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TitreClassification of distinct eruptive phases of the diamondiferous Star Kimberlite, Saskatchewan, Canada based on statistical treatment of whole-rock geochemical analyses
AuteurGrunsky, E C; Kjarsgaard, B A
SourceApplied Geochemistry 2008, 38 pages, https://doi.org/10.1016/j.apgeochem.2008.04.027
Année2008
Séries alt.Secteur des sciences de la Terre, Contribution externe 20080330
ÉditeurElsevier
Lang.anglais
DOIhttps://doi.org/10.1016/j.apgeochem.2008.04.027
Mediaen ligne; numérique
Formatspdf
ProvinceSaskatchewan
SNRC73H/07
Lat/Long OENS-105.0000 -104.5000 53.5000 53.2500
Sujetskimberlites; diamant; géochimie des roches totales; géochimie des éléments en trace; analyses des éléments majeurs; méthodes analytiques; Champ de Fort à la Corne; Kimberlite de Star ; Kimberlite de Joli Fou ; géochimie; Paléozoïque
Illustrationssketch maps; geochemical plots
Résumé(disponible en anglais seulement)
Discrete eruptive events of the Star kimberlite, Saskatchewan, Canada have been classified into 5 distinctive clusters using statistical methods applied to whole rock geochemical data. The data set consists of 270 kimberlite samples from 38 drill holes that were analysed for whole rock major- and trace-element geochemistry. The data set was analysed by multivariate statistical techniques after a log-ratio transformation, including principal component analysis, cluster analysis and linear discriminant analysis. Data analysis using principal component and k-means clustering methods recognized 5 distinct classes, confirmed by petrographic study, which correspond to unique mineralogical compositions. Based on relationships from detailed drill core logging results, these 5 geochemical clusters or classes are the Cantuar, Pense, early Joli Fou (eJF), mid Joli Fou (mJF) and late Joli Fou (lJF) equivalent age eruptive phases of the Star kimberlite. Subsequent statistical analysis utilizing linear discriminant analysis supports the distinction between the classes. For the 4 kimberlite eruptive phases (Pense, early Joli Fou, mid Joli Fou and late Joli Fou) for which there is macrodiamond data from bulk sampling, there is an excellent correlation between the amount of lithospheric mantle contamination (as defined by the geochemistry) and the diamond grade.
GEOSCAN ID225711