Tectonic strain recorded by magnetic fabrics (AMS) in plutons, including Mt Kinabalu, Borneo: A tool to explore past tectonic regimes and syn-magmatic deformation

Burton-Johnson, A.; Macpherson, C.G.; Muraszko, J.R.; Harrison, R.J.; Jordan, T.A.

doi:10.1016/j.jsg.2018.11.014

Tectonic strain recorded by magnetic fabrics (AMS) in plutons, including Mt Kinabalu, Borneo: A tool to explore past tectonic regimes and syn-magmatic deformation

Burton-Johnson, A.; Macpherson, C.G.; Muraszko, J.R.; Harrison, R.J.; Jordan, T.A.

Authors

A. Burton-Johnson

Professor Colin Macpherson colin.macpherson@durham.ac.uk
Professor

J.R. Muraszko

R.J. Harrison

T.A. Jordan

Abstract

Tectonic strain commonly overprints magmatic fabrics in AMS (Anisotropy of Magnetic Susceptibility) data for plutonic rocks produced by both compressional and extensional regimes. Mt Kinabalu, Borneo, is a composite pluton with an exceptional vertical range of exposure and clearly defined internal contacts. We show that tectonic fabrics are recorded pervasively throughout the intrusion, even near contacts, and present a workflow distinguishing compressive and extensional syn-magmatic deformation. At Mt Kinabalu this reveals a pervasive tectonic fabric indicating NW-SE Miocene extension in Borneo at 7.9–7.3 Ma, later than previously recognised, oriented NW-SE at 319° ±13.1°. Comparing data from Mt Kinabalu with data from globally distributed studies shows that tectonic strain is commonly recorded by plutons. Therefore, AMS fabric can be used to identify the syn-magmatic tectonic setting and combined with both geochronology and evidence for paleomagnetic rotation to provide a powerful tool for accurate determination of syn-magmatic tectonic regimes and strain orientations within temporal frameworks.

Citation

Burton-Johnson, A., Macpherson, C., Muraszko, J., Harrison, R., & Jordan, T. (2019). Tectonic strain recorded by magnetic fabrics (AMS) in plutons, including Mt Kinabalu, Borneo: A tool to explore past tectonic regimes and syn-magmatic deformation. Journal of Structural Geology, 119, 50-60. https://doi.org/10.1016/j.jsg.2018.11.014

Journal Article Type	Article
Acceptance Date	Nov 30, 2018
Online Publication Date	Dec 5, 2018
Publication Date	Feb 28, 2019
Deposit Date	Dec 6, 2018
Publicly Available Date	Dec 5, 2019
Journal	Journal of Structural Geology
Print ISSN	0191-8141
Publisher	Elsevier
Peer Reviewed	Peer Reviewed
Volume	119
Pages	50-60
DOI	https://doi.org/10.1016/j.jsg.2018.11.014

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© 2018 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/