Source of Fluid and Genesis of Jinchangzi Gold Deposit in Weiningbeishan, Ningxia: Evidence from Fluid Inclusions and C-H-O Isotopes
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摘要: 卫宁北山地区是宁夏境内最有望实现找矿突破的多金属矿成矿区之一,已发现众多Au、Ag、Cu、Pb、Zn、Fe、Co等矿点或矿化点.金场子金矿是该地区已发现的最大的金矿床,矿体主要赋存在前黑山组及中宁组内的层间断裂破碎带中,呈东西向带状分布,产状与地层近乎一致.区域上除少量闪长玢岩脉出露外,岩浆岩不发育.为了探讨金场子金矿成矿流体性质、来源和矿床成因,对研究区流体包裹体和C-H-O同位素进行了研究.金场子金矿床成矿热液期可划分为4个成矿阶段,从早到晚分别是绢云母-黄铁矿-石英阶段(Ⅰ)、黄铁矿-重晶石-石英阶段(Ⅱ)、多金属硫化物-碳酸盐-石英阶段(Ⅲ)和黄铁矿-碳酸盐阶段(Ⅳ),其中Ⅲ阶段为主成矿阶段.不同成矿阶段的流体包裹体有4种类型,分别是水溶液包裹体、纯CO2包裹体、CO2-H2O包裹体和含子晶多相包裹体.显微测温结果显示,成矿流体的完全均一温度介于171~396 ℃,主要集中于180~270 ℃,盐度介于1.30%~10.99% NaCl equiv,密度为0.24~0.78 g/cm3,为中低温、低盐度、低密度的CO2-H2O-NaCl体系,含有少量N2.热液期石英的δD值为-66.0‰~-32.0‰,δ18OV-SMOW值为+19.7‰~+22.6‰,指示成矿流体为变质流体.C同位素显示,晚阶段(Ⅳ)方解石和菱铁矿的δ13C介于-2.540‰~-0.736‰,表明成矿流体中的C具有混合来源的特点,奥陶系-石炭系陆源碎屑岩和碳酸盐岩的变质脱水作用形成的流体可能是金成矿流体的主要来源.成矿过程中流体发生了明显的不混溶现象,是造成金沉淀的重要因素.矿床成因类型属造山型金矿.Abstract: The Weiningbeishan area is the most promising polymetallic ore target area in Ningxia, where numerous Au, Ag, Cu, Pb, Zn, Fe, Co, and other ore occurrences have been found. The Jinchangzi gold deposit is the largest gold deposit found in the area, and the ore bodies are mainly hosted in the intra-layer fault fractures, with an east-west distribution and near-uniform with the bedding. Magmatism is weak in this district, with several diorite porphyrite having been identified in exposures adjacent to the gold veins. In order to explore the nature, source and genesis of the ore-forming fluid of the Jinchangzi gold deposit, the fluid inclusions and C-H-O isotopes in the study area were studied. The ore-forming hydrothermal period of the deposit can be divided into 4 metallogenic stages, from early to late, they are sericite-pyrite-quartz stage (Ⅰ), pyrite-barite-quartz stage (Ⅱ), polymetallic sulfide-carbonate-quartz stage (Ⅲ) and pyrite-carbonatite stage (Ⅳ), of which stage Ⅲ is the main metallogenic stage. There are four types of fluid inclusions in the mineralization stage, which are aqueous solution inclusions, pure CO2 inclusions, CO2-H2O inclusions and multiphase inclusions containing daughter crystals. The completely homogenous temperature of the ore-forming fluids is between 171-396℃, the salinity is between 1.30%-10.99% NaCl equiv, and the density is 0.24-0.78 g/cm3, which are CO2-H2O-NaCl systems with medium-low temperature, low salinity, low density, CO2 rich, and a small amount of N2. The δD value of hydrothermal quartz is -66.0‰ to -32.0‰, and the δ18OV-SMOW value is (+19.7‰)-(+22.6‰), indicating that the ore-forming fluid is metamorphic and the magmatism is not obvious. The C isotope shows that the δ13C of calcite and siderite in the late stage (stage Ⅳ) is between -2.540‰ and -0.736‰, indicating that C in the ore-forming fluid has the characteristics of mixed sources. The fluids formed by the metamorphic dehydration of Ordovician-Carboniferous terrigenous clastic rocks and carbonate rocks may be the main source of gold ore-forming fluids. During the ore-forming process, the fluids had an obvious immiscibility phenomenon, which was an important factor causing gold precipitation. The genetic type of the deposit is an orogenic gold deposit.
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图 1 研究区大地构造位置(a)与区域地质及矿床(点)空间分布图(b)
1.第四系; 2.新近纪干河沟组; 3.新近纪红柳沟组; 4.古近纪清水营组; 5.白垩纪庙湖山组; 6.石炭纪土坡组; 7.石炭纪臭牛沟组; 8.石炭纪前黑山组; 9.泥盆纪中宁组; 10.奥陶纪狼嘴子组; 11.闪长玢岩脉; 12.断裂/断层及编号; 13.地质界线; 14.铁矿床(点); 15.铜矿床(点); 16.金矿床(点); 17.铅矿点; 18.银、铅矿点; 19.铜、铅、锌矿点; 20.铜、金矿点; 21.铜、银矿点; 22.钴矿化点; 23.铁、钴矿化点; 24.锰、钴矿化点; 25.背斜轴及编号; 26.向斜轴及编号; 27.地名; 28.金矿区位置; a据霍福臣等(1989), 郭佩等(2017)修编; b据海连富等(2020)修编
Fig. 1. Tectonic location (a), regional geology and spatial distribution (b) maps of mineral deposits (points) in the study area
图 3 25号勘探线剖面示意图
金矿化体圈定指标为0.5 g/t金品位; 金矿体为1.0 g/t金品位; 勘探线位置见图 2]
Fig. 3. Schematic diagram of the cross-section of the No.25 exploration line
图 10 研究区金矿床δD-δ18O关系图(底图据Taylor, 1974修改)
Fig. 10. δD-δ18O relationship diagram of gold deposits in the study area(modified from Taylor, 1974)
表 1 金场子金矿主要金矿体特征
Table 1. Characteristics of main gold ore bodies in the Jinchangzi gold dopsit
矿体号 矿体位置 矿体产状 矿体形态 矿体规模(m) 矿体厚度(m) 矿体品位(g/t) 倾向 倾角 长度 斜深 最小 最多 平均 最低 最高 平均 JKT1 25线 180° 82° 透镜体 80 43 - 2.55 2.55 0.64 1.05 0.69 JKT2 25~35线 190°~234° 64°~76° 似层状 280 137~194 0.52 14.98 4.54 0.50 107.90 4.89 JKT3 25~41线 137°~234° 60°~86° 似层状 280 20~225 0.40 9.15 2.73 0.50 29.40 5.91 JKT4 25~41线 173°~228° 67°~84° 似层状 280 10~230 0.67 5.35 2.64 0.58 45.40 4.65 JKT5 15~29线 185°~200° 64°~83° 脉状 300 43~146 0.71 2.43 1.59 0.50 6.39 2.04 JKT6 17~19线 200° 72° 脉状 160 71~152 0.71 5.62 1.85 0.50 14.73 3.47 JKT7 19线 182° 65° 脉状 80 42 - 1.84 1.84 - 0.52 0.52 JKT8 19线 179° 61° 似层状 80 43 1.08 3.23 2.33 0.85 6.64 2.79 JKT9 19线 182° 79° 层状 40 16 - 1.00 1.00 - 22.78 22.78 JKT10 25~27线 265° 19° 似层状 160 195~300 1.15 25.26 11.52 0.52 3.51 1.32 JKT11 75线 13° 85° 透镜体 40 20 1.61 1.61 0.53 6.06 2.13 JKT12 76线 95° 66° 透镜体 - - 1.00 1.00 - 2.57 2.57 JKT13 64线 40° 79° 脉状 - - 0.80 0.80 - 0.95 0.95 JKT14 60线 345° 82° 脉状 45 150~155 - 1.97 1.97 - 6.21 6.21 JKT15 60线 345° 82° 脉状 50 235~240 - 1.22 1.22 - 1.02 1.02 JKT16 39线 165° 60° 脉状 - - - 1.00 1.00 - 0.59 0.59 表 2 金场子金矿不同成矿阶段流体包裹体测温结果
Table 2. Temperature measurement results of fluid inclusions in different metallogenic stages of Jinchangzi gold deposit
成矿
阶段岩石类型 包裹体
类型Tm, ice(℃) Tm, $ {}_{\mathrm{C}{\mathrm{O}}_{2}} $(℃) Tm, clath(℃) Th, $ {}_{\mathrm{C}{\mathrm{O}}_{2}} $(℃) Th, total(℃) 盐度
(%NaCl)密度
(g/cm3)Ⅰ~Ⅱ 石英脉 Ⅰ型 -2.2~-7.4 - - - 171~396 3.69~10.99 0.46~0.57 Ⅲ 多金属硫化物
石英脉Ⅲ型 - -61.5~-56.7 7.0~9.4 24.8~29.8 187~350 1.30~5.30 0.24~0.78 注: Tm, $ {}_{\mathrm{C}{\mathrm{O}}_{2}} $为固相CO2的初熔温度; Th, $ {}_{\mathrm{C}{\mathrm{O}}_{2}} $为CO2的部分均一温度; Th, total为完全均一温度; Tm, ice为冰点温度; Tm, clath为CO2-H2O笼形化合物消失温度. 表 3 金场子金矿床C-O同位素组成(‰)
Table 3. C-O isotopic composition of Jinchangzi gold deposit
样品号 测试矿物 δ18O矿物 δ13C J-3-2 碳酸盐 20.90 -1.033 J-3-4 碳酸盐 19.50 -0.736 JCZ-19-7 碳酸盐 21.70 -1.267 JCZ-19-20 碳酸盐 20.70 -1.077 JCZ-19-21 碳酸盐 23.20 -1.227 H-7 菱铁矿 15.87 -1.720 2501-23 菱铁矿 16.18 -2.540 2501-109 菱铁矿 18.42 -1.737 表 4 研究区金矿床H-O同位素组成(‰)
Table 4. H-O isotopic compositions of gold deposits in the study area
样品号 测试矿物 成矿阶段 δ18O矿物(‰) 温度(℃) δ18O$ {}_{\mathrm{H}} $$ {}_{{}_{2}} $$ {}_{\mathrm{O}} $(‰) δD(‰) 来源 JCZ-19-4 石英 Ⅰ~Ⅱ 20.7 259.8 11.2 -48.0 本文 J-3-4 石英 Ⅰ~Ⅱ 22.6 259.8 13.3 -66.0 J-3-2 石英 Ⅰ~Ⅱ 20.7 259.8 11.2 -48.0 E-1-4 石英 Ⅲ 20.1 240.2 10.7 -32.0 B6010-3 石英 Ⅲ 19.7 240.2 10.3 -59.0 2502-167-8 石英 Ⅲ 20.3 240.2 10.9 -61.0 2502-202 石英 Ⅲ 22.0 240.2 12.6 -66.0 JCZ-5 石英 - 19.17 261.6 10.69 -83.136 艾宁(2014) JCZ-6 石英 - 17.86 240.5 8.39 -81.090 JCZ-9 石英 - 19.02 299.9 12.07 -82.780 JCZ-10 石英 - 19.19 242.8 9.83 -86.071 JCZ-25-1 石英 - 19.65 282.8 12.05 -83.395 JCZ-25-4 石英 - 18.85 281.8 11.21 -82.818 注: δ18Ofluid由公式1 000×lnαquartz-water=3.38×106T2-3.40 ( Clayton et al., 1972 )计算而来.表 5 主要碳储库的δ13C组成
Table 5. δ13C compositions of major carbon storage
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