Abstract
Abstract Broad chemical characteristics of sedimentary rocks from the Buller and Takaka Terranes have been examined, and provenance and tectonic setting inferred, using whole‐rock major and trace element data from 208 samples. Buller Terrane rocks west of the Karamea Batholith (Greenland Group) have chemistry typical of turbidite sediments deposited at a weathered passive continental margin. Bulk chemical characteristics confirm earlier work, except that a small spatial chemical variation is seen, consistent with the presence of a small volcanogenic component in the south, decreasing to the north. East of the batholith, compositions of the Webb and Roaring Lion Formations overlap with those of the western Buller rocks, supporting equivalence (at least in part) with the Greenland Group. Passive margin chemical characteristics are maintained throughout the succeeding Ordovician formations. Within the Takaka Terrane there are sharp contrasts in chemistry between the Cambrian and post‐Cambrian (Ordovician—Sil...
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