Hostname: page-component-cd9895bd7-7cvxr Total loading time: 0 Render date: 2024-12-27T10:41:40.741Z Has data issue: false hasContentIssue false
  • English
  • Français

Narsarsukite: a new occurrence in peralkaline trachyte, south Greenland

Published online by Cambridge University Press:  05 July 2018

B. G. J. Upton ,
R. Macdonald ,
P. G. Hill ,
B. Jefferies  and
C. E. Ford
B. G. J. Upton
Affiliation:
Department of Geology, Edinburgh, EH9 3JW
R. Macdonald
Affiliation:
Department of Environmental Sciences, Lancaster, LAI 4YR
P. G. Hill
Affiliation:
Department of Geology, Edinburgh, EH9 3JW
B. Jefferies
Affiliation:
Department of Geology, Edinburgh, EH9 3JW
C. E. Ford
Affiliation:
Department of Geology, Edinburgh, EH9 3JW
Get access Rights & Permissions [Opens in a new window]

Summary

A flinty, spherulitic dyke of peralkaiine trachyte in a Precambrian dyke-swarm consists mainly of albite and aegirine. Within this, euhedral crystals of narsarsukite, Na2(Ti,Fe)Si4O10(F), occur as short prisms elongate parallel to c. This distinguishes them from all previously described narsarsukites, which have tabular habits. Minor phases present include micas, apatite, quartz, pectolite, nordite, and a thorium silicate. Probe analyses are presented for narsarsukite, aegirine, aibite, biotite, apatite, pectolite, nordite, and the thorium silicate.

On mineralogical and geochemical grounds it is unlikely that the narsarsukite-bearing dyke is a differentiate of supposedly mantle-derived basalt-trachyte-comendite magmas in the region. The dyke is colinear with a comendite dyke exposed at lower altitude and it is suggested that the narsarsukite- bearing dyke developed as a rhcomorphic fenite generated by reaction between quartz diorite basement and fugitive alkaline solutions from the subjacent comendite.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 315 , September 1976 , pp. 737 - 746
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1976

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

Bakakin, (V. V.), Belov, (N. V.), and Soloyeva, (L. P.) , 1970. The crystal structure of nordite and its relationship to melilite and datolite—gadolinite. Amer. Min. 55, 1167-81.Google Scholar
Bearth, (P.), 1959. On the alkali massif of the Werner Bjerge in East Greenland. Medd. Gronland. 153, 62 pp.Google Scholar
Bøggled, (O. B.), 1953. The Mineralogy of Greenland. Copenhagen.Google Scholar
Drake, (M. J.) and Weill, (D. F.), 1972. New rare earth dement standards for electron microprobe analysis. Chem. Geol. 10, 179-81.CrossRefGoogle Scholar
Emeleus, (C. H.) and Harry, (W. T.), 1970. The Igaliko nepheline syenite complex. Gronlands Geol. Unders. Bull. 85.Google Scholar
Flink, (G.), 1901. On the minerals from Narsarsuk on the Firth of Tunugdliarfik in southern Greenland, Medd. Gronland, 1.Google Scholar
Gordon, (S. G.), 1924. Minerals obtained in Greenland on the second Academy-Vaux Expedition 1923. Proc. Acad. Nat. Sci. Philadelphia, 76, 249-68.Google Scholar
Graham, (W. A. P.), 1935. An occurrence of narsarsukite in Montana. Amer. Min. 20, 598-601.Google Scholar
Huang, (W. G.) and Johns, (W. D.), 1967. Simultaneous determination of fluorine and chlorine in silicate rocks by a rapid spectrophotometric method. Anal. Chim. Acta, 37, 508-15.CrossRefGoogle Scholar
Jérémine, (E.) and Christophe-Michel-Lévy, (M.), 1961. Un nouveau gisement de narsarsukite (Identification d'un mineral denomme provisiorement ‘gouréite’ par A. Lacroix en 1934). Bull. Soc. frang. Min. Crist. 84, 191-4.Google Scholar
Macdonald, (R.), 1969. The petrology of alkaline dykes from the Tugtutoq area, south Greenland. Medd. Dansk geol. Foren. 19, 257-82.Google Scholar
Mercy, (E. L. P.) and Saunders, (M. J.), 1966. Precision and accuracy in the chemical determination of total Fe and Al in silicate rocks. Earth Planet. Sci. Lett. 1, 169-82.CrossRefGoogle Scholar
Peck, (L. C.) and Smith, (V. C.), 1964. Spectrophotometric determination of fluorine in silicate rocks. Talanta, 11, 1343-7.CrossRefGoogle Scholar
Pyatenko, (Yu. A.) and Pudovkina, (Z. V.) [], 1961. Crystal structure of narsarsukite in Crystal Chemistry of Large Cation Silicates (ed. Belov). (Transl. 1963) 128-36 N.Y.Google Scholar
Rajasekaran, (K. C.), 1966. Narsarsukite from Mont St. Hilaire, Quebec, Canada. Canad. Min. 8, 506-14.Google Scholar
Saebø, (P. C.), 1966. A short comment on some Norwegian mineral deposits within the igneous rock complex of the Oslo Region. Norsk geol. Tidsskrift, 46, 260-1.Google Scholar
[Semenov, (E. I.)] CeMeHOB (E. И.), 1969. (Mineralogy of the Ilimaussaq alkalic massif). Moscow, .Google Scholar
Stewart, (D. B.), 1959. Narsarsukite from Sage Creek, Sweet Grass Hills, Montana. Amer. Min. 44, 265-73.Google Scholar
Sweatman, (T. R.) and Long, (J. V. P.), 1969. Quantitative electron-probe microanalysis of rock-forming minerals. Journ. Petrology, 10, 332-79.CrossRefGoogle Scholar
Upton, (B. G. J.), 1974. The alkaline province of south-west Greenland in The Alkaline Rocks (ed. Sorensen), 221-37, Wiley.Google Scholar
Upton, (B. G. J.), Thomas, (J. E.), and Macdonald, (R.), 1971. Chemical variation within three alkaline complexes in south Greenland. Lithos, 4, 163-84.CrossRefGoogle Scholar
Vlasov, (K. A.), Kuz'menko, (M. V.), and Es'Kova, (E. M.) , 1966. The Lovozero alkali massif. (Transl. from U.S.S.R. Acad. Sci. Press, Moscow, 1959) Edinburgh (Oliver & Boyd).Google Scholar
Warren, (B. E.) and Ambrrg, (C. R.), 1934. X-ray study of narsarsukite, Na2(TiFe)Si4O11. Amer. Min. 19, 546-8.Google Scholar