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'Pressure Shadows' in Daling Phyllite'


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1 Geological Survey of India, Calcutta, India
     

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'Pressure shadows' developed at the fringes of porphyroclasts of quartz, feldspar and rock fragments in gritty phyllite of Daling series, have been described in detail. Besides quartz, the 'pressure shadows' contain some secondary chlorite. They show a marked dimensional orientation and grain size variation vis-a-vis the distance from the controlling face. The mode of origin is suggested in the light of Riecke's principle.
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  • 'Pressure Shadows' in Daling Phyllite'

Abstract Views: 271  |  PDF Views: 4

Authors

C. Karunakaran
Geological Survey of India, Calcutta, India
Subimal Sinha Roy
Geological Survey of India, Calcutta, India

Abstract


'Pressure shadows' developed at the fringes of porphyroclasts of quartz, feldspar and rock fragments in gritty phyllite of Daling series, have been described in detail. Besides quartz, the 'pressure shadows' contain some secondary chlorite. They show a marked dimensional orientation and grain size variation vis-a-vis the distance from the controlling face. The mode of origin is suggested in the light of Riecke's principle.