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TitleRegional geobotany with TM: a Sudbury case study
AuthorHornsby, J K; Bruce, B
Source10th Canadian Symposium on Remote Sensing/10e Symposium canadien sur la télédétection; vol. 2, 1986 p. 601-609
Alt SeriesEarth Sciences Sector, Contribution Series 2005573
Meeting10th Canadian Symposium on Remote Sensing - 10e Symposium canadien sur la télédétection; Edmonton, Alberta; CA May 5-8, 1986
NTS41I/11; 41I/12; 41I/13; 41I/14
AreaLevack; Windy Lake
Lat/Long WENS-82.0000 -81.0000 47.0000 46.5000
Subjectseconomic geology; surficial geology/geomorphology; structural geology; general geology; remote sensing; geobotanical methods; satellite imagery; mapping techniques; computer mapping; vegetation; lithology; bedrock geology; norites; breccias; felsic rocks; intrusive rocks; metavolcanic rocks; metasedimentary rocks; tills; glaciofluvial deposits; deltaic deposits; lacustrine deposits; clays; silts; topography; structural features; modelling; mineral exploration; lineaments; Sudbury Basin; Sudbury Igneous Complex; Superior Province; Benny Belt; thematic mapper imagery; image processing systems; data integration; data analysis; classification; spectral reflectance
Illustrationssketch maps; tables; graphs
AbstractRecent results from a demonstration project with TM imagery in the Sudbury Basin have provided helpful clues in the interpretation of regional or "background" geobotanical relationships. Computer-sided image analysis using both mini and P.C-based systems has contributed to the preparation of thematic maps of vegetation, surficial geology, lithology and structures in the Levack area of the Basin.
The bedrock of the study area includes the norites and breccias of the Sudbury Igneous Complex; the felsic intrunsives of the Superior province, and the metasediments and metavolcanic of the Benny Belt. Till cover in the area is thin but highly variable creating a complex pattern of outcrop. Glaciofluvial sediments derived from the tills form structurally controlled valley fill and deltaic deposits. Lacustrine silts and clays in the low areas of the central basin complete the surficial geologic sequence.
Derivation of reliable "target" geobotanical relationships from detailed airborne spectral surveys would be understandably improbable against this complex background of topography, bedrock and surficials. This paper reports on efforts to separate and understand the effects of topography, surficials, lithology and structures on the nature and patterns of vegetation cover. Comparative examples of the influences of these factors are discussed; and a regional geobotanical model integrating image, map and field data is outlined.
It is suggested, on the strength of these results, that such background geobotanical surveys are a prerequisite step in an integrated approach to the application of geobotany to mineral exploration in Canada. Such investigations, combined with detailed airborne surveys to detect the spectral effects of mineral induced stress in vegetation, offer considerable promise in support of mineral exploration in glaciated and vegetated environments.