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File:The geology of the Dun Mountain subdivision, Nelson (1911) (14782020345).jpg

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Identifier: geologyofdunmoun00bell (find matches)
Title: The geology of the Dun Mountain subdivision, Nelson
Year: 1911 (1910s)
Authors: Bell, James Mackintosh, 1877-1934 Clarke, E. de C. (Edward de Courcy), 1880-1946 Marshall, P. (Patrick), 1869-1950 New Zealand. Geological Survey Branch
Subjects: Geology
Publisher: Wellington, (N. Z.) : by authority John Mackay, Govt. Printer
Contributing Library: University of Connecticut Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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tion along the base of the Richmond and Hes-lington hills to the south-western corner of the subdivision. Except for the break intheir continuity, which is due to the intrusion of the rocks of the Mineral Belt, theMaitai rocks extend from their western boundary to the eastern limit of the subdivision. Structure.Folding.—The Maitai rocks are nearly everywhere highly inclined, and bent intoa series of sharp folds. The dip is usually at a high angle, and is sometimes vertical,more particularly in the neighbourhood of anticlinal axes. In general the strike variesbetween N. 25° E. and N. 60° E. The strike bends somewhat round the margin of the Mineral Belt in the Tee and Serpentine valleys, and also shows some variationsnear the axes of anticlines and svnclines. but these variations affect onlv a small thick- ! The Brook Street igneous rocks, which are further discussed in Chapter III. 2b accompany Bullatrrv Wf2. DintMoittiiajr, Subdivision, Motupr.Ao Div is ioJt, Nelson Land, District
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Bf Authority : Jthn Maofcuy, Qovtmmtnt Prlntrr. 15 ness of rocks. The anticlines and synclines arc extremely sharp, and along tlieir axesthe rocks are slightly shattered and penetrated by veins of quartz, which have re-cemented them. In two cases the anticlines were observed to pitch to the north-east atangles of 1U° to 20°. Five anticlines and six synclines are seen in section between themouth of the Wairoa Gorge and the Mineral Belt of the Lee Valley. The observations made by the writers seem to show that the rocks of the MaitaiSeiies in the Dun .Mountain Subdivision hare been folded into an anticlinorium, mainlyoccupied now by the intrusions of the Mineral Belt, and into a synclinorium lyingto the west of the anticlinorium. In that part of the subdivision lying north andnorth-north-east of Brook Street valley the synclinorium is thrown into about five minoranticlines and five minor synclines. In the Pelorus River and in the tributaries enter-ing on its left bank the dip is, with

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Bell, James Mackintosh, 1877-1934; Clarke, E. de C. (Edward de Courcy), 1880-1946; Marshall, P. (Patrick), 1869-1950;

New Zealand. Geological Survey Branch
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