|Titre||Indicator minerals and the Internet: exploring Canada's North Online|
|Auteur||Spirito, W A; Adcock, S W; Campbell, H E; Chorlton, L B; Paulen, R C; McClenaghan, M B|
|Source||GeoHydro Actes de conférence 2011, Doc-2300, 2011 p. 1|
|Séries alt.||Secteur des sciences de la Terre, Contribution externe 20110093|
|Réunion||Geohydro 2011; Quebec City, QC; CA; août 28-31, 2011|
|Document||publication en série|
|Sujets||éléments d'indice; kimberlites; pétrologie ignée et métamorphique|
|Programme||Bases de données couvrant les trois territoires (minéraux indicateurs), GEM : La géocartographie de l'énergie et des minéraux|
|Résumé||(disponible en anglais seulement)|
The Geological Survey of Canada (GSC) has large amounts of regional surficial geochemical data, which are currently being augmented with indicator mineral (IM)
data from bulk sediment surface samples (including stream and glacial sediments). These data will assist mineral exploration in northern Canada as part of the GSC's Geomapping for Energy and Minerals (GEM) program. Analytical metadata and raw data
from regional surficial mapping and indicator mineral sampling programs are being entered into the Canadian Database of Geochemical Surveys (CDoGS). The focus is on three activities: 1) ensuring the data meet international metadata standards; 2)
making the data available for download in a standardized spreadsheet format; and, 3) simple visualization of the data, using Internet Earth browsers.
All of the different characteristics of the indicator mineral data are being stored in the
database, including KIM (Kimberlite Indicator Minerals), MMSIM® (Magmatic or Metamorphosed Massive Sulphide Indicator Minerals) and visible gold grain counts, grain sizes, sample weights and sample collection protocols. Electron microprobe analyses
of individual IM grains are also being stored.
The standardized data and metadata for their associated surveys can be viewed and queried via the CDoGS web portal at http://gdr.nrcan.gc.ca/geochem. From there, the results of GSC indicator mineral
surveys in Nunavut and Northwest Territories can be displayed in free, XML-based Earth browser software such as Google Earth™, which makes it easy to visualize and compare different datasets without using sophisticated GIS software. Visualizing the
data in a geographic format allows interpretation based on distribution patterns of indicator minerals (single or multi-mineral associations), when geology and ice-flow directions are considered.
To visualize the data, basemap imagery must be
downloaded from, for example, Google's map servers, and the overlay data from the CDoGS server. The size of the basemap imagery is considerably larger than the overlay data. Downloading the large base map imagery is not an issue for office-based
operations. However, visualizing data in the field can be limited by the internet connection through a satellite link with a slow connection speed. As satellite technologies steadily improve, remote field access to online data will become