Evolution and Morphology of Rafted Blocks in An Ancient Deepwater Mass Transport Complex (Exmouth Plateau, Offshore Nw Australia)

Eruteya, Ovie Emmanuel, Niyazi, Yakufu, Omosanya, Kamaldeen Olakunle, Ierodiaconou, Daniel and Moscariello, Andrea 2020, Evolution and Morphology of Rafted Blocks in An Ancient Deepwater Mass Transport Complex (Exmouth Plateau, Offshore Nw Australia), Interpretation, vol. 8, no. 4, pp. 1-20, doi: 10.1190/int-2020-0067.1.

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Title Evolution and Morphology of Rafted Blocks in An Ancient Deepwater Mass Transport Complex (Exmouth Plateau, Offshore Nw Australia)
Author(s) Eruteya, Ovie Emmanuel
Niyazi, Yakufu
Omosanya, Kamaldeen Olakunle
Ierodiaconou, DanielORCID iD for Ierodiaconou, Daniel orcid.org/0000-0002-7832-4801
Moscariello, Andrea
Journal name Interpretation
Volume number 8
Issue number 4
Start page 1
End page 20
Total pages 20
Publisher Society of Exploration Geophysicists
Place of publication Tulsa, Okla.
Publication date 2020-11
ISSN 2324-8858
Summary Submarine mass wasting plays a fundamental role in transporting substantial volumes of sediments basinward including gigantic slide blocks. However, the understanding of processes involved in block generation and their associated deformation until flow arrest remains limited, especially in data-starved deep-water settings. Here a 2D and 3D seismic reflection data from the Exmouth Plateau, offshore NW Australia is used to investigate the architecture of large blocks preserved within an ancient mass transport complex (MTC) and their interaction with the basal shear surface (BSS). The evolution of the investigated MTC (MTC-BDF) is related to instability along the flanks of an underlying bifurcative Miocene canyon. MTC-BDF spans ∼75 km by ∼35 km containing at least 32 well-imaged blocks (within the 3D seismic coverage) encapsulated in a well-deformed debrite background. These carbonate blocks interpreted as rafted blocks have lengths ranging from 0.48 km to 3.40 km with thicknesses reaching up to 165 m. Interestingly, the blocks are more abundant in a region characterized by moderate-high amplitude debrites. Erosional morphologies encompassing a unique groove and other circular to irregular-shaped depressions mapped along the BSS provide evidence for the erosive nature of the flow. The origin of the groove is related transported blocks gouging the BSS. Importantly, intra block deformations recorded within these blocks as fault and fold systems suggest a complex flow regime within MTC-BDF, with the deformations arising either during block translation or also possibly upon the arrest of the failed mass in interaction with bathymetric elements. Our findings suggest inherent deformations within these blocks may serve as high-permeability conduits with implications for deep-water drilling operations within this segment of the Exmouth Plateau and elsewhere in other hydrocarbon-rich deep-water settings.
Notes Just-Accepted Article
Language eng
DOI 10.1190/int-2020-0067.1
Indigenous content off
Field of Research 0404 Geophysics
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Persistent URL http://hdl.handle.net/10536/DRO/DU:30144667

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