New Zealand Journal of Geology and Geophysics abstracts

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Mafic/ultramafic clasts in deformed biotite zone metaconglomerate, Macraes mine, Haast Schist, New Zealand

D.CRAW

Geology Department
University of Otago
P.O. Box 56 Dunedin, New Zealand

P. V. ANGUS

Macraes Mining Company Limited
P.O. Box 84
Palmerston
Otago, New Zealand

Abstract A textural zone 4, biotite zone metaconglomerate cropped out temporarily in metamorphosed Torlesse Terrane rocks at the Macraes gold mine, eastern Otago. This is the highest textural and metamorphic grade at which a metaconglomerate has been recognisable in the Haast Schist. Clasts in the metaconglomerate are largely reconstituted, boudinaged, locally transposed, and are cut by quartz veins. Fuchsite (5% Cr₂O₃), talc, and feldspathic clasts are recognisable as distinct from enclosing schist. The feldspathic clasts may have been intermediate or mafic plutonic rocks, and the talc and fuchsite clasts may have had ultramafic parents. The clasts suggest that a minor mafic/ultramafic element existed in the largely continental source area of the Torlesse Terrane.

Keywords Otago Schist; conglomerate; Torlesse Terrane; ultramafic; fuchsite

Received 15 January 1993; published 14 September 1993
New Zealand Journal of Geology & Geophysics, 1991, Vol. 36: 395—397
0028Ð8306/06/3603—0395 ©The Royal Society of New Zealand 1991

PDF file of entire paper: medium quality (1107K); (scanned from paper original: notes about this process). Digitisation of this article from the printed journal was kindly facilitated by the Geological Society of New Zealand

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