Titre du document / Document title
A seismic signature of the Drybones Bay kimberlite pipe, N.W.T.
Auteur(s) / Author(s)
POWER M. A. (1) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Amerok Geosciences Ltd., Whitehorse, Yukon Territory, CANADA
Résumé / Abstract
The diamondiferous Drybones Bay kimberlite pipe is the largest pipe (900 m by 400 m) discovered to date in the Northwest Territories. The pipe intrudes granodiorite of the Archean age Defeat Pluton and contains crater, reworked crater (epiclastic) and diatreme facies kimberlite. In-situ measurements of seismic p-wave velocity were recorded with in-line refraction arrays over representative areas. Refractions from fresh kimberlite were recorded over epiclastic facies kimberlite in the eastern portion of the pipe and returned an average velocity of 4300 m/s. Refractions from weathered kimberlite were recorded on all lines and returned velocities ranging from 1900 m/s to 2200 m/s. Granite surrounding the pipe returned an average velocity of 5400 m/s. The results indicate that there is a definite contrast in seismic velocities between kimberlite and country rocks at Drybones Bay and suggest that seismic refraction surveys may be an effective means of screening kimberlite targets in glaciated areas underlain by igneous or metamorphic rocks.
Revue / Journal Title
CIM bulletin
ISSN
0317-0926
CODEN CIBUBA
Source / Source
1998, vol. 91, n
o1017, pp. 66-69 (7 ref.)
Langue / Language
Anglais
Editeur / Publisher
Canadian Institute of Mining, Metallurgy and Petroleum, Montréal, PQ, CANADA
(1974)
(Revue)
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Localisation / Location
INIST-CNRS, Cote INIST : 3949, 35400007511448.0030
Nº notice refdoc (ud4) : 2269136
