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Volume 82, 1954-55
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Postscript.

Since this paper went to the press, an example of the North Range rocks termed “tuffaceous greywacke” on pp. 83, 85 (e.g., 8932) has been figured by Williams, H., Turner, F. J., and Gilbert, C. M. (1954) in their new book Petrography, as fig. 99c, p. 303, under the classification of “volcanic greywacke”. Except in those cases where a contemporaneous pyroclastic admixture can be proved, as for example by the presence of glass shards, this name is to be preferred to the term “tuffaceous greywacke” as used on the above mentioned pages. Some of the Upper Triassic sediments such as 8952, p. 90, can also be classified appropriately as volcanic greywackes.

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Table VI.
Spectrographic Analyses
(All figures refer to parts per million. Analyses by Dr. S. R. Nockolds.)
Ionic Radius Limit of Sensitivity 8871 8873 8932 8776 8768 8791 8800 8859 8829 8819 8817
Ga 0.62 Å 5 20 20 20 15 10 8 20 15 10 X 5 Ga
Ci 0.64 1 30 25 80 X 7 8 10 3 n.d. tr.? n.d. Cr
V 0.65 10 100 125 250 X 20 20 35 20 n.d. 20 n.d. V
Li 0.78 1 60 55 35 25 45 20 30 30 30 60 80 Li
Ni 0.78 2 10 10 30 X X X X X n.d. X n.d. Ni
Co 0.82 5 20 15 30 X X X X X n.d. X n.d. Co
Sc 0.83 10 20 X 25 X 10 X 20 X n.d. X n.d. Sc
Zr 0.89 10 165 100 200 150 175 160 275 150 n.d. 175 n.d. Zr
Cu 0.83 5 25 40 25 X 10 5 10 15 n.d. 10 n.d. Cu
Y 1.06 15 30 30 40 X 35 35 45 35 n.d. 30 n.d. Y
Sr 1.27 10 2,000 50 200 3,500 5,000 40 100 10 20 25 15 Sr
Pb 1.32 15 tr. X X X 15 20 25 20 10 10 10 Pb
Ba 1.43 10 500 40 200 3,000 2,000 10 1.000 200 250 4,000 1,500 Ba
Rb 1.49 5 300 15 50 50 200 X 200 10 10 300 200 Rb

Be (10), Mo (5), Sn (15), In (1), La (40), Ag (1) and Tl (2) were not detected (approximate limits of sensitivity in brackets).

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Table VII.
Important Atom Ratios.
8871 8873 8932 8776 8768 8791 8800 8859 8829 8819 8817
Ba/K .006 .0015 .004 .04 .02 .0001 .007 .005 .006 .02 .01
Ba/Ca .005 .0004 .002 .04 .03 .00007 .01 .004 .02 .7 .1
Sr/K .04 .003 .007 .07 .08 .0008 .001 .0004 .0008 .0002 .0002
Sr/Ca .03 .0008 .001 .08 .1 .0005 .002 .0003 .0025 .006 .001
Ba/Sr .2 .5 .6 .5 .3 .2 7 15 9 100 70
Rb/K .006 .001 .002 .001 .003 — .0025 .004 .004 .003 .0025

Note.—For descriptions of specimens see opposite.

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Table VIII
Chemical Analyses of Taringatura Rocks (Analyst D. S. Combs)
8871 8873 8932 8776 8768 8791 8800 8859 8829 8819 8817 8818 9108 9051
SiO2 57.13 56.56 55.75 62.91 65.59 60.90 64.71 73.96 78.07 77.82 80.46
TiO2 1.27 1.52 1.34 0.37 0.38 0.21 0.41 0.24 0.13 0.17 0.13
Al2O3 16.03 15.24 16.16 13.85 13.76 16.30 15.22 12.99 11.68 10.03 8.89
Fe2O3 3.17 3.28 1.25 1.01 1.05 2.18 2.85 1.95 1.36 1.60 1.63
FeO 5.35 5.46 7.34 2.28 2.43 0.55 1.00 0.49 0.30 0.63 0.46
MnO 0.10 0.12 0.12 0.08 0.04 0.03 0.02 tr. tr. 0.02 0.01
MgO 2.51 2.60 3.87 1.42 1.18 0.28 0.82 0.40 0.04 0.40 0.39
CaO 4.00 3.77 3.50 3.19 3.13 5.45 3.01 1.97 0.44 0.25 0.64
Na2O 3.17 5.38 4.39 1.24 1.76 0.42 2.45 5.42 4.89 0.85 1.21 1.41 5.10 6.13
K2O 2.79 0.92 1.59 2.71 3.25 2.54 4.46 1.33 1.31 6.54 4.59 10.47 1.54 1.04
H2O+ 3.27 2.54 3.51 7.80 5.37 8.22 4.01 1.06 1.07 1.03 0.98
H2O- 0.78 0.75 0.72 2.81 1.68 2.70 0.92 0.28 0.27 0.32 0.32
P2O5 0.23 0.22 0.30 0.12 0.07 0.05 tr. tr. tr. tr. 0.02
CO2 0.09 1.37 0.44 nt.fd. 0.05 nt.fd. nt.fd. nt.fd. nil nil nil
BaO* 0.06 0.00 0.02 0.34 022 0.00 0.11 0.02 0.03 0.45 0.17
Total 99.95 99.73 100.30 100.13 99.96 99.83 99.99 100.11 99.59 100.11 99.90
Sp. Gr. 2.70 2.74 2.74 2.40 2.49 2.38 2.55 2.66 2.61 2.61 2.59
8871. Andesine-bearing augite-andesite tuff with a little healandite after glass. Bed NR1, North Range, Taringatura Survey District, Southland.
8873. Albitized, meta-andesite lithic tuff. Bed NR1.
8932. Albitic tuffaceous greywacke. Bed NR5.
8776. Fine-grained, heulanditized vitric tuff. Bed NR7.
8768. Coarse-grained, heulanditized vitric-crystal tuff. Bed NR2.
8791. Fine-grained laumontitized vitric tuff. Bed NR5.
8800. Coarse-grained laumontitized vitric-Crystal tuff, with a small amount of secondary quartz and feldspars. Bed NR2.
8859. Quartz-albite-adularia-pumpellyite metasomatite, albite-rich phase. Bed NR2.
8829. Ditto. Albite-rich phase. Bed NR2.
8819. Ditto. Adularia-rich phase. Bed NR2.
8817. Ditto. Adularia-rich phase. Bed NR2.
8818. Ditto. Concentration of adularia-rich lapilli.
9108. Analcime-rich tuffaceous greywacke, Kaihiku Gorge, Southland.
9051. Analcime-rich impure crystal-vitric tuff (Otamitan), Wether Hill, Taringatura.

[Footnote] * Spectrographic determinations by Dr. Nockolds.

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Table IX.
Norms, Weight Per Cent.
8871 8873 8932 8776 8768 8791 8800 8859 8829 8819 8817
Q 14.0 11.8 8.0 35.0 33.2 36.7 25.6 33.0 43.5 46.3 53.7
C 1.3 2.2 2.5 3.1 1.7 3.2 0.8 — 1.4 0.7 0.6
Or 16.6 5.5 9.4 16.1 19.3 15.1 26.4 7.9 7.8 38.8 27.2
Ce 0.1 — 0.1 0.8 0.5 — 0.2 0.1 0.1 1.0 0.4
Ab 26.5 45.6 37.2 10.5 14.9 3.6 20.6 46.0 41.4 7.2 10.3
An 17.9 8.6 12.7 15.1 14.8 26.7 14.9 7.1 2.2 1.2 3.2
Wo — — — — — — — 1.0 .— — —
Di En — — — — — — — 1.0 — — —
Hy En 6.3 6.5 9.7 3.5 2.9 0.7 2.2 0.0 0.1 1.0 1.0
Fs 5.3 5.0 10.5 2.9 3.1 — — — — — —
Mt 4.6 4.7 1.8 1.5 1.5 1.3 2.1 0.9 0.6 2.0 1.1
H — — — — — 1.3 1.4 1.3 0.9 0.2 08
Il 2.4 2.9 2.5 0.7 0.7 0.4 0.8 0.5 0.2 0.3 0.2
Ap 0.5 0.5 0.7 0.3 0.2 0.1 — — — — 0.1
Cc 0.2 3.1 1.00 — 0.1 — — — — — —
4.1 3.3 4.2 10.6 7.0 10.9 4.9 1.3 1.3 1.4 1.3
H2O± 99.8 99.7 100.3 100.1 99.9 100.0 99.9 100.1 99.5 100.1 99.9
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