Nitrogen aggregation and cothodoluminescence characteristics of diamonds from the Point Lake kimberlite pipe, Slave Province, NWT,Canada

2019 ◽  
Keyword(s):  
Kimberlite Pipe ◽  
Slave Province ◽  
Nitrogen Aggregation

Petrology and oxygen-isotope geochemistry of the Yamba Lake kimberlite rocks, N.W.T.

2000 ◽  
Vol 37 (7) ◽  
pp. 1053-1071 ◽  
Author(s):  
Pauline Orr ◽  
Robert W Luth
Keyword(s):  
Major Element ◽  
Isotope Geochemistry ◽  
Isotopic Fractionation ◽  
Kimberlite Pipe ◽  
Spinel Lherzolite ◽  
Garnet Lherzolite ◽  
Slave Province ◽  
Low Concentrations ◽  
Subducted Oceanic Crust ◽  
Indicator Minerals

The Torrie, Sputnik, and Eddie kimberlite rocks, located near Yamba Lake, central Slave province, N.W.T., are volcaniclastic, macrocrystic, heterolithic, olivine-rich tuff, and olivine-rich tuff breccia. Torrie and Sputnik kimberlite rocks contain pyroxene and garnet xenocrysts and megacrysts with major-element compositions consistent with derivation mostly from disaggregated garnet lherzolite, with subordinate contributions from eclogite, spinel lherzolite, garnet harzburgite, and websterite. The presence of primary groundmass phlogopite and compositionally evolved spinel, and the absence of mantle xenocrysts, xenoliths, and megacrystic ilmenite distinguish the Eddie kimberlite pipe from the other two kimberlite pipes. Large variations in δ18O of garnet and clinopyroxene in xenocrysts and xenoliths (+3.98 to +6.36‰), nonequilibrium intermineral isotopic fractionation, and major-element heterogeneity are interpreted as resulting from infiltration of fluids or melts produced by dehydration or melting of subducted oceanic crust into overlying peridotite. Although the timing is unconstrained for the xenocysts, the xenolith must have experienced this metasomatic interaction shortly before entrainment in the kimberlite. Variable δ18O values for magnesian ilmenite are also interpreted to result indirectly from such metasomatic activity in the mantle as well. The Torrie and Sputnik kimberlite rocks have low concentrations of diamond indicator minerals consistent with their low-diamond grades. These kimberlite rocks did not sample a significant amount of garnet harzburgite, the rock type commonly associated with high-diamond grades in other kimberlite rocks. Furthermore, metasomatism just prior to kimberlite eruption may have caused the resorption of any diamond present.

RUTILE-DIAMOND INTERGROWTHS FROM UDACHNAYA KIMBERLITE PIPE (YAKUTIA)

2017 ◽  
Vol 39 (3) ◽  
pp. 17-31
Author(s):  
V. Kvasnytsya ◽  
◽  
O. Vyshnevskyi ◽  
Keyword(s):  
Kimberlite Pipe

Anton terrane revisited: Late Archean exhumation of a moderate-pressure granulite terrane in the western Slave Province

Geology ◽  
2000 ◽  
Vol 28 (12) ◽  
pp. 1075-1078
Author(s):  
S.J. Pehrsson ◽  
T. Chacko ◽  
M. Pilkington ◽  
M.E. Villeneuve ◽  
K. Bethune
Keyword(s):  
Moderate Pressure ◽  
Slave Province

Primary hydrocarbon inclusions in garnet of diamondiferous eclogite from the Udachanaya kimberlite pipe, Yakutia

2009 ◽  
Vol 426 (1) ◽  
pp. 695-698 ◽  
Author(s):  
A. A. Tomilenko ◽  
S. V. Kovyazin ◽  
L. N. Pokhilenko ◽  
N. V. Sobolev
Keyword(s):  
Kimberlite Pipe
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