Polish Journal of Environmental Studies
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ISO Abbrev. Title: Pol. J. Environ. Stud.

Vol. 18, No. 1 (2009), 93-101


Diatom Assemblages in 26 December 2004 Tsunami Deposits from Coastal Zone of Thailand as Sediment Provenance Indicators

M. Kokociński1,2, W. Szczuciński3, A. Zgrundo4, A. Ibragimow5

1Collegium Polonicum, Adam Mickiewicz University, Kościuszki 1, 69-100 Słubice, Poland
2Institute of Environmental Biology, Adam Mickiewicz University, Umultowska 89, Poznań, Poland
3Institute of Geology, Adam Mickiewicz University, Maków Polnych 16, 61-606 Poznań, Poland
4Institute of Oceanography, University of Gdańsk, Bażyńskiego 1a, 80-952 Gdańsk, Poland
5Jeziory Ecological Station, Adam Mickiewicz University, Jeziory, P.O. Box 40, 62-050 Mosina, Poland


Abstract: Tsunami deposits are often characterized by specific diatom assemblages, which may indicate sediment provenance and help identify paleotsunami deposits. In the present study diatom assemblages were studied in tsunami deposits left by the 2004 tsunami in Thailand, as well as in beach sediments, inner shelf marine sediments and freshwater ponds and streams. The assemblages in tsunami deposits had chaotic structure and consisted of species found in all the studied habitats, suggesting erosion of terrestrial and marine sediments by tsunami. The diatom frustules in tsunami deposits were generally rare and often damaged due to excessive wave force. The most common identified species were Amphora turgida Gregory, Cocconeis scutellum Ehrenberg, Diplomenora cocconeiformis (Schmidt) Blazé, Eunotogramma marinum (W. Smith) Peragallo (typical for benthos of marine and brackish environments), and taxa common in freshwaters, including Cyclotella ocellata Pantocsek, Cocconeis placentula Ehrenberg and Encyonema silesiacum (Bleish) D.G. Mann.

 

Keywords: diatoms, tsunami deposits, inner shelf, provenance, Andaman Sea


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