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Matijevic Hill first survey, Sol 3057 - 3152
Stu
post Aug 31 2012, 09:19 AM
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Oooooh, you're pretty...

Attached Image


Might be here a while, you think?

Edit: better colours on this amended version, I think... http://twitpic.com/apn9s1/full


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xflare
post Sep 8 2012, 02:54 PM
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Does anyone know of a cross section of a tektite? This is the only image I could find online:
http://www.panoramio.com/photo/3894593

The latest MI shot shows the cross section structure a bit better http://qt.exploratorium.edu/mars/opportuni...M5P2935M2M3.JPG

They do bear a superficial similarity to the very last image on this page http://www.meteorite-times.com/Back_Links/...te_of_Month.htm
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dburt
post Sep 8 2012, 07:34 PM
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Tektites are glassy bits of impact melt that hardened in the air; their shape need not be spherical, and they are probably irrelevant to the subject of this discussion. Lapilli are gravel-sized fallen melt stones, without reference to specific shape or origin (only size), and the term alone therefore is ambiguous.

As is being discussed, there are many types of spherules and other intrinsically rounded objects, of various origins. Spherules formed by some combination of chemical and physical accretion, such as concretions (formed by pure chemical accretion owing to abrupt changes in chemical properties of groundwater that reduce mineral solubility) and accretionary lapilli (formed by a combination of condensation and physical accretion - possibly involving electrostatic charge - of particles in a turbulent, cooling and mixing gas cloud, and thus not unlike hailstones in concept) are NOT HOLLOW on the inside, unless perhaps internally weathered or altered (as most are on Earth).

The spherules under discussion, or at least many of them, ARE distinctly hollow, and some appear to have objects in their center. This feature (hollow, possibly with junk on the inside) is characteristic of spherules formed by devitrificationof a hot hydrous glass, especially of the variety called lithophysae. As microcrystallites of anhydrous silicate minerals grow radially outwards, in many cases around a central object or megacrystal that served as a nucleus, they release steam that can inflate the spherule as it grows, leading to a hollow inside (except perhaps for the remant central object). The images haven't shown any yet, but some lithophysae even develop an onion-like or layered outer structure (but with open space between the layers), as a rind of crystallites develops, then steam escapes past it, inflating the still soft hot glass, then another rind of crystallites grows, and so on.

Oppy may have been imaging impact glass cementing breccia ever since it arrived at Cape York. Martian impact glasses and melts, compared to those found elsewhere, should be especially hydrous and full of salts, both of which characteristics would favor devitrification (crystallization), so finding spherules formed by devitrification of hot glass or melt shouldn't be surprising. I repeat, this is just one suggestion among many, and need not be correct, but it appears to be the only one so far that accounts for the intrinsically hollow structure with junk inside and an apparent rind on the outside that has just been imaged here. Greater magnification revealing a concentric outer rind of microcrystallites (as mentioned by Bill Harris above), or new images revealing a separated outer onion-skin structure, both would support the hypothesis. I hope this background information helps the discussion.
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ngunn
post Sep 8 2012, 08:09 PM
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QUOTE (dburt @ Sep 8 2012, 08:34 PM) *
I hope this background information helps the discussion.


It certainly helps me make sense of it. Much appreciated.
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Posts in this topic
- Stu   Matijevic Hill first survey   Aug 31 2012, 09:19 AM
- - Stu   Oh boy...   Aug 31 2012, 09:35 AM
- - centsworth_II   Interesting how well those tilted back layers matc...   Aug 31 2012, 12:31 PM
|- - PaulM   QUOTE (centsworth_II @ Aug 31 2012, 01:31...   Sep 4 2012, 05:32 PM
|- - Bill Harris   QUOTE (PaulM @ Sep 4 2012, 11:32 AM) This...   Sep 5 2012, 01:02 AM
- - xflare   Looks like things are about to get interesting.   Aug 31 2012, 12:43 PM
- - fredk   QUOTE (Stu @ Aug 31 2012, 10:19 AM) Might...   Aug 31 2012, 02:21 PM
- - mhoward   QUOTE (Stu @ Aug 31 2012, 03:19 AM) Might...   Aug 31 2012, 02:51 PM
- - Stu   Could this be Oppy's very own "Promised L...   Sep 1 2012, 10:32 AM
- - CosmicRocker   QUOTE (centsworth_II @ Aug 31 2012, 06:31...   Sep 2 2012, 02:43 AM
- - Stu   Discuss.   Sep 2 2012, 10:31 AM
- - Stu   Where did the UMSF Swear Jar go... think we're...   Sep 2 2012, 10:50 AM
|- - ElkGroveDan   QUOTE (Stu @ Sep 2 2012, 03:50 AM) Where ...   Sep 2 2012, 02:53 PM
- - Astro0   Typical Opportunity. Some other rover gets the lim...   Sep 2 2012, 01:04 PM
- - Tesheiner   I think we'll have a closer look at those rock...   Sep 2 2012, 01:23 PM
- - CosmicRocker   I'm really curious about these mound-like feat...   Sep 3 2012, 03:45 AM
- - NickF   Sol 3061 navcam pano   Sep 3 2012, 02:28 PM
- - Stu   Everyone off the bus. I think we could be here a w...   Sep 3 2012, 03:40 PM
- - Tesheiner   Nice site. Here's the 5x1 navcam mosaic and th...   Sep 3 2012, 06:23 PM
- - marsophile   Very nice images. Are these rubble piles likely t...   Sep 3 2012, 07:45 PM
- - Explorer1   I still see those overhangs as being astonishingly...   Sep 3 2012, 08:34 PM
|- - RoverDriver   QUOTE (Explorer1 @ Sep 3 2012, 01:34 PM) ...   Sep 3 2012, 10:19 PM
|- - djellison   QUOTE (Explorer1 @ Sep 3 2012, 01:34 PM) ...   Sep 4 2012, 05:24 AM
|- - stevesliva   QUOTE (djellison @ Sep 4 2012, 12:24 AM) ...   Sep 4 2012, 05:53 AM
- - Explorer1   Yes, the sections on the left (South?) look a lot ...   Sep 3 2012, 11:03 PM
- - CosmicRocker   QUOTE (Stu @ Sep 3 2012, 09:40 AM) Everyo...   Sep 4 2012, 04:20 AM
- - dvandorn   I showed the latest image of this outcrop to my ro...   Sep 4 2012, 05:25 AM
|- - TheAnt   When I first did see these images I did indeed thi...   Sep 6 2012, 03:39 PM
- - Explorer1   Sorry, I should have been more clear in my post; I...   Sep 4 2012, 06:27 AM
- - charborob   Here's a closeup of the outcrop.   Sep 4 2012, 12:16 PM
- - Stu   I wonder how much the mission geologists are drool...   Sep 4 2012, 12:36 PM
|- - vikingmars   QUOTE (Stu @ Sep 4 2012, 02:36 PM) I wond...   Sep 4 2012, 12:50 PM
- - centsworth_II   If those are hematite blueberries studding the roc...   Sep 4 2012, 01:18 PM
- - dvandorn   I'm not yet convinced that the blueberries are...   Sep 4 2012, 01:56 PM
- - Floyd   I'm a microbiologist--so what do I know--but t...   Sep 4 2012, 04:05 PM
- - Tesheiner   Here is today's mosaic in L2 filter.   Sep 4 2012, 04:49 PM
- - nprev   Floyd, I agree with you re the berries. First thin...   Sep 4 2012, 04:55 PM
- - Don1   I'm no geologist, but I'm going with a gre...   Sep 4 2012, 07:49 PM
- - ngunn   Well I'm even less of a geologist than you obv...   Sep 4 2012, 08:51 PM
|- - serpens   QUOTE (ngunn @ Sep 4 2012, 08:51 PM) I ex...   Sep 5 2012, 05:41 AM
- - Stu   A couple more sections added...   Sep 4 2012, 10:53 PM
- - Zeke4ther   I think you have the colour balance better here St...   Sep 4 2012, 11:26 PM
- - PDP8E   Here is one of those sub mosaic images of the curr...   Sep 5 2012, 12:14 AM
- - CosmicRocker   Bill: I think the clastic unit underlying the bas...   Sep 5 2012, 03:42 AM
|- - walfy   i tried to stitch a group of these frames together...   Sep 5 2012, 04:37 AM
||- - walfy   Thick blueberry froth!   Sep 5 2012, 04:48 AM
|- - serpens   QUOTE (CosmicRocker @ Sep 5 2012, 04:42 A...   Sep 5 2012, 11:05 PM
- - charborob   Sol 3063 navcam panorama:   Sep 5 2012, 11:44 AM
- - Bill Harris   QUOTE (CR)It was discussed in a recent paper that ...   Sep 5 2012, 01:48 PM
- - Jam Butty   Interesting stuff... looks like there are some thi...   Sep 5 2012, 05:19 PM
- - Stu   Fascinating place...   Sep 5 2012, 11:15 PM
- - lyford   For some reason I am thinking of Wopmay....   Sep 5 2012, 11:49 PM
|- - ilbasso   QUOTE (lyford @ Sep 5 2012, 06:49 PM) For...   Sep 6 2012, 02:02 PM
- - Tom Tamlyn   I was looking forward to this month's Mars Exp...   Sep 6 2012, 01:23 AM
- - elakdawalla   I was wondering too, and checked this morning. It...   Sep 6 2012, 01:44 AM
- - CosmicRocker   QUOTE (serpens @ Sep 5 2012, 05:05 PM) .....   Sep 6 2012, 03:53 AM
- - fredk   Well, the first MI's are down: http://qt.explo...   Sep 6 2012, 04:24 PM
|- - TheAnt   QUOTE (fredk @ Sep 6 2012, 06:24 PM) They...   Sep 6 2012, 05:24 PM
|- - ngunn   QUOTE (fredk @ Sep 6 2012, 05:24 PM) They...   Sep 6 2012, 07:36 PM
- - charborob   It really looks like we have two different units h...   Sep 6 2012, 05:17 PM
- - Stu   QUOTE (fredk @ Sep 6 2012, 05:50 PM) I ca...   Sep 6 2012, 05:21 PM
- - Jam Butty   Sol 3064 L257 un-adjusted   Sep 6 2012, 05:22 PM
- - mhoward   Amazing stuff. This is the view west and 20º down....   Sep 6 2012, 05:42 PM
|- - centsworth_II   QUOTE (mhoward @ Sep 6 2012, 12:42 PM) .....   Sep 6 2012, 05:52 PM
- - Stu   A couple of MI mosaics... We really need a ...   Sep 6 2012, 06:21 PM
- - dvandorn   I believe we established quite a while ago that he...   Sep 6 2012, 07:45 PM
|- - centsworth_II   QUOTE (dvandorn @ Sep 6 2012, 03:45 PM) M...   Sep 6 2012, 08:06 PM
- - john_s   Those MIs are astonishing- so fabulous to see some...   Sep 6 2012, 08:03 PM
- - mhoward   A couple quick color anaglyphs   Sep 6 2012, 08:04 PM
- - nprev   What the heck...??!?!! (And, Stu, bril...   Sep 6 2012, 08:29 PM
- - Stu   QUOTE (nprev @ Sep 6 2012, 09:29 PM) What...   Sep 6 2012, 08:35 PM
|- - dburt   These somewhat resemble devitrification spherulite...   Sep 6 2012, 10:32 PM
- - CosmicRocker   Beautiful mosaic. These appear very different f...   Sep 6 2012, 10:10 PM
- - Explorer1   Is that a glint of sunlight on one of the nodules ...   Sep 6 2012, 11:11 PM
|- - atomoid   QUOTE (Explorer1 @ Sep 6 2012, 03:11 PM) ...   Sep 6 2012, 11:59 PM
|- - Gladstoner   .   Sep 7 2012, 09:47 AM
- - akuo   What? Another type of spherule in Meridiani? This ...   Sep 6 2012, 11:17 PM
- - Bill Harris   QUOTE (dburt)These somewhat resemble devitrificati...   Sep 7 2012, 01:48 AM
- - CosmicRocker   I'm hoping someone can post a context image sh...   Sep 7 2012, 02:50 AM
- - CosmicRocker   QUOTE (akuo @ Sep 6 2012, 06:17 PM) What?...   Sep 7 2012, 03:00 AM
- - serpens   These have a passing resemblance to the Gunflint L...   Sep 7 2012, 03:42 AM
- - elakdawalla   I was thinking the same thing. As far as I underst...   Sep 7 2012, 05:18 AM
- - belleraphon1   Know not suppossed to clutter but gotta say WOW OP...   Sep 7 2012, 11:55 AM
- - Julius   Could anyone recall the composition of Wopmay back...   Sep 7 2012, 01:55 PM
|- - Bill Harris   QUOTE (Julius @ Sep 7 2012, 07:55 AM) the...   Sep 7 2012, 02:13 PM
|- - centsworth_II   QUOTE (Julius @ Sep 7 2012, 08:55 AM) Cou...   Sep 7 2012, 02:27 PM
- - Bill Harris   QUOTE (Gladstoner)Blueberries concentrated in a li...   Sep 7 2012, 02:09 PM
|- - Gladstoner   .   Sep 8 2012, 03:08 AM
- - Don1   If this rock is Noachian aged, maybe it dates from...   Sep 7 2012, 08:29 PM
|- - ngunn   QUOTE (Don1 @ Sep 7 2012, 09:29 PM) (1) I...   Sep 7 2012, 08:58 PM
|- - centsworth_II   QUOTE (Don1 @ Sep 7 2012, 03:29 PM) ...I ...   Sep 7 2012, 09:08 PM
- - Stu   You can almost feel your boots skidding on these b...   Sep 7 2012, 10:06 PM
- - CosmicRocker   QUOTE (ngunn @ Sep 7 2012, 02:58 PM) ... ...   Sep 8 2012, 03:38 AM
|- - serpens   QUOTE (CosmicRocker @ Sep 8 2012, 03:38 A...   Sep 8 2012, 07:40 AM
|- - ngunn   QUOTE (CosmicRocker @ Sep 8 2012, 04:38 A...   Sep 8 2012, 09:23 AM
- - xflare   Does anyone know of a cross section of a tektite? ...   Sep 8 2012, 02:54 PM
|- - dburt   Tektites are glassy bits of impact melt that harde...   Sep 8 2012, 07:34 PM
|- - ngunn   QUOTE (dburt @ Sep 8 2012, 08:34 PM) I ho...   Sep 8 2012, 08:09 PM
- - Gladstoner   .   Sep 8 2012, 06:00 PM
- - serpens   After years of sulphate sandstone and a winter loo...   Sep 8 2012, 10:49 PM
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