Stratigraphy, structure and geochemistry of Archaean supracrustal rocks from Oqaatsut and Naajaat Qaqqaat
Two Archaean supracrustal sequences in the area north-east of Disko Bugt, c. 1950 and c. 800 m in thickness, are dominated by pelitic and semipelitic mica schists, interlayered with basic meta-volcanic rocks. A polymict conglomerate occurs locally at the base of one of the sequences. One of the supr...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.583.4156 2023-05-15T16:01:05+02:00 Stratigraphy, structure and geochemistry of Archaean supracrustal rocks from Oqaatsut and Naajaat Qaqqaat Henrik Rasmussen Lars Frimodt Pedersen The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.583.4156 http://www.geus.dk/publications/bull-gl/nr181/nr181_p065-078.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.583.4156 http://www.geus.dk/publications/bull-gl/nr181/nr181_p065-078.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geus.dk/publications/bull-gl/nr181/nr181_p065-078.pdf Archaean Disko Bugt geochemistry supracrustal rocks West Greenland The Precambrian terrain north-east of Disko Bugt con text ftciteseerx 2016-08-28T00:04:40Z Two Archaean supracrustal sequences in the area north-east of Disko Bugt, c. 1950 and c. 800 m in thickness, are dominated by pelitic and semipelitic mica schists, interlayered with basic meta-volcanic rocks. A polymict conglomerate occurs locally at the base of one of the sequences. One of the supracrustal sequences has undergone four phases of deformation; the other three phases. In both sequences an early phase, now represented by isoclinal folds, was followed by north-west-directed thrusting. A penetrative deformation represented by upright to steeply inclined folds is only recognised in one of the sequences. Steep, brittle N–S and NW–SE striking faults transect all rock units including late stage dolerites and lamprophyres. Investigation of major- and trace-element geochemistry based on discrimination diagrams for tectonic setting suggests that both metasediments and metavolcanic rocks were deposited in an environment similar to a modern back-arc setting. Text Disko bugt Greenland Naajaat Oqaatsut Unknown Greenland |
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Open Polar |
collection |
Unknown |
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ftciteseerx |
language |
English |
topic |
Archaean Disko Bugt geochemistry supracrustal rocks West Greenland The Precambrian terrain north-east of Disko Bugt con |
spellingShingle |
Archaean Disko Bugt geochemistry supracrustal rocks West Greenland The Precambrian terrain north-east of Disko Bugt con Henrik Rasmussen Lars Frimodt Pedersen Stratigraphy, structure and geochemistry of Archaean supracrustal rocks from Oqaatsut and Naajaat Qaqqaat |
topic_facet |
Archaean Disko Bugt geochemistry supracrustal rocks West Greenland The Precambrian terrain north-east of Disko Bugt con |
description |
Two Archaean supracrustal sequences in the area north-east of Disko Bugt, c. 1950 and c. 800 m in thickness, are dominated by pelitic and semipelitic mica schists, interlayered with basic meta-volcanic rocks. A polymict conglomerate occurs locally at the base of one of the sequences. One of the supracrustal sequences has undergone four phases of deformation; the other three phases. In both sequences an early phase, now represented by isoclinal folds, was followed by north-west-directed thrusting. A penetrative deformation represented by upright to steeply inclined folds is only recognised in one of the sequences. Steep, brittle N–S and NW–SE striking faults transect all rock units including late stage dolerites and lamprophyres. Investigation of major- and trace-element geochemistry based on discrimination diagrams for tectonic setting suggests that both metasediments and metavolcanic rocks were deposited in an environment similar to a modern back-arc setting. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Henrik Rasmussen Lars Frimodt Pedersen |
author_facet |
Henrik Rasmussen Lars Frimodt Pedersen |
author_sort |
Henrik Rasmussen |
title |
Stratigraphy, structure and geochemistry of Archaean supracrustal rocks from Oqaatsut and Naajaat Qaqqaat |
title_short |
Stratigraphy, structure and geochemistry of Archaean supracrustal rocks from Oqaatsut and Naajaat Qaqqaat |
title_full |
Stratigraphy, structure and geochemistry of Archaean supracrustal rocks from Oqaatsut and Naajaat Qaqqaat |
title_fullStr |
Stratigraphy, structure and geochemistry of Archaean supracrustal rocks from Oqaatsut and Naajaat Qaqqaat |
title_full_unstemmed |
Stratigraphy, structure and geochemistry of Archaean supracrustal rocks from Oqaatsut and Naajaat Qaqqaat |
title_sort |
stratigraphy, structure and geochemistry of archaean supracrustal rocks from oqaatsut and naajaat qaqqaat |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.583.4156 http://www.geus.dk/publications/bull-gl/nr181/nr181_p065-078.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Disko bugt Greenland Naajaat Oqaatsut |
genre_facet |
Disko bugt Greenland Naajaat Oqaatsut |
op_source |
http://www.geus.dk/publications/bull-gl/nr181/nr181_p065-078.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.583.4156 http://www.geus.dk/publications/bull-gl/nr181/nr181_p065-078.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766397089371127808 |