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Nathula Fault

 

deformed cross-bedding

Roberto Weinberg, Monash University, Australia
and Malay Mukul, Indian Institute of Technology Bombay

 

 

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This site brings together photographs documenting the brittle faults on the road between Gangtok and Nathula Pass in Sikkim.

 


 

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Fig. 1a) Nearly 2m thick fault rock and orthogneiss in hanging wall.
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Fig. 1b) Same fault.
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Fig. 1c) Same fault.
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Fig. 1d) Same fault showing curved foliation on the handing wall.
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Fig. 1e) Brittle faults associated with dragging in gneiss suggesting brittle overprint of ductile shearing
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Fig. 1f) fault gouge in two bands
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Fig. 1g) Brittle faulting.
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Fig. 1h) Fault gouge only 2cm thick.
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Fig. 1i) A cataclasite layer 1 cm thick.
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Fig. 1j) Fault gouge only 2cm thick.
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Fig. 1k) A cataclasite layer 1 cm thick.
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Fig. 1l) Fault rock above the gneiss. This is the footwall, matching the hanging wall in Fig. 1a and b.
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Fig. 1m)
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Fig. 1n) Fault rock, comprising a breccia, cataclastic layers and fault gouge. Altogether more than 3m thick below an orthogneiss.

Fault at Kyongnosla

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Fig. 2a) Fault at Kyongnosla.
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Fig. 2b) Fault rock, weathered.
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Fig. 2c) Fault rock, weathered.