Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-23T16:16:27.219Z Has data issue: false hasContentIssue false
  • English
  • Français

Ultramafic nodules and their host rocks from Auckland, New Zealand

Published online by Cambridge University Press:  01 May 2009

K. A. Rodgers ,
R. N. Brothers  and
E. J. Searle
K. A. Rodgers
Affiliation:
Department of GeologyUniversity of AucklandPrivate BagAuckland 1New Zealand
R. N. Brothers
Affiliation:
Department of GeologyUniversity of AucklandPrivate BagAuckland 1New Zealand
E. J. Searle
Affiliation:
Department of GeologyUniversity of AucklandPrivate BagAuckland 1New Zealand
Get access Rights & Permissions [Opens in a new window]

Summary

Ultramafic and mafic nodules are abundant inclusions in Cainozoic alkali basalts at 7 localities in the Auckland Province. Nodule types show a gradation from dunites and pyroxenites through periodotites to eucrites. Bulk chemical variations in the nodules show a wide range in MgO/ΣFeO with a tendency for Al2O3, ΣFeO, CaO and Na2O + K2O to increase as this ratio decreases. These chemical trends, together with published data on the nodules mineralogy and fabric, are consistent with their being interpreted as fragments of the upper mantle.

Type
Articles
Information
Geological Magazine , Volume 112 , Issue 2 , March 1975 , pp. 163 - 174
Copyright
Copyright © Cambridge University Press 1975

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Black, P. M. & Brothers, R. N. 1965. Olivine nodules in olivine nephelinite from Tokatoka, Northland. N.Z. Jl Geol. Geophys. 8, 62–80.CrossRefGoogle Scholar
Brothers, R. N. 1960. Olivine nodules from New Zealand. Rep. 21st Internat. geol. Congress, Copenhagen 13, 68–81.Google Scholar
Brothers, R. N. & Rodgers, K. A. 1969. Petrofabric studies of ultramafic nodules from Auckand, New Zealand. J. Geol. 77, 452–65.Google Scholar
Chayes, F. 1964. A petrographic distinction between Cenozoic volcanics in and around the open oceans. J. geophys. Res. 69, 1573–88.CrossRefGoogle Scholar
Davies, H. L. 1968. Papuan ultramafic belt. Rep. 23rd Internat. geol. Congress, Prague 1, 209–20.Google Scholar
Davies, H. L. 1970. Peridotite–gabbro–basalt complex in eastern Papua. Bull. Bur. Miner. Resour. Geol. Geophys. Aust. 128.Google Scholar
Dickey, J. S. 1970. Partial fusion products in alpine-type peridotites. Spec. Pap. Mineralog. Soc. Am. 3, 33–49.Google Scholar
Forbes, R.B. & Kuno, H. 1967. Peridotite inclusions and basaltic host rocks, pp. 328–36. In Wyllie, P. J. (Ed.): Ultramafic and Related Rocks. Wiley, New York.Google Scholar
Guillon, J.-H. 1969. Données nouvelles sur la composition et la structure du Grand Massif péridotitique du Sud de la Nouvelle Calédonie. Cah. ORSTOM(Sér. Géol.) 1, 7–26.Google Scholar
Harris, P. G., Hutchison, R. & Paul, D. K. 1972. Plutonic xenoliths and their relation to the upper mantle. Phil Trans. R. Soc. Lond. A 271, 313–23.Google Scholar
Hutchison, R. 1970. Ultramafic xenoliths and composition of the upper mantle. J. Earth Sci. Leeds 8, 31–9.Google Scholar
Hutchison, R., Paul, D. K. & Harris, P. G. 1970. Chemical composition of the upper mantle. Mineralog. Mag. 37, 726–29.CrossRefGoogle Scholar
Kear, D. 1961. Stratigraphy of Pokeno District, Auckland. N.Z. Jl Geol. Geophys. 4, 148–64.CrossRefGoogle Scholar
Kuno, H. & Aoki, K.-I. 1970. Chemistry of ultramafic nodules and their bearing on the origin of basaltic magmas. Phys. Earth Planet. Interiors 3, 273–301.Google Scholar
Leggo, P. J. & Hutchison, R. 1968. A Rb–Sr isotope study of ultrabasic xenoliths and their basaltic host rocks from the Massif Central, France. Earth Planet. Sci. Lett. 5, 71–5.CrossRefGoogle Scholar
O'Brien, J. P. & Rodgers, K. A. 1973(a). Alpine-type peridotites from the Auckland Province. I. The Wairere Serpentinite. Jl R. Soc. N.Z. 3, 169–90.CrossRefGoogle Scholar
O'Brien, J. P. & Rodgers, K. A. 1973(b). Alpine-type peridotites from the Auckland Province. II. The North Auckland Serpentinites. Jl R. Soc. N.Z. 3, 263–80.CrossRefGoogle Scholar
O'Brien, J. P. & Rodgers, K. A. 1974. Alpine-type peridotites from the Auckland Province. III. Petrography, mineralogy, chemistry and petrogenesis. Jl R. Soc. N.Z. 4, 141–60.Google Scholar
Rodgers, K. A. 1973. Chrome-spinels from the Massif du Sud, New Caledonia. Mineralog. Mag. 39, 326–39.Google Scholar
Rodgers, K. A. & Brothers, R. N. 1969. Olivine, pyroxene, feldspar and spinel in ultramafic nodules from Auckland, New Zealand. Mineralog. Mag. 37, 375–90.Google Scholar
Rodgers, K. A., Spratt, P. R. & Grant-Mackie, J. A. 1973. A reappraisal of the Ngatutura Basalts and the Plio-Pleistocene boundary in south-west Auckland, New Zealand. N.Z. Jl Geol. Geophys. 16, 367–73.CrossRefGoogle Scholar
Roedder, E. 1965. Liquid CO2 inclusions in olivine-bearing nodules and phenocrysts from basalts. Am. Miner. 50, 1746–82.Google Scholar
Schofield, J. C. 1958. Notes on volcanism and structure in Franklin county. N.Z. Jl Geol. Geophys. 1, 541–59.CrossRefGoogle Scholar
Searle, E. J. 1960. Petrochemistry of the Auckland basalts. N.Z. Jl Geol. Geophys, 3, 23–40.Google Scholar
Searle, E. J. 1961. Petrology of the Auckland basalts. N.Z. Jl Geol. Geophys. 4, 165–204.Google Scholar
Shrewsbury, H. 1891. The Auckland volcanoes. Trans. Proc. N.Z. Inst. 24, 366–80.Google Scholar
Stueber, A. M. & Murthy, V. 1966. Strontium isotope and alkali element abundances in ultramafic rocks. Geochim. cosmochim. Acta 30, 1243–59.Google Scholar
Talbot, J. L., Hobbs, B. E., Wilshire, H. G. & Sweatman, T. R. 1963. Xenoliths and xenocrysts from lavas of the Kerguelen Archipelago. Am. Miner, 48, 159–79.Google Scholar
Turner, F. J. 1942. Preferred orientation of olivine crystals in peridotites with special reference to New Zealand examples. Trans. Proc. R. Soc. N.Z. 72, 280–300.Google Scholar
Voll, G. 1960. New work on petrofabrics. Lpool Mnchr geol. J. 2, 503–67.Google Scholar
Wilshire, H. G. & Binns, R. A. 1961. Basic and ultrabasic xenoliths from volcanic rocks of New South Wales. J. Petrology 2, 185–208.CrossRefGoogle Scholar