Exploring Mt Sharp north of the dunes - Part 1: Beyond Pahrump Hills, Site 45-50, Sol 923-1147, March 12-October 28, 2015 |
Exploring Mt Sharp north of the dunes - Part 1: Beyond Pahrump Hills, Site 45-50, Sol 923-1147, March 12-October 28, 2015 |
Mar 12 2015, 08:38 PM
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#1
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Finally drove away from Pahrump Hills on sol 923. Wheel tracks sure are piling up at the end of the drive -- there seems to have been quite a bit of slip.
[admin note: I was going to start a new thread for this, but realized our thread naming may be a bit out of whack because we're really not journeying to Mt Sharp anymore, are we? We'll discuss it with admins and I'll move/rename posts when we figure out our naming schema.] -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Mar 21 2015, 04:21 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Sol 930 Right Mastcam image of a dump pile, probably of the Telegraph Peak drill powder.
This simplifies arm movements, e.g. for MAHLI wheel imaging, and opens an option for a next drilling. With respect to the Garden City MAHLIs, here an annotated crop of this Sol 930 MAHLI: With an interpretation of the darker phase as partially brecciated mudrock, having lithified a little faster than the light-toned fine-grained phase, I could get a more or less consistent view of the image. Both phases look rather resistant to erosion by considering the angularity of the surface; the darker phase maybe a little more resistant than the light-toned phase. Each of the two presumed phases may vary a bit in composition. The part which doesn't like to fit easily into this interpretation are the parallel-looking features I've annotated by green lines. Initially I've been looking for cleavages to narrow down mineralogy, but instead found these linear structures, which don't seem to care too much about the remaining structuring of the rock. |
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Mar 21 2015, 09:55 PM
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#3
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Member Group: Members Posts: 153 Joined: 8-February 04 From: Phoenix, AZ USA Member No.: 9 |
The part which doesn't like to fit easily into this interpretation are the parallel-looking features I've annotated by green lines. The features that Gerald has highlighted look like healed fractures; that is, fractures that formed by a propagating crack tip but were not subsequently propped open by fluid or precipitating mineralization. They would have closed, reversing the extensional, opening mode void. The cross-cutting relationships suggest that this was an earlier fracturing episode since they terminate against the mineralized fractures (veins). The fracture faces of these features seem to have been slightly mineralized (Gerald's parallel-looking features), making them a bit more resistant to erosion and stand out in relief. -------------------- Tim Demko
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