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Zanskar Normal Shear Zone, NW India

 

Gumbaranjon injection network

Roberto Weinberg, Pavlina Hasalova, Melanie Finch, Lindsay Ward
Monash University, Australia

 

 

Copyright 2004-2011 by Roberto Weinberg. All rights reserved. Unlimited permission to copy or use is hereby granted for non-profit driven enterprise, subject to inclusion of this copyright notice and acknowledgment of the source URL: users.monash.edu.au/~weinberg.

 

I would very much appreciate an email stating how this material will be used: Roberto Weinberg, Monash University, Australia. Thanks, RW.

 

DISCLAIMER. The material on this website has not undergone the scrutiny of Monash University and does not conform to its corporate web design. It is entirely based on a free-spritied, curiosity-driven research effort by the author, and therefore in no way expresses the official position of the University.

 

 



S-C fabric

 


 

Zanskar shear plane Zanskar shear plane
a) S-C -C'fabric in porphyrytic orthogneiss at Reru close to the river and bridge. b) S-C -C'fabric in porphyrytic orthogneiss and narrow shear leucogranite dykes, at Reru close to the river and bridge.
Zanskar shear plane Zanskar shear plane
c) S-C -C'fabric in porphyrytic orthogneiss at Reru close to the river and bridge. d) S-C -C'fabric in porphyrytic orthogneiss and narrow shear leucogranite dykes, at Reru close to the river and bridge.
Zanskar shear plane Zanskar shear plane
e) S-C rotation of three parallel dykelets. Top-side down, normal shearing.



C'-S-C fabric

 


 

 

Zanskar shear plane Zanskar shear plane
e) An excellent example of C', on same granite as a and b. f) An excellent example of C', on same granite as a and b.
Zanskar shear plane Zanskar shear plane
g) An excellent example of C', on orthogneiss. h) S-C fabric and delta clasts derived from the breaking up of leucogranite dykes, cut by a synthetic shear zone, parallel to C'. Note that some of the veinlets are continuous over most of the photograph.

 



Layer truncation and breaking up

 


 

Zanskar shear plane Zanskar shear plane
i) A more competent Tml- leucogranite layer (underneath the lens cap), with an internal foliation, truncated by the C-plane of shearing, both above (right) and below (left) , parallel to layering. j) Detail of (i).



Asymmetric folding

 


 

Zanskar shear plane Zanskar shear plane
k)Continuous leucogranite dyke from upper left to lower right, folded asymmmetrically, and cut by synthetic shear zones, with right-side-down. l) on the right, folded leucogranite below a dyke parallel to C-plane and cut by normal synthetic shear zone.