GEOSCAN, résultats de la recherche


TitreMapping the mantle lithopshere for diamond potential
AuteurSnyder, D B; Bostock, M G; Lockhart, G D
Source8th International Kimberlite Conference: extended abstract; 2003, 4 pages
LiensThe POLARIS Consortium
Séries alt.Secteur des sciences de la Terre, Contribution externe 20060713
RéunionEighth International Kimberlite Conference; Victoria, British Columbia; CA; juin 22-27th, 2003
Référence reliéeCette publication est reliée Snyder, D B; Snyder, D B; Snyder, D B; Snyder, D B; Snyder, D B; Rondenay, S; Rondenay, S; Rondenay, S; Rondenay, S; Rondenay, S; Bostock, M G; Bostock, M G; Bostock, M G; Bostock, M G; Bostock, M G; Lockhart, G D; Lockhart, G D; Lockhart, G D; Lockhart, G D; Lockhart, G D; (2004). Mapping the mantle lithopshere for diamond potential using teleseismic methods , Selected papers from the Eighth International Kimberlite Conference, volume 2, the J. Barry Hawthorne volume, Lithos vol. 77 no. 1-4
ProvinceTerritoires du Nord-Ouest
SNRC75E; 75I; 75J; 75K; 75L; 75M; 75N; 75O; 75P; 76; 77A; 77B; 85F; 85G; 85H; 85I; 85J; 85K; 85N; 85O; 85P; 86A; 86B; 86C; 86F; 86G; 86H; 86I; 86J; 86K; 86N; 86O; 86P
Lat/Long OENS-117.0000 -105.0000 69.0000 61.0000
Sujetsdiamant; gisements minéraux; kimberlites; dépôts de till; tills; interprétation aéromagnétique; levés aéromagnétiques; analyses de carottes de sondage; sondage; trous de forage; exploration; prospection minière; champ magnétotellurique; interprétations magnétotelluriques; levés magnétotelluriques; xénolites; géologie économique; géochimie; pétrologie ignée et métamorphique; géophysique; sédimentologie
Illustrationsschematic cross-sections; profiles
Résumé(disponible en anglais seulement)
Diamond deposits are typically identified in four stages: (1) regional targeting in which a region's potential is assessed, often by grid till sampling for indicator minerals or global seismology; (2) kimberlite detection in which till sampling and high resolution aeromagnetic surveys locate individual deposits; (3) deposit delineation in which drill hole core sampling determines a specific deposit's volume and lithology; and (4) evaluation in which bulk sampling establishes a deposit's worth and its feasibility to be mined. Results from the past few decades indicate that globally, for every 1000 candidate magnetic anomalies identified, 100 are kimberlites, ten contain gem-quality diamonds and one is economic to mine in Canada's North. The diamond exploration industry needs discriminating tools to reduce risks at all of these stages. Seismic techniques can provide 3-D maps of key physical properties in the mantle to 700 km depth to help accomplish stage 1 (Nolet et al., 1994; Bostock, 1999). These results can then be used in conjunction with conductivity maps derived from magneto-telluric soundings and 'ground truth' of actual rock types provided by rare xenolith samples from kimberlites. At present our efforts are concentrated in the central Slave craton of the NWT, Canada, because of the strong geological, geophysical and logistical base currently available. Once a velocity/property model is established in the Slave craton, this innovative, 1st-order exploration tool can be applied throughout Canada and globally.