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Ductile flow in the metamorphic rocks of central Sulawesi

By
Ian M. Watkinson
Ian M. Watkinson
SE Asia Research Group, Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK (e-mail: i.watkinson@es.rhul.ac.uk)
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Published:
January 01, 2011

Abstract

Metamorphic rocks exposed along the Palu-Koro Fault of west-central Sulawesi, Indonesia, show abundant evidence of non-coaxial ductile deformation. The deformed rocks include gneisses, amphibolites and schists, that form part of a regionally metamorphosed basement complex of Mesozoic–Precambrian Australian (Gondwanan) origin. In the Palu and Neck regions of Sulawesi, ductile shear fabrics record low-angle westward extension. Further south in the Palu valley, extension is directed towards the south and SW, along with gently-dipping ductile thrust fabrics. Vergence exceptions are common at both outcrop and kilometre scale. Cross-cutting granitic dykes place some constraint on the timing of ductile foliation formation. In the neck region of Sulawesi, it occurred before c. 44–33.7 Ma. In the central and northern Palu valley, to the south, it occurred before 5–3.5 Ma. The timing and orientation of non-coaxial strain precludes its origin as a result of Palu-Koro Fault activity. Instead, ductile flow occurred during either Eocene–Miocene mid-crustal extension above a metamorphic core complex, Cretaceous subduction-related deformation in the over-riding plate, or intracontinental deformation within Gondwana.

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Geological Society Special Publications

The SE Asian Gateway: History and Tectonics of the Australia-Asia Collision

R. Hall
R. Hall
Royal Holloway University of London, UK
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M. A. Cottam
M. A. Cottam
Royal Holloway University of London, UK
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M. E. J. Wilson
M. E. J. Wilson
Curtin University, Australia
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Geological Society of London
ISBN electronic:
9781862396036
Publication date:
January 01, 2011

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