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5.10: A4 Mylonite 1

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    Outcrop and Hand Sample Photos and Videos

    Click on the image to enlarge.

    This is one continuous outcrop containing mylonite 1 (this page) and mylonite 2 (next page). Can you see the mylonite fabric (looks like a foliation) in the rock? The protolith of Mylonite 1 was probably one of the Cranberry Gneiss units.


    This cut hand sample shows the mylonite texture in more detail.

    Thin Section Photos and Videos

    1st = plane polarized light; 2nd = cross-polarized light.

    Hopefully you can see porphyroclasts (augens) and mylonite texture in the thin section images below. Porphyroclasts are mostly qtz, rusty brown layers are clays produced by shearing.


    Entire thin section scan. 1st = ppl; 2nd = xpl. 


    This page titled 5.10: A4 Mylonite 1 is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Elizabeth Johnson and Juhong Christie Liu (Virtual Library of Virginia) via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.

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