Dyke swarm features in Shyok, Ladakh

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Leucogranite dykes of the Pangong Range, Eastern Karakoram, Ladakh

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.

Fig. 1a. Leucogranite and pegmatite dykes. Note person for scale at the bottom of the photo. Steep exposure between Tangtse and Muglib

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Fig. 2a. Leucogranite dyke through calc-silicate rock (dark green tinge) spreading laterally into a sill below a 50 cm wide zone of migmatitic biotite-schist. Note internal layering in leucogranite parallel to its margins. Steep exposure in the Tangtse - Muglib gorge.

Detail of a.

Fig. 3a. Leucogranite dyke injection.
Vertical exposure in the Darbuk-Shyok gorge.

Fig. 3b, c. Injections in the same area as Fig. 3a.

Fig. 4. Early medium-grained dykes and late coarse-grained dyke. Deformation caused indentation of the less competent finer grained dyke. Steep exposure in the Darbuk-Shyok gorge.

Fig. 5. Early finer grained dykes in intermediate calc-alkaline intrusion, cross cut by later coarse-grained leucogranite. Both folded. Outcrop in the vicinity of Fig. 4.

Fig. 6 (3973). Dykes through diorite. Shyok valley.

Fig. 7 (3979). Spider dykes, where three pegmatite dykes with different orientations merge with no apparent cross-cutting relationships. Shyok valley.

Fig. 8 (1441). Dyke through diorite. Shyok valley.

Fig. 9 (1442). Same. Shyok valley.

Fig. 10 (1457). Dyke through diorite. Shyok valley.

Fig. 11 (1459). Two dykelets diverging at 90 degrees. Shyok valley.

Fig. 12(1347). Two dyke phases. The earlier dyke (horizontal in photo) has large hornblende grains. Shyok valley.

Fig. 13 (1344). Folded leucocratic dykes. Shyok valley.

Fig. 14 (1438). Shyok valley.

Fig. 15 (1443). Two dyke phases, later one on shear planes.

Fig. 16 (1468). Shyok valley.