The signature of lithospheric anisotropy at post-subduction continental margins: New insight from XKS splitting analysis in Northern Borneo

C. A. Bacon and N. Rawlinson and S. Pilia and A. Gilligan and D. Wehner and D. G. Cornwell and Felix Tongkul (2022) The signature of lithospheric anisotropy at post-subduction continental margins: New insight from XKS splitting analysis in Northern Borneo. Geochemistry, Geophysics, Geosystems, 23. pp. 1-17. ISSN 1525-2027

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URL: https://agupubs.onlinelibrary.wiley.com/doi/10.102...

Abstract

The relative paucity of recent post-subduction environments globally has meant that, so far, little is known about tectonic processes that occur during and after subduction termination, as previously convergent tectonic plates adjust to the new stress regime. The region of Southeast Asia that now encompasses northern Borneo has been host to two sequential episodes of subduction—both now terminated—since the mid-Paleogene. It is expected that these processes will have left signatures in the fabric of the upper mantle, which are manifest in the form of seismic anisotropy. We investigate the evidence for, and alignment of, anisotropic fabrics by measuring the splitting of a family of teleseismic shear phases. These observations provide a measure of the orientation of the effective anisotropic elastic tensor, in the form of the orientation of the fast shear-wave polarization, ϕ, and add constraints on the strength of the anisotropic fabric, in the form of the delay time, δt. We observe two principal trends across northern Borneo that appear to be confined to the lithosphere. These patterns are likely related to tectonic processes associated with subduction, continental collision, and oceanic basin formation, events that can exert primary influence on the formation of post-subduction settings.

Item Type:	Article
Keyword:	Post-subduction, Lithospheric anisotropy, Northern Borneo
Subjects:	Q Science > Q Science (General) > Q1-390 Science (General)
Department:	FACULTY > Faculty of Science and Natural Resources
Depositing User:	DG MASNIAH AHMAD -
Date Deposited:	31 Oct 2023 11:24
Last Modified:	31 Oct 2023 11:24
URI:	https://eprints.ums.edu.my/id/eprint/37561

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