Duluth Complex Magnetite...

Duluth Complex Magnetite Fraction

Electron Microprobe Analyses

Peter McSwiggen McSwiggen & Associates

Electron Microprobe Analyses June 30, 2013

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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

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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

17

Sample: 066

McSwiggen & Associates

Sample Overview

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Sample: 066

McSwiggen & Associates

Sample Overview

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Sample: 066

McSwiggen & Associates

Oxide Chemistry

20

Sample: 088

McSwiggen & Associates

Sample Overview

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Sample: 088

McSwiggen & Associates

Sample Overview

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Sample: 088

McSwiggen & Associates

Oxide Chemistry

23

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

26

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

29

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

39

Internal Textures

McSwiggen & Associates

Symplectite: titanomagnetite in olivine Sample 092

40

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.