1. Earth Sciences Research Centre; Sultan Qaboos University; Al-Khodh; Muscat 123 Sultanate of Oman
2. Department of Earth Sciences & Centre for Planetary Science and Exploration; Western University; 1151 Richmond St. N. London Ontario N6A 5B7 Canada
3. Department of Physics; College of Science; Sultan Qaboos University; Al-Khodh; Muscat 123 Sultanate of Oman
4. Department of Physics and Astronomy; University of Western Ontario; London Ontario Canada