Doesn't one large asteroid (miles across) have multiple types of
meteoritic material? Iron at the core, silicate and iron mix surrounding
that, chondritic material, and achondritic nearer the surface of an
asteroid. Or am I watching too many meteorite videos? ;)
If accretion is correct and iron migrates to the center of a large body,
then it would make sense that lighter less dense materials would
surround that. When two asteroids impact wouldn't they cause all these
types to intermingle and spray out in all directions? In addition they
create impact melts and breccias as well. What about carbonaceuous
chondrites?
If two large asteroids crashed into one another some million years or so
ago wouldn't there be huge numbers of all different types of material
thrown out into all directions? Couldn't there be multiple falls
consisting of different types of meteorites but originating from the
same event in space? I realize I may be missing some important facts
here but if large asteroids do in fact consist of all meteoritic
composition types, couldn't you argue that some or all of these falls
may come from one event? I know this question might have a few people
yelling at me that I don't know what I'm talking about. You're right!
That's why I'm asking... ;)
Regards,
Eric
[email protected] wrote:
It looks like we're on track to have one meteorite per month:
Oct. Sudan (2008 TC3)
Nov. Buzzard Coulee
Dec. Tamdakht
Jan. Denmark
Feb. West
Mar. Augusta, GA?
One per month is a great fall rate, and I hope they keep coming!
Still, I don't think this activity is high enough to support your
theory of a debris cloud. Notice that the 5 most recent confirmed
falls have been 5 different types: Sudan is ureilite, Buzzard Coulee
is H4, Tamdakht is H5, Denmark is a carbonaceous chondrite, and West
is L6. How would your theory support such a variety of incoming
material?
My theory: more fireballs and meteorites are getting reported, but
that doesn't necessarily mean more fireballs and meteorites are
occuring. I'd like to make 4 points:
1. Each year, the Earth's population increases.
2. More people are learning about what meteorites are, thanks to
mainstream TV shows on the History Channel, etc.
3. More people are learning that meteorites are worth big $$$, thanks
to news coverage.
4. Each year, more and more people are getting connected to the
internet.
Put all of this together, and you have: more people + more awareness +
more motivation + a global way to get news out. Personally, I think
this explains the higher number of fireballs and witnessed falls
getting reported each year.
I'd like to know what others think about this.
I'd also say that over the past year or two, the meteorite collecting
community has become much more focused on witnessed falls and
hammers. This means we're not letting any suspected falls get
overlooked. If this Georgia fireball had happened a few years ago,
would it have gotten this much attention on the list?
All the best-
--Noah
----- Original Message ----- From: "Meteorites USA"
<[email protected]>
To: <[email protected]>
Sent: Monday, March 30, 2009 11:22 AM
Subject: [meteorite-list] Fireballs From The Sky: Bombarded
Over the past few months or so I've been tracking many fireball
sightings and suspected new falls all over the world. Recently we've
had no fewer than 4 right here in the United States. Not to mention
the Denmark fall, Tamdaught, West, Westchester, Augusta, Sacramento,
and the Merced Fireball. And the largest meteorite fall in Canadian
history Buzzard Coulee! I'm sure I'm forgetting some.
Now another big event near MD, VA area:
http://www.wtop.com/?nid=600&sid=1636442
<http://www.wtop.com/?nid=600&sid=1636442>
I asked this a week or so ago, but got very little response other
than "yeah sure".
Isn't this abnormally high meteor activity? Is our planet traveling
through a large field of asteroidal space debris right now? How can
some many fireballs and meteorite falls happen in such a short period
of time unless this were the case?
Regards,
Eric Wichman
Meteorites USA
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______________________________________________
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Meteorite-list mailing list
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http://six.pairlist.net/mailman/listinfo/meteorite-list
--
Regards,
Eric Wichman
Meteorites USA
http://www.meteoritesusa.com
904-236-5394
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