Polygonal Cracks in Bhuban Sandstones of Surma Basin, North East India
Authors
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Department of Geology, Pachhunga University College, Aizawl – 796 001
V. Vanthangliana -
Department of Geology, Pachhunga University College, Aizawl – 796 001
Lal Dinpuia
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Department of Environmental Studies, North-Eastern Hill University, Shillong – 793 022
Devesh Walia
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Department of Geology, Pachhunga University College, Aizawl – 796 001
Saitluanga Sailo
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Department of Geology, Pachhunga University College, Aizawl – 796 001
H. Lawmkima
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Department of Geology, Pachhunga University College, Aizawl – 796 001
Lalhming Sangi
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Department of Geology, Pachhunga University College, Aizawl – 796 001
Bubul Bharali
DOI:
https://doi.org/10.1007/s12594-020-1483-3Keywords:
No Keywords.Abstract
A crack system found developed on the surface of sandstone belonging to Bhuban Formation of Surma Group near Vanchengpui village in Mizoram. These polygonal crack system with circular or disc shape cracks overlapping one another are the conspicuous characteristic feature representing their process of formation. The crack system is developed on the domal surface of the exposed bed-rock and are limited to the top thin layer. The thickness of crack bearing layer varies from 3 to 13 cm and the cracks maintain perpendicular relationship with the slope surfaces. Field investigations and analysis of the crack present in the area reveals that the crack system developed in the sandstone are due to weathering processes coupled with compressive stresses.
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