Abstract
Rb-Sr whole rock isochron ages of 1950 m.y. and 1725 m.y. obtained on rock units of the Hagar migmatite sheet indicate that it is an early Proterozoic gneiss complex and not part of a mobile Caledonian infrastructure. New isotopic ages and recent fieldwork give no support to the concept of mobile Caledonian migmatitic masses rising into the suprastructure as envisaged in the classic “stockwerke” model for the East Greenland Caledonian fold belt. However, K-Ar mineral ages ranging from 415–462 m.y. indicate a significant Caledonian thermal event. Relationships between the Hagar sheet and bordering metasediments are discussed, including evidence for a middle Proterozoic group of sediments metamorphosed before deposition of the late Precambrian Petermann Series and Eleonore Bay Group.
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References
Backlund, H.G.: Contributions to the geology of Northeast Greenland. Medd. Groenland 74 (11), 207–296 (1930)
Caby, R.: Investigations on the Lower Eleonore Bay Group in the Alpefjord region, central East Greenland. Rapp. Groenlands geol. Unders. 80, 102–106 (1976)
Friderichsen, J.D., Higgins, A.K.: Reconnaissance work in the crystalline complexes of northern East Greenland between 72 ° and 74 ° N. Rapp. Groenlands geol. Unders. 80, 98–102 (1976)
Haller, J.: Der “Zentrale Metamorphe Komplex” von NE-Grönland. Teil I. Die geologische Karte von Suess Land, Gletscherland und Goodenoughs Land. Medd. Groenland 73 I (3), 174 pp. (1955)
Haller, J.: Geologie der Nunatakker Region von Zentral-Ostgrönland. Medd. Groenland 154 (1), 172 pp. (1956)
Haller, J.: Der “Zentrale Metamorphe Komplex” von NE-Grönland. Teil II. Die geologische Karte der Staunings Alper und des Forsblads Fjordes. Medd. Groenland 154 (3), 53 pp. (1958)
Haller, J.: Geology of the East Greenland Caledonides, 413 pp. New York: Interscience Publishers 1971
Haller, J., Kulp, J.L.: Absolute age determinations in East Greenland. Medd. Groenland 171 (1), 77 pp. (1962)
Hansen, B.T.: A geochronological study of polymetamorphism within the Caledonian mountain belt of central East Greenland. Dissertation 5761, E.T.H., Zürich, 77 pp. (1976)
Hansen, B.T., Frick, U., Steiger, R.H.: The geochronology of the Scoresby Sund area. 5: K/Ar mineral ages. Rapp. Groenlands geol. Unders. 58, 59–61 (1973a)
Hansen, B.T., Higgins, A.K., Bär, M.-T.: Rb-Sr and U-Pb age patterns in polymetamorphic sediments from the southern part of the East Greenland Caledonides. Bull. Geol. Soc. Denmark (accepted for publication)
Hansen, B.T., Oberli, F., Steiger, R.H.: The geochronology of the Scoresby Sund area. 4: Rb/Sr whole rock and mineral ages. Rapp. Groenlands geol. Unders. 58, 55–58 (1973b)
Hansen, B.T., Oberli, F., Steiger, R.H.: The geochronology of the Scoresby Sund area, central East Greenland. 6: Rb/Sr whole rock and U-Pb ages. Rapp. Groenlands geol. Unders. 66, 32–38 (1974)
Henriksen, N., Higgins, A.K.: East Greenland Caledonian fold belt. In: Geology of Greenland (A. Escher, and W.S. Watt, eds.), pp. 182–246. Copenhagen: Geol. Surv. Greenland 1976
Higgins, A.K.: Pre-Caledonian metamorphic complexes within the southern part of the East Greenland Caledonides. J. Geol. Soc. London 132, 289–305 (1976)
Higgins, A.K., Friderichsen, J.D., Thyrsted, T.: Basement-cover relationships and metamorphic studies in the East Greenland Caledonides (72 °–74 ° N). Rapp. Groenlands geol. Unders. 85, 109–114 (1977)
Koch, L., Haller, J.: Geological map of East Greenland 72 °–76 ° N. Lat. (1:250,000). Medd. Groenland 183, 26 pp. (1971)
Odell, N.E.: The structure of the Kejser Franz Josephs Fjord region, North-East Greenland. Medd. Groenland 119 (6), 54 PP. (1939)
Odell, N.E.: The petrography of the Franz Josef Fjord region, North-East Greenland, in relation to its structures. Trans. Roy. Soc. Edinburgh 61 (1), 221–246 (1944)
Pankhurst, R.J., O'Nions, R.K.: Determinations of Rb/Sr and 87Sr/86Sr ratios of some standard rocks and evaluation of X-ray fluorescence spectrometry in Rb-Sr geochemistry. Chem. Geol. 12, 127–136 (1973)
Parkinson, M.M.L., Whittard, W.F.: The geological work of the Cambridge expedition to East Greenland in 1929. Quart. J. Geol. Soc. London, 87, 650–674 (1931)
Rex, D.C., Dodson, M.H.: Improved resolutions and precision of argon analysis using an MS10 mass spectrometer. Eclogae Geol. Helv. 63, 257–280 (1970)
Rex, D.C., Gledhill, A.: Reconnaissance geochronology of the infracrustal rocks of Flyverfjord, Scoresby Sund, East Greenland. Bull. Geol. Soc. Denmark 23, 49–54 (1974)
Rex, D.C., Gledhill, A.R., Higgins, A.K.: Progress report on geochronological investigations in the crystalline complexes of the East Greenland Caledonian fold belt between 72 ° and 74 ° N. Rapp. Groenlands geol. Unders. 80, 127–133 (1976)
Rex, D.C., Gledhill, A.R., Higgins, A.K.: Precambrian Rb-Sr isochron ages from the crystalline complexes of inner Forsblads Fjord, East Greenland fold belt. Rapp. Groenlands geol. Unders. 85, 122–126 (1977)
Steiger, R.H., Henriksen, N.: The geochronology of the Scoresby Sund area. Progress report 3: zircon ages. Rapp. Groenlands geol. Unders. 48, 109–114 (1972)
Steiger, R.H., Jager, E.: 1977. Subcommision on geochronology: convention on the use of decay constants in geo- and cosmochronology. Earth. Planet. Sci. Lett. 36, 359–362 (1977)
Teichert, C.: Untersuchungen zum Bau des kaledonischen Gebirges in Ostgrönland. Medd. Groenland 95, (1), 121 pp. (1933)
Wegmann, C.E.: Preliminary report on the Caledonian orogeny in Christian X's Land (North-East Greenland). Medd. Groenland 103 (3), 59 pp. (1935)
Wenk, E., Haller, J.: Geological explorations in the Petermann region, western part of Fræankels Land, East Greenland. Medd. Groenland 111 (3), 48 pp. (1953)
Wordie, J.M.: Cambridge East Greenland expedition 1929: ascent of Petermann Peak. Geogr. J. 75, 481–495 (1930)
York, D.: Least squares fitting of a straight line with correlated errors. Earth Planet. Sci. Lett. 5, 320–324 (1969)
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Higgins, A.K., Friderichsen, J.D., Rex, D.C. et al. Early Proterozoic isotopic ages in the East Greenland Caledonian fold belt. Contr. Mineral. and Petrol. 67, 87–94 (1978). https://doi.org/10.1007/BF00371636
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DOI: https://doi.org/10.1007/BF00371636