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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, Alex ORCID: https://orcid.org/0000-0003-2208-0075; Macpherson, C.G.; Muraszko, J.R.; Harrison, R.J; Jordan, Tom A. ORCID: https://orcid.org/0000-0003-2780-1986. 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

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This is a post-print of an article published in Journal of Structural Geology. The final published version is available online at: https://doi.org/10.1016/j.jsg.2018.11.014
V2 J Structural Geo Submission - For Durham.pdf - Accepted Version
Restricted to NORA staff only until February 2020.
Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0.

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Abstract/Summary

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.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1016/j.jsg.2018.11.014
ISSN: 0191-8141
Additional Keywords: tectonics, magnetic fabrics, magmatic fabrics, intrusions; granites; SE Asia; Mt Kinabalu
Date made live: 14 Feb 2019 11:29 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/521776

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