| 辽宁青城子铅锌银金矿田控矿构造与找矿方向 |
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| 引用本文：.2001.Ore-control Structures and Ore Prospecting in the Qingchengzi Pb-Zn-Ag-Au Orefield, Liaoning Province[J].Mineral Deposits,20(2):147~152 |
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| 基金项目:有色地质总局重点资助研究项目（编号：96D-9） |
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| 中文摘要:辽宁青城子铅锌银金矿田为一处集铅锌银金多个大型矿床于一区的重要成矿集中区。青城子中深构造层次的片麻岩穹窿（或变质核杂岩）构成了该区构造的主体。矿区中由片麻岩穹隆所构成的构造组合控制了矿体的定位、形态以及矿床的规模。青城子片麻岩隆起西南侧的卷曲褶皱翼内北东、北西走向的陡倾斜断裂发育，矿床主要为沿断裂交代充填的脉状铅锌矿，矿床规模较小；片麻岩隆起滑脱伸展翼多层顺层滑脱断裂带，为后期成矿提供了较大的容矿空间，有利于形成规模较大的矿床。 |
| 中文关键词:片麻岩穹窿 成矿 辽宁省青城子 |
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| Ore-control Structures and Ore Prospecting in the Qingchengzi Pb-Zn-Ag-Au Orefield, Liaoning Province |
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| Abstract:The Qingchengzi Pb-Zn-Ag-Au orefield is an ore cluster area where several large deposits occur. The tectonic pattern of the Qingchenzi Pb-Zn-Ag-Au orefield is dominated by a crustal extensional gneiss dome (or metamorphic core complex) at a medium depth. The structural assemblage of the extensional gneiss dome governs the deposition and the shapes of orebodies as well as the sizes of the ore deposits. In the southwest folded limb of the gneiss dome, NE-or NW-striking steep faults are widely distributed and cut the bedding of the metamorphic stratiform formation. The steep faults strictly control the orebodies which are generally of small size. Ore deposits are characterizecf by filling-replacement lead-zinc veins with high-grade Iead and zinc ores occurring within the steep faults. On the basis of' the features of the structures which control the ore-forming activity and shapes of the orebodies, the orebodies are divided into Nanshan-style and Benshan-style. The lead-zinc deposits such as Beilazi, Xiquigou, Mapao, Benshan, Erdaogou, Dadonggou and Nanshan are dominated by filling-replacement vein-like orebodies.1n the extensional slipping limb of the gneiss dome, there are abunclant metallogenic elements in Gaixian Group and Dashiqiao Group in the upper part of the metamorphic stratiform formation, thus favorable for preliminary enrichment. Several interlayer detachment fault zones are well developed in the extensional slipping limb and extend persistently. The faults are normally of large size and likely to provide space for the formation of ore deposits, even large deposits. The ore-forming process was dominated by hydrothermal alteration instead of filling, resulting in the formation of low grade lead-zinc deposits. The major deposits, such as the Zhenzigou lead-zinc deposit, the Gaojiapuzi silver deposit and the Xiaotongjiapuzi gold deposit, are of stratiform or stratoid style in the extensional slipping limb. |
| keywords:extensional gneiss dome, ore-forming process, Qingchenzi, Liaoning Province |
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