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Extracting Remote Sensing Anomaly Information of Alteration Based on ERDAS

Author: WangPeiZhong
Tutor: MaZhiMin；SuChunQian
School: Chang'an University
Course: Cartography and Geographic Information Systems
Keywords: Wall rock alteration ETM Alteration anomalies Metallogenic prediction
CLC: P627
Type: Master's thesis
Year: 2007
Downloads: 208
Quote: 2
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Abstract


Now, with the rapid development of China's economic construction, supply and demand of mineral resources is rising. While decreasing reserves, easy discovery outcrop ore, shallow ore dwindling. Therefore, the use of advanced technology, accurate, fast and effective way to carry out exploration and ore deposit prediction research is needed to solve the problem. In recent years, the rapid development of remote sensing prospecting techniques, the use of remote sensing alteration ETM abnormal information extraction technology to identify and direct extraction of mineralization information, and can achieve large-scale short-term quick preselection ore district, circle the major mineral base of strategic targets. But Alteration Information weak interference by many factors, the extracted information ETM mineralization alteration remote sensing anomaly there are a lot of non-mineralized anomalies are currently the main problems. This article is based on recent research ideas wall rock alteration mineral prospecting direct flag this as the focus, in the Gobi desert zone mineralization and alteration and ETM remote sensing anomaly information extraction, with detailed geological data interpretation to eliminate or weaken the non-mineralized interference exception information to explore alteration remote sensing anomaly information on regional metallogenic prediction. First, from the remote sensing technology, the basic principles of the theory and start to study the hydrothermal alteration types and altered wall rock alteration types and conditions, and the relationship between mineral species, confirming information altered rocks and metal deposits have a higher correlation. Studied the various types of altered rocks in the ETM image on the spectral characteristics of each band, summed up in the visible - near infrared spectroscopy has generated significant spectral bands are identified by the iron (Fe 2 , Fe 3 ) and hydroxyl (OH - ), water (H 2 O) or carbonate (CO 3 2 - ) and other ions or radicals generated. Alteration in the full analysis of remote sensing information extraction exception theoretical basis and on the basis of regional geological setting, through different methods of testing compared to principal component analysis summarizes the ratio method obtained the best results, and the introduction of threshold processing grading. With this method, extracted Yar Sabu Mubarak regional alteration remote sensing anomaly information and conduct field verification, and finally Mapgis6.5 system, the geology and mineral alteration remote sensing anomaly information map and chart integration, a comprehensive analysis of alteration anomalies with the formation, structure, rock, ore (dot) spatial relationships, combined with information on geology and mineral resources prediction made three prospecting targets. Use ETM image extraction alteration anomalies with fast, economical, processing area, the advantages of less human interference factors. For wide distribution area, the low level of work, areas of poor natural conditions allow rapid exploration, delineation of favorable prospects in. Alteration remote sensing anomaly information can be used as stand-alone prospecting.

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Remote sensing exploration
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