*Rajkumar Perumal¹, Krishnan Sajeev¹, KUMAR R. S.², Vinod Samuel³, Kim S. W.³, Justin K Antony² (1.Indian Institute of Science, Bangalore India, 2.Department of earth sciences, Annamalai University, Annamalai nagar, India, 3.Yonsei University, Department of Earth Sciences, South Korea)