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Geological processes defining the formation of plumasite-type corundum in the Paleoproterozoic Isertoq Terrane, South-East Greenland

Poulsen, Majken D. ; Keulen, Nynke; van Hinsberg, Vincent J.; Kolb, Jochen ORCID iD icon 1; Frei, Robert; Thomsen, Tonny B.
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)

Abstract:

Plumasite-type corundum occurrences in the Nattivit area in South-East Greenland offer a unique opportunity to study corundum formation in-situ where pegmatites intruded into metamorphosed lherzolite and dunite of the Archean-Paleoproterozoic continental crust. The Nattivit area, located in the Isertoq Terrane of North Atlantic Craton, forms part of the overriding plate during convergence of the Nagssugtoqidian orogen (1910-1840 Ma). New field observations and elemental and isotopic geochemical analysis provide further insights in the history of crustal convergence, its exhumation and how corundum was formed. The continental crust in the area consists of metamorphosed mafic to ultramafic rocks and tonalite-trondhjemite-granodiorite (TTG) gneisses, where the mafic rocks in the Isertoq Terrane yield a εNd T$_{DM}$ model age of 3000–2800 Ma. Dunite and lherzolite sills/dikes intruded the mafic rocks before the intrusion of the TTG sheets. The intrusion ages for the TTG obtained from zircon U-Pb geochronology are 2818 ± 8 Ma, 2760 ± 13 Ma to 2667 ± 7 Ma. U-Pb zircon data, zircon textures and Th/U ratios indicate metamorphism occurred at 2698 ± 7 Ma to 2629 ± 11 Ma, 2500–2400 Ma and 1900–1600 Ma. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000155658
Veröffentlicht am 03.02.2023
Originalveröffentlichung
DOI: 10.1016/j.precamres.2022.106940
Scopus
Zitationen: 1
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Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2023
Sprache Englisch
Identifikator ISSN: 0301-9268
KITopen-ID: 1000155658
Erschienen in Precambrian Research
Verlag Elsevier
Band 385
Seiten Art.-Nr.: 106940
Vorab online veröffentlicht am 24.12.2022
Schlagwörter Ultramafic rocks, Nagssugtoqidian Orogen, Metasomatism, Pegmatite, U-Pb zircon dating
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