[meteorite-list] RE:Hudson Bay Arc

From: Charles O'Dale <codale0806_at_meteoritecentral.com>
Date: Thu Apr 22 10:30:01 2004
Message-ID: <000b01c38678$f126df80$6e656718_at_mdguo5m3tdnvnv>

Charly V:

In my article on the Clearwater West crater I do refer to the Hudson's Bay
arc.

http://www.ottawa.rasc.ca/astronomy/earth_craters/clearwater_west/index.html

The input I received from geologists during my research is that the
structure is the result of a "mantle-plume uplift. The analogy would be, if
you press a table tennis ball enough to cause a dent, it is almost perfectly
circular. The same effect happened at Hudson's Bay when the mantle plume
collapsed.

Or so the latest theory goes.....

Below is the quote from my article and the paper it is based on.
............................................................................
............................................................................
.................................
To the west of the Clearwater Craters is the east coast of Hudson Bay. This
circular coast is the result of a mantle-plume uplift, and IS NOT the result
of an impact event.
The arc of the east coast of Hudson Bay is illustrated in the upper left of
this shuttle picture. Richmond Gulf is immediately to the right of the
semi-circular shaped coast and Clearwater West meteorite crater is the
circular shape in the center of the picture. (courtesy NASA)
  1.. The sedimentary record of mantle-plume uplift", Robert H. Rainbird,
Richard E. Ernst; Geological Society of America Special Paper 352, 2001.
  2.. Negative results were reached by R. S. Dietz and J. P. Barringer in
1973 in a search for evidence of impact in the region of the Hudson Bay arc.
They found no shatter cones, no suevite or unusual melt rocks, no radial
faults or fractures, and no metamorphic effects. They pointed out that these
negative results did not disprove an impact origin for the arc, but they
felt that such an origin appeared unlikely.
............................................................................
............................................................................
.............................
Chuck
Ottawa

----- Original Message -----
From: "Charles R. Viau" <cviau_at_beld.net>
To: "'Charles O'Dale'" <codale0806_at_rogers.com>;
<meteorite-list_at_meteoritecentral.com>
Sent: Sunday, September 28, 2003 10:06 PM
Subject: RE: [meteorite-list] RE: NP Article, 12-1950 Meteorite Crater Found
in Canada


> Waiting for the day that some news comes of the ongoing investigations
> in Hudson Bay, that huge half circle that comprises part of the bay is
> striking in its uniformity. If it turns out to be an astroblehme , it
> would certainly be the largest ever found. If not, it is the closest
> nature has ever come to eroding out an almost perfect half circle in a
> coastline. The last I heard about this suspected impact site, was a 3
> year old article published by the Canadian Geologic Survey, saying that
> it was very difficult drilling core material up there, and it may take a
> long time before any kind of analysis is available. I also got the
> impression that they were having a hard time funding the work to be
> done. I also heard that there was a larger unconformity in the land mass
> around the coast (rim?) but there was no definitive evidence that it was
> caused by an impatct as yet. Anyone know of the principles involved in
> this search, or any new news?
>
> CharlyV IMCA_4351
>
> -----Original Message-----
> From: meteorite-list-admin_at_meteoritecentral.com
> [mailto:meteorite-list-admin_at_meteoritecentral.com] On Behalf Of Charles
> O'Dale
> Sent: Sunday, September 28, 2003 7:41 AM
> To: meteorite-list_at_meteoritecentral.com
> Subject: [meteorite-list] RE: NP Article, 12-1950 Meteorite Crater Found
> in Canada
>
> Please see my article on the Chubb Crater aka New Quebec Crater aka
> Pingualuit Crater at:
>
> http://www.ottawa.rasc.ca/astronomy/earth_craters/pingualuit/index.html
>
> Thanks
> Chuck
>
>
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>
Received on Mon 29 Sep 2003 07:00:36 AM PDT