Heavy Minerals in 2004 Tsunami Deposits on Kho Khao Island, Thailand
R. Jagodziński, B. Sternal, W. Szczuciński, S. Lorenc
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Institute of Geology, Adam Mickiewicz University, Maków Polnych 16, 61-606 Poznań, Poland
Pol. J. Environ. Stud. 2009;18(1):103-110
Heavy mineral assemblages were studied in onshore sandy deposits from the 26 December 2004 tsunami on Kho Khao Island, southern Thailand. The most common minerals included tourmalines, zircon, muscovite, biotite, limonites and opaque minerals. An abundance of micas and depletion in tourmalines allowed us to distinguish the tsunami deposits from modern beach sediments and pre-tsunami soils. Major lateral and vertical changes in the studied profiles were related to an increase in flake-shaped micas upward in the tsunami sequence as well as landward. These variations, although documented for one grain size fraction, corresponded well with changes in the grain size distributions of the whole samples. The observed changes probably reflect wave hydrodynamics and a change in the sedimentation mode from bed-load deposition to settling of the suspended load.
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