Statistical multivariate analysis of airborne geophysical data on the SE border of the Central Lapland Greenstone complex

Journal Article · Sat Nov 01 00:00:00 EST 1986 · Geophys. Prospect.; (United States)

DOI:https://doi.org/10.1111/j.1365-2478.1986.tb00516.x· OSTI ID:7079607

Lanne, E

Statistical multivariate methods for the integrated processing of airborne geophysical data were tested. The data consisted of magnetic, electromagnetic and gamma radiation measurements, to which cluster analysis, principal components analysis and discriminant analysis were applied. Also, auxiliary variables were derived from the original ones and their value was tested. Although the frequency distributions of the data do not favour statistical analysis, the practical results are acceptable. Principal component analyses show geological and technical aspects that are difficult to obtain from the original observations. In cluster analyses, the sources of measured fields control the grouping of variables. Discriminant analysis was applied to the automatic identification of rocks by geophysical data. The rocks investigated are metasediments and metavolcanics, some magnetic and others conductive. When all available geophysical data were included, correct identifications were made in more than 60% of cases. In particular, gamma ray observations were found to improve the discrimination of non-magnetic and non-conductive rocks. The geophysical similarity of rocks studied by cluster analysis depends on electrical and magnetic properties as well as on their origin; the content of radioactive elements in turn is related to the origin.

• Research Organization: Geological Survey of Finland, Box 77, 96101 Rovaniemi 10
• OSTI ID: 7079607
• Journal Information: Geophys. Prospect.; (United States), Vol. 34:7
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
AERIAL SURVEYING
MULTIVARIATE ANALYSIS
FINLAND
METAMORPHIC ROCKS
ELECTROMAGNETIC SURVEYS
MAGNETIC SURVEYS
RADIOMETRIC SURVEYS
DATA ANALYSIS
ELECTRICAL PROPERTIES
FREQUENCY DEPENDENCE
MAGNETIC PROPERTIES
ORIGIN
STATISTICS
ELECTRICAL SURVEYS
EUROPE
GEOPHYSICAL SURVEYS
MATHEMATICS
PHYSICAL PROPERTIES
ROCKS
SCANDINAVIA
SURVEYS
WESTERN EUROPE
580203* - Geophysics- Geophysical Survey Methods- (1980-1989)