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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, A. and Macpherson, C.G. and Muraszko, J.R. and Harrison, R.J. and Jordan, T.A. (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 . pp. 50-60.

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1016/j.jsg.2018.11.014
Publisher statement:© 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/
Date accepted:30 November 2018
Date deposited:06 December 2018
Date of first online publication:05 December 2018
Date first made open access:05 December 2019

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