Analytical Sample Bundle Metadata

1992

Prairies project: proton microprobe analysis of chrome spinel and peridotitic gsrnet grains

Type: lab data



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Bundle Description

Indicator mineral grains were picked as part of the Prairies 1991 reconnaissance survey, the Prairies 1992 low density survey and the SE Manitoba 1992 till survey.  Those grains that were identified by electron microprobe as being chrome spinel or peridotitic garnet (G7, G9, G10, G11) were analysed by proton microprobe.

According to information presented in the 2007 annual report for the ARC National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC) (based in the Department of Earth and Planetary Sciences at Macquarie University, Sydney, Australia):

The heavy mineral concentrates of kimberlites typically contain xenocrysts of both peridotitic garnet and chromite, derived by disaggregation of the mantle wall rocks sampled by the kimberlite.  The Ni content of the garnets, and the Zn content of the chromites, can be used to measure their temperature of equilibration, and these temperatures can be translated to depth estimates for each grain, by reference to a local geotherm derived either from the garnet populations or from peridotite xenoliths.  With this information, we can draw curves showing where the kimberlite picked up its load of garnet and chromite during ascent to the surface.

Sample Classification (Analytical)

IndexSample CountSurveySample TypePrep Lab MaterialControl RefUnknown SourceDuplicates count
Ultra-low density till and soil sampling survey, Manitoba, Saskatchewan and Alberta, 1991. (more) Till Grain Mount: 0.063 – 0.250 mm No  No 
Ultra-low density till and soil sampling survey, Manitoba, Saskatchewan and Alberta, 1991. (more) Till Grain Mount: 0.25 – 2.00 mm (2) No  No 
319  Ultra-low density till and soil sampling survey, Manitoba, Saskatchewan and Alberta, 1992. (more) Till Grain Mount: 0.25 – 0.50 mm (1) No  No  148 
50  Ultra-low density till and soil sampling survey, Manitoba, Saskatchewan and Alberta, 1992. (more) Till Grain Mount: 0.50 – 2.00 mm No  No  12 
26  Till sampling survey and overburden drilling, NTS 62H, 52E, southeastern Manitoba, 1991-1992. (more) Till Grain Mount: 0.25 – 2.00 mm (2) No  No 
14  Till sampling survey and overburden drilling, NTS 62H, 52E, southeastern Manitoba, 1991-1992. (more) Sand Grain Mount: 0.25 – 2.00 mm (2) No  No 

Analytical Package Description

Laboratory: Guelph Scanning Proton Microprobe (GSPM)

Name: Univ. Guelph proton microprobe (more)

Physics Department, University of Guelph, Ontario; proton microprobe

Analytical Suites:

IndexName
1  Guelph proton microprobe

Analytical Methods:

IndexColumn NameSuite OrderMethod OrderSuite RepeatQuantityUnitsDetermination Limit
1  Cr_PIXE    Cr  ppm 1  
2  Mn_PIXE    Mn  ppm 1  
3  Fe_PIXE    Fe  ppm 1  
4  Co_PIXE    Co  ppm 1  
5  Ni_PIXE    Ni  ppm 1  
6  Cu_PIXE    Cu  ppm 1  
7  Zn_PIXE    Zn  ppm 1  
8  Ga_PIXE    Ga  ppm 1  
9  Ge_PIXE    Ge  ppm 1  
10  As_PIXE  10    As  ppm 1  
11  Se_PIXE  11    Se  ppm 1  
12  Br_PIXE  12    Br  ppm 1  
13  Rb_PIXE  13    Rb  ppm 1  
14  Sr_PIXE  14    Sr  ppm 1  
15  Y_PIXE  15    Y  ppm 1  
16  Zr_PIXE  16    Zr  ppm 1  
17  Nb_PIXE  17    Nb  ppm 1  
18  Mo_PIXE  18    Mo  ppm 1  
19  W_PIXE  19    W  ppm 1  
20  Pb_PIXE  20    Pb  ppm 1  
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