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Duluth Complex Magnetite Fraction
Electron Microprobe Analyses
Peter McSwiggen McSwiggen & Associates
Electron Microprobe Analyses June 30, 2013
2
Sample: 003
McSwiggen & Associates
Sample Overview
3
Sample: 003
McSwiggen & Associates
Sample Overview
4
Sample: 003
McSwiggen & Associates
Oxide Chemistry
5
Sample: 009
McSwiggen & Associates
Sample Overview
6
Sample: 009
McSwiggen & Associates
Sample Overview
7
Sample: 009
McSwiggen & Associates
Oxide Chemistry
8
Sample: 011
McSwiggen & Associates
Sample Overview
9
Sample: 011
McSwiggen & Associates
Sample Overview
10
Sample: 011
McSwiggen & Associates
Oxide Chemistry
11
Sample: 026
McSwiggen & Associates
Sample Overview
12
Sample: 026
McSwiggen & Associates
Sample Overview
13
Sample: 026
McSwiggen & Associates
Oxide Chemistry
14
Sample: 039
McSwiggen & Associates
Sample Overview
15
Sample: 039
McSwiggen & Associates
Sample Overview
16
Sample: 039
McSwiggen & Associates
Oxide Chemistry
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Sample: 066
McSwiggen & Associates
Sample Overview
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Sample: 066
McSwiggen & Associates
Sample Overview
19
Sample: 066
McSwiggen & Associates
Oxide Chemistry
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Sample: 088
McSwiggen & Associates
Sample Overview
21
Sample: 088
McSwiggen & Associates
Sample Overview
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Sample: 088
McSwiggen & Associates
Oxide Chemistry
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Sample: 092
McSwiggen & Associates
Sample Overview
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Sample: 092
McSwiggen & Associates
Sample Overview
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Sample: 092
McSwiggen & Associates
Oxide Chemistry
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Sample: 099
McSwiggen & Associates
Sample Overview
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Sample: 099
McSwiggen & Associates
Sample Overview
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Sample: 099
McSwiggen & Associates
Oxide Chemistry
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Sample: 103
McSwiggen & Associates
Sample Overview
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Sample: 103
McSwiggen & Associates
Sample Overview
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Sample: 103
McSwiggen & Associates
Oxide Chemistry
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Internal Textures
McSwiggen & Associates
Symplectite: titanomagnetite in olivine Sample 026
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Internal Textures
McSwiggen & Associates
Weathered exsolution magnetite/ilmenite Sample 066
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Internal Textures
McSwiggen & Associates
Weathered exsolution magnetite/ilmenite Sample 066
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Internal Textures
McSwiggen & Associates
Weathered exsolution magnetite/ilmenite Sample 066
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Internal Textures
McSwiggen & Associates
Sample 066 Fe oxide ovoid
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Internal Textures
McSwiggen & Associates
Sample 066 Rutile rim on titanomagnetite
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Internal Textures
McSwiggen & Associates
Weathering: Fe oxide-hydroxide surrounding magnetite
Sample 066
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Internal Textures
McSwiggen & Associates
Symplectite: titanomagnetite in olivine Sample 092
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Internal Textures
McSwiggen & Associates
Weathering rinds Sample 092
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Notes
McSwiggen & Associates
Backscattered electron imaging of the samples showed that the grains were extremely complicated with both intergrown minerals and later weathering. It was determined that rim versus core analyses would not provide any useful information. No primary mineral zoning was observed in the backscattered electron images. Each sample was extensively search for PGM grains. None were found.