Nongmaithem Menaka Chanu, IIT Roorkee, Department of Earth Sciences, Roorkee, India, Sagarika Mukhopadhyay, Indian Institute of Technology Roorkee, Department of Earth Sciences, Roorkee, India and Amit Kumar II, National Centre for Polar and Ocean Research,ESSO, Ministry of Earth Sciences, Government of India, GeoScience Division, Headland Sada,Vasco Da Gama , Goa, India