Fluid inclusion constraints on the origin of the Zhengguang gold deposit, Heihe City, Heilongjiang Province
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摘要:
黑龙江省黑河市争光金矿床位于大兴安岭东北缘的多宝山矿集区，矿体呈脉状产于闪长岩体与中奥陶统多宝山组凝灰岩的接触带，受断裂构造控制。流体成矿作用可分为4个阶段：石英-黄铁矿阶段、石英-多金属硫化物阶段、方解石-石英-硫化物阶段、碳酸盐阶段。其中阶段2和3具有复杂的金属硫化物组合并含金，即黄铁矿-闪锌矿-方铅矿-黄铜矿±自然金。石英及方解石中流体包裹体类型单一，主要为气液两相水溶液包裹体，大小集中于3~15μm，气液相比集中于5%~10%。包裹体均一温度介于119~305℃，盐度集中于0.3%~10.4% NaCleqv，密度介于0.76~0.99g/cm3。从阶段2至阶段4，流体均一温度从150~220℃，经140~190℃，降为130~150℃。综合矿床地质特征和成矿流体研究，认为争光金矿床属低硫型浅成低温热液矿床。
Abstract:The Zhengguang gold deposit, Heihe City, Heilongjiang Province, is located in the Duobaoshan metallogenic belt in the northeastern Great Hinggan Range. The Au-bearing veins occur in the contact zone between diorite pluton and the Middle Ordovician Duobaoshan Formation, and are controlled by faults. Hydrothermal mineralization can be divided into four stages, i.e., quartz-pyrite stage (1), quartz-polymetallic sulfide stage (2), calcite-quartz-polymetallic sulfide stage (3) and carbonate stage (4), with stages 2 and 3 as the main Au mineralization stages and characterized by complicated metallic mineral assemblage of pyrite-sphalerite-galena-chalcopyrite±native gold. Fluid inclusions in quartz and calcite are aqueous (NaCl-H2O) inclusions and 3~15μm in size, with bubbles accounting for 5vol%~10vol%. These inclusions yield total homogeneous temperatures of 119~305℃, salinities of 0.3%~10.4% NaCleqv, and densities of 0.76~0.99g/cm3. The homogeneous temperatures of fluid inclusions decrease gradually, from 150~220℃ at stage 2, through 140~190℃ at stage 3, to 130~150℃ at stage 4. Based on the geological and fluid inclusion features, we conclude that the Zhengguang deposit is a typical low sulfidation epithermal deposit.
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Key words:
- Fluid inclusion /
- Epithermal deposit /
- Low sulfidation /
- Zhengguang gold deposit /
- Heilongjiang Province
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图 1
多宝山矿集区构造位置(a) 及区域地质图(b)(据葛文春等, 2007; 黑龙江齐齐哈尔矿产勘查开发总院, 2007①修改)
Figure 1.
The location (a) and regional geology (b) of the Duobaoshan metallogenic belt, showing the location of the Zhengguang depist (modified after Ge et al., 2007)
图 2
争光金矿床地质图(a、b) 及矿体剖面图(c)(据齐齐哈尔总院, 2007修改)
Figure 2.
Geological map of the Zhengguang gold deposit (a, b) and cross section (c)
图 5
不同阶段流体包裹体均一温度(a-c) 和盐度(a′-c′) 直方图
Figure 5.
Homogenization temperatures (a-c) and salinities (a′-c′) histograms of fluid inclusions from different mineralization stages
图 6
争光金矿床流体包裹体拉曼图谱
Figure 6.
Raman spectra of fluid inclusions from the Zhengguang gold deposit
图 7
争光金矿床各成矿阶段包裹体盐度-均一温度图
Figure 7.
Salinity-homogenization temperature plots of fluid inclusions from the Zhengguang gold deposit
图 8
争光金矿床成矿流体δD-δ18O图(武子玉等, 2006)
Figure 8.
δD-δ18O plots of ore-fluid from the Zhengguang gold deposit (cited after Wu et al., 2006)
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