Victor H. Garcia
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east fault

Picture
Looking towards the southeast this fault.
Samples collected from the East Fault consist mostly of what appears to be Mn-oxide cement and some samples have huge botryoidal Fe-oxide. Most of the botryoid samples that were collected come from float material because it was difficult to find good specimens in the outcrops. This fault was located using an old map used by miners prospecting for manganese in the 1940's and 1950's. There were a few other prospects on that map but due to limited time we were only able to go to one prospect. 


Below you will find a few petrographic images and SEM images acquired from samples from this location along with descriptions. Note that the oxide identification for these samples is based solely on petrographic observations and have not been confirmed using SEM/EDS analyses.

14VGCP11-13

Sample 14VGCP11 shows (from right to left) Mn-oxide cement surrounded by cement-less areas and a transition into what appears to be different phases of Fe-oxide due to composition or weathering.
Sample 14VGCP11 showing a great view of botryoidal Fe-oxide, Mn-oxide crystals, and dominantly Fe-oxide cement.
Sample 14VGCP11 showing botryoidal Fe-oxide and these amazing needle-like Mn-oxide crystals.
View of 14VGCP11 where we can see this yellow/orange gunk surrounded by Mn-oxide and Fe-oxide.
Sample 14VGCP12 showing Mn-oxide on top (silver), followed by Fe-oxide (dark red), and finally goes into mostly sandstone with a few spots of Mn-oxide (black).
Close up of the previous image showing the Mn- and Fe-oxide.
Mn- and Fe-oxide cement between the quartz grains.
Fe-oxide cement (dark red) and Mn-oxide cement (black). Sample 14VGCP12.
Sample 14VGCP13 showing what appears to be two phases of Fe-oxide.
Sample 14VGCP13 showing these blobs of Fe-oxide surround Mn-oxide (black).
More of these blobs from the previous image but we can now clearly see areas with no cement in them around the copper tape.
Mn-oxide (black) surrounded by Fe-oxide (dark red). Again we see areas with no cement between the Fe and Mn.
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