Cape York - The "Lakelands", Starting sol 2703 |
Cape York - The "Lakelands", Starting sol 2703 |
Sep 10 2011, 02:02 AM
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#31
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Solar System Cartographer Group: Members Posts: 10229 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 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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Sep 10 2011, 05:23 AM
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#32
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Marvellous, guys! Starts to recall me Spirit Odyssey on Husband hill!
-------------------- I always think before posting! - Marco -
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Sep 10 2011, 12:08 PM
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#33
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Senior Member Group: Members Posts: 2872 Joined: 22-April 05 From: Ridderkerk, Netherlands Member No.: 353 |
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Sep 10 2011, 03:09 PM
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#34
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
Some comments on Chester Lake (and a false colour (?!) pancam view) here. "Paraphrased" from Squyres:
QUOTE The new target should be IDD'd... it looks bright and Noachian itself... Need to build a nice story here and relate it to the Tisdales... We think there might be a coating, so we'll have to choose a target carefully and at least APXS it... Consider RAT'ing it to get into its guts... I wonder what about it "looks Noachian"...
It is something entirely new, or SOS ("Same Old Sulfates")? This is our first major Noachian target, so let's make it count. |
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Sep 10 2011, 04:12 PM
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#35
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Junior Member Group: Members Posts: 98 Joined: 17-July 11 From: Pasadena, CA Member No.: 6066 |
Some comments on Chester Lake (and a false colour (?!) pancam view) here. "Paraphrased" from Squyres:I wonder what about it "looks Noachian"... Had me fooled, too. I asked myself that all day. The EOSs and SOWG meetings are particularly cryptic these days; these guys talk and head and shoulders above my comprehension! -m |
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Sep 10 2011, 05:50 PM
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#36
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Member Group: Members Posts: 507 Joined: 10-September 08 Member No.: 4338 |
Maybe it is the orbital images of that locality that look Noachian rather than that specific rock.
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Sep 10 2011, 06:45 PM
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#37
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
The new target is Salisbury... my home town! - I mean the one in Wiltshire, not one of the Salisburys in the colonies.
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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Sep 10 2011, 07:13 PM
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#38
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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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Sep 11 2011, 01:22 AM
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#39
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Senior Member Group: Members Posts: 1057 Joined: 17-February 09 Member No.: 4605 |
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Sep 11 2011, 09:28 AM
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#40
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Senior Member Group: Members Posts: 3009 Joined: 30-October 04 Member No.: 105 |
True that, Serpens. The geomorph of this area is more complex and convoluted than we we assume or possibly can imagine. It's like standing on a small chunk of the Canadian Shield and figuring out depositional environments with a handlens and a Brunton.
Ah, the comparative simplicity of seven years on the playa may have spoilt us... --Bill (almost giddy with anticipation over impending MI's and APXS) -------------------- |
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Sep 11 2011, 03:37 PM
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#41
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Member Group: Members Posts: 267 Joined: 5-February 06 Member No.: 675 |
Could some of you tell a non-geologist what kinds of questions the new detail we're encountering might answer. What more will we learn about the history of Mars -- besides the overly mentioned issue of water.
Steve M |
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Sep 11 2011, 06:11 PM
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#42
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
We don't know all the details, but it seems the sulfate and blueberry rocks of the plains we've just left were formed in a relatively brief period in the middle of Martian history. Water was there, and probably very salty and foul-tasting water! - not very pleasant for life. These rocks at Cape York are much older, and may have formed in very different conditions. What we hope to learn is, what were those conditions? Warm or cold? Reducing or oxidizing conditions? Acidic or alkaline? Lots of water or only a bit? Water in the ground, or melting out of overlying snow? So we would expect evidence of water, but it's the environmental conditions that are most important.
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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Sep 11 2011, 08:57 PM
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#43
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Senior Member Group: Members Posts: 3009 Joined: 30-October 04 Member No.: 105 |
That is it, exactly. When a rock like basalt weathers, in the presence of water, it breaks down into clay minerals (the phyllosilicates in the news) and various anions and cations ("minerals" dissolved in the water). The type of clays, and other weathering byproducts, is dependent on the ionic makeup of the water to begin with, as well as the temperature and whether the environment was oxidizing or reducing. By looking at the weathered zone on the hill, we can tell what the conditions were way back then.
--Bill -------------------- |
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Sep 11 2011, 09:29 PM
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#44
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Thanks Bill and Phil, that's a really clear, really useful explanation of the significance of this place. Much appreciated.
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Sep 11 2011, 10:00 PM
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#45
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
There is the complication of deciding whether any clays that may be found were formed by weathering of the basalts before the impact or after brecciation and deposition on the crater rim. It's not an easy puzzle.
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