[meteorite-list] Shocked or not shocked?

From: Horace Heffner <hheffner_at_meteoritecentral.com>
Date: Fri, 27 Mar 2009 03:37:24 -0800
Message-ID: <54E63A4F-9E47-41ED-818B-DB28827E4BBC_at_mtaonline.net>

Question: does this basalt look like it is shocked?

Optical 40x and 100x.

http://www.mtaonline.net/%7Ehheffner/RockPhotos/S2TwistA40x.jpg

http://www.mtaonline.net/%7Ehheffner/RockPhotos/S2BundlesD100x.jpg

http://www.mtaonline.net/%7Ehheffner/RockPhotos/S2BundlesB100x.jpg

Electron micrograph 300x:

http://www.mtaonline.net/%7Ehheffner/RockPhotos/HH1_01_300x_30kV_02.jpg

These small multi-oriented and broken grain features seem to match
some shocked material photos here:

http://www.fas.org/irp/imint/docs/rst/Sect18/Sect18_3.html


At least one local granite rock looks like this, even in much larger
magnification:

http://www.mtaonline.net/%7Ehheffner/RockPhotos/LocalBasaltA40x.jpg

http://www.mtaonline.net/%7Ehheffner/RockPhotos/LocalBasaltB40x.jpg

http://www.mtaonline.net/%7Ehheffner/RockPhotos/
20090327localBasaltInterior10x.jpg

http://www.mtaonline.net/%7Ehheffner/RockPhotos/
20090327localBasaltCrust10x.jpg

The above, to my untrained eye, looks to be not shocked, while the
first set of photos show shocked basalt. The question is, do the
first set of photos actually show a basalt that is shocked?

HH
Received on Fri 27 Mar 2009 07:37:24 AM PDT