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Geological map of New Zealand 1:1 000 000 : digital vector data 2014

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    Edbrooke, S.W.; Heron, D.W.; Forsyth, P.J.; Jongens, R. (compilers) 2014 Geological map of New Zealand 1:1 000 000 : digital vector data 2014. Lower Hutt, NZ: GNS Science. GNS Science geological map 2 1 DVD-ROM

    Abstract: The new Geological Map of New Zealand 1:1 000 000 (1:1M GMNZ) has been compiled to reflect the improved knowledge of New Zealand geology brought about by the recently completed (2011), second edition 1:250 000 Geological Map of New Zealand series, named “QMAP” (for “Quarter-million MAP). This 1:1M GMNZ map presents a simplified summary of QMAP information, with minor differences where more recent data has become available. The 1:1 000 000 map includes geology of the Kermadec, Bounty, Snares, Antipodes, Auckland and Campbell islands, that were not included in the QMAP coverage, and these islands were compiled from the best available data, including recent unpublished mapping. The process of compiling the map has involved simplification of QMAP data by selective amalgamation of geological units, smoothing of complicated boundaries and removal of small or very thin polygons, as appropriate for presentation at the smaller scale. New attribute data were generated to geologically describe the geological features that the redrawn polygons and lines represent. The generalised 1:1 000 000 scale has dictated a chronostratigraphic emphasis where geological units are primarily distinguished by age of deposition or emplacement, using international time scale units. Sedimentary units are differentiated and coloured according to their depositional age, with overprints used to distinguish non-marine and coastal sediments. Late Cretaceous and younger intrusive and volcanic rock units, including widespread ignimbrite deposits in the North Island, are coloured shades of red to pink rather than the colours assigned to sedimentary units of comparable ages. Metamorphic rock units are portrayed according to their known or inferred protolith age; Haast Schist rocks have overprints differentiating textural metamorphic grade. Major allochthonous units (Northland and East Coast allochthons) are distinguished by having a diagonal white stripe overprint on the underlying protolith body colour. Where deformation has sufficiently disassociated and mixed protoliths, the allochthon “matrix” is coloured grey, rather than by emplacement age. Basement sedimentary rocks are portrayed according to age and tectonostratigraphic terrane affinity. As was the general rule for QMAP, the uppermost deposit or rock unit more than about 5 m thick has been depicted and thinner veneers of soils, tephra, loess and scree are commonly omitted. Geological units are represented as polygons with associated attributes that include stratigraphic affiliation, rock type and deposition or emplacement age. Faults are mapped, including most of the known active faults, but out of necessity there has been significant “thinning” where there are dense clusters of faults in the QMAP dataset. Most QMAP concealed and inferred faults are not mapped. Faults are represented by line features with attributes describing accuracy, type, orientation, name and age, magnitude and sense of movement. (auth)

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