*Krishnan Sajeev¹, P Rajkumar², Ippei Kitano³, Durgalakshmi Durgalakshmi⁴, Madhusoodhan Satish-Kumar⁵, Sayantani Chatterjee⁶, Ian S Williams⁴, Eiichi TAKAZAWA⁵ (1.Centre for Earth Sciences, Indian Institute of Science, 2.Advanced Facility for Microscopy and Microanalysis, Indian Institute of Science, Bengaluru 560 012, India., 3.The Hokkaido University Museum, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan, 4.Research School of Earth Sciences, Australian National University, Canberra 2601, Australia, 5.Department of Geology, Faculty of Science, Niigata University, Niigata 950-2181, Japan, 6.Earthquake Research Institute, The University of Tokyo, Tokyo113-0032, Japan )