Finishing work in and around Seitah, sols 238-378 |
Finishing work in and around Seitah, sols 238-378 |
Nov 6 2021, 09:43 PM
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#31
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Senior Member Group: Members Posts: 2431 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 |
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Nov 8 2021, 02:50 PM
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#32
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Senior Member Group: Members Posts: 1075 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
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Nov 8 2021, 07:44 PM
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#33
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Member Group: Members Posts: 790 Joined: 9-May 21 From: Germany Member No.: 9017 |
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Nov 10 2021, 06:40 PM
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#34
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Member Group: Members Posts: 790 Joined: 9-May 21 From: Germany Member No.: 9017 |
The abraded surface in a combination of sol 257 images with SHERLOC Autofocus and Context Imager for detail and SHERLOC WATSON camera for enhanced color.
Do I see concentric zoning and lamellae in some crystals (I do not mean the visible effect of the abrading tool hammering), or are these just image artifacts or imagination ? |
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Nov 10 2021, 08:21 PM
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#35
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Senior Member Group: Members Posts: 3009 Joined: 30-October 04 Member No.: 105 |
We do see zoning as well as lamellae in these mineral grains. I'm thinking that the zonation is due to weathering in a wet and oxygenated environment. These rocks are covered with a weathering crust and this abraded area is just beneath that zone.
--Bill -------------------- |
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Nov 12 2021, 05:55 PM
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#36
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Member Group: Members Posts: 790 Joined: 9-May 21 From: Germany Member No.: 9017 |
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Nov 13 2021, 12:34 AM
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#37
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Senior Member Group: Members Posts: 3009 Joined: 30-October 04 Member No.: 105 |
Percy hasn't covered much distance since leaving the Artuby ridge. But the Micro Imager shows consistent grain size, sorting, and angularity in several images. More important than the linear surface distance is the stratigraphic interval, which covers time as well as space. We don't know the deposition rates yet, so this time interval could be years, tens, or hundreds or thousands.
--Bill -------------------- |
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Nov 13 2021, 06:37 PM
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#38
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
Since this is Mars, it could be hundreds of millions of years.
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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Nov 14 2021, 04:56 PM
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#39
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Member Group: Members Posts: 790 Joined: 9-May 21 From: Germany Member No.: 9017 |
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Nov 15 2021, 11:30 AM
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#40
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Senior Member Group: Members Posts: 2431 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 |
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Nov 15 2021, 09:42 PM
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#41
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Member Group: Members Posts: 819 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
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Nov 15 2021, 11:08 PM
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#42
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Senior Member Group: Members Posts: 2431 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 |
Sol 262 CacheCam shows the core is in at least two sections. The 2nd (later) image provides us a with a side-on view of the upper section of the core closest to the camera.
I'm assuming the upper section of the core rotated after the static probe was used at the Volume station to measure the size of the sample, and to ensure there was room to fit the seal. I'm sure geologists will enjoy this bonus side-on view of the split core and its grain structure. |
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Nov 18 2021, 11:16 AM
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#43
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Member Group: Members Posts: 790 Joined: 9-May 21 From: Germany Member No.: 9017 |
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Nov 18 2021, 03:58 PM
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#44
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Senior Member Group: Members Posts: 1089 Joined: 19-February 05 From: Close to Meudon Observatory in France Member No.: 172 |
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Nov 18 2021, 04:46 PM
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#45
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Member Group: Members Posts: 790 Joined: 9-May 21 From: Germany Member No.: 9017 |
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