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Zanskar Normal Shear Zone, NW India

 

Gumbaranjon injection network

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

 

 

 

 


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.