基于ASTER的遥感蚀变信息提取——以西藏玉龙斑岩铜矿带为例-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

基于ASTER的遥感蚀变信息提取——以西藏玉龙斑岩铜矿带为例

Extraction of alteration information based on ASTER remote sensing: A case study of the Yulong porphyry copper belt in Xizang

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DOI	10.20086/j.cnki.yskw.2024.0613
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2024, 43(6)
作者	张远飞，王艳军，王大钊，李凯旋，梁丰，冷成彪*,
作者单位	东华理工大学核资源与环境国家重点实验室, 江西南昌 330013; 东华理工大学地球科学学院, 江西南昌 330013
摘要	位于特提斯-喜马拉雅成矿带东部的西藏玉龙斑岩铜矿带,是全球瞩目的铜成矿远景区。尽管矿区的自然条件严峻,给传统的地表勘探工作带来了挑战,但其植被稀疏的特点却为遥感信息提取提供了便利。为此,本文以ASTER遥感影像为数据源,应用主成分分析法和成像光谱法提取玉龙斑岩铜矿带的蚀变矿化信息。其中,主成分分析法选用ASTER 1~4波段提取铁染蚀变异常信息,1、3、4、5波段提取碳酸盐化蚀变异常信息,1、3、4、8波段提取Mg羟基蚀变异常信息,1、3、6、7波段提取Al羟基蚀变异常信息;而成像光谱法则主要通过最小噪声分离(MNF)、纯净像元指数(PPI)、n维可视化(n-D Visualizer)和混合像元分解法(MTMF),绘制了玉龙斑岩铜矿带的蚀变矿物信息分布图。通过综合分析两种方法所得的结果,结合地层、构造等地质要素,构建了遥感找矿模型,并预测了4个成矿远景区。最后,通过与已知矿点的对比验证,确认了我们提取的矿化蚀变区域与实际矿点高度吻合,从而证明了这两种方法的有效性和可靠性。本研究不仅为玉龙斑岩铜矿带的大规模勘探提供了有力的技术支持,也为未来靶区的精确圈定奠定了坚实基础。
Abstract	The Yulong porphyry copper belt in Xizang, located in the eastern part of the Tethys-Himalaya metallogenic belt, is a globally renowned copper mineralization prospect area. Despite the challenging natural conditions in the mining area, which pose difficulties for traditional surface exploration work, the sparse vegetation facilitates the extraction of remote sensing information. In this study, we used ASTER remote sensing imagery as the data source and applied principal component analysis (PCA) and imaging spectrometry to extract alteration and mineralization information from the Yulong porphyry copper belt. Specifically, PCA was used to extract information on iron staining alteration anomalies using ASTER bands 1～4, carbonate alteration anomalies using bands 1, 3, 4, and 5, Mg-hydroxyl alteration anomalies using bands 1, 3, 4, and 8, and Al-hydroxyl alteration anomalies using bands 1, 3, 6, and 7. Imaging spectrometry, on the other hand, involved techniques such as minimum noise fraction (MNF), pure pixel index (PPI), n-dimensional visualizer (n-D Visualizer), and mixture tuned matched filtering (MTMF) to map the distribution of alteration mineral information in the Yulong porphyry copper belt. By comprehensively analyzing the results obtained from both methods and considering geological factors such as stratum and tectonics, we constructed a remote sensing mineral exploration model and predicted four mineralization prospect areas. Finally, through comparison and verification with known mineral occurrences, we confirmed that the extracted mineralization alteration areas closely matched the actual mineral occurrences, demonstrating the effectiveness and reliability of these two methods. This study not only provides strong technical support for large-scale exploration in the Yulong porphyry copper belt but also lays a solid foundation for the precise delineation of future target areas.
关键词	ASTER；主成分分析法；成像光谱法；蚀变信息；玉龙斑岩成矿带
KeyWord	ASTER; principal component analysis; imaging spectroscopy; alternation information; Yulong porphyry copper belt
基金项目
页码	1601-1614

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张远飞，王艳军，王大钊，李凯旋，梁丰，冷成彪*. 基于ASTER的遥感蚀变信息提取——以西藏玉龙斑岩铜矿带为例 [J]. 岩石矿物学杂志. 2024; 43; (6). 1601 - 1614.

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