| 吴德文,鲁佳,杨自安,张建国,张普斌.高光谱蚀变矿物与成矿元素异常耦合及定量反演研究[J].矿产勘查,2025,16(5):1220-1230 |
| 高光谱蚀变矿物与成矿元素异常耦合及定量反演研究 |
| Abnormal coupling and quantitative inversion study of hyperspectral altered minerals and ore-forming elements |
| 投稿时间：2025-04-06 |
| DOI：10.20008/j.kckc.202505026 |
| 中文关键词: 航空高光谱 蚀变矿物 岩屑(土壤)测量 成矿元素 定量反演中图分类号:TP79 P595文献标志码:A文章编号:1674-7801(2025)05-1220-11 |
| 英文关键词: aerial hyperspectral remote sensing alteration minerals rock fragments (soil) measurement ore-forming elements quantitative inversion |
| 基金项目:本文受中国地质调查局项目“东天山成矿带景峡地区地质矿产调查”(DD20160011)资助。 |
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| 中文摘要: |
| 利用高光谱数据对地表物质中元素含量进行定量反演，首先需要研究目标元素与光谱波段之间的相关性，寻求特征波段或变量组合，并建立有效的反演模型。从光谱形成机理和矿物光谱特征分析，金属成矿区(带)中成矿元素富集的光谱响应，更大程度上是由矿化过程中产生的蚀变矿物或载体矿物引起的。基于此认识，本文以东天山景峡地区为实验区，研究了该区 1∶5万岩屑(土壤)地球化学测量数据的元素异常与航空高光谱(HyMap)蚀变矿物信息异常之间的空间关系和成因联系，统计分析了主要成矿元素 Au、Cu含量与高光谱蚀变矿物丰度、原始高光谱波段及多种光谱变换波段(包括一阶微分、倒数对数和连续统去除)之间的相关性。结果表明，相较于原始光谱及其变换光谱的特征波段，与矿化有关的蚀变矿物丰度与成矿元素含量之间具有更高的相关性；进而选用相关性较高的蚀变矿物组合的丰度数据作为自变量，采用多元线性回归模型进行 Au、Cu含量反演，其模型拟合优度(R2)亦有明显提升。由此可见，高光谱蚀变矿物填图不仅可为矿产勘查提供定性的找矿空间信息，而且可作为指示成矿元素富集程度的量化指标。 |
| 英文摘要: |
| To quantitatively invert the elemental content in surface materials using hyperspectral data, it isnecessary to study the correlation between target elements and spectral bands, seek characteristic band or variablecombinations, and establish an effective inversion model. From the analysis of spectral formation mechanisms and mineral spectral characteristics, the spectral response of enrichment for ore-forming elements in metal mineraliza.tion areas (zones) is largely caused by altered minerals or carrier minerals generated during the mineralization pro.cess. Based on this understanding, this article takes the Jingxia area of the East Tianshan as the experimental areato study the spatial relationship and genetic relationship between the element anomalies of 1∶50000 rock fragments(soil) geochemical measurement data and the alteration mineral information anomalies of the aerial hyperspectraldata (HyMap)，statistics and analysis the correlation between the main ore-forming elements Au and Cu content andthe abundance of hyperspectral alteration minerals, the original hyperspectral bands, and various spectral transfor.mation bands (including first-order differentiation, reciprocal logarithm, and continum removal) in the area. The re.sults showed that compared to the characteristic bands of the original spectrum and its transformed spectrum, thereis a higher correlation between the abundance of altered minerals related to mineralization and the content of ore-forming elements. Therefore, the abundance of alteration mineral combinations with high correlation was selected asindependent variables, and a multiple linear regression model was used for Au and Cu content inversion, its modelfitting goodness (R2) was also significantly improved. This shows that hyperspectral alteration mineral mapping cannot only provide qualitative spatial information for mineral exploration, but also serve as a quantitative indicator forthe enrichment degree of ore-forming elements. |
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