Semiautomated geologic mapping using self-organizing maps and airborne geophysics in the Brazilian Amazon
Semiautomated geologic mapping using self-organizing maps and airborne geophysics in the Brazilian Amazon
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DOI：
10.1190/geo2011-0302.1
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发表时间：
2012-06
期刊：
影响因子：
3.3
通讯作者：
C. C. Carneiro-C.;S. Fraser;A. Crósta;A. Silva;C. Barros
中科院分区：
文献类型：
--
作者：
C. C. Carneiro-C.;S. Fraser;A. Crósta;A. Silva;C. Barros
摘要自组织映射（SOM）方法已被用来提供一个综合的空间分析和分类的航空地球物理数据收集在巴西亚马逊河流域。利用磁力和伽马射线光谱数据提取与岩石类型空间分布有关的地球物理特征，并绘制Anapu-Tuere远景区的地质图。特别强调了区分和确定岩石类型，以及已知发生在阿纳普-图埃雷地区的与金矿化有关的过程。SOM能够识别和绘制与已发布的地质图上确定的各种地质单元相关的独特地球物理特征。此外，SOM还能够识别和增强由磁力和伽马射线光谱数据联合得出的非常微妙的特征，这些特征可能与该地区存在的地质过程有关。这些结果表明，使用SOM作为地球物理数据分析的工具的有效性。
ABSTRACTA self-organizing map (SOM) approach has been used to provide an integrated spatial analysis and classification of airborne geophysical data collected over the Brazilian Amazon. Magnetic and gamma ray spectrometric data were used to extract geophysical signatures related to the spatial distribution of rock types and to produce a geologic map over the prospective Anapu-Tuere region. Particular emphasis was given to discriminating and identifying rock types, and the processes related to gold mineralization, which are known to occur in the Anapu-Tuere region. SOM was able to identify and map distinctive geophysical signatures related to the various geologic units identified on the published geologic map. Furthermore, SOM was able to identify and enhance very subtle signatures derived jointly from the magnetic and gamma ray spectrometric data that could be related to geologic processes present in the area. These results demonstrate the effectiveness of using SOM as a tool for geophysical data analysis...