New insights from field observations of the Younger giant dyke complex and mafic lamprophyres of the Gardar Province on Tuttutooq island, South Greenland
The Gardar Province of south Greenland is defined by the products of alkaline igneous magmatism during the Mesoproterozoic. The most laterally extensive Gardar intrusions are a series of giant dyke complexes best exposed on the Tuttutooq archipelago. We present new field observations and a geologica...
Published in: | GEUS Bulletin |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Geological Survey of Denmark and Greenland (GEUS)
2021
|
Subjects: | |
Online Access: | https://geusbulletin.org/index.php/geusb/article/view/6526 https://doi.org/10.34194/geusb.v47.6526 |
id |
ftjgeusbullet:oai:geusjournals.org:article/6526 |
---|---|
record_format |
openpolar |
spelling |
ftjgeusbullet:oai:geusjournals.org:article/6526 2023-05-15T16:27:26+02:00 New insights from field observations of the Younger giant dyke complex and mafic lamprophyres of the Gardar Province on Tuttutooq island, South Greenland Koopmans, Lot Webster, Robert A. Changleng, Rory Mathieson, Lucy Murphy, Alasdair J. Finch, Adrian A. McCarthy, William 2021-06-16 application/pdf text/html text/xml application/epub+zip https://geusbulletin.org/index.php/geusb/article/view/6526 https://doi.org/10.34194/geusb.v47.6526 eng eng Geological Survey of Denmark and Greenland (GEUS) https://geusbulletin.org/index.php/geusb/article/view/6526/14172 https://geusbulletin.org/index.php/geusb/article/view/6526/14174 https://geusbulletin.org/index.php/geusb/article/view/6526/14175 https://geusbulletin.org/index.php/geusb/article/view/6526/14173 https://geusbulletin.org/index.php/geusb/article/view/6526/14176 https://geusbulletin.org/index.php/geusb/article/view/6526 doi:10.34194/geusb.v47.6526 Copyright (c) 2021 Lot Koopmans, Robert A. Webster, Rory Changleng, Lucy Mathieson, Alasdair J. Murphy, Adrian A. Finch, William McCarthy https://creativecommons.org/licenses/by/4.0 CC-BY GEUS Bulletin; Vol. 47 (2021): Annual Volume 2021 2597-2154 2597-2162 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Rapid Communication. Peer-reviewed Article. 2021 ftjgeusbullet https://doi.org/10.34194/geusb.v47.6526 2022-03-15T17:22:28Z The Gardar Province of south Greenland is defined by the products of alkaline igneous magmatism during the Mesoproterozoic. The most laterally extensive Gardar intrusions are a series of giant dyke complexes best exposed on the Tuttutooq archipelago. We present new field observations and a geological map of north-east Tuttutooq island that provide fresh insights into the temporal evolution of the Younger giant dyke complex and two associated ultramafic lamprophyres. Our data demonstrate that distinctive crystallisation regimes occurred in different sectors of the dyke complex, leading to the formation of marginal gabbros and ovoid pod-like domains displaying lamination, modal layering and/or more evolved differentiates. We infer that at least two pulses of magma contributed to the formation of the Younger giant dyke complex. In addition, the relative ages of two ultramafic lamprophyre diatremes are constrained and attributed to two distinct phases of rifting in the Gardar Province. Article in Journal/Newspaper Greenland GEUS Bulletin (Geological Survey of Denmark and Greenland) Greenland Tuttutooq ENVELOPE(-46.443,-46.443,60.853,60.853) GEUS Bulletin 47 |
institution |
Open Polar |
collection |
GEUS Bulletin (Geological Survey of Denmark and Greenland) |
op_collection_id |
ftjgeusbullet |
language |
English |
description |
The Gardar Province of south Greenland is defined by the products of alkaline igneous magmatism during the Mesoproterozoic. The most laterally extensive Gardar intrusions are a series of giant dyke complexes best exposed on the Tuttutooq archipelago. We present new field observations and a geological map of north-east Tuttutooq island that provide fresh insights into the temporal evolution of the Younger giant dyke complex and two associated ultramafic lamprophyres. Our data demonstrate that distinctive crystallisation regimes occurred in different sectors of the dyke complex, leading to the formation of marginal gabbros and ovoid pod-like domains displaying lamination, modal layering and/or more evolved differentiates. We infer that at least two pulses of magma contributed to the formation of the Younger giant dyke complex. In addition, the relative ages of two ultramafic lamprophyre diatremes are constrained and attributed to two distinct phases of rifting in the Gardar Province. |
format |
Article in Journal/Newspaper |
author |
Koopmans, Lot Webster, Robert A. Changleng, Rory Mathieson, Lucy Murphy, Alasdair J. Finch, Adrian A. McCarthy, William |
spellingShingle |
Koopmans, Lot Webster, Robert A. Changleng, Rory Mathieson, Lucy Murphy, Alasdair J. Finch, Adrian A. McCarthy, William New insights from field observations of the Younger giant dyke complex and mafic lamprophyres of the Gardar Province on Tuttutooq island, South Greenland |
author_facet |
Koopmans, Lot Webster, Robert A. Changleng, Rory Mathieson, Lucy Murphy, Alasdair J. Finch, Adrian A. McCarthy, William |
author_sort |
Koopmans, Lot |
title |
New insights from field observations of the Younger giant dyke complex and mafic lamprophyres of the Gardar Province on Tuttutooq island, South Greenland |
title_short |
New insights from field observations of the Younger giant dyke complex and mafic lamprophyres of the Gardar Province on Tuttutooq island, South Greenland |
title_full |
New insights from field observations of the Younger giant dyke complex and mafic lamprophyres of the Gardar Province on Tuttutooq island, South Greenland |
title_fullStr |
New insights from field observations of the Younger giant dyke complex and mafic lamprophyres of the Gardar Province on Tuttutooq island, South Greenland |
title_full_unstemmed |
New insights from field observations of the Younger giant dyke complex and mafic lamprophyres of the Gardar Province on Tuttutooq island, South Greenland |
title_sort |
new insights from field observations of the younger giant dyke complex and mafic lamprophyres of the gardar province on tuttutooq island, south greenland |
publisher |
Geological Survey of Denmark and Greenland (GEUS) |
publishDate |
2021 |
url |
https://geusbulletin.org/index.php/geusb/article/view/6526 https://doi.org/10.34194/geusb.v47.6526 |
long_lat |
ENVELOPE(-46.443,-46.443,60.853,60.853) |
geographic |
Greenland Tuttutooq |
geographic_facet |
Greenland Tuttutooq |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
GEUS Bulletin; Vol. 47 (2021): Annual Volume 2021 2597-2154 2597-2162 |
op_relation |
https://geusbulletin.org/index.php/geusb/article/view/6526/14172 https://geusbulletin.org/index.php/geusb/article/view/6526/14174 https://geusbulletin.org/index.php/geusb/article/view/6526/14175 https://geusbulletin.org/index.php/geusb/article/view/6526/14173 https://geusbulletin.org/index.php/geusb/article/view/6526/14176 https://geusbulletin.org/index.php/geusb/article/view/6526 doi:10.34194/geusb.v47.6526 |
op_rights |
Copyright (c) 2021 Lot Koopmans, Robert A. Webster, Rory Changleng, Lucy Mathieson, Alasdair J. Murphy, Adrian A. Finch, William McCarthy https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.34194/geusb.v47.6526 |
container_title |
GEUS Bulletin |
container_volume |
47 |
_version_ |
1766016610619883520 |