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MeteoritesImpact Breccia?
3rd Dec 2011 17:19 UTCJerry Montgomery
Thanks for any input.
3rd Dec 2011 17:57 UTCDon Saathoff Expert
3rd Dec 2011 20:05 UTCJerry Montgomery
http://www1.newark.ohio-state.edu/Professional/OSU/Faculty/jstjohn/Texas-Geology/Odessa-Impact-Crater2.htm.
As an amateur, I didn't read it well and assumed the one photo was Breccia. This rock actually looks like the photos of the oncolitic limestone. I attached a picture of the clast with more detail (8993). They are of the same material that the entire rock is made of. It doesn't appear to be a conglomerate. i also attached a photo with lighting from the side to show the details in the side opposite of the clasts (8992).
When I revisited the web page for the odessa impact, I realized that I have many rocks on my property that look like the breccia that they show. I have attached one labeled 8999.
3rd Dec 2011 21:17 UTCReiner Mielke Expert
3rd Dec 2011 21:59 UTCRick Dalrymple Expert
3rd Dec 2011 22:57 UTCNathalie Brandes 🌟 Manager
3rd Dec 2011 23:02 UTCMilton Dye
3rd Dec 2011 23:07 UTCNorman King 🌟 Expert
Your samples do not show any features associated with impacts. Some of your samples are rippled sediments (8992) with dessication (drying) cracks (8974;8992). Others show intraformational conglomerate (Side 1; 8993). Those are features that go together (rippled sediment, dessication cracks, intraformational conglomerate), suggesting deposition, erosion, and redeposition on a tidal flat. Sample 8999 shows metamorphosed clayey/silty sediment that might be a side view of any of the others, especially as they come from near the Appalachian Mountains with its history of metamophism. I have seen exactly that assemblage of lithologies at many sites throughout the Appalachians.
To claim evidence for an impact, your samples should have impact written all over them. No equivocation--all of us raving over them as impact artifacts rather than atributing them to normal sedimentary/metamorphic processes.
4th Dec 2011 02:27 UTCNorman King 🌟 Expert
5th Dec 2011 13:52 UTCJerry Montgomery
22nd Oct 2013 22:37 UTCOlivier L.
Show me a thin section
23rd Oct 2013 00:27 UTCAndy Lawton
23rd Oct 2013 01:21 UTCThaddeus Gutierrez
Interestingly, the feldspathic autobrecciated clast (DSC_8999.JPG (771.5 KB)) seems to show that it fractured in situ, but not necessarily suddenly, during the initiation and maintenance of ion-rich hydric alteration of its cleavage structure, differentially conducting as a dielectric under the influence of a magnetic or electrical field, which is ubiquitous and intrinsic to groundwater flow. Also, don't underestimate the power of electrical discharges propagating into the water table - the very essence of the neutralization of geologic-atmospheric electrical disequilibrium . Many relict Pleistocene landforms, such as playa bluffs, positive features in badlands, and spring-bearing perched alluvial aquifers (as found on fluvioglacial moraines) only survive due to their ability to concentrate resistant precipitates as they conduct underground discharges, creating greater negative charge during frechet distribution-constrained discharge spikes ahead of powerful thunderstorms, as well as more directly, due to surface/sub-surface zone vitrification effects. What aspect is your property? what kinds of storms do you get? Can you describe the geology in your specific area (age, composition, degree of weathering)?
23rd Oct 2013 02:30 UTCDoug Daniels
23rd Oct 2013 03:00 UTCOlivier L.
-------------------------------------------------------
> uh...say what????
I think he's saying that this is melt produced by a lightning discharge
but I really doubt it.
It really looks like old industrial or construction garbage that got dumped
there... I dug a hole in my backyard to plant a tree and I stumbled upon
a concrete mass, leftovers from houses built way before my area was
developped
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