9Evolution of Neoarchaean supracrustal belts at the northern margin of the North Atlantic Craton, West
Archaean craton to the north, to form the Nagssugtoqidian orogen. The Palaeoproterozoic metamor-phic grade and strain intensity decrease northward through the orogen, allowing investigation of the reworked Archaean components in its northern part. Two Archaean supracrustal belts in this region – the...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.494.3932 2023-05-15T16:53:37+02:00 9Evolution of Neoarchaean supracrustal belts at the northern margin of the North Atlantic Craton, West Julie A. Hollis Marie Keiding Bo Møller Stensgaard Jeroen A. M. Van Gool Adam A. Garde The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.494.3932 http://www.geus.dk/publications/bull/nr11/nr11_p009-032.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.494.3932 http://www.geus.dk/publications/bull/nr11/nr11_p009-032.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geus.dk/publications/bull/nr11/nr11_p009-032.pdf North Atlantic Craton northern Nagssugtoqidian orogen LA-ICP-MS SIMS zircon text ftciteseerx 2016-01-08T08:41:26Z Archaean craton to the north, to form the Nagssugtoqidian orogen. The Palaeoproterozoic metamor-phic grade and strain intensity decrease northward through the orogen, allowing investigation of the reworked Archaean components in its northern part. Two Archaean supracrustal belts in this region – the Ikamiut and Kangilinaaq belts – are investigated here using field mapping, aeromagnetic data, zircon geochronology, and geochemistry. Both belts comprise quartzo-feldspathic and pelitic meta-sedimentary rocks, amphibolite, and minor calc-silicate rocks, anorthosite and ultramafic rocks. Pb-Pb and U-Pb dating of detrital zircons and host orthogneisses suggest deposition at c. 2800 Ma (Kan-gilinaaq belt) and after 2740 Ma (Ikamiut belt); both belts have zircons with Neoarchaean metamor-phic rims. Metasedimentary rocks and orthogneisses at Ikamiut share similar steep REE signatures with strong LREE enrichment, consistent with local derivation of the sediment and deposition direct-ly onto or proximal to the regional orthogneiss precursors. Zircon age data from Kangilinaaq indicate both local and distal sources for the sediment there. Geochemical data for Kangilinaaq amphibolites indicate bimodal, mixed felsic–mafic source rocks with island-arc basaltic affinities, consistent with a shelf or arc setting. Both belts experienced a similar tectono-metamorphic history involving Neoar-chaean amphibolite facies peak metamorphism at c. 2740–2700 Ma, possibly due to continued emplace- Text Ikamiut North Atlantic Unknown |
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Open Polar |
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ftciteseerx |
language |
English |
topic |
North Atlantic Craton northern Nagssugtoqidian orogen LA-ICP-MS SIMS zircon |
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North Atlantic Craton northern Nagssugtoqidian orogen LA-ICP-MS SIMS zircon Julie A. Hollis Marie Keiding Bo Møller Stensgaard Jeroen A. M. Van Gool Adam A. Garde 9Evolution of Neoarchaean supracrustal belts at the northern margin of the North Atlantic Craton, West |
topic_facet |
North Atlantic Craton northern Nagssugtoqidian orogen LA-ICP-MS SIMS zircon |
description |
Archaean craton to the north, to form the Nagssugtoqidian orogen. The Palaeoproterozoic metamor-phic grade and strain intensity decrease northward through the orogen, allowing investigation of the reworked Archaean components in its northern part. Two Archaean supracrustal belts in this region – the Ikamiut and Kangilinaaq belts – are investigated here using field mapping, aeromagnetic data, zircon geochronology, and geochemistry. Both belts comprise quartzo-feldspathic and pelitic meta-sedimentary rocks, amphibolite, and minor calc-silicate rocks, anorthosite and ultramafic rocks. Pb-Pb and U-Pb dating of detrital zircons and host orthogneisses suggest deposition at c. 2800 Ma (Kan-gilinaaq belt) and after 2740 Ma (Ikamiut belt); both belts have zircons with Neoarchaean metamor-phic rims. Metasedimentary rocks and orthogneisses at Ikamiut share similar steep REE signatures with strong LREE enrichment, consistent with local derivation of the sediment and deposition direct-ly onto or proximal to the regional orthogneiss precursors. Zircon age data from Kangilinaaq indicate both local and distal sources for the sediment there. Geochemical data for Kangilinaaq amphibolites indicate bimodal, mixed felsic–mafic source rocks with island-arc basaltic affinities, consistent with a shelf or arc setting. Both belts experienced a similar tectono-metamorphic history involving Neoar-chaean amphibolite facies peak metamorphism at c. 2740–2700 Ma, possibly due to continued emplace- |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Julie A. Hollis Marie Keiding Bo Møller Stensgaard Jeroen A. M. Van Gool Adam A. Garde |
author_facet |
Julie A. Hollis Marie Keiding Bo Møller Stensgaard Jeroen A. M. Van Gool Adam A. Garde |
author_sort |
Julie A. Hollis |
title |
9Evolution of Neoarchaean supracrustal belts at the northern margin of the North Atlantic Craton, West |
title_short |
9Evolution of Neoarchaean supracrustal belts at the northern margin of the North Atlantic Craton, West |
title_full |
9Evolution of Neoarchaean supracrustal belts at the northern margin of the North Atlantic Craton, West |
title_fullStr |
9Evolution of Neoarchaean supracrustal belts at the northern margin of the North Atlantic Craton, West |
title_full_unstemmed |
9Evolution of Neoarchaean supracrustal belts at the northern margin of the North Atlantic Craton, West |
title_sort |
9evolution of neoarchaean supracrustal belts at the northern margin of the north atlantic craton, west |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.494.3932 http://www.geus.dk/publications/bull/nr11/nr11_p009-032.pdf |
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Ikamiut North Atlantic |
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Ikamiut North Atlantic |
op_source |
http://www.geus.dk/publications/bull/nr11/nr11_p009-032.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.494.3932 http://www.geus.dk/publications/bull/nr11/nr11_p009-032.pdf |
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1766044202970382336 |