Genesis and geological significance of magnetite and ilvaite in Arqiale Pb-Zn-Cu deposit, western Tianshan, Xinjiang, China
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摘要:
阿尔恰勒铅锌铜矿床位于新疆西天山伊什基里克成矿带西南缘,矿体呈层状−似层状赋存于下石炭统阿克沙克组灰岩中。矿区地表及钻探工程尚未揭露成矿岩体,关于该矿床属于沉积喷流(SEDEX)还是矽卡岩型矿床长期存在争议,成矿与岩浆作用的成因联系不明确,直接制约矿区深边部找矿部署。以矿石中识别出的粒状、放射状两世代磁铁矿以及广泛产出的黑柱石为研究对象,开展系统岩矿相学观察与电子探针主量元素分析,厘定矿物形成机制、限定成矿物理化学条件,约束矿床成因,为矿区及区域找矿勘查提供依据。岩相学与地球化学结果表明:2类磁铁矿均具有低Ti、V,高Al、Mn的热液矽卡岩型磁铁矿地球化学特征,Al-Mn-Ti-V图解估算成矿温度200~300 ℃,磁铁矿Mg温度计计算获得平均温度381~392℃,反映中低温热液成矿特征;黑柱石具有低Fe2+、高Mn2+特征,TFeO/(TFeO+MnO)比值为0.86~0.93,属于锰质黑柱石变种,指示成矿流体处于相对氧化环境。结合矿区石榴子石−钙铁辉石−黑柱石−阳起石矽卡岩矿物组合、矿石交代结构以及浅部铅锌向深部铜矿化过渡的元素分带特征,认为阿尔恰勒为受隐伏侵入岩控制的远端矽卡岩型铅锌铜矿床;根据矿化分带规律推测,矿区北部深部具有寻找隐伏接触带铁铜矿体的潜力。
Abstract:ObjectiveThe Arqiale Pb-Zn-Cu deposit is situated on the southwestern margin of the Yishijilik metallogenic belt in the western Tianshan Orogen, Xinjiang, northwestern China. The ore bodies occur as stratiform-stratoid bodies within limestone of the Lower Carboniferous Akshak Formation. No ore-related intrusive bodies have been identified in surface exposures or drill cores in the mining area. Two competing genetic models, i.e., sedimentary exhalative (SEDEX) and distal skarn-type origins, have long been proposed for this deposit. The genetic link between mineralization and magmatism remains unclear, restricting exploration targeting at depth and along the periphery of the deposit. This work aims to resolve this genetic controversy by elucidating mineral-forming mechanisms, constraining ore-forming physicochemical conditions, and determining deposit genesis, providing mineralogical evidence for regional prospecting.
MethodsTwo generations of magnetite (granular and radial aggregates) and abundant ilvaite in the skarn ores were selected for integrated research. Systematic petrographic observations were conducted using transmitted- and reflected-light microscopy, and the major-element compositions of magnetite and ilvaite were determined by electron probe microanalysis (EPMA). Multiple geochemical thermometers, including the Al+Mn-Ti+V discrimination diagram and Mg-in-magnetite geothermometer, were applied to estimate ore-formation temperatures, and major-element ratios in ilvaite were used to evaluate the redox state of ore-forming fluids.
ResultsBoth granular and radial magnetite showed geochemical signatures typical of hydrothermal skarn magnetite, characterized by low Ti and V contents and elevated Al and Mn concentrations. The Al+Mn-Ti+V diagram yielded mineralization temperatures ranging from 200 to 300 °C, whereas the Mg-in-magnetite geothermometer showed average temperatures of 381-392 °C, collectively indicating a moderate- to low-temperature hydrothermal mineralization environment. Ilvaite in the ores was classified as a manganiferous ilvaite variety characterized by low Fe2+ and high Mn2+. Its TFeO/(TFeO+MnO) ratios varied from 0.86 to 0.93, indicating relatively oxidizing conditions of ore-forming fluids. Petrographic observations revealed well-developed skarn mineral assemblages of garnet-hedenbergite-ilvaite-actinolite and pervasive metasomatic ore textures. A distinct vertical metal-zoning pattern was recognized. Shallow levels were dominated by Pb-Zn mineralization, whereas Cu-dominated mineralization prevailed at deeper parts.
ConclusionIntegrated mineralogical and geochemical evidence indicates that the Arqiale deposit is a distal skarn-type Pb-Zn-Cu deposit genetically linked to concealed intermediate-acid intrusions at depth. The metasomatic textures and skarn paragenesis contradict the typical features of SEDEX deposits. According to the observed metal zonation, the deep northern part of the mining area possesses favorable prospecting potential for concealed contact-zone Fe-Cu ore bodies related to hidden magmatic intrusions.
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Key words:
- ilvaite /
- magnetite /
- skarn deposit /
- Arqiale deposit /
- western Tianshan
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图 4 阿尔恰勒矿体典型矿石组构特征
a. 石榴子石矽卡岩被晚期方解石交代;b. 钙铁辉石矽卡岩被后期石英脉穿切;c. 含钙铁辉石、黑柱石和磁铁矿的矽卡岩矿石被方解石交代;d. 硫化物矿石被方解石交代;e. 黄铁矿切穿钙铁辉石矽卡岩;f. 浸染状黄铁矿;g. 脉状闪锌矿切穿黄铁矿集合体;h. 石英脉沿裂隙填充,被晚期方解石穿切;i. 晚期方解石脉穿切含黑柱石和黄铁矿矿石。Py. 黄铁矿;Ccp. 黄铜矿;Sp. 闪锌矿;Gn. 方铅矿;Mt. 磁铁矿;Hd. 钙铁辉石;Ilv. 黑柱石;Ep. 绿帘石;Cal. 方解石;Qz. 石英;Grt. 石榴子石;下同
Figure 4. Typical ore textural and structural characteristics of Arqiale ore body
图 5 阿尔恰勒矿床矿石矿物显微组构特征
a. 叶片状磁铁矿被赤铁矿、黄铁矿和黄铜矿交代;b. 自形黄铁矿被黄铜矿交代和包含;c. 黄铜矿和闪锌矿交代黑柱石,闪锌矿被黄铜矿交代;d. 闪锌矿交代黑柱石,并被石英细脉穿插;e. 方铅矿与闪锌矿、黄铜矿和黄铁矿共生;f. 闪锌矿和黄铜矿交代钙铁辉石;g. 自形石榴子石被石英、方解石和钙铁辉石交代;h. 红棕色闪锌矿被方解石交代;i. 柱状钙铁辉石被闪锌矿交代。Hem. 赤铁矿
Figure 5. Microscopic textural and structural characteristics of ore minerals from Arqiale deposit
图 9 阿尔恰勒铅锌铜矿床磁铁矿w(Ca+Al+Mn)-w(Ti+V)成因判别图(据文献[26])
IOCG. 铁氧化物−铜−金型;BIFs. 条带状硅铁建造型;Kiruna. 基鲁纳型铁矿型
Figure 9. Ca+Al+Mn-Ti+V genetic discrimination diagram of magnetite in Arqiale Pb-Zn-Cu deposit
图 11 w(Al+Mn)-w(Ti+V)温度图解(底图据文献[26]修改)
Figure 11. Al+Mn-Ti+V temperature diagram
图 12 在Pf=Ps=50 MPa,a(H2O)=1,a(Adr)=0.7,a(Fac)=0.8,a(Ilv)=0.7下计算的 Ca-Fe-Si-O-H-C系统的温度相变图(据文献[56]修改)
HM. 赤铁矿−磁铁矿缓冲剂;Pf. 静水压力;Ps. 岩石静压力;NNO. 镍−氧化镍;QFM. 石英−铁橄榄石−磁铁矿;Mag. 磁铁矿;Adr. 钙铁榴石;Fac. 铁阳起石;a. 活度;x(CO2). CO2的摩尔分数; 绿色箭头代表“冷却并趋向还原、CO2活度升高”的退变质流体演化方向
Figure 12. Calculated temperature phase diagram of Ca-Fe-Si-O-H-C system at Pf=Ps=50 MPa, a(H2O)=1, a(Adr)=0.7,a(Fac)=0.8,a(Ilv)=0.7
表 1 阿尔恰勒铅锌铜矿床磁铁矿电子探针分析数据
Table 1. Electron probe microanalysis (EPMA) data of magnetite in Arqiale Pb-Zn-Cu deposit
wB/% 样品编号 MgO CaO TiO2 TFeO SiO2 Al2O3 NiO MnO Cr2O3 V2O3 总计 放射状磁铁矿-1 0.01 — — 91.14 0.19 0.43 — 0.27 — — 92.03 放射状磁铁矿-2 — — 0.02 90.51 0.18 0.71 — 0.32 — — 91.73 放射状磁铁矿-3 0.02 — — 90.67 0.09 0.14 — 0.27 — — 91.20 放射状磁铁矿-4 0.01 — — 90.48 0.36 0.60 — 0.33 — — 91.78 放射状磁铁矿-5 — — — 90.29 0.15 0.44 — 0.32 — — 91.21 放射状磁铁矿-6 0.02 — — 90.11 0.37 1.08 — 0.15 — — 91.73 放射状磁铁矿-7 0.05 — — 90.96 0.19 0.24 — 0.17 — 0.01 91.61 放射状磁铁矿-8 0.04 — — 90.46 0.15 0.20 0.01 0.23 0.01 — 91.10 放射状磁铁矿-9 0.01 — — 92.59 0.02 0.17 0.01 0.24 0.02 — 93.04 放射状磁铁矿-10 — — — 90.37 0.01 0.23 — 0.25 — 0.02 90.88 放射状磁铁矿-11 — — 0.02 90.45 0.01 0.15 — 0.12 0.01 — 90.76 放射状磁铁矿-12 — — 0.02 90.99 0.12 0.90 — 0.14 — 0.05 92.23 放射状磁铁矿-13 0.01 — 0.04 89.99 0.13 0.72 0.03 0.18 — 0.03 91.13 放射状磁铁矿-14 — — 0.02 90.37 0.62 0.44 — 0.25 0.02 0.03 91.75 放射状磁铁矿-15 — — 0.01 90.42 0.22 0.70 — 0.38 0.02 0.04 91.78 粒状磁铁矿-1 — — — 90.02 0.44 0.04 — 0.24 — 0.01 90.76 粒状磁铁矿-2 — — — 90.36 0.70 — — 0.23 — — 91.29 粒状磁铁矿-3 0.03 — — 89.57 0.41 0.02 — 0.22 — — 90.25 粒状磁铁矿-4 — — 0.02 90.07 0.84 0.03 0.02 0.25 — 0.02 91.24 粒状磁铁矿-5 0.03 — 0.02 89.81 1.16 0.06 0.02 0.23 0.03 0.01 91.37 粒状磁铁矿-6 0.01 — 0.05 89.93 1.29 0.02 0.02 0.32 — — 91.64 粒状磁铁矿-7 — — 0.09 90.42 1.00 0.03 — 0.26 — 0.02 91.81 粒状磁铁矿-8 — — — 90.68 0.27 — — 0.24 — — 91.20 粒状磁铁矿-9 — — — 91.08 0.42 0.02 — 0.25 — — 91.77 粒状磁铁矿-10 0.02 — — 91.05 0.30 — 0.01 0.24 — 0.01 91.63 粒状磁铁矿-11 — — — 89.39 0.73 0.01 — 0.26 — 0.01 90.40 粒状磁铁矿-12 — — — 90.12 1.03 0.03 0.04 0.22 — — 91.44 注:“—”表示含量低于检测限,下同 表 2 阿尔恰勒铅锌铜矿床黑柱石电子探针分析数据
Table 2. EPMA data of ilvaite in Arqiale Pb-Zn-Cu deposit
样品编号 Na2O MgO K2O CaO TFeO SiO2 Al2O3 MnO Cr2O3 TiO2 总计 wB/% 黑柱石-1 0.01 0.11 0.02 13.43 47.05 29.59 0.21 5.07 0.03 0.06 95.57 黑柱石-2 — 0.02 — 13.64 47.23 29.33 0.06 6.25 — 0.05 96.58 黑柱石-3 — 0.13 — 13.53 48.87 29.37 0.07 4.92 — 0.04 96.93 黑柱石-4 — 0.23 — 13.74 48.88 29.50 0.06 4.05 — 0.04 96.50 黑柱石-5 0.01 0.03 — 13.76 47.63 29.47 0.03 5.84 — — 96.76 黑柱石-6 0.01 0.06 — 13.82 47.55 29.50 0.06 6.06 0.01 0.02 97.08 黑柱石-7 — 0.16 0.01 13.55 48.06 29.53 0.14 4.55 — 0.03 96.04 黑柱石-8 — 0.44 0.01 13.52 46.35 29.41 0.31 6.51 — 0.16 96.70 黑柱石-9 — 0.22 — 13.48 47.78 29.35 0.10 4.64 0.01 — 95.57 黑柱石-10 0.01 0.23 — 13.63 48.55 29.27 0.18 4.42 — 0.04 96.33 黑柱石-11 0.01 0.23 0.01 13.65 49.36 29.33 0.11 4.05 — 0.01 96.75 黑柱石-12 — 0.15 0.02 13.43 48.41 29.48 0.14 4.89 — 0.01 96.52 黑柱石-13 0.03 0.28 — 13.58 49.46 29.46 0.12 3.88 — 0.08 96.89 黑柱石-14 — 0.21 0.01 13.45 48.94 29.69 0.09 4.28 — 0.01 96.68 黑柱石-15 0.03 0.15 — 13.60 48.58 29.78 0.10 4.29 — — 96.54 以6个阳离子和8.5个氧原子计算的阳离子数 样品编号 Na Mg K Ca Fe2+ Fe3+ Si Al Mn Cr Ti 黑柱石-1 0 0.01 0 0.98 1.73 0.95 2.01 0.02 0.29 0 0 黑柱石-2 — 0 — 0.99 1.64 1.03 1.98 0.01 0.36 — 0 黑柱石-3 — 0.01 — 0.97 1.71 1.04 1.98 0.01 0.28 — 0 黑柱石-4 — 0.02 — 0.99 1.75 1.01 1.99 0.01 0.23 — 0 黑柱石-5 0 0 — 0.99 1.65 1.03 1.99 0 0.33 — — 黑柱石-6 0 0.01 — 0.99 1.63 1.03 1.98 0 0.34 0 0 黑柱石-7 — 0.02 0 0.98 1.74 0.98 2.00 0.01 0.26 — 0 黑柱石-8 — 0.04 0 0.97 1.59 1.01 1.98 0.02 0.37 — 0.01 黑柱石-9 — 0.02 — 0.98 1.73 0.99 2.00 0.01 0.27 0 — 黑柱石-10 0 0.02 — 0.99 1.71 1.03 1.98 0.01 0.25 — 0 黑柱石-11 0 0.02 0 0.98 1.73 1.04 1.97 0.01 0.23 — 0 黑柱石-12 — 0.01 0 0.97 1.72 1.01 1.99 0.01 0.28 — 0 黑柱石-13 0 0.03 — 0.98 1.75 1.03 1.98 0.01 0.22 — 0 黑柱石-14 — 0.02 0 0.97 1.76 0.99 2.00 0.01 0.24 — 0 黑柱石-15 0 0.01 — 0.98 1.76 0.98 2.01 0.01 0.25 — — 表 3 阿尔恰勒矿床与不同热液型铅锌矿床的矿床特征对比
Table 3. Comparison of deposit characteristics between Arqiale deposit and various hydrothermal Pb-Zn deposits
矿床类型 矿体形态 矿石结构构造 矿物组分 围岩蚀变 成矿流体特征 成矿流体来源 资料来源 近端型
矽卡岩囊状、柱状、脉状、透镜体状 交代残余、交代斑状、似海绵陨铁、交代溶蚀等结构,浸染状、块状等构造 金属矿物:磁黄铁矿、黄铁矿、方铅矿、闪锌矿、黄铜矿、辉钼矿、白钨矿;非金属矿物:辉石、石榴子石、绿泥石、角闪石、黑柱石等 矽卡岩化、绿泥石化、硅化、绢云母化、碳酸盐化 100~700 °C,
w等效(NaCl)
为0~60%早期以岩浆水为主,晚期为大气降水和岩浆水的混合 文献
[75-76]远端型
矽卡岩层状、似层状、囊状、透镜状 交代残余、交代斑状、交代假象结构,块状、浸染状等构造 金属矿物:黄铁矿、黄铜矿、闪锌矿、方铅矿、赤铁矿;非金属矿物:石榴子石、阳起石、透辉石、透闪石、萤石、滑石、黑柱石等 矽卡岩化、硅化、绿泥石化、绢云母化、碳酸盐化 100~400 °C,
w等效(NaCl)
为0~25%与近端矽卡岩相似,但成矿流体在运移过程中受地层影响更明显 文献
[75-76]密西西
比河谷型
(MVT)层状、似层状、团块状、串珠状、透镜状、不规则状等 粒状、胶状、交代等结构,浸染状、角砾状、块状、网脉状等构造 金属矿物:闪锌矿、方铅矿、黄铁矿、黄铜矿、白铁矿;非金属矿物:白云石、方解石、重晶石、萤石等 白云岩化、方解化和硅化 50~250 °C,
w等效(NaCl)
为10%~30%盆地流体与硅酸盐矿物和有机质的反应以及与大气降水的混合 文献
[4,75,77]沉积喷
流型(SEDEX)层状、网脉状、脉状、上层下脉 球粒结构和条带状、纹层状、结核状构造 金属矿物:黄铁矿、磁黄铁矿、闪锌矿、方铅矿、黄铜矿、白铁矿、毒砂;非金属矿物:石英、方解石、白云石、长石等 硅化、绢云母化、绿泥石、绿帘石化、白云岩化、电英岩化 60~280 °C,
w等效(NaCl)
为4%~23%海水为成矿流体的主要来源 文献
[75,77]阿尔恰勒 层状−似层状、透镜状、部分具有切层特征 交代、自形−半自形、粗粒等结构,块状、浸染状等构造 金属矿物:磁铁矿、磁黄铁矿、黄铁矿、黄铜矿、闪锌矿、方铅矿;非金属矿物:石榴子石、辉石、阳起石、黑柱石、绿泥石、石英、方解石等 钙铁辉石化、绿泥石化、碳酸盐化、硅化 162~425 °C,
w等效(NaCl)
为0.5%~13%早期以岩浆水为主,晚期为岩浆水和大气降水及层间水的混合 文献[22] -
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