Articles | Volume 15, issue 1
Research article
08 Jan 2024
Research article |  | 08 Jan 2024

Thrusts control the thermal maturity of accreted sediments

Utsav Mannu, David Fernández-Blanco, Ayumu Miyakawa, Taras Gerya, and Masataka Kinoshita

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Subject area: Tectonic plate interactions, magma genesis, and lithosphere deformation at all scales | Editorial team: Geodynamics and quantitative modelling | Discipline: Geodynamics
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Cited articles

Akuhara, T.: Fluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula: Inferred from Receiver Function Analysis, Springer, 94 pp.,, 2018. 
Arai, R., Kodaira, S., Henrys, S., Bangs, N., Obana, K., Fujie, G., Miura, S., Barker, D., Bassett, D., Bell, R., Mochizuki, K., Kellett, R., Stucker, V., Fry, B., and NZ3D Team: Three-dimensional P wave velocity structure of the northern hikurangi margin from the NZ3D experiment: Evidence for fault-bound anisotropy, J. Geophys. Res.-Sol. Ea., 125, e2020JB020433,, 2020. 
Baig, I., Faleide, J. I., Jahren, J., and Mondol, N. H.: Cenozoic exhumation on the southwestern Barents Shelf: Estimates and uncertainties constrained from compaction and thermal maturity analyses, Mar. Petrol. Geol., 73, 105–130, 2016. 
Bostick, N. H. and Pawlewicz, M. J.: Paleotemperatures based on vitrinite reflectance of shales and limestone in igneous dike aureoles in the Upper Cretaceous Pierre shale, Walsenburg, Colorado, (last access: 30 December 2023), 1984. 
Burnham, A. K. and Sweeney, J. J.: A chemical kinetic model of vitrinite maturation and reflectance, Geochim. Cosmochim. Ac., 53, 2649–2657, 1989. 
Short summary
Accretion during subduction, in which one tectonic plate moves under another, forms a wedge where sediments can be transformed into hydrocarbons. We utilised realistic computer models to investigate this and, in particular, how accretion affects mobility in the wedge and found that the evolution of the wedge and the thrusts it develops fundamentally control the thermal maturity of sediments. This can help us better understand the history of subduction and the formation of hydrocarbons in wedges.