[meteorite-list] Dino killer size

From: Mark <mafer_at_meteoritecentral.com>
Date: Fri, 11 Apr 2008 18:57:01 -0400
Message-ID: <001501c89c27$5ad8bbb0$01fea8c0_at_maf>

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" <sterling_k_webb at sbcglobal.net>
To: "E.P. Grondine" <epgrondine at yahoo.com>;
<meteorite-list at meteoritecentral.com>
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" <epgrondine at yahoo.com>
> To: <meteorite-list at meteoritecentral.com>
> 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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Received on Fri 11 Apr 2008 06:57:01 PM PDT