Heavy minerals from Cretaceous and Tertiary sandstones, Waipara and Oxford, North Canterbury

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Smale, D. 1983 Heavy minerals from Cretaceous and Tertiary sandstones, Waipara and Oxford, North Canterbury. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report SL 5 15 p.

Abstract: Heavy minerals from North Canterbury Cretaceous and Tertiary sandstones from near Whitecliffs, Oxford, and the Waipara River, are consistent with derivation from a provenance similar to the Torlesse rocks now exposed nearby. The samples from two clusters, one of Cretaceous-Paleocene age in which zircon, garnet, and apatite are prominent, and a younger one with more epidote, clinozoisite, and semi-opaque debris. Samples from the Torlesse show two similar clusters, suggesting that the younger rocks were derived directly first from one group and then from the other. Clustering in the Oxford area suggests a slightly greater contribution of volcanic debris at the time of deposition of the Oxford Chalk.