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|a New evidence for episodic post-glacial sea-level rise, central Great Barrier Reef, Australia |h [electronic resource] |y English. |
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|a [S.l.] : |b Elsevier, |c 1995. |
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|a Marine Geology Volume 127 |y English. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a We present an extensive database of 364 radiocarbon dates from coastal and marine sediments of the central Great
Barrier Reef (GBR) shelf, of which 110 are previously unpublished. The elevation data have been reduced to a
common datum (Australian Height Datum, AHD) and the various sources of error have been assessed. Using modem
lithological and biological relationships with sea level, the elements of the radiocarbon database have been converted
into sea-level indicators. The upper bound of the assembled dataset corresponds to a best-estimate sea-level curve,
and the full dataset provides a narrow envelope for sea-level rise on the GBR shelf for the last 11-12 kyr (not
including hydro-isostatic crustal flexing). The envelope is consistent with episodic rise in post-glacial sea levels.
The rising post-glacial sea level probably included stillstands (or minor falls), at ca. -45 m AHD (at ca. 10.5
kyr B.P.), -5 m (7.8 kyr B.P.), -2 m (ca. 6 kyr B.P.) and + 1.7 m (5.5 kyr B.P.). There is evidence for a significant
fall in sea level between stillstands at - 11 m (8.5 kyr B.P.) and - 17 m (8.2 kyr B.P.). Stillstand durations apparently
ranged between ~200 years and ca. 1800 years. Rates of sea-level change varied between a fall of 20 mm/yr
(20 m/kyr, pre-8.2 kyr B.P.) and a rise of 30 mm/yr (30 m/kyr, post-g.2 kyr B.P.).
The vertical spread in the derived sea-level data is very wide. The use of shell material for dating seems unreliable
and prone to large and unpredictable errors. Data from bulk mangrove muds appear reliable for determination of
ancient sea level, but may at times result in sea level being placed up to 4 m below the true level. In-situ biogenic
carbonates such as preserved oyster beds and coral micro-atolls are the most reliable indicators of sea-level position,
while deposits of mangrove mud give a useful first-order approximation of ancient sea levels. Caution should be used
in drawing ‘sea-level curves’ from few data points.
We conclude that the post-11-12 kyr B.P. relative rise in sea level was episodic on the central GBR continental
margin. More data are required to define clearly sea-level change up to ca. -20 m at 9 kyr B.P. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a Great Barrier Reef (Qld.). |
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|t New evidence for episodic post-glacial sea-level rise, central Great Barrier Reef, Australia |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15061895/00001 |y Click here for full text |
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|3 Host material |u http://www.sciencedirect.com/science/article/pii/0025322795000598 |y New evidence for episodic post-glacial sea-level rise, central Great Barrier Reef, Australia |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/18/95/00001/Larcombe et al_1995_New evidence for episodic post-glacial sea-level rise, central Great Barrierthm. |
