Extensional exhumation of a high-pressure granulite terrane in Payer Land, Greenland Caledonides: structural, petrologic, and geochronologic evidence from metapelites
The Payer Land gneiss complex is unique among the mostly amphibolite-facies, mid-crustal gneiss complexes in the East Greenland Caledonides due to its well-preserved, regional high-pressure (HP) granulite-facies metamorphism. High-pressure high-temperature (HPHT) assemblages are recognized in maf...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2002
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e02-019 http://www.nrcresearchpress.com/doi/pdf/10.1139/e02-019 |
id |
crcansciencepubl:10.1139/e02-019 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e02-019 2024-09-09T19:38:44+00:00 Extensional exhumation of a high-pressure granulite terrane in Payer Land, Greenland Caledonides: structural, petrologic, and geochronologic evidence from metapelites Gilotti, Jane A Elvevold, Synnøve 2002 http://dx.doi.org/10.1139/e02-019 http://www.nrcresearchpress.com/doi/pdf/10.1139/e02-019 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 39, issue 8, page 1169-1187 ISSN 0008-4077 1480-3313 journal-article 2002 crcansciencepubl https://doi.org/10.1139/e02-019 2024-07-25T04:10:03Z The Payer Land gneiss complex is unique among the mostly amphibolite-facies, mid-crustal gneiss complexes in the East Greenland Caledonides due to its well-preserved, regional high-pressure (HP) granulite-facies metamorphism. High-pressure high-temperature (HPHT) assemblages are recognized in mafic, ultramafic, granitic, and metasedimentary lithologies. Anatectic metapelites contain the assemblage garnet + kyanite + K-feldspar + antiperthite (exsolved ternary feldspar) + quartz ± biotite ± rutile and record approximately the same peak metamorphic conditions (pressure (P) = 1.41.5 GPa, temperature (T) = 800850°C) as those of the neighboring mafic HP granulites. The HP granulite-facies metamorphism is Caledonian based on in situ UThPb electron microprobe dating of monazite from two samples of the aluminous paragneiss. The monazites are found along garnetkyanite phase boundaries, as inclusions in garnet and kyanite, and within small leucocratic melt pods (K-feldspar + plagioclase + kyanite ± garnet) within the HPHT paragneisses. Mylonitic equivalents of the metapelites contain a detrital monazite age signature that suggests the Payer Land paragneisses correlate with other Mesoproterozoic metasedimentary sequences in the area. The gneisses form a metamorphic core complex that is separated from the overlying low-grade sedimentary rocks of the Neoproterozoic Eleonore Bay Supergroup by an extensional detachment. This newly recognized Payer Land detachment is part of a system of prominent extensional faults located in the southern half of the Greenland Caledonides (i.e., south of 76°N). The HP granulites preserve the deepest level of crust exposed in this southern segment of the orogen and attest to significant crustal thickening. Article in Journal/Newspaper East Greenland Greenland Canadian Science Publishing Greenland Payer Land ENVELOPE(-22.417,-22.417,74.500,74.500) Canadian Journal of Earth Sciences 39 8 1169 1187 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
The Payer Land gneiss complex is unique among the mostly amphibolite-facies, mid-crustal gneiss complexes in the East Greenland Caledonides due to its well-preserved, regional high-pressure (HP) granulite-facies metamorphism. High-pressure high-temperature (HPHT) assemblages are recognized in mafic, ultramafic, granitic, and metasedimentary lithologies. Anatectic metapelites contain the assemblage garnet + kyanite + K-feldspar + antiperthite (exsolved ternary feldspar) + quartz ± biotite ± rutile and record approximately the same peak metamorphic conditions (pressure (P) = 1.41.5 GPa, temperature (T) = 800850°C) as those of the neighboring mafic HP granulites. The HP granulite-facies metamorphism is Caledonian based on in situ UThPb electron microprobe dating of monazite from two samples of the aluminous paragneiss. The monazites are found along garnetkyanite phase boundaries, as inclusions in garnet and kyanite, and within small leucocratic melt pods (K-feldspar + plagioclase + kyanite ± garnet) within the HPHT paragneisses. Mylonitic equivalents of the metapelites contain a detrital monazite age signature that suggests the Payer Land paragneisses correlate with other Mesoproterozoic metasedimentary sequences in the area. The gneisses form a metamorphic core complex that is separated from the overlying low-grade sedimentary rocks of the Neoproterozoic Eleonore Bay Supergroup by an extensional detachment. This newly recognized Payer Land detachment is part of a system of prominent extensional faults located in the southern half of the Greenland Caledonides (i.e., south of 76°N). The HP granulites preserve the deepest level of crust exposed in this southern segment of the orogen and attest to significant crustal thickening. |
format |
Article in Journal/Newspaper |
author |
Gilotti, Jane A Elvevold, Synnøve |
spellingShingle |
Gilotti, Jane A Elvevold, Synnøve Extensional exhumation of a high-pressure granulite terrane in Payer Land, Greenland Caledonides: structural, petrologic, and geochronologic evidence from metapelites |
author_facet |
Gilotti, Jane A Elvevold, Synnøve |
author_sort |
Gilotti, Jane A |
title |
Extensional exhumation of a high-pressure granulite terrane in Payer Land, Greenland Caledonides: structural, petrologic, and geochronologic evidence from metapelites |
title_short |
Extensional exhumation of a high-pressure granulite terrane in Payer Land, Greenland Caledonides: structural, petrologic, and geochronologic evidence from metapelites |
title_full |
Extensional exhumation of a high-pressure granulite terrane in Payer Land, Greenland Caledonides: structural, petrologic, and geochronologic evidence from metapelites |
title_fullStr |
Extensional exhumation of a high-pressure granulite terrane in Payer Land, Greenland Caledonides: structural, petrologic, and geochronologic evidence from metapelites |
title_full_unstemmed |
Extensional exhumation of a high-pressure granulite terrane in Payer Land, Greenland Caledonides: structural, petrologic, and geochronologic evidence from metapelites |
title_sort |
extensional exhumation of a high-pressure granulite terrane in payer land, greenland caledonides: structural, petrologic, and geochronologic evidence from metapelites |
publisher |
Canadian Science Publishing |
publishDate |
2002 |
url |
http://dx.doi.org/10.1139/e02-019 http://www.nrcresearchpress.com/doi/pdf/10.1139/e02-019 |
long_lat |
ENVELOPE(-22.417,-22.417,74.500,74.500) |
geographic |
Greenland Payer Land |
geographic_facet |
Greenland Payer Land |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_source |
Canadian Journal of Earth Sciences volume 39, issue 8, page 1169-1187 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e02-019 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
39 |
container_issue |
8 |
container_start_page |
1169 |
op_container_end_page |
1187 |
_version_ |
1809907646012063744 |