Serial interaction of primitive magmas with felsic and mafic crust recorded by gabbroic dikes from the Antarctic extension of the Karoo large igneous province
Two subvertical gabbroic dikes with widths of similar to 350 m (East-Muren) and >= 500 m (West-Muren) crosscut continental flood basalts in the Antarctic extension of the similar to 180 Ma Karoo large igneous province (LIP) in Vestfjella, western Dronning Maud Land. The dikes exhibit unusual geoc...
Published in: | Contributions to Mineralogy and Petrology |
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Main Authors: | , , , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Springer
2021
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Online Access: | http://hdl.handle.net/10138/329297 |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/329297 |
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Open Polar |
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HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Assimilation Differentiation Large igneous provinces Magmatism Modeling Geosciences |
spellingShingle |
Assimilation Differentiation Large igneous provinces Magmatism Modeling Geosciences Heinonen, Jussi S. Luttinen, Arto V. Spera, Frank J. Vuori, Saku K. Bohrson, Wendy A. Serial interaction of primitive magmas with felsic and mafic crust recorded by gabbroic dikes from the Antarctic extension of the Karoo large igneous province |
topic_facet |
Assimilation Differentiation Large igneous provinces Magmatism Modeling Geosciences |
description |
Two subvertical gabbroic dikes with widths of similar to 350 m (East-Muren) and >= 500 m (West-Muren) crosscut continental flood basalts in the Antarctic extension of the similar to 180 Ma Karoo large igneous province (LIP) in Vestfjella, western Dronning Maud Land. The dikes exhibit unusual geochemical profiles; most significantly, initial (at 180 Ma) epsilon(Nd) values increase from the dike interiors towards the hornfelsed wallrock basalts (from - 15.3 to - 7.8 in East-Muren and more gradually from - 9.0 to - 5.5 in West-Muren). In this study, we utilize models of partial melting and energy-constrained assimilation-fractional crystallization in deciphering the magmatic evolution of the dikes and their contact aureoles. The modeling indicates that both gabbroic dikes acquired the distinctly negative epsilon(Nd) values recorded by their central parts by varying degrees of assimilation of Archean crust at depth. This first phase of deep contamination was followed by a second event at or close to the emplacement level and is related to the interaction of the magmas with the wallrock basalts. These basalts belong to a distinct Karoo LIP magma type having initial epsilon(Nd) from - 2.1 to + 2.5, which provides a stark contrast to the epsilon(Nd) composition of the dike parental magmas (- 15.3 for East-Muren, - 9.0 for West-Muren) previously contaminated by Archean crust. For East-Muren, the distal hornfelses represent partially melted wallrock basalts and the proximal contact zones represent hybrids of such residues with differentiated melts from the intrusion; the magmas that were contaminated by the partial melts of the wallrock basalts were likely transported away from the currently exposed parts of the conduit before the magma-wallrock contact was sealed and further assimilation prevented. In contrast, for West-Muren, the assimilation of the wallrock basalt partial melts is recorded by the gradually increasing epsilon(Nd) of the presently exposed gabbroic rocks towards the roof contact with the basalts. Our ... |
author2 |
Petrology and Geochemistry Department of Geosciences and Geography Doctoral Programme in Geosciences Natural Sciences Unit |
format |
Article in Journal/Newspaper |
author |
Heinonen, Jussi S. Luttinen, Arto V. Spera, Frank J. Vuori, Saku K. Bohrson, Wendy A. |
author_facet |
Heinonen, Jussi S. Luttinen, Arto V. Spera, Frank J. Vuori, Saku K. Bohrson, Wendy A. |
author_sort |
Heinonen, Jussi S. |
title |
Serial interaction of primitive magmas with felsic and mafic crust recorded by gabbroic dikes from the Antarctic extension of the Karoo large igneous province |
title_short |
Serial interaction of primitive magmas with felsic and mafic crust recorded by gabbroic dikes from the Antarctic extension of the Karoo large igneous province |
title_full |
Serial interaction of primitive magmas with felsic and mafic crust recorded by gabbroic dikes from the Antarctic extension of the Karoo large igneous province |
title_fullStr |
Serial interaction of primitive magmas with felsic and mafic crust recorded by gabbroic dikes from the Antarctic extension of the Karoo large igneous province |
title_full_unstemmed |
Serial interaction of primitive magmas with felsic and mafic crust recorded by gabbroic dikes from the Antarctic extension of the Karoo large igneous province |
title_sort |
serial interaction of primitive magmas with felsic and mafic crust recorded by gabbroic dikes from the antarctic extension of the karoo large igneous province |
publisher |
Springer |
publishDate |
2021 |
url |
http://hdl.handle.net/10138/329297 |
long_lat |
ENVELOPE(-14.000,-14.000,-73.167,-73.167) ENVELOPE(-15.000,-15.000,-73.733,-73.733) |
geographic |
Antarctic The Antarctic Dronning Maud Land Vestfjella Muren |
geographic_facet |
Antarctic The Antarctic Dronning Maud Land Vestfjella Muren |
genre |
Antarc* Antarctic Dronning Maud Land |
genre_facet |
Antarc* Antarctic Dronning Maud Land |
op_relation |
10.1007/s00410-021-01777-6 SUOMEN AKATEMIA We thank the reviewers (Kurt S. Panter and an anonymous reviewer) for the encouraging and constructive comments and editor Mark Ghiorso for professional handling of the manuscript. We are grateful for the various FINNARP research expeditions that enabled the collection of the studied samples from these very remote areas; Mika Räisänen is especially thanked for providing many of the samples, which he studied in relation to his MSc Thesis. The staff of the Peter Hooper GeoAnalytical Lab of the Washington State University is thanked for the major element and trace element analyses and for the help and guidance in sample preparation on site. We are also very grateful to John Lassiter and the staff at the Isotope Geochemistry labs of the Department of Geological Sciences, University of Texas at Austin, for providing swift and high-precision Nd isotopic analyses. J. Heinonen wants to thank Melissa Scruggs for the feedback and suggestions she provided for this study in its infant stages. The research has highly benefited from the funding provided by the Academy of Finland Grants 295129 and 305663. W. Bohrson thanks the National Science Foundation for supporting development of the modeling tools used in this study. We thank the reviewers (Kurt S. Panter and an anonymous reviewer) for the encouraging and constructive comments and editor Mark Ghiorso for professional handling of the manuscript. We are grateful for the various FINNARP research expeditions that enabled the collection of the studied samples from these very remote areas; Mika R?is?nen is especially thanked for providing many of the samples, which he studied in relation to his MSc Thesis. The staff of the Peter Hooper GeoAnalytical Lab of the Washington State University is thanked for the major element and trace element analyses and for the help and guidance in sample preparation on site. We are also very grateful to John Lassiter and the staff at the Isotope Geochemistry labs of the Department of Geological Sciences, University of Texas at Austin, for providing swift and high-precision Nd isotopic analyses. J. Heinonen wants to thank Melissa Scruggs for the feedback and suggestions she provided for this study in its infant stages. The research has highly benefited from the funding provided by the Academy of Finland Grants 295129 and 305663. W. Bohrson thanks the National Science Foundation for supporting development of the modeling tools used in this study. Heinonen , J S , Luttinen , A V , Spera , F J , Vuori , S K & Bohrson , W A 2021 , ' Serial interaction of primitive magmas with felsic and mafic crust recorded by gabbroic dikes from the Antarctic extension of the Karoo large igneous province ' , Contributions to Mineralogy and Petrology , vol. 176 , no. 4 , 28 . https://doi.org/10.1007/s00410-021-01777-6 ORCID: /0000-0002-3129-0392/work/92659666 ORCID: /0000-0001-8998-4357/work/160774827 http://hdl.handle.net/10138/329297 2da18d29-9e61-413a-85fb-429bc8afaafb 000635135400001 |
op_rights |
info:eu-repo/semantics/openAccess openAccess |
container_title |
Contributions to Mineralogy and Petrology |
container_volume |
176 |
container_issue |
4 |
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1802651516612378624 |
spelling |
ftunivhelsihelda:oai:helda.helsinki.fi:10138/329297 2024-06-23T07:47:25+00:00 Serial interaction of primitive magmas with felsic and mafic crust recorded by gabbroic dikes from the Antarctic extension of the Karoo large igneous province Primitiivisten magmojen perättäiset vuorovaikutukset felsisen ja mafisen kuoren kanssa tallennettuna Karoon suuren magmaprovinssin gabrojuoniin Etelämantereella Heinonen, Jussi S. Luttinen, Arto V. Spera, Frank J. Vuori, Saku K. Bohrson, Wendy A. Petrology and Geochemistry Department of Geosciences and Geography Doctoral Programme in Geosciences Natural Sciences Unit 2021-04-22T08:37:01Z 21 application/pdf http://hdl.handle.net/10138/329297 eng eng Springer 10.1007/s00410-021-01777-6 SUOMEN AKATEMIA We thank the reviewers (Kurt S. Panter and an anonymous reviewer) for the encouraging and constructive comments and editor Mark Ghiorso for professional handling of the manuscript. We are grateful for the various FINNARP research expeditions that enabled the collection of the studied samples from these very remote areas; Mika Räisänen is especially thanked for providing many of the samples, which he studied in relation to his MSc Thesis. The staff of the Peter Hooper GeoAnalytical Lab of the Washington State University is thanked for the major element and trace element analyses and for the help and guidance in sample preparation on site. We are also very grateful to John Lassiter and the staff at the Isotope Geochemistry labs of the Department of Geological Sciences, University of Texas at Austin, for providing swift and high-precision Nd isotopic analyses. J. Heinonen wants to thank Melissa Scruggs for the feedback and suggestions she provided for this study in its infant stages. The research has highly benefited from the funding provided by the Academy of Finland Grants 295129 and 305663. W. Bohrson thanks the National Science Foundation for supporting development of the modeling tools used in this study. We thank the reviewers (Kurt S. Panter and an anonymous reviewer) for the encouraging and constructive comments and editor Mark Ghiorso for professional handling of the manuscript. We are grateful for the various FINNARP research expeditions that enabled the collection of the studied samples from these very remote areas; Mika R?is?nen is especially thanked for providing many of the samples, which he studied in relation to his MSc Thesis. The staff of the Peter Hooper GeoAnalytical Lab of the Washington State University is thanked for the major element and trace element analyses and for the help and guidance in sample preparation on site. We are also very grateful to John Lassiter and the staff at the Isotope Geochemistry labs of the Department of Geological Sciences, University of Texas at Austin, for providing swift and high-precision Nd isotopic analyses. J. Heinonen wants to thank Melissa Scruggs for the feedback and suggestions she provided for this study in its infant stages. The research has highly benefited from the funding provided by the Academy of Finland Grants 295129 and 305663. W. Bohrson thanks the National Science Foundation for supporting development of the modeling tools used in this study. Heinonen , J S , Luttinen , A V , Spera , F J , Vuori , S K & Bohrson , W A 2021 , ' Serial interaction of primitive magmas with felsic and mafic crust recorded by gabbroic dikes from the Antarctic extension of the Karoo large igneous province ' , Contributions to Mineralogy and Petrology , vol. 176 , no. 4 , 28 . https://doi.org/10.1007/s00410-021-01777-6 ORCID: /0000-0002-3129-0392/work/92659666 ORCID: /0000-0001-8998-4357/work/160774827 http://hdl.handle.net/10138/329297 2da18d29-9e61-413a-85fb-429bc8afaafb 000635135400001 info:eu-repo/semantics/openAccess openAccess Assimilation Differentiation Large igneous provinces Magmatism Modeling Geosciences Article publishedVersion 2021 ftunivhelsihelda 2024-06-04T14:34:43Z Two subvertical gabbroic dikes with widths of similar to 350 m (East-Muren) and >= 500 m (West-Muren) crosscut continental flood basalts in the Antarctic extension of the similar to 180 Ma Karoo large igneous province (LIP) in Vestfjella, western Dronning Maud Land. The dikes exhibit unusual geochemical profiles; most significantly, initial (at 180 Ma) epsilon(Nd) values increase from the dike interiors towards the hornfelsed wallrock basalts (from - 15.3 to - 7.8 in East-Muren and more gradually from - 9.0 to - 5.5 in West-Muren). In this study, we utilize models of partial melting and energy-constrained assimilation-fractional crystallization in deciphering the magmatic evolution of the dikes and their contact aureoles. The modeling indicates that both gabbroic dikes acquired the distinctly negative epsilon(Nd) values recorded by their central parts by varying degrees of assimilation of Archean crust at depth. This first phase of deep contamination was followed by a second event at or close to the emplacement level and is related to the interaction of the magmas with the wallrock basalts. These basalts belong to a distinct Karoo LIP magma type having initial epsilon(Nd) from - 2.1 to + 2.5, which provides a stark contrast to the epsilon(Nd) composition of the dike parental magmas (- 15.3 for East-Muren, - 9.0 for West-Muren) previously contaminated by Archean crust. For East-Muren, the distal hornfelses represent partially melted wallrock basalts and the proximal contact zones represent hybrids of such residues with differentiated melts from the intrusion; the magmas that were contaminated by the partial melts of the wallrock basalts were likely transported away from the currently exposed parts of the conduit before the magma-wallrock contact was sealed and further assimilation prevented. In contrast, for West-Muren, the assimilation of the wallrock basalt partial melts is recorded by the gradually increasing epsilon(Nd) of the presently exposed gabbroic rocks towards the roof contact with the basalts. Our ... Article in Journal/Newspaper Antarc* Antarctic Dronning Maud Land HELDA – University of Helsinki Open Repository Antarctic The Antarctic Dronning Maud Land Vestfjella ENVELOPE(-14.000,-14.000,-73.167,-73.167) Muren ENVELOPE(-15.000,-15.000,-73.733,-73.733) Contributions to Mineralogy and Petrology 176 4 |