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- W1994960410 abstract "Motukokako, 1 km northeast of Cape Brett, Northland, New Zealand, is composed of Waipapa “basement” greywacke and argillite of Permian-Jurassic age, unconformably overlain by moderately dipping (?)01igocene Whangarei Limestone. The nearest Whangarei Limestone onshore is 37 km to the southwest, at Kawakawa. Both the Waipapa rocks and Whangarei Limestone are cut by a series of subvertical Zn-Pb-Cu mineralised quartz veins. At the northern end of Motukokako, the Whangarei Limestone is altered to Zn-Pb mineralised calc-silicate skarns, formed by metasomatic reaction between the limestone and the hydrothermal fluids which penetrated along fractures that were later filled by the quartz veins. Prograde hedenbergite-garnet-epidote-axinite skam is the dominant type; it is cut and replaced by retrograde ilvaite-babingtonite skarn, mainly along subvertical zones adjacent to the quartz veins. Sphalerite and galena are disseminated in the hedenbergite-garnet-epidote skarn, and also in the adjacent silicified recrystallised limestone. The mineralisation is generally low grade (1–6% Zn and 0.2–1%Pb). Some of the zinc is contained in axinite and in sauconite, a Zn-rich smectite. Hedenbergite, axinite, ilvaite and babingtonite are notably enriched in Mn, while epidote and garnet (andradite) are Fe-rich varieties. No igneous rocks are known in the vicinity; the most likely source for the hydrothermal fluids that produced the skarn is an Early Miocene quartz diorite-granodiorite stock at depth, similar to those now exposed at Cape Karikari and Coppermine Island." @default.
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- W1994960410 date "1990-12-01" @default.
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- W1994960410 title "Tertiary limestone and Zn-Pb mineralised skarn at Motukokako, Cape Brett, northern New Zealand" @default.
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- W1994960410 doi "https://doi.org/10.1080/03036758.1990.10426721" @default.
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