Petrology and provenance of Pleistocene deposits in the south Parengarenga‐Te Kao district, northern New Zealand

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Abstract
Pleistocene deposits in the south Parengarenga‐Te Kao area are predominantly medium to fine, highly mature sandstones. They are comprised of 90–96% quartz and subordinate feldspar and rock fragments. Mafic minerals generally comprise less than 1% of these rocks and are opaque dominated. An unusually high proportion of the monocrystalline quartz, possibly up to 40%, has been derived from an acid volcanic terrane, the most likely source being acid volcanic rocks in the Central Volcanic Plateau. The remaining quartz is multicycle and has been derived from older sedimentary terranes in the Northland and Auckland areas. The mineralogy of the modern Parengarenga Facies in Great Exhibition Bay is almost identical to that of the Pleistocene sandstones from which they were probably derived.

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