| 赵佳琪.基于高光谱数据的甘肃花西山金矿蚀变特征分析与找矿预测应用[J].地质与勘探,2023,59(1):122-133 |
| 基于高光谱数据的甘肃花西山金矿蚀变特征分析与找矿预测应用 |
| Alteration characteristics and prospecting prediction of the Huaxishan gold deposit in Gansu Province based on hyperspectral data |
| 投稿时间：2021-11-03 修订日期：2022-08-01 |
| DOI：10.12134/j.dzykt.2023.01.010 |
| 中文关键词: 高光谱遥感 蚀变分带 找矿预测 花西山金矿 甘肃 |
| 英文关键词: hyperspectral remote sensing, alteration zonation, ore prospecting prediction, Huaxishan golden deposit, Gansu |
| 基金项目:国家重点研发计划项目(编号：2019YFE0127300、2017YFC0602104)、民用航天项目（编号：
D040102）和地质调查项目（编号：DD20221642）联合资助 |
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| 中文摘要: |
| 利用地物光谱仪识别具有光谱诊断性吸收特征的蚀变矿物，并分析其空间分布及组合特征，是后续利用航空、航天高光谱遥感开展找矿预测的重要理论依据。本文以位于甘肃柳园地区花牛山矿集区的花西山金矿床为例，首先利用FieldSpecPro FR便携式光谱仪对采集样品进行光谱测量，通过The Spectral Geologist 8软件对获得的光谱数据进行分析解译，揭示了与矿化关系密切的地表蚀变矿物为绢云母（白云母和多硅白云母）+黄钾铁矾+赤铁矿+针铁矿，外围蚀变矿物主要为绢云母（钠云母）+绿帘石+绿泥石+蒙脱石+水铝石。基于这一认识，对矿区及周边开展CASI/SASI航空高光谱遥感蚀变矿物信息提取，综合地表及航空高光谱解译信息，建立了花西山式金矿床的高光谱遥感找矿预测模型，并基于该找矿预测模型在外围圈定了预测区1处，经野外查证，预测区内发现有明显金异常。研究结果表明，在分析和总结调查区成矿地质背景和蚀变特征的基础上，结合高光谱遥感信息可快速地、更有针对性地发现成矿有利区段，为矿产勘查部署提供重要参考资料。 |
| 英文摘要: |
| Using the field spectrometer to identify altered minerals with spectral diagnostic absorption characteristics, and analyzed their spatial distribution and combined feature is an important theoretical basis for the following ore prospecting prediction with airborne hyperspectral remote sensing. This paper takes Huaxishan gold deposit, which is located in the Huaniushan ore-concentrated area of Liuyuan, Gansu Province, as an example. Firstly, the field samples were measured by the fieldSpec Pro FR portable spectroradiometer. After that, these obtained data were analyzed and interpreted by The Spectral Geologist 8 software. It was revealed that the surface altered minerals closely related to mineralization were sericite (muscovite and phengite)+ jarosite+ hematite+ goethite, and the peripheral altered minerals were mainly sericite (paragonite)+ epidote+ chlorite+ montmorillonite+diaspora. Based on this understanding, CASI/SASI airborne hyperspectral remote sensing altered minerals information extracyion was carried out in mining and surrounding areas,and the surface and airborne hyperspectral interpretation information was integrated to establish a hyperspectral remote sensing ore prospecting prediction model for the Huaxishan gold deposit..Finally, based on this model, a prediction area was delineated on the periphery. After field verification, significant gold anomaly was found in this region. The result shows that on the basis of analyzed and summarized the metallogenic geological background and alteration characteristics of the survey area, combined with hyperspectral remote sensing information, it is possible to quickly and more pertinently discover favorable metallogenic sections, which provides important opportunities for mineral exploration deployment. |
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