Matijevic Hill detailed survey, Sol 3153 - 3290 |
Matijevic Hill detailed survey, Sol 3153 - 3290 |
Dec 7 2012, 07:19 PM
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#1
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Member Group: Members Posts: 154 Joined: 19-September 12 Member No.: 6658 |
Some movement on sol 3153 to Copper Cliff:
Also visible in the Matijevic Pan. Finished watching the two videos posted above - very interesting stuff - Thanks stewjack for posting the links! |
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Dec 7 2012, 09:50 PM
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#2
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Senior Member Group: Members Posts: 1043 Joined: 17-February 09 Member No.: 4605 |
Ronald, really nice presentation thank you. The choice of 3-d methods is very much appreciated.
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Dec 10 2012, 03:34 PM
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#3
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Member Group: Members Posts: 154 Joined: 19-September 12 Member No.: 6658 |
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Dec 10 2012, 05:19 PM
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#4
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
Use this thread for all images, discussions, etc. post sol 3153.
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Dec 10 2012, 06:22 PM
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#5
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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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Dec 11 2012, 01:06 AM
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#6
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Senior Member Group: Members Posts: 2997 Joined: 30-October 04 Member No.: 105 |
RE: the "NewBerries" discovered at this zone of the column:
QUOTE Impact spherules as a record of an ancient heavy bombardment of Earth Asteroids hitting Earth typically vaporize a mass of target rock comparable to the projectile’s mass. As this vapour expands in a large plume or fireball, it cools and condenses into molten droplets called spherules. http://www.nature.com/nature/journal/v485/...ature10982.html From my review of the literature and observations of the stratigraphy at the site, I am inclined to regard the "spherules of unknown affinity" simply as impact spherules. --Bill -------------------- |
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Dec 11 2012, 06:13 PM
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#7
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Member Group: Members Posts: 384 Joined: 4-January 07 Member No.: 1555 |
"Simply as impact spherules" may not be as simple as it sounds. Impacts can form spherule-like objects by multiple processes, including, e.g., condensation of silicate vapor to a glass, which you cited, condensation of sticky steam to mineral grains forming accretionary lapilli (e.g., the larger spherules stratigraphically associated with the Chicxulub Crater assumed to have killed the dinosaurs), hollow vesicles in impact glass later filled with minerals, or spherulites associated with devitrification (rapid partial crystallization) of impact glass (which spherulites characteristically have a radiating internal structure also noted at high magnification in some of the "newberries"). Multiple types of impact spherules might be expected to be preserved on Mars, much more commonly than on Earth, whose early impact record has been completely erased or is incomplete (biased by differential settling through sea water and heavily altered by aqueous processes).
-dburt |
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Dec 11 2012, 08:25 PM
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#8
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Member Group: Members Posts: 154 Joined: 19-September 12 Member No.: 6658 |
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Dec 12 2012, 12:19 AM
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#9
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Senior Member Group: Members Posts: 1043 Joined: 17-February 09 Member No.: 4605 |
The interesting aspect on the provenance of these new-berries is their position towards the bottom of the original crater rim. This seems a most unlikely position for deposition of lapilli or condensation spherules originating with the Endeavour impactor and provides an indication that this is part of the pre-impact surface / sub surface.
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Dec 12 2012, 06:17 PM
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#10
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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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Dec 12 2012, 07:48 PM
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#11
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Member Group: Members Posts: 154 Joined: 19-September 12 Member No.: 6658 |
Some more Copper Cliff from sol 3156:
Could be a part of the Matijevic Hill Memory Game Big version here. |
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Dec 12 2012, 10:47 PM
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#12
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Member Group: Members Posts: 267 Joined: 5-February 06 Member No.: 675 |
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Dec 13 2012, 02:10 AM
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#13
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Junior Member Group: Members Posts: 52 Joined: 1-March 11 From: Houston, USA Member No.: 5860 |
Fracturing followed by fluids depositing the white mineral in the fractures. Brecciation is common with impact. We saw similar fine veins near the south end of Cape York. Here's a link to a picture of a terrestrial breccia; different scale, fracturing mechanism, and fracture fill, but the filled fracture idea is the same:
http://www.nr.gov.nl.ca/nr/mines/outreach/.../breccia1lg.jpg |
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Dec 13 2012, 02:28 AM
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#14
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Member Group: Members Posts: 399 Joined: 28-August 07 From: San Francisco Member No.: 3511 |
Does Vermilion look like a contact point between rock types that Steve Squyres alluded too in his recent AGU talk?
-------------------- 'She drove until the wheels fell off...'
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Dec 14 2012, 07:00 AM
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#15
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Senior Member Group: Members Posts: 1043 Joined: 17-February 09 Member No.: 4605 |
Really looking forward to Oppy getting stuck into the rocks here... Me too, although interpretation will be a nightmare. For instance the Copper Cliff MI pan shows glass, spherules, angular and rounded clasts, tiny veins and possibly a clast within a clast. While this is a polymictic impact product we cannot assume that the glass and spherules are cogenetic. Cape York is probably giving us an insight into the multiple impact products of the Hadean but our understanding will be through a glass darkly. |
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