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首页> 外文会议>PACRIM Congress >Mapping Hydrothermal Minerals in New Zealand Geothermal Fields Using Reflectance Spectroscopy (VNIR-SWIR) and Application to Mineral Deposit Exploration
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Mapping Hydrothermal Minerals in New Zealand Geothermal Fields Using Reflectance Spectroscopy (VNIR-SWIR) and Application to Mineral Deposit Exploration

机译：使用反射光谱（VNIR-SWIR）在新西兰地热场中映射水热矿物质，并应用于矿产存款勘探

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Key indicator hydrothermal alteration minerals formed from fluids of known fluid composition (neutral versus acid pH) and temperature have been mapped for New Zealand (NZ) geothermal fields by visible/near-infrared (VNIR) and shortwave infrared (SWIR) reflectance spectroscopy. Smectite, interstratified illite-smectite and illite formed from neutral pH fluids have zoned distributions with higher temperature illite (>220°C) in and around the upflow of chloride waters and low temperature smectite (<150°C) on the margins (eg Ohaaki, NZ). In adularia-sericite epithermal deposits, Au-Ag veins are similarly surrounded by zoned clays, with mineralised veins enclosed by illite (eg Martha, NZ) or occurring at the illite/illite-smectite boundary (eg Favona, NZ). Reflectance spectroscopy is also highly effective in identifying minerals formed from acid fluids; both steam-heated acid-sulfate waters (eg kaolinite and alunite at Rotokawa, NZ), or magmatic-hydrothermal fluids (eg pyrophyllite and topaz at Ngatamariki, NZ). These same alteration minerals commonly show zoned distributions in high sulfidation epithermal deposits (eg Rodalquilar, Spain) and in lithocaps associated with porphyry deposits (eg Lepanto, Philippines). Thus reflectance spectroscopy permits the rapid identification of key alteration minerals that can be mapped at a high sample frequency and used as vectors towards mineralisation.
机译：通过可见/近红外（VNIR）和短波红外（SWIR）反射光谱，由已知的流体组合物（中性与酸pH）和温度的流体（中性与酸pH）和温度映射到新的西兰（NZ）地热场的键指示器水热改变矿物。蒙脱石，由中性pH流体形成的硅藻土 - 蒙脱石和伊尔石具有划分的氯化物水中越高的耐温illite（> 220°C）的分布在氯化物水中的上流和下部的边缘（例如Ohaaki ，nz）。在血清岩膜沉积物中，Au-Ag静脉类似地被分区粘土包围，用illite（例如Martha，NZ）包围的矿化脉（例如Martha，NZ）或发生在伊尔掘体/硅藻土 - 蒙脱岩边界（例如Favona，NZ）。反射光谱在鉴定由酸性流体形成的矿物质方面也非常有效;蒸汽加热的酸 - 硫酸盐水（例如kaolinite和rotokawa，nz）或岩浆 - 水热流体（例如在Ngatamariki，nz的糖酸盐和黄色）。这些相同的改变矿物通常展示高硫化术术沉积物（例如罗布拉特，西班牙）和与斑岩沉积物相关的Lithocaps（例如Lepanto，菲律宾）中的分区分布。因此，反射光谱允许快速鉴定可以以高样本频率映射并用作矿化的载体。

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