A Triassic to Jurassic arc in north Borneo: Geochronology, geochemistry, and genesis of the Segama Valley Felsic Intrusions and the Sabah ophiolite

Burton-Johnson, A. ORCID: https://orcid.org/0000-0003-2208-0075; Macpherson, C.G.; Millar, I.L.; Whitehouse, M.J.; Ottley, C.J.; Nowell, G.M.. 2020 A Triassic to Jurassic arc in north Borneo: Geochronology, geochemistry, and genesis of the Segama Valley Felsic Intrusions and the Sabah ophiolite. Gondwana Research, 84. 229-244. https://doi.org/10.1016/j.gr.2020.03.006

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Abstract/Summary

New field, geochemical, and geochronological data from the Segama Valley Felsic Intrusions (SVFI) of Sabah, north Borneo, shows them to be arc-derived tonalites; not windows or partial melts of a crystalline basement beneath Sabah. U-Pb zircon ages date emplacement in the Triassic and Jurassic: 241.1 ± 2.0 Ma, 250.7 ± 1.9 Ma, 178.7 ± 2.4 Ma, and 178.6 ± 1.3 Ma; contemporaneous with peaks in magmatism and detrital zircons in Sarawak and west Kalimantan (west Borneo). Isotopic data for Sr, Nd, and Pb from whole rocks, and for Hf and O from zircon all show mantle and/or MORB affinities indicating a mantle-derived origin. Enrichment of fluid mobile trace elements and trace element ratios indicate that the most likely setting for this is in a continuation of the Sundaland continental arc. There is no evidence in the field, geochemical, or zircon U-Pb data for continental basement in the Segama Valley region.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.gr.2020.03.006
ISSN:	1342-937X
Additional Keywords:	SE Asia, Borneo, Tectonics, ophiolite, Paleo-Pacific
Date made live:	13 Jul 2020 11:16 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/525773

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