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. ISSN 01918141 DOI https://doi.org/10.1016/j.jsg.2018.11.014

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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
Uncontrolled Keywords:	2018AREP
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences 12 - PhD
Journal or Publication Title:	Journal of Structural Geology
Volume:	119
Page Range:	pp. 50-60
Identification Number:	https://doi.org/10.1016/j.jsg.2018.11.014
Depositing User:	Sarah Humbert
Date Deposited:	21 Feb 2019 18:20
Last Modified:	21 Feb 2019 18:20
URI:	http://eprints.esc.cam.ac.uk/id/eprint/4427

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