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GLG310 Structural Geology. Physical character of faults 5 March 2016GLG310 Structural Geology

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Presentation on theme: "GLG310 Structural Geology. Physical character of faults 5 March 2016GLG310 Structural Geology"— Presentation transcript:

1 GLG310 Structural Geology

2 Physical character of faults 5 March 2016GLG310 Structural Geology http://geolmag.geoscienceworld.org/content/145/3/435/F3.expansion http://www.photoree.com/photos/permalink/891384-19756080@N00 http://www.gm.univ-montp2.fr/spip/spip.php?article761

3 Fault surfaces 5 March 2016GLG310 Structural Geology

4 http://homepage.usask.ca/~mjr347/prog/geoe118/geoe118.052.html

5 Physical character of faults http://geolmag.geoscienceworld.org/content/145/3/435/F3.expansion Woodcock and Mort, 2008

6 http://homepage.usask.ca/~mjr347/prog/geoe118/geoe118.052.html

7 Breccia Photomicrograph of fault breccia in the Antietam Formation, Blue Ridge province. Breccias form when rocks are extensively fractured in fault zones and are cemented together when minerals precipitate in the cracks and fractures. Note the angular fragments (fr) of quartz sandstone in a matrix of fine-grained iron oxide cement (ic). Field of View 4 x 2.7 mm, Cross Polarized Light. http://web.wm.edu/geology/virginia/provinces/Blueridge/fault_zone_lithology.html

8 Woodcock and Mort, 2008

9 5 March 2016 http://www.webpages.uidaho.edu/~simkat/geol345_files/2012lecture9.html

10 5 March 2016GLG310 Structural Geology http://www.carmeliet.arch.ethz.ch/People/Ferdowsi Gouge along fault zone is more easily eroded

11 5 March 2016GLG310 Structural Geology

12 SAFOD: hole and core

13

14 5 March 2016GLG310 Structural Geology http://www.gm.univ-montp2.fr/spip/spip.php?article761 The word "pseudotachylite" was coined early in the 1900s to name a peculiar glassy rock that looks sort of like tachylite but isn't. Tachylite ("TAK-a-lite") is a basaltic glass A psuedotachylite is a frictionally generated melt rock

15 5 March 2016GLG310 Structural Geology http://www4.nau.edu/meteorite/meteorite/book-glossaryp.html A psuedotachylite is a frictionally generated melt rock --formed by fault slip, but also impacts

16 5 March 2016GLG310 Structural Geology http://maps.unomaha.edu/maher/GEOL3300/week10/dsz.html Mylonite is a rock formed during shear with ductile mineral behavior (quartz), grainsize reduction (feldspar), and some grain growth

17 5 March 2016GLG310 Structural Geology http://en.wikipedia.org/wiki/Mylonite http://upload.wikimedia.org/wikipedia/commons/1/1e/Mylonite_Strona.jpg http://upload.wikimedia.org/wikipedia/commons/c/cd/Ska%C5%82a_zmyllonityzowana.jpg

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