Message 42 of 114 (28277)
01-02-2003 2:00 AM
Reply to: Message 40 by Watson
01-01-2003 11:11 PM
The glaciers move north to south
I checked a field guide on the Finger Lakes region, yes I'll agree that the glaciers were flowing N-S there.
I did an online search for the origin of the escarpment when the guide failed to discuss it and could find no reference to it being carved by glacers. Instead it seems to be an erosional remnant in a syncline.
If that were a crater there should be shock products throughout the structure, a lens of impact breccia beneath Michigan Basin, and lots of faulting in the escarpment itself.
I have had a lot of spectrographic analysis done on glass rocks found in lake erie and the boys at NASA said spectrographic
analysis is not reliable is this true?.
Could you describe these glass rocks a bit?
Who did the analysis? Also, which NASA facility was involved?
An asteroid could be a planet that has never formed
That's the current thinking. But if that's the case then most wouldn't be able to differentiate enough to form a basalt.
If there were meteorites falling that were consistent with Earth's mantle material then I would be more open to basalt asteroids.
But I've looked into this a little further and found that now some scientists are arguing that Vesta is partially covered by a basaltic rock, based on HST observations.
or a large
piece of a planet that has been distroyed
It's very unlikely that there are any asteroids formed by destroyed planets because achondrites are so rare. Most meteorites are undifferentiated. If there were meteorites with compositions like solid slabs of olivine or peridotite falling in large numbers I would be more open to the possibility.
So why couldn't basalts occur in asteroids?
Most asteroids are too small to retain enough heat and hold a graviational field significant enough to allow differentiation. I think I may need to read up on Vesta to see what researchers are claiming has happened there to facilitate production of basalt.
This is a surprising find and you'll notice that people in the following article suggested that perhaps it should be thought of as a small planet.
Next Draw a line from Brenham kansas east through lafayett Indiana
I see that that the three line up but I don't understand the significance. Brenham is a pallasite and Lafayette is an SNC. Brenham is often terribly weathered and Lafayette is fresh. And also, Lafayette was found in a Purdue collection. Nobody knows where it was found (though I wish I did!), it was brought to Lafayette by human agency from some place unknown. There has even been speculation it may be a Nakhla that was misplaced (but it has been discredited by lab work). For this linear trend to be valid we must assume that the rock was found right there in Lafayette.
But that itself doesn't necessarily say much. So many meteorites are known that I can use them to draw lines to any place I want.
Where does Atlantis fit into this?
And I still don't understand why there would be any sort of "politics" involved with this. The Sudbury impact structure is only a few hundred miles from there.
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| ||Message 40 by Watson, posted 01-01-2003 11:11 PM|| ||Watson has responded|
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