Joints as fingerprints of stress in the quaternary carbonate deposits along coastal Saurashtra,Western India |
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Authors: | Uday Bhonde Nilesh Bhatt |
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Institution: | (1) Geochronology and Isotope Geology Division, Geological Survey of India, 15 Kyd Street, Kolkata, 700016, India;(2) Department of Earth and Environmental Science, K.S.K.V. Kachchh University, Bhuj, 370001, Gujarat, India |
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Abstract: | Coastal cliffs and shore platforms are important geomorphic features of coastal areas of Saurashtra. These features are composed
of medium to coarse grained carbonate sand and are designated as “Miliolitic limestones” that range in age from Middle to
Late Pleistocene. Significant jointing has been observed in the Middle Pleistocene Miliolite Formation as well as in the younger
shell limestone that comprises Chaya Formation of Late Pleistocene. Along with NE-SW trend which is the direction of maximum
horizontal compressive stress SHmax] for Indian sub-continent, other trends recorded are NNE-SSW, N-S, NW-SE and E-W. When compared with other regional studies,
neotectonic episode in Saurashtra peninsula appears to be younger than at least 125ky. The present study on joint sets also
indicates that they are important to understand stresses associated with anticlockwise rotation of the Indian plate. |
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