Abstract
Abstract Shallow‐marine, mixed temperate, terrigenous‐carbonate sediments are accumulating on the shallow to deep Wanganui shelf (c. 20–110 m water depth). From cluster analysis of textural and compositional parameters, five surficial sediment facies and five subfacies have been defined for the shelf. Facies 1 (Bivalve‐bearing [gravelly] sand), is a terrigenous‐dominated, shallow shelf facies ( 50% CaCO3, and occurs in the shallow to mid shelf region (c. 30–90 m) where levels of terrigenous input are reduced, and substrates and hydraulic conditions are favourable for carbonate production. Facies 2 comprises Subfacies 2a (Bivalve‐dominated sandy gravel), 2b (Bryozoan/bivalve‐dominated sandy gravel), and 2c (Bryozoan/bivalve‐dominated muddy sandy gravel and ...
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