1. Department of Astronomy, Space Science and Geology, Chungnam National University, Daejeon 34134, Republic of Korea
2. School of Mining and Geology, University of Rwanda, Kigali 3900, Rwanda
3. Department of Geological Sciences, Chungnam National University, Daejeon 31134, Republic of Korea
4. Department of Geography & Anthropology, Louisiana State University, Baton Rouge, LA 70803, USA