Metallogenic mechanism of the Xiaoxinancha Au-rich Cu deposit in Yanbian area, Jilin Province: Constrains from fluid inclusions and isotope geochemistry
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摘要:
小西南岔富金铜矿床是中国东部陆缘重要的热液矿床，由不同矿石品位和矿体特征的南山、北山两个矿段组成，矿化形式分别为脉状、细脉浸染状。流体包裹体研究表明：北山矿段均一温度为120~470℃，Ⅰ矿化阶段流体盐度为10.1%~20.0% NaCl eqv，Ⅱ、Ⅲ矿化阶段盐度变化大，为0.4%~45.5% NaCl eqv，流体气相成分为H2O、CO2、CH4，少量N2。南山矿段均一温度为150~450℃，Ⅰ成矿阶段盐度为4.0%~11.1% NaCl eqv，Ⅱ、Ⅲ矿化阶段盐度随着温度降低盐度逐渐减小，气相成分主要是H2O、CO2、CH4；似斑状角闪花岗闪长岩石英内流体包裹体与南、北山矿段流体显示相近的均一温度范围（150~510℃）和气体成分，盐度4.9%~11.5% NaCl eqv与南山矿段Ⅰ成矿阶段流体相似。流体包裹体的显微测温、氢氧同位素，稀有气体同位素和Pb同位素结果表明南山矿段的成矿过程为幔源中低盐度流体在围岩裂隙中随着温度、压力降低以充填结晶作用为主而成矿；北山矿段成矿过程为幔源中低盐度流体发生沸腾作用后，与地壳流体混合，随后成矿流体以交代方式成矿，晚阶段两个矿区在大气水的混入作用下，北山矿段形成胶黄铁矿石英脉，南山矿段形成纯硫化物脉；似斑状角闪花岗闪长岩内流体包裹体特征反映了初始含矿流体属性，为中低盐度幔源岩浆热流体。
Abstract:The Xiaoxinancha Au-rich Cu deposit is an important hydrothermal deposit in eastern China. The deposit includes two mines, known as the North mine (veinlet-dissemination type) and the South mine (vein type), which show different ore grades and orebody characteristics. The total homogenization temperatures (Th, total) range from 120 to 470 ° C, and the salinities in the Ⅰ mineralization stage and Ⅱ-Ⅲ mineralization stage are 10.1%-20.0% NaCl eqv and 0.4%-45.5% NaCl eqv, respectively, with the gas composition consisting mainly of H2O, CO2, CH4 and N2 in the North mine. The South mine fluids yield Th, total of 150 to 450℃, salinities of 4.0%-11.1% NaCl eqv in the Ⅰmineralization stage, and the salinities in theⅡ-Ⅲ mineralization stage decrease with the decreasing temperatures, and the main gas composition consists of H2O, CO2, and CH4. The quartz-hosted fluid inclusions in the hornblende-granodiorite have homogenization temperatures of 150 to 510℃, and salinities of 4.9%-11.5% NaCl eqv, being similar to those in the North and South mine. The authors hold that the North mine was formed by replacement of fluids which experienced mixing with crustal fluids in the Wudaogou Group after the boiling, whereas the South mine was mainly formed through filling-crystallization of the initial ore-forming fluids with the decreasing temperatures and pressures, and the ore-forming fluids that involved the meteoric water in the mid-late stage produced melnikovite-quartz veins in the North mine and pure sulfide veins in the South mine. The fluid inclusions in the hornblende-granodiorite possibly reveal initial ore-forming fluid signatures characterized by low-moderate salinity and mantle-derived magmatic fluids.
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Key words:
- fluid evolution /
- metallogenic mechanism /
- Xiaoxinancha Au-rich Cu deposit /
- Yanbian area
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图 7 小西南岔矿床含石盐子晶的流体包裹体气相消失均一对石盐消失均一图解（Th(l-v)=Ts(NaCl)线源自Shepherd et al., 1985）
Figure 7.
图 11 小西南岔矿床Pb同位素构造模式（底图据Zartman et al., 1981）
Figure 11.
图 12 流体包裹体的40Ar*/4He-3He/4He(a), 36Ar/3He-3He/4He(b), 20Ne/22Ne-3He/4He(c)和40Ar/36Ar-3He/4He (d)图解(孙景贵等，2007)
Figure 12.
表 1 小西南岔富金铜矿床流体包裹体显微测温综合分析表
Table 1. Comprehensive analysis of fluid inclusions thermometry at the Xiaoxinancha gold-rich copper deposit
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表 2 小西南岔富金铜矿床流体包裹体内氢氧同位素成分特征
Table 2. Compositions of oxygen and hydrogen isotopes of fluid inclusions from Xiaoxinancha gold-copper deposit
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表 3 小西南岔矿床硫化物普通铅同位素组成
Table 3. The Pb isotope Composition of sulfides from the Xiaoxinancha deposit
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