Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Geocheemical variations in a suite of granitoids and gabbros from Southland, New Zealand

  • 125 Accesses

  • 18 Citations

Abstract

The Longwoods Complex of Southland, New Zealand is part of an extensive terrane consisting of intrusives, volcanics, and sediments, which outcrops in the southern and north-western portions of the South Island. This terrane represents a volcanic arc which was active from Permian to Jurassic times (Grindley, 1958; Challis, 1968, 1969; Coombs et al., 1976). Between Pahia Point and Oraka Point on the southern coast of the South Island a section across the Longwoods Complex is well exposed and intrusives ranging in composition from ultrabasic cumulate rock, high-Al gabbro and gabbroic diorite to quartz diorite and granite outcrop. Two models have been considered for the origin of the rocks of the Pahia Point-Oraka Point section: (a) the rocks constitute one suite, the members of which are related by a crystal fractionation process; (b) the rocks constitute two suites which are not directly related.

The ultrabasic rocks, and quartz diorites are complementary and are derived from a high-Al gabbro parent by crystal fractionation involving pyroxene, olivine, plagioclase and hornblende, but considerations of viscosity and the geochemistry of the granite preclude derivation of the high-Si rocks by continuation of the crystal fractionation model. Furthermore, the quartz-diorites are of two types: xenolith bearing foliated quartz-diorites and xenolith deficient unfoliated types. The latter rock type appears to group with the gabbros on variation diagrams and partitioning of Ti between mica and amphibole supports the view that two distinct suites of rocks are involved: (a) a suite derived by fractional crystallization from a high-Al gabbro parent and consisting of cumulate ultramafic rocks, high-Al gabbro, gabbroic diorite and quartz-diorite; (b) a suite of foliated quartz diorites, formed by partial melting of lower crustal igneous rocks. The xenoliths in the foliated quartz-diorites represent modified residue left after partial melting. Melt and residue have unmixed to varying degrees during diapiric rise and a range of compositions has resulted.

The association of the two suites is tectonic. Gabbroic melts are generated in the lithosphere during plate subduction beneath a continental margin and rise of these melts into the lower continental crust results in partial melting and generation of quartz-diorite magmas.

This is a preview of subscription content, log in to check access.

References

  1. Aronson, J.L.: Regional geochronology of New Zealand: Geochim. Cosmochim. Acta 32, 669–697 (1968)

  2. Bowen, N.L., Tuttle, O.F.: Origin of granite in the light of experimental studies in the system NaAlSi3O8-KAlSi3O8-SiO2-H2O: Geol. Soc. Am. Mem. 74 (1958)

  3. Carmichael, I.S.E.: The petrology of Thingmuli, a Tertiary volcano in Eastern Iceland: J. Petrol. 5, 435–460 (1964)

  4. Challis, G.A.: The K2O-Na2O ratios of ancient volcanic arcs in New Zealand: N.Z. J. Geol. Geophys. 11, 200–211 (1968)

  5. Challis, G.A.: Discussion on the paper “The origin of ultramafic and ultrabasic rocks” by P.J. Wyllie: Tectonophysics. 7, 495–505 (1969)

  6. Cobbing, E.J., Pitcher, W.S.: The Coastal Batholith of Central Peru, J. Geol. Soc. London 128, 421–460 (1972)

  7. Compton, R.R.: Trondhjemite batholith near Bidwell Bar, California. Geol. Soc. Am. Bull. 66, 9–44 (1955)

  8. Coombs, D.S., Landis, C.A., Norris, R.J., Sinton, J.M., Borns, D.J., Craw, D.: The Dun mountain ophiolite belt, New Zealand, its tectonic setting, constitution, and origin, with special reference to the Southern portion: Am. J. Sci. 276, 561–603 (1976)

  9. Devereux, I., McDougall, I., Watters, W.A.: Potassium-argon mineral dates on intrusive rocks from the Foveaux Strait area: N.Z. J. Geol. Geophys. 11, 1230–1235 (1968)

  10. Erikson, E.H.: Petrology of the composite Snoqualmie batholith, central Cascades, Washington: Geol. Soc. Am. Bull. 80, 2213–2336 (1969)

  11. Erikson, E.H.: Petrology and petrogenesis of the Mount Stuart batholith — plutonic equivalent of the high-alumina basalt association: Contrib. Mineral. Petrol. 60, 183–207 (1977)

  12. Fyfe, W.A.: Some thoughts on granitic magmas. In: Mechanisms of Igneous Intrusion. (G. Newell and N. Rast, eds.), Geol. J. Spec. Iss. No. 2 (1970)

  13. Griffin, T.J., White, A.J.R., Chappell, B.W.: The Moruya Batholith and a comparison of the chemistry of the Moruya and Jindabyne Suites: J. Geol. Soc. Aust. (accepted for publication) (1978)

  14. Grindley, G.W.: The geology of the Eglinton Valley, Southland: New Zealand. Geol. Surv. Bull. 58, 68p. (1958)

  15. Higgins, M.W.: Petrology of Newberry volcano, Central Oregon: Geol. Soc. Am. Bull. 84, 455–488 (1973)

  16. Hietenan, A.: Metamorphic and igneous rocks of the Merrimac Area, Plumas National Forest, California. Geol. Soc. Am. Bull. 62, 565–608 (1951)

  17. Hine, R., Williams, I.S., Chappell, B.W., White, A.J.R.: Contrasts between I- and S-type granitoids of the Koscuisko Batholith, J. Geol. Soc. Aust. (accepted for publication) (1978)

  18. James, P.B.: Origin and emplacement of the ultramafic rocks of the Emigrant Gap area, California. J. Petrol. 12, 523–560 (1971)

  19. Kuno, H.: Origin of Cenozoic petrographic provinces of Japan and surrounding area: Bull. Volcanol. 20, 37–76 (1959)

  20. Kuno, H.: High-alumina basalt: J. Petrol. 1, 121–145 (1960)

  21. Kuno, H.: Lateral variation of basalt magma type across continental margins and island arcs: Bull. Volcanol. 29, 195–222 (1966)

  22. Landis, C.A., Coombs, D.S.: Metamorphic belts and orogenesis in Southern New Zealand: Tectonophysics 4, 501–518 (1967)

  23. Nockolds, S.R.: The Garabal Hill-Glen Fyne Igneous Complex: Quart. J. Geol. Soc. London 96, 451–511 (1941)

  24. Norrish, K., Chappell, B.W.: X-ray fluorescence spectrography. In: Physical Methods and Determinative Mineralogy, (J. Zussman, ed.), London: Academic Press 1967

  25. Norrish, K., Hutton, J.T.: An accurate X-ray spectrographic method for the analysis of a wide range of geological samples: Geochim. Cosmochim. Acta 33, 431–454 (1969)

  26. Osborn, E.F.: The complementariness of orogenic andesite and alpine peridotite: Geochim. Cosmochim. Acta 33, 307–324 (1969)

  27. Presnall, D.C., Bateman, P.C.: Fusion relations in the system NaAlSi3O8-CaAl2Si2O8-KAlSi3O8-SiO2-H2O and generation of granitic magmas in the Sierra Nevada Batholith. Geol. Soc. Am. Bull. 84, 3181–3202 (1973)

  28. Sinton, J.M.: Petrology of (alpine-type) periodotites from site 395, DSDP leg 45. Init. Rept. Deep Sea Drilling Project, Leg 45 (accepted for publication) (1977)

  29. Smith, A.L., Carmichael, I.S.E.: Quaternary lavas from the Southern Cascades, Western U.S.A.: Contrib. Mineral. Petrol. 19, 212–238 (1968)

  30. Waterhouse, J.B.: Permian stratigraphy and faunas of New Zealand: N.Z. Geol. Surv. Bull. 72 (1964)

  31. White, A.J.R., Chappell, B.W.: Ultrametamorphism and granite genesis: Tectonophysics 43, 7–22 (1977)

  32. Williams, J.G., Harper, C.T.: Age and status of the MacKay intrusives in the Eglinton-Upper Hollyfold Area. N.Z. J. Geol. Geophys. (accepted for publication) (1978)

  33. Wright, T.L., Doherty, P.C.: A linear programming and least squares computer method for solving petrologic mixing problems: Geol. Soc. Am. Bull. 81, 1995–2008 (1970)

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Price, R.C., Sinton, J.M. Geocheemical variations in a suite of granitoids and gabbros from Southland, New Zealand. Contr. Mineral. and Petrol. 67, 267–278 (1978). https://doi.org/10.1007/BF00381454

Download citation

Keywords

  • Olivine
  • Jurassic
  • Subduction
  • Partial Melting
  • Continental Crust