Hmm, the reasons could be, anything you or I or another learned person might
care to suggest. It may even be a combination of causes, ranging from,
another secondary basaltic flow of material, heating underlying layers, a
whopping huge impact on the material from an impacting meteoroid, a series
of rather close calls to our Sun, during its travels in space. If it's from
Venus, perhaps just sitting on the surface would leech out any low temp
minerals, after reading about the sulphide snows on the mountain tops there.
The alterations may also be due to a sustained period of time on Earth, with
water leeching out soluble minerals, after being rained on many times.
Anyone else care to add to the reasons for alteration and metamorphism in
meteorites, folks?
Kevin.
Hi Kevin,
Thank you for the reply. What would cause the low level metamorphism? I
only have the 3 inch core to look at but I can see several vugs in an area
of darker magnetic material that looks like magnetite. The surrounding area
is the color you would see in a Fracnonia cross section.
thanks again.
Jerry
----- Original Message ----- From: "Kevin Forbes" <[EMAIL PROTECTED]>
To: <[email protected]>
Cc: <[EMAIL PROTECTED]>
Sent: Saturday, November 12, 2005 9:52 AM
Subject: RE: [meteorite-list] Re: Vugs in Chondrite meteorites
Hi Jerry, may I take a stab in the dark and suggest that this sample has
undergone some form of low level metamorphism which has caused an amount
of low temperature minerals to become liquified or gaseous in nature,
redistributing them throughout the sample, then cooling and
recrystallizing.
Just a thought after looking at it.
Kevin.
Hi List
I am seeking information on why one would discovered very small crystals
in a chondrite vug. I have photos posted at the below web site of the two
different crystals discovered in a core sample taken from the 75 pound
meteorite discovered recently near Lake Havasu City, Arizona. The vugs
were discovered in the broken end of the core sample -3 inch core 1 and
3/8 inched wide. The meteorite is a chondrite and most likely a H-5 or
L-6. There is a photo posted of a section of polished core about 1½
inches into the meteorite. In this photo you can see chondrules and iron
and nickel pieces.
Thank for your input.
Jerry
http://www.ctaz.com/~jsbaird/Orange%20Nikon1.jpg
http://www.ctaz.com/~jsbaird/ClearCrystalNikon1.jpg
http://www.ctaz.com/~jsbaird/Polished%20Section.jpg
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