The North Fault is where veins containing crystals are located and where our proposed precipitation sequence was confirmed using SEM/EDS analyses.
Sequence:
1) Botryoidal Fe-oxide
2) Mixture of Fe, Mn, Ba, and Si
3) Ba rich Mn-oxide
4) Ba Mn-oxide
5) Pure Mn-oxide
Below you will find slideshows showing petrographic images, SEM images, and He data acquired from samples from this location along with descriptions.
Sequence:
1) Botryoidal Fe-oxide
2) Mixture of Fe, Mn, Ba, and Si
3) Ba rich Mn-oxide
4) Ba Mn-oxide
5) Pure Mn-oxide
Below you will find slideshows showing petrographic images, SEM images, and He data acquired from samples from this location along with descriptions.
Petrography
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Petrographic images were taken using Leica MZ16 stereo zoom microscopes.
SemSEM images were taken using a Hitachi 3400N SEM from the Arizona Laserchron Center. Scale bars not included in images.
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He DataPreliminary data from samples 14VGCP10 and 13PRCP8. Ages for Fe-oxides tend to be older than those of Mn-oxides which would indicate they precipitated first (if the ages represent formation ages) but Mn-oxides have more scatter in their ages.
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