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Zanskar Shear Zone, NW India
2004-2011 by Roberto Weinberg. All rights reserved. Unlimited
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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.
|a) The "main shear plane" at Reru defining typical topography.||b) Leucogranite sills accumulated underneath the plane on(a).|
|c) The "main shear plane" at Mune Gompa.||d) The "main shear plane" at Pensi La separating a lighter rock mass (presumably orthogneisses and granites) below from a metasedimentary rocks (presumably biotite quartzites and schists).|
|e) The shear zone to the west of Pensi La (no further information available).||f) Same.|
|a) Injection complex below the Gumbaranjon peak. This complex is characterized mostly by layer parallel sills of Tml-Gnt-Ms-Bt leucogranite.||b) detail of (a).|
|c) Gumbaranjon peak showing leucogranite intrusions, mostly sills parallel to the main shear foliation, cut by a steep (60 degree) normal fault. Granite intrusions decrease upwards into a dominantly biotite quartzite and biotite (garnet-staurolite) schist.||d) detail of (a).|
|e) Leucogranite injection complex, Gumbaranjon area.||f) Same but further up the mountain side. The patch of snow in the middle matches the one in (e). Notice decrease in density of intrusion.|
|g) Leucogranite injection complex, Tangsyo-Key valley. Granite sheets have different angles in relation to the dominant, gently dipping to the north (right) bedding/shear plane. The marked layer of country rock has granite sheets at high angle to the shear plane, whereas above this layer granite sheets are sheared towards the dominant thrust plane, and seem to define the characterising stepping upwards to the right indicative of high strain in a top-to-the-north normal shear zone. Scale: estimated 200-300m in vertical.||h) ????|
|a) Thrusting to the SE on the north side of Kargyak Chu (ZNK09-23 N33 14' 19.0" E 77 05'58.2"). Notice bending of steep foliation planes into gently dipping planes. Scale ~50-100 m in vertical.||b) Thrusts at a smaller scale striking at N10E/25E, lcren=352/0-5 (motion interpreted to be perpendicular to crenulation, to the E, based on stretching lineation in other neighbouring outcrops.|
|c) Same as (b) (ZNK09-23 N33 14' 19.0" E 77 05'58.2").||d) Same as (b).|
|e) Thrust plane striking N58E/35SE Lint= 057/00, S-C fabric and drag folds perpendicular to Lint indicate thrusting to the NW. The sheared rock is an orthogneiss with leucosomes, and tml-leucogranite is discordant (post-dates thrusting (ZNK09-31 N33 18' 23.1" E 76 58'52.1").||f) Detail of (e).|
|g) Thrust plane dipping gently to the right and steeper bedding defining sense of movement to the left on photograph (ZNK09-24 N33 14' 22.3" E 77 09'59.3"). Scale estimated at ~50 m in vertical.||h) Large scale recumbent to inclined asymmetric folds verging to the E and riding on thick thrust planes. Notice the river at the bottom right hand-side. Scale estimated at ~50 m in vertical.|
|a) Normal pervasive shearing on gentle plane (shear sense to the right). Scale: tens of metres in horizontal. Close to Reru.||b) Normal pervasive shearing on gentle plane (shear sense to the right) PROVIDE LOCATION AND ATTITUDE. Scale: tens of metres in horizontal.Close to Reru.|
|c) Steep normal shear band 50 cm- 1 m wide.||d) Normal shearing of heterogeneous orthogneiss. Close to Reru. THIS SECTION IS MISSING THE OVERPRINT RELATIONSHIP|