Punctuated progradation of the Seven Mile Beach Holocene barrier system, southeastern Tasmania
作者： Thomas S.N. Oliver , Paul Donaldson , Chris Sharples , Michael Roach , Colin D. Woodroffe
DOI: 10.1016/J.MARGEO.2017.02.014
关键词: Sedimentary depositional environment 、 Shore 、 Geomorphology 、 Landform 、 Foredune 、 Deposition (geology) 、 Progradation 、 Paleontology 、 Holocene 、 Geology 、 Accretion (coastal management)
摘要: Abstract Prograded barriers are depositional coastal landforms which preserve past shoreline locations and have been studied in order to understand the fundamental drivers of barrier formation. This paper reconstructs Holocene history Seven Mile Beach, prograded Tasmania, Australia using optically stimulated luminescence (OSL) dating, ground penetrating radar (GPR), light detection ranging (LiDAR) elevation models sedimentological analyses. Shoreline progradation commenced around 7300 years ago continued near present despite a ~ 3000 pause deposition between 6700 3600 years indicative substantial changes sediment availability. GPR imaged subsurface structures contain record seaward dipping reflectors preserved as supplied beaches dunes leading progradation. In 500 years large transgressive dune has formed, built from reworked sands, now dominates eastern portion implying that ceased. study reaffirms notion relict foredune ridges strongly aligned with modal wave refraction patterns planform emphasises importance delivery key driver through beachface accretion. The on this system, observed others world, requires further explanation. Although inferred, it may also be appropriate reopen debate sea-level change Tasmania.
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