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首页> 外文学位 >Hydrothermal geochemistry of the Mount Pleasant Tin (-Tungsten-Molybdenum) deposit.
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Hydrothermal geochemistry of the Mount Pleasant Tin (-Tungsten-Molybdenum) deposit.

机译：芒特普莱森特锡（-钨-钼）矿床的热液地球化学。

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摘要

At Mount Pleasant, New Brunswick, Canada, Sn-rich and W-Mo-rich mineralized zones occur in hydrothermal breccia pipes and granites. Several fluorite types occur associated with Sn, W, and Mo minerals, base-metal sulphides, or are barren of sulphides or oxides. Fluorite associated with Sn and W has complex cathodoluminescence (CL) patterns, suggesting episodic fluid infiltration and interplay among fluids of different character. Other fluorite types have simpler CL patterns, suggesting a less complex fluid environment. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) results show that fluorite associated with W-Mo has higher W/Sn ratios than fluorite associated with Sn mineralization. The rare earth element (REE) content of fluorite associated with Sn, W, and Mo mineralization is higher than other fluorite types. These trace-element data allow discrimination of mineralized and barren assemblages and indicate that the metal endowment reflects fluid chemistry. All fluorite types have flat chondrite-normalized REE patterns with insignificant tetrad patterns, and a negative Eu anomaly, similar to the patterns of the associated Mount Pleasant granites, indicating that fluorite composition reflects that of magmatic fluids. The low REE content of barren fluorite suggests mixing of magmatic and meteoric fluids during the late stages of fluorite deposition.;Fluorite associated with cassiterite contains primary, co-existing, dilute, liquid-vapour and saline liquid-vapour-solid fluid inclusions, with contrasting salinity and homogenization temperatures ( 425 °C, respectively), showing that immiscible liquids coexisted prior to cassiterite precipitation; the temperature differences are interpreted to have resulted from post-entrapment stretching. Cassiterite precipitated from low salinity, low- to moderate-temperature fluids.;Raman spectroscopy, scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), and focused ion beam (FIB) with SEM-EDS showed that solids in LVS inclusions include halite, rokuhnite or hibbingite, douglasite, and hematite, as well as Pb-, Zn-, K-, and Sn-bearing chlorides. The FIB-SEM-EDS analyses demonstrate that halite could be misidentified, resulting in erroneous salinity calculations. LA-ICP-MS and FIB data show that fluid inclusions in fluorite contain abundant Na, K, Fe, Mn, and Zn with lesser Pb, Sn, and W. The application of NaCl-H2O phase equilibria to such a complex fluid would result in inaccurate salinity estimates for saline inclusions.
机译：在加拿大新不伦瑞克省的芒特普莱森特，热液角砾岩管道和花岗岩中富锡和富钨钼矿化区。与Sn，W和Mo矿物，贱金属硫化物有关的几种萤石类型，或者是硫化物或氧化物的贫瘠类型。与Sn和W结合的萤石具有复杂的阴极发光（CL）模式，表明在不同性质的流体之间存在间歇性流体渗透和相互作用。其他萤石类型具有更简单的CL模式，表明流体环境不太复杂。激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）结果表明，与W-Mo关联的萤石比与Sn矿化关联的萤石具有更高的W / Sn比。与Sn，W和Mo矿化有关的萤石的稀土元素（REE）含量高于其他萤石类型。这些痕量元素数据可以区分矿化和贫瘠的组合，并表明金属end赋反映了流体化学性质。所有萤石类型均具有扁平的球粒陨石归一化REE模式，没有明显的四分体模式，且负Eu异常，与相关的芒特普莱森特花岗岩的模式相似，表明萤石组成反映了岩浆流体的组成。贫萤石的低REE含量表明在萤石沉积的后期岩浆液和陨石液混合。与锡石结合的萤石包含主要的，共存的，稀的，液态蒸气和盐水的液态蒸气-固态流体包裹体，以及对比盐度和均质温度（分别为425°C），表明在锡石沉淀之前不混溶的液体共存；温度差异被认为是由包埋后拉伸引起的。低盐度，低温至中温流体沉淀出锡石。拉曼光谱，带能谱仪的扫描电子显微镜（SEM-EDS）和带SEM-EDS的聚焦离子束（FIB）表明，LVS夹杂物中的固体包括盐岩，六水铝石或菱铁矿，粉铁矿和赤铁矿，以及含Pb，Zn，K和Sn的氯化物。 FIB-SEM-EDS分析表明，盐岩可能会被错误地识别，从而导致错误的盐度计算。 LA-ICP-MS和FIB数据表明，萤石中的流体包裹体含有丰富的Na，K，Fe，Mn和Zn，但Pb，Sn和W较少。将NaCl-H2O相平衡应用于这种复杂流体盐分夹杂物的盐度估算不准确。

著录项

  • 作者

    Elmi Assadzadeh, Golpira.;

  • 作者单位

    University of Windsor (Canada).;

  • 授予单位 University of Windsor (Canada).;
  • 学科 Geochemistry.;Geology.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 233 p.
  • 总页数 233
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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