Skip to content

Research at St Andrews

The petrology and petrogenesis of the North Motzfeldt Centre, Gardar Province, South Greenland

Research output: Contribution to journalArticle


A. A. Finch, K M Goodenough, H M Salmon, T Andersen

School/Research organisations


North Motzfeldt is an intrusive igneous centre within the Igaliku (formerly spelt Igaliko) complex, Gardar Province, South Greenland. A detailed field description of the centre is given, with preliminary geochemical and isotopic data. The North Motzfeldt centre is intruded into Ketilidian granitoid basement rocks, and current exposure retains parts of the original roof against earlier Gardar eruptives and elastic sediments of the Eriksfjord formation. The unconformity between the Ketilidian and the overlying Eriksfjord is believed to have been crucial in the siting of the centre. The centre is subdivided into two major units, NM1 and NM2. This was followed by significant peralkaline nepheline microsyenite in sheets, characterized by rare element-rich accessory minerals including rinkite-mosandrite, pyrochlore and lavenite. A significant microsyenite body is called NM3. A preliminary Rb-Sr isochron of 1226 +/- 27 Ma indicates a far younger age for the centre than previously thought (similar to 1350 Ma). Cross-cutting relationships between North Motzfeldt and rocks of the adjacent Motzfeldt centre require a reappraisal of the chronology of Motzfeldt magmatism. We suggest that rocks previously believed to comprise the Motzfeldt centre represent the products of multiple phases of magmatism from Early- to Mid-Gardar times.



Original languageEnglish
Pages (from-to)759-774
Number of pages16
JournalMineralogical Magazine
Issue number6
Publication statusPublished - Dec 2001

    Research areas

  • Gardar, Ketilidian, Nepheline syenite, Magma chamber, Roof zones

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Sulphur isotopes of alkaline magmas unlock long-term records of crustal recycling on Earth

    Hutchison, W., Babiel, R., Finch, A. A., Marks, M., Markl, G., Boyce, A. J., Stüeken, E. E., Friis, H., Borst, A. M. & Horsburgh, N. J., 16 Sep 2019, In : Nature Communications. 10, 12 p., 4208.

    Research output: Contribution to journalArticle

  2. Hydrothermal alteration of eudialyte-hosted critical metal deposits: fluid source and implications for deposit grade

    van de Ven, M. A. J., Borst, A. M., Davies, G. R., Hunt, E. J. & Finch, A. A., 10 Jul 2019, In : Minerals. 9, 7, 23 p., 422.

    Research output: Contribution to journalArticle

  3. Optical determination of the width of the band-tail states, and the excited state and ground state energies of the principal dosimetric trap in feldspar

    Riedesel, S., King, G. E., Prasad, A. K., Kumar, R., Finch, A. A. & Jain, M., Jun 2019, In : Radiation Measurements. 125, p. 40-51

    Research output: Contribution to journalArticle

  4. From Mantle to Motzfeldt: a genetic model for syenite-hosted Ta,Nb-mineralisation

    Finch, A. A., McCreath, J. A., Reekie, C. D. J., Hutchison, W., Ismaila, A., Armour-Brown, A., Andersen, T. & Simonsen, S. L., Apr 2019, In : Ore Geology Reviews. 107, p. 402-416 15 p.

    Research output: Contribution to journalArticle

  5. A high sensitivity system for luminescence measurement of materials

    Finch, A. A., Wang, Y., Townsend, P. D. & Ingle, M., 5 Feb 2019, In : Luminescence. Early View

    Research output: Contribution to journalArticle

Related by journal

  1. Mineralogical Magazine (Journal)

    Anouk Margaretha Borst (Reviewer)
    29 Apr 2019

    Activity: Publication peer-review and editorial work typesPeer review of manuscripts

Related by journal

  1. Zirconosilicates in the kakortokites of the Ilímaussaq complex, South Greenland: implications for fluid evolution and high-field-strength and rare-earth element mineralization in agpaitic systems

    Borst, A. M., Friis, H., Andersen, T., Nielsen, T. F. D., Waight, T. E. & Smit, M. A., Feb 2016, In : Mineralogical Magazine. 80, 1, p. 5-30 26 p.

    Research output: Contribution to journalArticle

  2. Megacrysts and salic xenoliths in Scottish alkali basalts: derivatives of deep crustal intrusions and small-melt fractions from the upper mantle

    Upton, B. G. J., Finch, A. A. & Slaby, E., Dec 2009, In : Mineralogical Magazine. 73, 6, p. 943-956 14 p.

    Research output: Contribution to journalArticle

  3. Synthetic amphiboles and triple-chain silicates in the system Na2O-MgO-SiO2-H2O: phase characterization, compositional relations and excess H

    Maresch, W. V., Welch, M. D., Gottschalk, M., Ruthmann, W., Czank, M., Ashbrook, S. E. & Ashbrook, S. E. M., Dec 2009, In : Mineralogical Magazine. 73, 6, p. 957-996 40 p.

    Research output: Contribution to journalArticle

  4. U-Pb geochronology of felsic volcanic rocks hosted in the Gafo Formation, South Portuguese Zone: relationship with Iberian Pyrite Belt magmatism

    Rosa, DRN., Finch, A. A., Andersen, T. & Inverno, MC., Oct 2008, In : Mineralogical Magazine. 72, 5, p. 1103-1118

    Research output: Contribution to journalArticle

  5. Coordination of Sr and Mg in calcite and aragonite

    Finch, A. A. & Allison, N., Oct 2007, In : Mineralogical Magazine. 71, p. 539-552 14 p.

    Research output: Contribution to journalArticle

ID: 786481