Orthogonal switching of AMS axes during type-2 fold interference : Insights from integrated X-ray computed tomography, AMS and 3D petrography
We applied X-ray computed microtomography (μ-CT) in combination with anisotropy of magnetic susceptibility (AMS) analysis to study metamorphic rock fabrics in an oriented drill core sample of pyrite-pyrrhotite-quartz-mica schist. The sample is extracted from the Paleoproterozoic Martimo metasediment...
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ftjyvaeskylaenun:oai:jyx.jyu.fi:123456789/55465 2024-02-04T10:03:14+01:00 Orthogonal switching of AMS axes during type-2 fold interference : Insights from integrated X-ray computed tomography, AMS and 3D petrography Sayab, Mohammad Miettinen, Arttu Aerden, Domingo Karell, Fredrik 2017 1-16 application/pdf http://urn.fi/URN:NBN:fi:jyu-201709273844 eng eng Pergamon Press Journal of Structural Geology 0191-8141 0 103 10.1016/j.jsg.2017.09.002 Sayab, M., Miettinen, A., Aerden, D., & Karell, F. (2017). Orthogonal switching of AMS axes during type-2 fold interference : Insights from integrated X-ray computed tomography, AMS and 3D petrography. Journal of Structural Geology , 103 , 1-16. https://doi.org/10.1016/j.jsg.2017.09.002 CONVID_27202451 TUTKAID_74892 URN:NBN:fi:jyu-201709273844 http://urn.fi/URN:NBN:fi:jyu-201709273844 © 2017 Elsevier Ltd. This is a final draft version of an article whose final and definitive form has been published by Pergamon Press. Published in this repository with the kind permission of the publisher. openAccess microtomography AMS microtectonics magnetic fabric pyrrhotite rasitus article http://purl.org/eprint/type/JournalArticle http://purl.org/coar/resource_type/c_2df8fbb1 acceptedVersion A1 2017 ftjyvaeskylaenun 2024-01-11T00:03:31Z We applied X-ray computed microtomography (μ-CT) in combination with anisotropy of magnetic susceptibility (AMS) analysis to study metamorphic rock fabrics in an oriented drill core sample of pyrite-pyrrhotite-quartz-mica schist. The sample is extracted from the Paleoproterozoic Martimo metasedimentary belt of northern Finland. The μ-CT resolves the spatial distribution, shape and orientation of 25,920 pyrrhotite and 153 pyrite grains localized in mm-thick metapelitic laminae. Together with microstructural analysis, the μ-CT allows us to interpret the prolate symmetry of the AMS ellipsoid and its relationship to the deformation history. AMS of the sample is controlled by pyrrhotite porphyroblasts that grew syntectonically during D1 in subhorizontal microlithons. The short and intermediate axes (K3 and K2) of the AMS ellipsoid interchanged positions during a subsequent deformation (D2) that intensely crenulated S1 and deformed pyrrhotite, while the long axes (K1) maintained a constant position parallel to the maximum stretching direction. However, it is likely that all the three AMS axes switched, similar to the three principal axes of the shape ellipsoid of pyrite porphyroblasts from D1 to D2. The superposition of D1 and D2 produced a type-2 fold interference pattern. peerReviewed Article in Journal/Newspaper Northern Finland JYX - Jyväskylä University Digital Archive Martimo ENVELOPE(23.900,23.900,66.173,66.173) Journal of Structural Geology 103 1 16 |
institution |
Open Polar |
collection |
JYX - Jyväskylä University Digital Archive |
op_collection_id |
ftjyvaeskylaenun |
language |
English |
topic |
microtomography AMS microtectonics magnetic fabric pyrrhotite rasitus |
spellingShingle |
microtomography AMS microtectonics magnetic fabric pyrrhotite rasitus Sayab, Mohammad Miettinen, Arttu Aerden, Domingo Karell, Fredrik Orthogonal switching of AMS axes during type-2 fold interference : Insights from integrated X-ray computed tomography, AMS and 3D petrography |
topic_facet |
microtomography AMS microtectonics magnetic fabric pyrrhotite rasitus |
description |
We applied X-ray computed microtomography (μ-CT) in combination with anisotropy of magnetic susceptibility (AMS) analysis to study metamorphic rock fabrics in an oriented drill core sample of pyrite-pyrrhotite-quartz-mica schist. The sample is extracted from the Paleoproterozoic Martimo metasedimentary belt of northern Finland. The μ-CT resolves the spatial distribution, shape and orientation of 25,920 pyrrhotite and 153 pyrite grains localized in mm-thick metapelitic laminae. Together with microstructural analysis, the μ-CT allows us to interpret the prolate symmetry of the AMS ellipsoid and its relationship to the deformation history. AMS of the sample is controlled by pyrrhotite porphyroblasts that grew syntectonically during D1 in subhorizontal microlithons. The short and intermediate axes (K3 and K2) of the AMS ellipsoid interchanged positions during a subsequent deformation (D2) that intensely crenulated S1 and deformed pyrrhotite, while the long axes (K1) maintained a constant position parallel to the maximum stretching direction. However, it is likely that all the three AMS axes switched, similar to the three principal axes of the shape ellipsoid of pyrite porphyroblasts from D1 to D2. The superposition of D1 and D2 produced a type-2 fold interference pattern. peerReviewed |
format |
Article in Journal/Newspaper |
author |
Sayab, Mohammad Miettinen, Arttu Aerden, Domingo Karell, Fredrik |
author_facet |
Sayab, Mohammad Miettinen, Arttu Aerden, Domingo Karell, Fredrik |
author_sort |
Sayab, Mohammad |
title |
Orthogonal switching of AMS axes during type-2 fold interference : Insights from integrated X-ray computed tomography, AMS and 3D petrography |
title_short |
Orthogonal switching of AMS axes during type-2 fold interference : Insights from integrated X-ray computed tomography, AMS and 3D petrography |
title_full |
Orthogonal switching of AMS axes during type-2 fold interference : Insights from integrated X-ray computed tomography, AMS and 3D petrography |
title_fullStr |
Orthogonal switching of AMS axes during type-2 fold interference : Insights from integrated X-ray computed tomography, AMS and 3D petrography |
title_full_unstemmed |
Orthogonal switching of AMS axes during type-2 fold interference : Insights from integrated X-ray computed tomography, AMS and 3D petrography |
title_sort |
orthogonal switching of ams axes during type-2 fold interference : insights from integrated x-ray computed tomography, ams and 3d petrography |
publisher |
Pergamon Press |
publishDate |
2017 |
url |
http://urn.fi/URN:NBN:fi:jyu-201709273844 |
long_lat |
ENVELOPE(23.900,23.900,66.173,66.173) |
geographic |
Martimo |
geographic_facet |
Martimo |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_relation |
Journal of Structural Geology 0191-8141 0 103 10.1016/j.jsg.2017.09.002 Sayab, M., Miettinen, A., Aerden, D., & Karell, F. (2017). Orthogonal switching of AMS axes during type-2 fold interference : Insights from integrated X-ray computed tomography, AMS and 3D petrography. Journal of Structural Geology , 103 , 1-16. https://doi.org/10.1016/j.jsg.2017.09.002 CONVID_27202451 TUTKAID_74892 URN:NBN:fi:jyu-201709273844 http://urn.fi/URN:NBN:fi:jyu-201709273844 |
op_rights |
© 2017 Elsevier Ltd. This is a final draft version of an article whose final and definitive form has been published by Pergamon Press. Published in this repository with the kind permission of the publisher. openAccess |
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Journal of Structural Geology |
container_volume |
103 |
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1 |
op_container_end_page |
16 |
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1789970504713502720 |