Sediment loading on the Western Platform of the New Zealand continent: Implications for the strength of a continental margin

Physics

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Scientific paper

Mechanical properties of the New Zealand lithosphere are determined by forward modelling the gravity and isostatic response of a Plio-Pleistocene sediment loaded shelf margin. The Giant Foreset Formation on the Western Platform of New Zealand is a 2 km thick, 250 km long, and 100 km wide sediment package. Both the downward flexed Pliocene-Miocene boundary beneath the package and a 35-50 mGal peak-to-trough gravity anomaly over the sediment package are best matched with a flexural rigidity in the region of 5.6 × 1022-1.5 × 1023 N m (effective elastic thickness Te = 20-28 km). The Giant Foresets are a particularly important load to model because, unlike most sediment-loaded passive margins, there is a time gap of about 70-80 Ma between rifting and subsequent deposition of the sedimentary load. Furthermore, the width of the Giant Foreset load is sufficiently small to afford a reasonable resolution of Te.

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