|Table of Contents|

Analyses of Alteration Mineral Mapping and Mineral Resources Prospecting Using TM or ETM Data(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2008年第03期
Page:
254-259
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Analyses of Alteration Mineral Mapping and Mineral Resources Prospecting Using TM or ETM Data
Author(s):
ZHANG Bing1; ZHOU Jun2; WANG Jun-nian1
1. Seventh Geological Brigade, Xinjiang Bureau o f Geology and Mineral Resources, Wusu 833000, Xinjiang, China; 2. School o f Earth Sciences and Resources, Changan University, Xian 710054, Shaanxi, China)
Keywords:
remote sensing;  alteration mineral mapping;  mixture pixel;  multi-information;  mineral resources prospecting
PACS:
TP79;P285.1
DOI:
-
Abstract:
Several methods exist in the alteration mineral mapping using TM or ETM data. Those mainly comprise the ratio imagery, principal component analyses or Crosta technique and the supervised classification based on known altered mineral localities and spectral angle methods. Detailed analyses and lots of applications related to this study show certain problems in the methodology. Firstly, all of them are notably hampered by certain natural factors like vegetation, topography and soil cover. Secondly, mixture pixels and the related mixture reflectance can be readily caused by smaller altered mineral targets and larger remote sensing data pixels, in addition to the common presence of some high reflectance minerals like quartz and feldspar in the altered mineral belt, which may seriously influence normal occurrence of the so-called diagnostic spectral absorption that acts as the basis of all the alteration mineral mapping methods. Lastly, certain data processing-based methods using the reflectance of relevant“pure materials”, such as the sub-pixel classifying, spectral mixture analysis and fuzzy classification, can solve the problem to some extent and even so they are confined to locating the surface altered mineral targets only. Therefore, it is important to employ multi-methods including geology, geophysical and geochemical exploration and remote sensing in mineral resources prospecting, and that will largely reduce a lopsided view resulted from a single method.

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Last Update: 2008-09-20