[meteorite-list] The Mystery of the Missing $40, 000 Doorstop (Aggie Creek Meteorite)

From: Ron Baalke <baalke_at_meteoritecentral.com>
Date: Sun Sep 10 22:20:59 2006
Message-ID: <200609110220.TAA17675_at_zagami.jpl.nasa.gov>

http://www.sitnews.us/0906news/090906/090906_ak_science.html

The Mystery of the Missing $40,000 Doorstop
By Ned Rozell
SitNews
September 9, 2006

"Wanted: a 40-pound chunk of Alaska's largest meteorite. May currently
be employed as your doorstop. Call University of Alaska Museum."

Roland Gangloff never ran that classified ad, but he might have
considered it. Gangloff, former earth science curator at the museum,
once uncovered a mystery when researching the Aggie Creek meteorite, the
largest heavenly body fragment ever found in Alaska. When miners
discovered the iron-nickel meteorite clanging around in the rock tumbler
of a gold dredge in 1942, it was reported to weigh about 95 pounds.
Today it weighs 57 pounds. Its curious weight-loss program is what
Gangloff calls "one of those great Alaska mysteries."

The mystery of the Aggie Creek meteorite began long, long ago. No one
knows exactly how it was formed, but here's a possible scenario: A
planetary body large enough to have a solid core broke apart after a
violent collision with something bigger. Fragments scattered, including
iron-nickel chunks from the core. After a collision with other
space-borne matter, a piece was sent hurling toward the Earth. Earth's
gravitational pull drew the metal chunk closer. The meteor heated into a
glowing mass as it whizzed through the atmosphere, and it was large
enough that it didn't melt to nothing, as do most meteors that enter the
atmosphere.

It whistled like a World War I mortar as it sped toward the area where
Aggie Creek now flows from Fish River, about 15 miles east of Council on
the Seward Peninsula. With a heavy thud, the metal chunk became a
meteorite when it struck the ground in the Aggie Creek watershed. Years
later, in 1942, miners noticed a way-too-heavy rock banging through
their gold dredge.

Eskil Anderson, a mining geologist from Spokane, flew to Aggie Creek,
brought the meteorite to Nome and then donated it to the University of
Alaska Museum.

The Aggie Creek meteorite is one of the rarer types of those two dozen
or so meteors a year that survive the trip through the atmosphere to
strike Earth. Most common, and most difficult to identify as
otherworldly, are stone meteorites. A distant second goes to meteorites
composed of stone mixed with iron. Solid metal meteorites, such as one
found at Aggie Creek, are rare finds indeed.

The Aggie Creek meteorite now sits within a vault in the belly of the
museum. About the size of a football but as heavy as a truck battery,
the meteorite looks like a rusted orange rock with thumb print
indentations, caused by uneven melting during its downward plunge toward
Earth.

One end of the meteorite has been sliced off. Gangloff said three other
institutions, in Washington, D.C., Chicago, and Arizona, have samples of
the Aggie Creek meteorite. But he said those pieces, swapped for
meteorites the University of Alaska Museum didn't have, would
collectively weigh nowhere near the missing 40 pounds.

"Somewhere along the line somebody sliced half of it off and gave the
rest to the museum," Gangloff said after pondering the missing metal.
Later, he speculated that perhaps several meteorites were collected and
weighed together. Other possibilites are that the meteorite was weighed
with a faulty scale or was inaccurately listed in the Catalogue of
Meteorites.

If it wasn't a typographical error, a chunk of the meteorite may now be
languishing somewhere around Alaska, perhaps holding open a door in some
long-abandoned mine office.

There is incentive to find it. Gangloff said because the Aggie Creek
meteorite is worth somewhere in the neighborhood of $40,000, a companion
piece may be worth as much, or even more if the combination of pieces
makes an even rarer piece of celestial metal.

That's some doorstop.
Received on Sun 10 Sep 2006 10:20:55 PM PDT