Revising the 1:250,000 Geological Map of New Zealand : a discussion paper

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Nathan, S. 1993 Revising the 1:250,000 Geological Map of New Zealand : a discussion paper. Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 93/26 26 p.


Abstract: The 1:250,000 Geological Map of New Zealand is the single most important synthesis and summary of New Zealand geology. The First Edition, completed in 1968, is out of date due to advances in knowledge and interpretation. It is proposed to devote the resources of the Regional Geology Programme over the next nine years to a revision and preparation of a second edition (QMAP). The last 25 years have been revolutionary in the Earth Sciences, especially with the development of new concepts based on plate tectonics, technology related to exploration of the earth, and computerised information management. Each of these issues has important implications for the QMAP Programme. In particular, the development of Geographic Information Systems (GIS) means that information with geographic attributes can be stored and manipulated in digital form, and up-to-date maps can be produced as needed. There is a continuing demand for a set of general purpose printed geological maps, but it is anticipated that the production of customised maps (of scale, area and topic requested by a particular client) will be increasingly important in the future. Development of a national mapping GIS will be given top priority. As the available resources for this programme are limited, it is proposed to adopt a problem-based approach, concentrating, new fieldwork and associated laboratory investigations mainly on the following topics: Northland Allochthon and parts of the East Coast region; Torlesse terrane (and possible sub-terranes); Plutonic rocks in NW Nelson, Fiordland, and Stewart Island. Several working groups are proposed to consider special topics, including map legends and geological symbols, mapping of faults and late Quaternary deformation, mapping of Quaternary units, and a general approach to metamorphic rocks. Comments on the QMAP proposal, both on the overall proposal and suggested operational matters, are sought from the Earth Science community and map users. (auth)