Magnetic and plagioclase linear fabric discrepancy in dykes: a new way to define the flow vector using magnetic foliation
In basaltic dykes the magnetic lineation K1 (maximum magnetic susceptibility axis) is generally taken to indicate the flow direction during solidification of the magma. This assumption was tested in Tertiary basaltic dykes from Greenland displaying independent evidence of subhorizontal flow. The dig...
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crwiley:10.1046/j.1365-3121.2002.00412.x 2024-09-15T18:09:38+00:00 Magnetic and plagioclase linear fabric discrepancy in dykes: a new way to define the flow vector using magnetic foliation Geoffroy, L. Callot, J. P. Aubourg, C. Moreira, M. 2002 http://dx.doi.org/10.1046/j.1365-3121.2002.00412.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3121.2002.00412.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3121.2002.00412.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Terra Nova volume 14, issue 3, page 183-190 ISSN 0954-4879 1365-3121 journal-article 2002 crwiley https://doi.org/10.1046/j.1365-3121.2002.00412.x 2024-08-30T04:08:58Z In basaltic dykes the magnetic lineation K1 (maximum magnetic susceptibility axis) is generally taken to indicate the flow direction during solidification of the magma. This assumption was tested in Tertiary basaltic dykes from Greenland displaying independent evidence of subhorizontal flow. The digital processing of microphotographs from thin sections cut in (K1, K2) planes yields the preferred linear orientation of plagioclase, which apparently marks the magma flow lineation. In up to 60% of cases, the angular separation between K1 and the assumed flow direction is greater than 45°. This suggests that the uncorroborated use of magnetic lineations in dykes is risky. A simple geometrical method is proposed to infer the flow vector from AMS in dykes based solely on magnetic foliations. Article in Journal/Newspaper Greenland Wiley Online Library Terra Nova 14 3 183 190 |
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Open Polar |
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Wiley Online Library |
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crwiley |
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English |
description |
In basaltic dykes the magnetic lineation K1 (maximum magnetic susceptibility axis) is generally taken to indicate the flow direction during solidification of the magma. This assumption was tested in Tertiary basaltic dykes from Greenland displaying independent evidence of subhorizontal flow. The digital processing of microphotographs from thin sections cut in (K1, K2) planes yields the preferred linear orientation of plagioclase, which apparently marks the magma flow lineation. In up to 60% of cases, the angular separation between K1 and the assumed flow direction is greater than 45°. This suggests that the uncorroborated use of magnetic lineations in dykes is risky. A simple geometrical method is proposed to infer the flow vector from AMS in dykes based solely on magnetic foliations. |
format |
Article in Journal/Newspaper |
author |
Geoffroy, L. Callot, J. P. Aubourg, C. Moreira, M. |
spellingShingle |
Geoffroy, L. Callot, J. P. Aubourg, C. Moreira, M. Magnetic and plagioclase linear fabric discrepancy in dykes: a new way to define the flow vector using magnetic foliation |
author_facet |
Geoffroy, L. Callot, J. P. Aubourg, C. Moreira, M. |
author_sort |
Geoffroy, L. |
title |
Magnetic and plagioclase linear fabric discrepancy in dykes: a new way to define the flow vector using magnetic foliation |
title_short |
Magnetic and plagioclase linear fabric discrepancy in dykes: a new way to define the flow vector using magnetic foliation |
title_full |
Magnetic and plagioclase linear fabric discrepancy in dykes: a new way to define the flow vector using magnetic foliation |
title_fullStr |
Magnetic and plagioclase linear fabric discrepancy in dykes: a new way to define the flow vector using magnetic foliation |
title_full_unstemmed |
Magnetic and plagioclase linear fabric discrepancy in dykes: a new way to define the flow vector using magnetic foliation |
title_sort |
magnetic and plagioclase linear fabric discrepancy in dykes: a new way to define the flow vector using magnetic foliation |
publisher |
Wiley |
publishDate |
2002 |
url |
http://dx.doi.org/10.1046/j.1365-3121.2002.00412.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3121.2002.00412.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3121.2002.00412.x |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Terra Nova volume 14, issue 3, page 183-190 ISSN 0954-4879 1365-3121 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-3121.2002.00412.x |
container_title |
Terra Nova |
container_volume |
14 |
container_issue |
3 |
container_start_page |
183 |
op_container_end_page |
190 |
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1810447216670670848 |