Cape York - The "Lakelands", Starting sol 2703 |
Cape York - The "Lakelands", Starting sol 2703 |
Oct 5 2011, 01:51 AM
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#196
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Senior Member Group: Members Posts: 1057 Joined: 17-February 09 Member No.: 4605 |
The PS update noted that Steve Squyres mentioned that Chester Lake “"has sort of a basaltic composition. It does not have a zinc enrichment like we saw at [Tisdale 2]."
” The published APXS comparative graph for Tisdale 2 showed elevated Zn and Br but did not address Cu. I think that enhanced Br is consistent with basaltic glass but If Cu was also elevated it would possibly indicate past, hot hydrothermal activity. If not then possibly a cold seep or basaltic weathering (plagioclase?). Does anyone have any idea of the Cu level? |
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Oct 5 2011, 01:42 PM
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#197
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
QUOTE (Serpens) If not then possibly a cold seep or basaltic weathering (plagioclase?). Does anyone have any idea of the Cu level? I've not seen any of the details of the chemistry, but this will likely be a hot topic at the next LPSC. The top of Tisdale which was APXS'd is either a weathered zone and/or has a inherent different chemistry or is a bedding plane/fracture which has a zone of Zn-rich material deposited in it (cold-water hydrothermal). That "weathered" unit has a distinctive light-ochre color is evident in other exposures along Shoemaker Ridge and should be examined further on the traverse to the "summit crater". I intuitively think of this yellowish colour as generally "limonitic", which could include almost anything, actually. Remember, the original, deep crust here is from not only a warmer and wetter Mars, but a Mars with a hotter amd more mobile/active crust/mantle. The mantle of that era had more hotspots and plumes and there was extensive tectonic activity. This primeval crust (Ur-crust) has since been pounded, mixed and blended into an impact breccia by countless impacts, and it has, among other things, has a much higher surface:volume ratio than rock and can be much more reactive to chemical weathering, weathering in the presence of water. In a way, this is a glimpse at what the Earth may have been like in Hadean times, with tectonic cycles starting and bio-processes just beginning. Exciting times, then and now. --Bill corrected (strikethrough) -------------------- |
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Oct 5 2011, 02:10 PM
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#198
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Solar System Cartographer Group: Members Posts: 10228 Joined: 5-April 05 From: Canada Member No.: 227 |
Meridiani on the edge of the Tharsis uplift? That's a bit of a stretch!
Phil -------------------- ... 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 PDF: 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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Oct 5 2011, 02:26 PM
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#199
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
QUOTE a bit of a stretch best Mars uplift pun ever... -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Oct 5 2011, 02:42 PM
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#200
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
QUOTE Meridiani on the edge of the Tharsis uplift? That's a bit of a stretch! Oops, you're correct-- I was thinking of something else. --Bill -------------------- |
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Oct 5 2011, 03:03 PM
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#201
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Chief Assistant Group: Admin Posts: 1409 Joined: 5-January 05 From: Ierapetra, Greece Member No.: 136 |
-------------------- photographer, space imagery enthusiast, proud father and partner, and geek.
http://500px.com/sacred-photons & |
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Oct 5 2011, 09:39 PM
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#202
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
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