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首页> 外文期刊>Geochemistry: exploration, environment, analysis >Metal migration at the DeGrussa Cu-Au sulphide deposit, Western Australia: Soil, vegetation and groundwater studies
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Metal migration at the DeGrussa Cu-Au sulphide deposit, Western Australia: Soil, vegetation and groundwater studies

机译：在澳大利亚西部肺病的金属迁移：土壤，植被和地下水研究

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摘要

Transported overburden is a persistent problem for mineral exploration in Australia and elsewhere, with explorers not confident in the current understanding of where, when and how geochemical anomalies form (or don't form) in surficial materials and how to make the critical interpretive link to buried deposits. The recent discovery of the high-grade VHMS Cu-Au DeGrussa deposit on the margins of the Yilgarn Craton in the Bryah Basin of Western Australia highlights the value of effective exploration in these covered terrains. We investigated this deposit to understand the near surface geochemical signature from weathering and groundwater dispersion. Multiple sample media (soil, regolith, groundwater and vegetation) and analytical methods were used to examine metal migration. The DeGrussa (Cu-Au) ore body was successfully identified using organic soil, vegetation and groundwater with multi-element anomalies associated with the buried ore. Primarily, the anomalies are caused by weathering and vertical dispersion through thin (2 - 10 m) transported cover and vegetation cycling of Au and Cu located a few metres below the surface. Aqua regia extractions of soils and vegetation, and MMI-M extraction of soils were effective by providing strong, coherent multi-element anomalies at relatively close spacing (50 m). Conversely, portable XRF analysis was less effective at this site as the elemental concentrations were too low. Gold, As and Cu in groundwater were present in anomalous concentrations, but inconsistently so at larger sample spacing (100 s of metres). When compared to regional hydrogeochemistry (e.g. 1000 m spacing), Au, As, Cu, Pd and Pt element concentrations in the DeGrussa groundwater were elevated in a broad, general area along strike potentially identifying additional targets. Weathering, hydraulic lift by vegetation and hydromorphic dispersion are the mechanisms responsible for metal migration at the DeGrussa site.
机译：运输过度覆盖是澳大利亚和其他地方的矿物勘探持续存在的问题，探险家在目前对地球化学异常形式（或不形成）表格材料以及如何使批判性解释链接的理解埋藏存款。最近发现高档VHMS Cu-Au Deptussa沉积在澳大利亚西澳大利亚布莱赫盆地的伊尔加尔纳博物馆的边缘沉积物凸显了这些所涵盖地形的有效探索的价值。我们调查了这押金，了解从风化和地下水分散的近曲面地球化学签名。使用多个样品培养基（土壤，石油，地下水和植被）和分析方法来检查金属迁移。使用与埋地矿石相关的多元素异常成功鉴定了曙光（Cu-Au）矿体体。主要是，异常是由通过薄（2-10μm）的风化和垂直分散引起的AU和Cu的植被循环引起的，位于表面下方的几米。通过在相对较好的间隔（50μm）处提供强大的相干多元素异常（50米），土壤和植被的Aqua Regia促进土壤和植被和MMI-M萃取的方法是有效的。相反，随着元素浓度太低，便携式XRF分析在该网站上效果较低。地下水中的黄金以异常浓度存在，但在较大的样本间隔（100米）处不一致。与地区水文造物（例如，间距），Au，As，As，Cu，Pd和Pt元素浓度在较宽，一般的区域中升高，延伸可能识别额外的靶标。风化，植被和湿状分散的液压升降机是负责在Degrassa部位的金属迁移的机制。

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