Constraints on the amplitude of Mid-Pliocene (3.6-2.4Ma) eustatic sea-level fluctuations from the New Zealand shallow-marine sediment record.

Abstract

Ice-volume calibrations of the deep-ocean foraminiferal delta18O record imply orbitally influenced sea-level fluctuations of up to 30m amplitude during the Mid-Pliocene, and up to 30 per cent loss of the present-day mass of the East Antarctic Ice Sheet (EAIS) assuming complete deglaciation of the West Antarctic Ice Sheet (WAIS) and Greenland. These sea-level oscillations have driven recurrent transgressions and regressions across the world's continental shelves. Wanganui Basin, New Zealand, contains the most complete shallow-marine Late Neogene stratigraphic record in the form of a continuous cyclostratigraphy representing every 41 and 100ka sea-level cycle since ca 3.6Ma. This paper presents a synthesis of faunally derived palaeobathymetric data for shallow-marine sedimentary cycles corresponding to marine isotope stages M2-100 (ca 3.4-2.4Ma). Our approach estimates the eustatic sea-level contribution to the palaeobathymetry curve by placing constraints on total subsidence and decompacted sediment accumulation. The sea-level estimates are consistent with those from delta18O curves and numerical ice sheet models, and imply a significant sensitivity of the WAIS and the coastal margins of the EAIS to orbital oscillations in insolation during the Mid-Pliocene period of relative global warmth. Sea-level oscillations of 10-30m were paced by obliquity.

DOI: 10.1098/rsta.2008.0223
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@article{Naish2009ConstraintsOT, title={Constraints on the amplitude of Mid-Pliocene (3.6-2.4Ma) eustatic sea-level fluctuations from the New Zealand shallow-marine sediment record.}, author={Tim R. Naish and Gary S . Wilson}, journal={Philosophical transactions. Series A, Mathematical, physical, and engineering sciences}, year={2009}, volume={367 1886}, pages={169-87} }