Skip to main content
Geosciences LibreTexts

5.10: A4 Mylonite 1

  • Page ID
    11143
  • 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.

    Thumbnail for the embedded element "A4 Mylonite 1 hand sample"

    A YouTube element has been excluded from this version of the text. You can view it online here: pb.libretexts.org/petrology/?p=325

    Thin Section Photos and Videos

    Click on the image to make it larger. 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. Click on the image to make it larger.