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首页> 外文期刊>Contributions to Mineralogy and Petrology >The evolution of authigenic Zn-Pb-Fe-bearing phases in the Grieves Siding peat, western Tasmania
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The evolution of authigenic Zn-Pb-Fe-bearing phases in the Grieves Siding peat, western Tasmania

机译：塔斯马尼亚西部格里夫斯壁板泥炭中自生的含锌-铅-铁相的演变

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A thick peat profile overlying mineralized meta-sediments possesses exceptionally high base metal contents (up to 28.6 wt% Zn and up to 3.8 wt% Pb) in the form of abundant detrital and authigenic minerals. This metal-rich peat was examined using X-ray diffraction, scanning electron microscopy and Raman spectroscopy to determine the characteristics, mineral associations, phase evolution and conditions of formation of Zn-Pb-Fe-bearing minerals within the peat. Mineral assemblages consisting of sulfides, silicates, sulfates, oxides, carbonates and phosphates could be classified as follows: (1) detrital minerals supplied by the surrounding rocks (i.e., Cambrian volcanics and sediments, Ordovician carbonates) and (2) authigenic phases that are precipitated in situ, including the predominant Zn-Pb-Fe-bearing phases. Detrital minerals are characterized by weathering-related morphologies (e.g., round, smooth surfaces and angular edges and dissolution pits), whereas authigenic phases are recognized by their delicate microparticle textures (e.g., bladed, framboidal and botryoidal textures). Zinc-bearing phases are represented by non-stoichiometric phases, also containing S, C, O and Al; sphalerite, baileychlore and Fe-Zn-Pb carbonate. Authigenic Pb- and Fe-bearing phases are also present in the peat such as galena, anglesite, plumbojarosite, magnetite and pyrite. A "line of descent" of authigenic sulfides has been established, suggesting that a non-stoichiometric, possibly amorphous Zn-rich phase is a precursor to the sphalerite. Stages of pyrite formation, where massive polycrystalline pyrite is produced via disseminated and framboidal pyrite, have also been hypothesized in this study. The assemblages of authigenic minerals in the peat reflect dynamic physical and chemical conditions, including biological processes, and are not necessarily in equilibrium with each other.
机译：较厚的泥炭剖面覆盖矿化的准沉积物，具有丰富的碎屑和自生矿物形式，具有极高的贱金属含量（锌含量高达28.6 wt％，铅含量高达3.8 wt％）。使用X射线衍射，扫描电子显微镜和拉曼光谱法检查了这种富含金属的泥炭，以确定泥炭中含Zn-Pb-Fe的矿物的特性，矿物缔合，相演变和形成条件。由硫化物，硅酸盐，硫酸盐，氧化物，碳酸盐和磷酸盐组成的矿物组合可分为以下几类：（1）围岩提供的碎屑矿物（即寒武纪火山岩和沉积物，奥陶纪碳酸盐）和（2）自生相原位沉淀，包括主要的Zn-Pb-Fe轴承相。碎屑矿物的特征是与风化有关的形态（例如，圆形，光滑的表面，棱角和溶蚀坑），而自生相则通过其细腻的微粒纹理（例如锯齿状，碎片状和类晶状的质地）来识别。含锌相以非化学计量相表示，也包含S，C，O和Al。闪锌矿，贝利氯仿和Fe-Zn-Pb碳酸盐。泥炭中也存在自生的含铅和含铁相，如方铅矿，角铁矿，铅锌铁矿，磁铁矿和黄铁矿。已建立自生硫化物的“下降线”，这表明闪锌矿的前体是非化学计量的，可能是非晶态的富锌相。在这项研究中，还假设了黄铁矿形成的各个阶段，其中大量的多晶黄铁矿是通过散布的和黄铁矿的黄铁矿生产的。泥炭中自生矿物的集合反映了动态的物理和化学条件，包括生物过程，并且不一定彼此平衡。

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