[meteorite-list] Question Martian in 3-D: Block Island Meteorite on Mars

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Mon, 10 Aug 2009 14:37:24 -0400
Message-ID: <e51421550908101137r799ae774q21ed5ed2ad4ea46e_at_mail.gmail.com>

Hi Bernd, Randy and List -

Bernd said - "I certainly agree! These 'holes' look like the ones we know
from the Willamette iron, ...those "bowl-shaped cavities"

BINGO! I thought the same exact thing when I saw it. :)

Best regards and clear skies,

MikeG

PS - although there is another Martian meteorite (iron) that is
clearly covered in regmaglypts, or perhaps ventifact-type scoops from
wind blasting.


On 10 Aug 2009 18:18:18 UT, bernd.pauli at paulinet.de
<bernd.pauli at paulinet.de> wrote:
> Randy writes:
>
> "Most of the 'holes' don't look so much like regmaglypts
> to me. Maybe some are chemical weathering features ...
>
> http://www.nasa.gov/mission_pages/mer/images/mer20090806.html
>
> Hello Randy and List,
>
> I certainly agree! These 'holes' look like the ones we know
> from the Willamette iron, ...those "bowl-shaped cavities" *
>
> * BUCHWALD V.F. (1975) Handbook of Iron Meteorites, Volume 3, pp. 1318,
> excerpts:
>
> "It can, therefore, be assumed that, when Willamette landed in the distant
> past, it had a shape
> and sculpture very similar to that of Morito. It must have been deeply
> furrowed on the cone side
> with radiating flutings, while the antiapex was a flat, somewhat crowning
> surface with shallow
> - but large - depressions. The meteorite must have been significantly more
> massive then, possibly
> weighing more than 20 tons.
>
> This leaves us with a mass which by some mysterious process has lost more
> than six tons
> since it fell. For this to occur it appears that we have to resort to
> terrestrial weathering
> processes, as already suggested by Ward (1904c) ... It appears, however,
> that given
> sufficient time and the right conditions of dilute, aerated sulfuric acid
> from decomposing
> troilite, the cavities may reach the surprising scale observed on
> Willamette."
>
>
> Best wishes,
>
> Bernd
>
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Received on Mon 10 Aug 2009 02:37:24 PM PDT