Paint it all blue? Sub-division of the Torlesse Terrane for QMap : Workshop on Torlesse mapping and sub-division, 26-29 November 1998, Lake Ohau

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Cox, S.C.; Begg, J.G. 1999 Paint it all blue? Sub-division of the Torlesse Terrane for QMap : Workshop on Torlesse mapping and sub-division, 26-29 November 1998, Lake Ohau. Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 99/05 20 p.

Abstract: A workshop was organised by the Institute of Geological & Nuclear Sciences (GNS) to examine subdivision of the Torlesse greywackes, in order to review their representation in geological literature and on maps, and in particular the 1:250,000 mapping programme (QMAP). The meeting was in direct response to a 1997 Foundation of Research, Science and Technology (FRST) review that highlighted a need to examine issues of tactical relevance and appropriateness of data collection in geologically ''monotonous'' regions. GNS invited a panel of sixteen geologists on the basis of their relative specialities, parent organisation and past research experience. Prior to the workshop users of geological information in areas underlain by Torlesse rocks were canvassed as to their current and perceived needs. These included the traditional earth science/academic users as well as an emerging sector from land use planning/regional and territorial authorities. The workshop was held at Lake Ohau Lodge in perfect weather from Nov 26-29th 1998. It examined types of information end-users require, parameters that can be measured, and scales at which the parameters typically vary. A review of previously published geological maps highlighted key issues of cartography and map design, and steered participants towards a consensus as to future directions. Participants spent a day in the field, working in teams of diverse speciality to test the practicality of suggestions made indoors. The greatest earth-science requirements appear to be a need to be able to place individual localities in a wider context and depict the large scale distribution of structurally coherent blocks in the central South Island. This can most easily be achieved by outlining major lithostratigraphic units and form lines. Scientific benefits were also thought to arise from displaying the spatial variation of ''oddities'' (such as fossil localities, chert, red mudstone, limestone) on regional maps, even if their scale becomes exaggerated. Many end-users require detailed information on Quaternary features, many of which are not appropriate at 1:250,000 scale, but could be recorded on data record sheets or in the QMAP GIS. The principal outcomes from the workshop are: (1) lively discussions amongst scientists from a diverse range of specialities focussed on a similar topic; (2) a set of recommendations as to what should be recorded and shown by GNS's 1:250,000 mapping programme. (auth)