Geology of the St Arnaud District, southeast Nelson (sheet N29)

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Johnston, M.R. 1990 Geology of the St Arnaud District, southeast Nelson (sheet N29). Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey bulletin 99. 119 p.

Abstract: The St Arnaud district, centered on Tophouse saddle in southeast Nelson, is bisected by the east northeast striking Alpine Fault. The southern ends of the east Nelson ranges, including Beebys Knob and Red Hills and the Moutere Depression are north of the fault. Here the indurated rocks are of late Paleozoic to Mesozoic age and are generally weak metamorphosed (zeolite and prehnite facies). However, locally lawsonite-chlorite-albite and pumpellyite-actinolite facies are present. The northern end of the Spenser Mountains and Raglan and Bounds ranges are south of the fault. Periods of deformation occurred in the Jurassic-Early Cretaceous (Rangitata Orogeny), Late Cretaceous and Late Cenozoic (Kaikoura Orogeny). As part of the latter, fault movement uplifted east Nelson and the area south of the Alpine Fault and is still continuing. (auths)

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