Kimberlite pipes |
Kimberlite pipes |
Feb 28 2012, 10:41 AM
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#1
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Rock Bar! Group: Members Posts: 426 Joined: 6-February 04 Member No.: 84 |
Here's a little item I found on another forum.
http://www.sciencenews.org/view/generic/id...onds_to_surface This thin slice of a kimberlite rock from northern Canada, seen through a microscope and in polarized light, shows colorful minerals caught up in magma that rose from deep within the Earth. Leonard |
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Feb 28 2012, 06:02 PM
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#2
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Rock Bar! Group: Members Posts: 613 Joined: 16-October 08 From: Central Colorado Member No.: 6,813 |
I use thin sections frequently but I thought it would be nice to add a "hand specimen" in here to help those prospecting for pipes to ID kimberlite in the field. Here's a pic of a kimberlite sample from my private collection. It came from a diamond bearing pipe in northwest Canada;
The interesting thing I've discovered is that some kimberlite thin sections look very much like meteorite thin sections, in a general way. Kimberlite grains are often rounded much like chondrules that are seen in meteorites. Here is a pic I just took of a thin section I have from a kimberlite pipe in Fayette County Pennsylvania; Now compare that kimberlite thin section to a meteorite I found last summer; You can see the rounded grains that I think are the result of high speed erosion, in the pipe on the way up, or in space when the dust grains accumulate at cosmic velocitiy. Of course this is only my opinion but it is rather interesting, don't ya think? ASTROBLEME -------------------- Annual Dues Paying Member Since 2008
Tonko Mining Company "Some day this crater is going to be a greatly talked about place, and if the above credit is due, as is certainly the case, I would like to have it generally known for the sake of the children." Daniel Moreau Barringer 2/1/1912 in a letter about the Barringer Meteorite Crater, Arizona USA |
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Feb 28 2012, 07:03 PM
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#3
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Rock Bar! Group: Members Posts: 426 Joined: 6-February 04 Member No.: 84 |
I use thin sections frequently but I thought it would be nice to add a "hand specimen" in here to help those prospecting for pipes to ID kimberlite in the field. Here's a pic of a kimberlite sample from my private collection. It came from a diamond bearing pipe in northwest Canada; The interesting thing I've discovered is that some kimberlite thin sections look very much like meteorite thin sections, in a general way. Kimberlite grains are often rounded much like chondrules that are seen in meteorites. Here is a pic I just took of a thin section I have from a kimberlite pipe in Fayette County Pennsylvania; Now compare that kimberlite thin section to a meteorite I found last summer; You can see the rounded grains that I think are the result of high speed erosion, in the pipe on the way up, or in space when the dust grains accumulate at cosmic velocitiy. Of course this is only my opinion but it is rather interesting, don't ya think? ASTROBLEME I'm ready for a trip to northern colorado whenever anyone that knows what they are doin wants an assistant. Leonard |
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