CHARACTERISTICS OF METALLOTECTONICS AND ORE-FORMING STRUCTURAL PLANE IN BAIYUN GOLD DEPOSIT, LIAONING
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摘要: 白云金矿是辽宁省青城子矿集区大型金矿床之一,文章根据矿山资料及野外详细调查,主要对矿区的成矿构造与成矿结构面进行了梳理。成矿构造主要为成矿期活动的断裂和褶皱,利用侵入其中的含矿岩脉(石英斑岩、花岗斑岩、闪长玢岩和煌斑岩)确定成矿期断裂主要为近东西向、北西向和北东向断裂,成矿期的褶皱主要为姚家岭—天桥岭—李家堡子倒转向斜,该倒转向斜是青城子一带印支期岩浆活动形成的推覆构造形成;成矿结构面主要分为四种,即侵入岩与围岩接触面、层间断裂面或接触面、围岩断裂或裂隙面和水压致裂结构面,并从力学角度分析了这四种结构面的产生机制。最后,讨论了在强烈的由南向北挤压应力作用下,含矿热液沿不同的张性裂隙侵位形成不同矿体样式。Abstract: The Baiyun gold deposit is one of the largest ore deposits in the Qingchengzi ore concentrated area, Liaoning. Characteristics of metallotectonics and ore-forming structural planes have been studied comprehensively, based on mineral exploration data and field investigation. Active fractures and folds in ore-forming period become the metalotectonic structures. Fractures can be divided into EW-, NW-and NE-ward fractures based on the injected dikes (such as quartz porphyry, granite porphyry, diorite porphyrite and lamprophyre), and fold is the Yaojialing-Tianqiaoling-Lijiapuzi inverted syncline formed by the thrust derived from Indosinian magmatic activities in Qingchengzi area. Ore-forming structural planes can be divided into four types, namely the contact interface between intrusive rock and surrounding rock, interlayer fracture and lithologic contact interface in the stratum, rock fracture or fissure planes and hydraulic fracturing structure planes. Moreover, formation mechanism of these structural planes was discussed. Finally, it is summarized that ore-bearing hydrothermal fluids flowed along different tensile fracture and formed different ore body patterns under the intense pressure from the south to the north.
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图 2 辽宁青城子地区矿产地质简图(据文献[1]修改)
1—第四系砂砾岩;2—盖县组片岩;3—大石桥大理岩;4—高家峪组变粒岩;5—吕梁期花岗岩;6—印支期花岗岩;7—辉长岩;8—闪长玢岩;9—铅锌矿;10—铅矿;11—银矿;12—金矿;13—向斜/背斜;14—断层褶皱构造:①—白云山背斜;②—石湖沟—青城子向斜;③—尖山沟向斜;④—西青台峪—青城子向斜;⑤—新岭背斜;⑥—头道沟向斜;⑦—榛子沟背斜
Figure 2. Mineral geological structure map in Qingchengzi ore concentrated area (modified from [1])
图 3 辽宁省白云金矿床构造地质图(据文献[14]修改)
1—第四系砂砾岩;2—盖县组片岩;3—大石桥组大理岩;4—斜长角闪岩;5—辉长岩;6—闪长玢岩;7—煌斑岩;8—花岗斑岩;9—石英斑岩;10—矿体及编号;11—背斜;12—向斜;13—倒转背斜;14—倒转向斜;15—断层及编号;16—褶皱编号褶皱:①—白云山背斜;②—阳沟里向斜;③—阳沟-石湖沟背斜;④—姚家沟—天桥沟—李家堡子倒转向斜;⑤—苏家堡子倒转背斜;⑥—顾家堡子倒转向斜断裂:F1—荒甸子—白云—于家堡子断裂;F2—尖山子断裂;F3—王家堡子—车头岭断裂;F4—五羊沟断裂;F5—阳沟断裂;F6—云山断裂;F7—牛圈子—青城子断裂
Figure 3. Tectonic geological map of the Baiyun gold mine (modified from [14])
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