Journal article
Metamorphic history of high-pressure granulites in Payer Land, Greenland Caledonides
Journal of metamorphic geology, Vol.21(1), pp.49-63
01/2003
DOI: 10.1046/j.1525-1314.2003.00419.x
Abstract
A high-P granulite facies gneiss complex occurs in the central part of the Ordovician-Devonian East Greenland Caledonian orogen. High-P metamorphism of the Payer Land gneiss complex resulted in formation of the assemblages Grt + Cpx + Amp + Qtz + Ru + or - Pl in mafic rocks and Grt + Ol + Cpx + Opx + Spl in rare ultramafic pods. Associated metapelites experienced anatexis in the kyanite stability field. Peak metamorphic assemblages formed at 800-850 degrees C at approximately 1.4-1.7 GPa. Mafic granulites contain abundant reaction textures, including the replacement of garnet by Opx + Spl + Pl symplectites, indicating that the high-P event was followed by decompression while the granulites remained at elevated T. Charnockitic gneisses show evidence of late Archaean ( approximately 2800-2400 m.y.) crustal growth and subsequent Palaeoproterozoic ( approximately 1850 m.y.) metamorphism. The gneiss complex experienced intense reworking during the Caledonian continental collision. On the basis of Caledonian monazite ages recorded from the high-P anatectic metapelites, the clockwise P-T evolution and formation of the high P-granulite facies assemblages is related to Caledonian crustal thickening, which resulted in formation of eclogites approximately 300 km N of Payer Land. The Payer Land granulites comprise a metamorphic core complex, which is separated from the overlying low-grade supracrustal rocks of the Neoproterozoic Eleonore Bay supergroup by a late Caledonian extensional fault zone.
Details
- Title: Subtitle
- Metamorphic history of high-pressure granulites in Payer Land, Greenland Caledonides
- Creators
- S Elvevold - Norwegian Polar InstituteK Thrane - Geological Survey of Denmark and GreenlandJ. A Gilotti - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of metamorphic geology, Vol.21(1), pp.49-63
- Publisher
- Blackwell
- DOI
- 10.1046/j.1525-1314.2003.00419.x
- ISSN
- 0263-4929
- eISSN
- 1525-1314
- Language
- English
- Date published
- 01/2003
- Academic Unit
- Earth and Environmental Sciences
- Record Identifier
- 9984229294602771
Metrics
16 Record Views