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Mantle flow tilts Australia's last-interglacial shores
Great Barrier Reef Last Interglacial corals sit metres below onshore beaches because the continent rose and the shelf sank, not because reefs weighed the crust down.
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Where are Last Interglacial reefs typically found under GBR flats?
In cores, between 5 and 20 m depth.
Source: Influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on sea-level records in Northeastern Australia · DOI · quote verified
How high are onshore LIG strandplains relative to modern sea level?
Ridge/swale heights from +3 to +9 m.
Source: Influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on sea-level records in Northeastern Australia · DOI · quote verified
What maximum RSL change does 1 km reef-isostasy modelling give since the LIG?
0.34 m.
Source: Influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on sea-level records in Northeastern Australia · DOI · quote verified
What maximum RSL change does the coarse reef-load model give?
1.45 m, because it overstates reef mass by ignoring fractional coverage.
Source: Influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on sea-level records in Northeastern Australia · DOI · quote verified
Did swapping Earth model VM2 matter much?
No: predicted RSL changed by at most 3% at indicator sites.
Source: Influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on sea-level records in Northeastern Australia · DOI · quote verified
What elevation change does dynamic topography predict since 127 ka?
About −10 to +10 m, enough to uplift the continent and subside the shelf.
Source: Influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on sea-level records in Northeastern Australia · DOI · quote verified
How might the Australian continent versus shelf have moved?
Continent uplifted up to 10 m; offshore shelf subsided 5 to 10 m since the LIG.
Source: Influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on sea-level records in Northeastern Australia · DOI · quote verified
Why is 1D coarse modelling a poor substitute for 3D 1 km reef loads?
Magnitude can be similar (~0.4 m) but the spatial pattern along the southern GBR coast is missed.
Source: Influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on sea-level records in Northeastern Australia · DOI · quote verified
What do the authors conclude about reef isostasy’s role?
It is negligible, reaching maximum values of 0.34 m.
Source: Influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on sea-level records in Northeastern Australia · DOI · quote verified
Must dynamic topography be considered at passive margins for MIS 5e reconstructions?
Yes: it can dominate LIG indicator displacement even without plate-boundary tectonics.
Source: Influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on sea-level records in Northeastern Australia · DOI · quote verified
What paleo RSL does one Queensland strandplain imply using standard indicative meaning?
3.4 ± 2.7 m.
Source: Influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on sea-level records in Northeastern Australia · DOI · quote verified