point fracture in the middle of 1 944 m
图 6 1 944 m中段Z227-230点断裂素描图
Figure 6. Z227-230 point fracture sketch in the middle of 1 944 m
图 7 2 004 m中段Z758点断裂素描图
Figure 7. Sketch of Z758 point fracture in the middle of 2 004 m
图 8 1 884 m中段Z770-Z775点断裂素描图
①深灰色-黑色硅质碎裂白云岩；②灰色-深灰色硅质碎裂白云岩；③黑色白云岩胶结棱角状灰白色硅质白云岩角砾；④深灰色-黑色白云岩胶结灰白色硅质白云岩角砾；Ⅰ.深灰色硅质碎裂白云岩，含灰白色次棱角状硅质白云质角砾；Ⅱ.黑破带(黑色含炭质，非常破碎)，见细脉状方解石，无角砾；Ⅲ.断裂面F3-1(左)与F3-2(右)；Ⅳ.黄铁矿硫化物胶结黑色角砾，见方解石细脉；Ⅴ.F7断裂面；Ⅵ.深灰色-黑色硅质白云岩胶结灰白色强硅化碎裂白云岩角砾；Ⅶ.断裂面F4-1与F4-3；Ⅷ.断裂面F5与F6；Ⅸ.深灰色-黑色白云岩胶结灰白色硅质白云岩角砾；Ⅹ.黑色白云岩胶结棱角状灰白色硅质白云岩角砾；Py.黄铁矿；Sp.闪锌矿；Ga.方铅矿
Figure 8. Z770-Z775 point fracture sketch in the middle section of 1 884 m
图 10 不同中段“黑破带”分布照片
a.“黑带”；b.灰白色强硅化白云岩夹硅质条带状、米黄色、黑色棱角状硅质白云岩角砾；c.铅锌矿脉胶结白色、灰色、浅灰色白云岩角砾；d.灰白色白云岩角砾
Figure 10. Photo of "black broken belt"
图 11 大梁子铅锌矿床构造控矿剖面及平面解析图
Zbd.震旦系灯影组；Pt.中元古界会理群; ∈.寒武系
Figure 11. Structural ore-controlling section and plane analysis diagram of the Daliangzi lead-zinc deposit
图 12 大梁子铅锌矿床1号主矿体群Ⅶ、Ⅷ号矿块与2号矿体群平面图[13]
Figure 12. Plan of No.1 ore body Ⅶ, No.Ⅷ ore body and No.2 ore body of the Dalangzi lead-zinc deposit
表 1 大梁子铅锌矿断裂构造及其矿化蚀变特征简表
Table 1. Summary table of the fault structure and its mineralization and alteration characteristics of the Daliangzi lead-zinc mine
走向 等级 产状 形态特征 力学性质 构造岩特征 矿化蚀变特征 走向/(°) 倾角/(°) 倾向 NW 一级 NW60~70 70~85 SW 舒缓波状、波状、较平直、紧闭 右行张(扭)性-左行扭(压)性 碎裂岩、碎斑岩、碎粒岩、片理化 Py、Lim、Ga、Sp、Dol 二级 NW30~70 60~85 SW 舒缓波状、微波状、平直 右行张(扭)性-左行压(扭)性 碎斑岩、碎粉岩、片理化 Py、Lim、Ga、Sp、Gal 三级 NW30~70 65~85 SW/NE 舒缓波状、波状 张扭性-压扭性 碎裂岩、碎粉岩、碎斑岩、断层泥 Py、Lim、Ga、Sp 四级 NW20~50 60~80 SW/NE 锯齿状、舒缓波状、波状、缓波状 张(扭)性、压扭性、扭性 碎裂岩、碎粉岩、碎斑岩 Lim、Ga NE 三级 NW30~85 30~60 NW 舒缓波状、缓波状、较平直 压扭性 碎裂岩、碎粒岩、碎斑岩、片理化 Py、Ga、Sp、Cal 四级 NW65~70 42~85 SE 舒缓波状、波状、较平直 压扭性 碎裂岩、碎粒岩、碎斑岩、片理化 Py、Lim、Ga、Sp、Cal EW 三级 EW 80~90 S/N 锯齿状、波状 右行扭(张)性 碎粒岩、碎粉岩 Dol 四级 EW 60~85 S/N 舒缓波状、缓波状 压扭性 碎粉岩 Py、Cal、Dol SN 三级 SN 30~55 E/W 舒缓波状、波状 左行扭性-右行扭性 碎裂岩、碎粒岩、碎斑岩 Dol 四级 SN 60~85 E/W 舒缓波状、波状、平直 左行扭(压)性 碎裂岩、碎粒岩、碎斑岩 Py、Cal 注：Py.黄铁矿；Lim.褐铁矿化；Ga.方铅矿；Sp.闪锌矿；Dol.白云石；Cal.方解石 
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