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NWA 6711   contributed by Steve Brittenham, IMCA 2184   MetBul Link


Roll Overs:     #1   #2   #3   #4   #5   #6    


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Copyright (c) Steve Brittenham.
23.2 grams. 3.25 x 2.5 inches.   Eucrite

TKW 714 grams. Fall not observed. Found 2009.
 


Steve writes:
This class of meteorite typically represents basaltic rocks from surface lava flows on its parent body. But NWA 6711 is somewhat unusual, exhibiting what has been interpreted as pyroclastic flow through it (Photo 1 - the finer grained tan vein bisecting the coarser grained gray speckled eucritic matrix).

Thin section views of this area are shown in the Photos 2 through 6. Photo 2's eucritic areas aren't particularly unusual, but Photo 3 shows the fine-grained channel cutting horizontally through the coarser grained eucritic material at the top and bottom of the image (Photo 4 provides another view, this time of a wider portion of the channel where the eucritic material is only at the bottom of the image).

Photo 5 illustrates how the flow material changed from one side of the thin section to the other. Coarser eucritic material can be seen "floating" within it in the right half of that image - this is not unique, as evidenced by a second example seen in Photo 6.


  Click to view larger photos     Photo 1     Photo 2     Photo 3     Photo 4     Photo 5     Photo 6
 


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Jim brady
 8/13/2017 2:41:31 PM
Nice---would love to hear from the classifying scientist, very interesting
Steve Brittenham
 8/12/2017 4:36:39 AM
Hi Jean-Alix. I appreciate the correction. This is the term that was explained to me, but I'm a real amateur at all of this, so thanks! If you have any additional explanation, I'd very much welcome it. Again, thanks - I certainly learn a lot from Paul's readers!
Jean-Alix Barrat
 8/12/2017 1:27:18 AM
A very nice sample but the words "pyroclastic flow" for the vein are certainly not correct. These pictures are superb. Congratulations to the photograph.
 

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