Quality characteristics of Ilmenit minerals in the south central of Vietnam by SEM and QEMSCAN analysis
- Authors: Hiep Huu Nguyen 1 *, Carter Andrew 3, Din Bui Dao 4, Luc The Trinh 3, Chi Kim Thi Ngo 2, Dao Anh Vu 2, Binh Van Phan 2, Huy Quang Nguyen 5
1 Center for Excellence in Analysis and Experiment, Hanoi University of Mining and Geology, Vietnam;
2 Geology Falcuty, Hanoi University of Mining and Geology, VietNam ;
3 Department of Earth and Planetary Sciences, Birkbeck University of London, U.K;
4 Office of Ministry of Natural Resources and Environment;
5 Northwest Geological Division, General Department of Geology and Minerals of Vietnam
- *Corresponding:nguyenhuuhiep@humg. edu. Vn
- Received: 19th-Nov-2019
- Revised: 3rd-Jan-2020
- Accepted: 28th-Feb-2020
- Online: 28th-Feb-2020
- Section: Geology - Mineral
Placer deposit along the South Central Coast of Viet Nam is formed by the enrichment of heavy minerals through a combination of transportation, weathering, erosion and deposition processes. Ilmenite placer forms continuously along the South Central Coast from local origin when the shoreline is far from the modern shoreline formed during the marine transgression process from the late Plestocene to Holocene. The morphological and localization characteristics of Ilmenite have been clarified on the distribution trend with SEM method combined with QEMSCAN. Meticulous research on Ilmenite's grain structure and chemical composition in the study area has shown a tendency to significantly enrich the quality of Ti placer according to the upward trend in the north-south direction. In the south, the Ilmenite placer has smaller particle size but better selective roundness and better quality than in the northern part of the study area. The enrichment of TiO2 content with increasing trend from North to South was observed due to the strong weathering process associated with ancient coastline which is very far away from current shoreline so heavy minerals are accumulates locally and light minerals are carried away. The southern region of the South Central Coast region is home to the highest gap between the ancient shoreline and the current coastline. This study has shown the trend of the quality distribution of Ilmenite as well as of other heavy minerals as the basis for future mineral exploration planning.
Dung, B.V., Stattegger, K., Unverricht, D., Phung, V.P., Nguyen, T.T. (2013). Late Pleistocene-Holocene seismic stratigraphy of the Southeast Vietnam Shelf. Global and Planetary Change, Vol. 110, pp. 156-169.
Hennig, J., Breitfeld, H.T., Gough, A., Hall, R., Long, T.V., Kim, V.M., and Quang, S.D. (2018). U-Pb zircon ages and provenance of upper Cenozoic sediments from the Da Lat Zone, SE Vietnam: Implications for an intra-Miocene unconformity and paleo-drainage of the proto–Mekong River. Journal of Sedimentary Research, Vol. 88, No. 4, pp. 495-515.
Hiep, N.H., Carter, A., Long, H.V., and Vu, S.T. (2018). Provenance, routing and weathering history of heavy minerals from coastal placer deposits of southern Vietnam. Sedimentary Geology, Vol. 373, pp. 228-238.
Quang-Minh, D., Frechen, M., Nghi, T., Harff, J. (2010). Timing of Holocene sand accumulation along the coast of central and SE Vietnam. International Journal of Earth Sciences, Vol. 99, No. 8, pp. 1731-1740.
Stattegger, K., Tjallingii, R., Saito, Y., Michelli, M., Nguyen, T.T., Wetzel, A. (2013). Mid to Late Holocene sea-level reconstruction of Southeast Vietnam using beach rock and beach-ridge deposits. Global and Planetary Change, Vol. 110, pp. 214-222.
Thuy, N.T.B., Muharren, S., Wolfgang, S., Fukun, C. (2004). Granitoids in the Dalat zone, southern Vietnam: age constraints on magmatism and regional geological implications. International Journal of Earth Sciences, Vol. 93, pp. 329-340.