| 遵义黄家湾Ni-Mo多金属矿床成矿流体特征:来自方解石流体包裹体、REE和C、O同位素证据 | |
| Alternative Title | Feature of ore-forming fluid: Evidence from fluid inclusion, REE and carbon-oxygen isotope geochemistry of calcite from Huangjiawan Mo-Ni polymetallic ore deposit, Zunyi, Guizhou Province |
冯彩霞 ; 池国祥; 胡瑞忠; 刘燊; 刘家军; 罗泰义; 齐有强
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| 2011 | |
| Source Publication | 岩石学报
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| Volume | 27Issue:12Pages:3763-3776 |
| Abstract | 黄家湾矿床是近几年在贵州遵义地区寒武系底部黑色页岩中新发现的以Ni-Mo为主的多元素矿床,本文首次对该矿床成矿阶段方解石的流体包裹体、REE和C、O同位素组成特征进行了系统研究。研究结果显示:(1)该矿床成矿阶段方解石中含有3种类型的流体包裹体:富液相气液两相水溶液包裹体;富气相气液两相水溶液包裹体;纯液相包裹体。它们的气相分数变化较大,显示成矿过程中可能发生过沸腾作用。流体包裹体的显微测温结果显示,成矿流体的冰点温度为-11.6～-5.5℃,流体盐度变化范围为8.55%～15.57%NaCleqv,均一温度为109.0～181.8℃,对应流体密度为0.97～1.44g·cm-3;(2)遵义黄家湾钼-镍多金属矿床中与成矿期有关的方解石的稀土总量高且变化范围宽(39.9×10-6～275×10-6),配分曲线为轻稀土富集((La/Yb)N=29.6～63.3)的右倾型,且铕正异常明显(Eu/Eu*为2.14～14.8),与现代海底热液矿床中方解石的稀土特征类似;(3)同位素测定显示成矿流体的碳氧同位素组成分别为δ13CV-PDB=-6.3‰～-5.7‰,δ18OV-SMOW=15.6‰～16.0‰,计算得到流体水的δ18OV-SMOW-H2O‰平均值变化于-0.97‰～+5.16‰之间。上述综合研究表明:黄家湾Ni-Mo多金属矿床成矿流体主要为海水和地层中的建造水(盆地热卤水),同时由海水演化来的海底热液也参与了成矿过程。成矿流体中的碳可能由深源碳与海相碳酸盐岩共同提供。 |
| Other Abstract | The Huangjiawan Ni-Mo polymetallic ore deposit occurred in the basal black shale sequence of the Cambrian strata in the Zunyi area, Guizhou Province, China. In order to investigate the sources of ore-forming fluids and the mechanism of mineralization, fluid inclusion, REE, carbon and oxygen isotopes studies have been performed on calcite of the main mineralization stage from the studied area. Three types of fluids inclusions, i. e., liquid-rich two-phase fluid inclusions, gas-rich two-phase inclusions, and pure liquid aqueous inclusions, have been recognized in this study. In addition, different types of inclusions with remarkably varied vapor-liquid ratios exist together, implying that boiling might have occurred during mineralization. Meanwhile, microthermometric measurement of the fluid inclusions show that the ice melting temperatures range from -11. 6 degrees C to -5. 5 degrees C and the corresponding salinities vary from 8. 55% to 15. 57% NaCleqv. The homogenization temperatures range from 109. 0 degrees C to 181. 1 degrees C, with densities from 0. 97g . cm(-3) to 1. 44g . cm(-3). Rare earth element (REE) analyses show that the calcites are characterized by high Sigma REE content (39.9 x 10(-6) similar to 275 x 10(-6)), enrichment in LREE, ((La/Yb)(N) = 29.6 similar to 63. 3), right-inclining chondrite-normalized patterns, and positive Eu anomalies (Eu/Eu* = 2. 14 similar to 14. 8), which are coincident with those of sea-floor exhalative-hydrothermal deposits. Carbon and oxygen isotopic results of the calcites are characterized by delta(18)C(V)-(PDR) = -6. 3 parts per thousand similar to -5. 7 parts per thousand, delta(18)O(V-SMOW) = 15. 6 parts per thousand similar to 16. 0 parts per thousand, and the calculated oxygen isotopic compositions (delta(18) O(V-SMOW-H2O)) of the hydrothermal fluids are from -0. 97 parts per thousand to + 5. 16 parts per thousand, which suggested that the carbon in ore-forming fluids was mainly derived from seawater-derived hydrothermal fluids. Based on the above discussion, we conclude that the ore-forming fluids of Huangjiawan Mo-Ni-polymetallic deposits are mainly composed of sea water and formation water (basin hot brine), and the seafloor hydrothermal fluid evolved from sea water participated ore-forming fluid process. |
| Subject Area | 矿床地球化学 |
| Language | 中文 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/4883 |
| Collection | 矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文 矿床地球化学国家重点实验室 |
| Recommended Citation GB/T 7714 | 冯彩霞,池国祥,胡瑞忠,等. 遵义黄家湾Ni-Mo多金属矿床成矿流体特征:来自方解石流体包裹体、REE和C、O同位素证据[J]. 岩石学报,2011,27(12):3763-3776. |
| APA | 冯彩霞.,池国祥.,胡瑞忠.,刘燊.,刘家军.,...&齐有强.(2011).遵义黄家湾Ni-Mo多金属矿床成矿流体特征:来自方解石流体包裹体、REE和C、O同位素证据.岩石学报,27(12),3763-3776. |
| MLA | 冯彩霞,et al."遵义黄家湾Ni-Mo多金属矿床成矿流体特征:来自方解石流体包裹体、REE和C、O同位素证据".岩石学报 27.12(2011):3763-3776. |
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