Hi Sterling
Glaciologists would be the people to talk to. They do extensive varve
sampling of current and paleo-glacial lakes looking for details they like.
That would be a great place to start.
Mark Ferguson
----- Original Message -----
From: "Sterling K. Webb" <[EMAIL PROTECTED]>
To: "E.P. Grondine" <[EMAIL PROTECTED]>;
<[email protected]>
Sent: Friday, April 11, 2008 5:08 PM
Subject: Re: [meteorite-list] Dino killer size
Hi, EP, List,
I think the method will prove valuable. Tho I know
little of the chemistry of osmium, they say that, once
vaporized, it goes "with" the atmospheric moisture
and is rained out and ends up in the muck. The iridium
distribution is spotty and hard to find, but ocean (and
lake) muck is widespread.
Now that they've found the cosmic osmium where
we expect it to be, I want'em to look for osmium-188
spikes (or enrichment) in some long sedimentary cores
from geologically more recent times for evidence of
impacts we are unaware of, or only suspect.
Sterling K. Webb
-------------------------------------------------------------------
----- Original Message -----
From: "E.P. Grondine" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, April 11, 2008 11:46 AM
Subject: [meteorite-list] Dino killer size
Hi Sterling -
I would imagine a lot of the cosmic osmium would have
been "sequestered" in the impact spherules. The KT
fossil meteorite seems to have been ignored by this
group, so
How would you determine the composition of what hit?
First, take samples from around the crater. Then
working from known densities and crater size, estimate
your velocity.
That said, the idea of using osmium ratios as a way of
detecting impacts to have occurred looks valid.
E.P. Grondine
Man and Impact in the Americas
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