Subseafloor mineralisation in rocks of the Matakaoa Volcanics around Lottin Point, East Cape, New Zealand
- 1 July 1980
- journal article
- research article
- Published by Taylor & Francis in New Zealand Journal of Geology and Geophysics
- Vol. 23 (3), 313-334
- https://doi.org/10.1080/00288306.1980.10424142
Abstract
Matakaoa Volcanics include basalts, dolerite, gabbro, and minor undersaturated alkaline plutonics; sedimentary bands or lenses are intercalated within the igneous rocks. Mineralisation occurs at 4 localities in the Lottin Point area, always associated with sediments, and distributed along eastnortheast trends. The mineral associations are manganese oxides, pyrite-sphalerite-galena-chalcopyrite with traces of gold and silver in barite gangue, andpyrite-chalcopyrite. The mineralisation is the result of exhalative precipitates from submarine hot springs, in places accompanied by biological activity and deposited with sediments between lava flows in a subseafloor environment. The economic potential is insignificant because of very limited strike extent.Keywords
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