An unusual magnetic Schist near the paradise scheelite lode, Glenorchy, New Zealand

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Abstract
Northerly trending, linear magnetic anomalies with amplitudes of up to 2000 nT and widths of a few metres near the Paradise scheelite lode are due to localised remanent magnetisation of the country rock (chlorite subzone 3 schist). The small amounts of magnetic material within the schist are charaderised by very high Koenigsberger ratios, Qn, reaching a maximum of 750. Drill cores obtained from the anomalies have Curie points in the range 250°C – 300°C and a magnetic concentrate consists chiefly of monoclinic pyrrhotite. Directions of magnetisation of the steeply dipping source rock are stable on both A.C. and thermal demagnetisation and appear ~o be parallel to the schistosity which, locally, is sub-horizontal. Further, thermal remagnetisation of the rock is oriented towards the plane of schistosity rather than in the direction of the ambient magnetic field.

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