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 18 2015, 07:41 PM
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#31
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Member Group: Members Posts: 813 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
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Mar 18 2015, 10:05 PM
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#32
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Member Group: Members Posts: 153 Joined: 8-February 04 From: Phoenix, AZ USA Member No.: 9 |
The shape, orientation, and geometry of these fractures reminds me of terrestrial examples of seal failures due to hydrofracturing via overpressure. This is also supported by the observations that they occur in a rather thick massive to laminated mudstone interval and terminate in the overlying more permeable coarser-grained strata.
For the interested, this a nice accessible review article on the subject: Effects of mechanical layering on hydrofracture emplacement and fluid transport in reservoirs For those less curious, here is a link to a nice photo from the article of the phenomena: Hydrofractured Mercia Mudstone For those in the UK, the classic exposures at Kilve and Watchet in Somerset are worth a pilgrimage to see these phenomena in incredible beach cliff and wave-cut terrace exposures. Check a tide chart, if you do though! -------------------- Tim Demko
BioLink site |
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Mar 19 2015, 08:44 PM
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#33
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Senior Member Group: Members Posts: 2837 Joined: 22-April 05 From: Ridderkerk, Netherlands Member No.: 353 |
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Mar 19 2015, 09:00 PM
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#34
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Senior Member Group: Members Posts: 2837 Joined: 22-April 05 From: Ridderkerk, Netherlands Member No.: 353 |
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Mar 20 2015, 10:10 AM
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#35
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Senior Member Group: Members Posts: 2837 Joined: 22-April 05 From: Ridderkerk, Netherlands Member No.: 353 |
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Mar 20 2015, 02:26 PM
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#36
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Member Group: Members Posts: 204 Joined: 14-April 06 From: Seattle, WA Member No.: 745 |
What a beautiful rock!!!
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Mar 20 2015, 02:50 PM
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#37
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Solar System Cartographer Group: Members Posts: 10184 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Mar 20 2015, 08:54 PM
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#38
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Member Group: Members Posts: 146 Joined: 22-November 14 From: Bormida (SV) - Italy Member No.: 7348 |
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Mar 20 2015, 10:37 PM
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#39
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Senior Member Group: Members Posts: 1045 Joined: 17-February 09 Member No.: 4605 |
Outstanding work Elizabeth.
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Mar 21 2015, 10:24 AM
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#40
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Senior Member Group: Members Posts: 2430 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 |
The Garden City mineral veins, rotated and shown in context
Links :- Large 1024 (1024 x 423) Large 1600 (1600 x 661) Large 2048 (2048 x 846) Original (6985 x 2887) Edit: Apologies, posted to wrong section, can mods please relocate the post? |
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Mar 21 2015, 04:21 PM
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#41
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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, 08:10 PM
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#42
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Member Group: Members Posts: 813 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
My take on MAHLI close-up on those mineral veins. Images are corrected from artifact and color corrected:
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Mar 21 2015, 09:55 PM
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#43
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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
BioLink site |
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Mar 22 2015, 12:59 AM
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#44
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
That sounds plausible. Thanks a lot for helping over this hurdle!
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Mar 22 2015, 12:54 PM
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#45
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Member Group: Members Posts: 913 Joined: 4-September 06 From: Boston Member No.: 1102 |
Mars is full of serendipity. You spend 6 months throughly exploring and studying a scientifically important area (Pahrump Hills), then hit the road and travel less than 100m before finding Garden City.
To explore Mars with less chance of driving by unseen treasures (just 100m away behind a hill or in the next canyon over), it would be nice to have a swarm or rovers or a rover with a drone scout -------------------- |
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