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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, no1017, pp. 66-69 (7 ref.)

Langue / Language

Anglais

Editeur / Publisher

Canadian Institute of Mining, Metallurgy and Petroleum, Montréal, PQ, CANADA  (1974) (Revue)

Mots-clés anglais / English Keywords

pipes

;

kimberlite

;

seismic surveys

;

diamond

;

Northwest Territories

;

craters

;

diatremes

;

velocity structure

;

P-waves

;

seismic refraction

;

lithologic controls

;

granitoids

;

granodiorites

;

Archean

;

country rocks

;

plutonic rocks

;

igneous rocks

;

native elements

;

Western Canada

;

Canada

;

North America

;

Precambrian

;

Mots-clés français / French Keywords

Pipe

;

Kimberlite

;

Levé sismique

;

Diamant

;

Territoires Nord Ouest Canada

;

Cratère

;

Diatrème

;

Structure vitesse

;

Onde P

;

Sismique réfraction

;

Contrôle lithologique

;

Granitoïde

;

Granodiorite

;

Archéen

;

Roche encaissante

;

Baie Drybones

;

Roche plutonique

;

Roche ignée

;

Elément natif

;

Canada Ouest

;

Canada

;

Amérique du Nord

;

Précambrien

;

Mots-clés espagnols / Spanish Keywords

Pipa

;

Quimberlita

;

Levantamiento sísmico

;

Diamante

;

Territorios del Canadá Noroeste

;

Cráter

;

Diatrema

;

Estructura velocidad

;

Onda P

;

Método refracción sísmica

;

Control litológico

;

Granodioritis

;

Arqueano

;

Roca encajante

;

Roca granuda

;

Roca ignea

;

Elemento nativo

;

Canada Oeste

;

Canada

;

America del norte

;

Localisation / Location

INIST-CNRS, Cote INIST : 3949, 35400007511448.0030

Nº notice refdoc (ud4) : 2269136



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