Relationship between bowl-shaped clastic injectites and parent sand depletion: implications for their scale-invariant morphology and composition

Cobain, SL; Hodgson, David M.; Peakall, Jeff; Silcock, SY

doi:10.1144/sp493-2018-80

2019

DOI: 10.1144/sp493-2018-80

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Relationship between bowl-shaped clastic injectites and parent sand depletion: implications for their scale-invariant morphology and composition

SL Cobain

David M. Hodgson

Jeff Peakall

et al.

Abstract: This is a repository copy of Relationship between bowl-shaped clastic injectites and parent sand depletion; implications for their scale invariant morphology and composition.

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2021

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Sedimentological responses to initial continental collision: triggering of sand injection and onset of mass movement in a syn-collisional trench basin, Saga, southern Tibet

Liu

Kneller

et al. 2021

JGS

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A continuous Late Cretaceous-Paleocene sedimentary succession within the India-Asia collision suture zone in Xigaze, Tibet, contains a c. 80 m thick sand injection complex immediately overlain by a c. 60 m thick mass transport deposit (MTD, the first of several) with the first evidence of Asian provenance, and immediately followed by a ∼61 Ma tuff. The youngest in situ strata with unequivocal Indian provenance are probably the source beds of the sand intrusions, separated from the first MTD by c. 50 m of pelagic deposits that potentially represent an interval of several million years; the collision could thus have occurred at any time within this interval. However, the uppermost limit of the sand intrusions closely coinciding with the MTD suggests that they occurred penecontemporaneously, possibly associated with initial continental collision. This may provide additional constraint of initial collision onset at c. 61 Ma. Co-occurrence of MTDs and sand injections are possibly good sedimentary indicators of continental collision onset and characteristic of syn-collisional trench basins. Since neither the youngest Indian nor the oldest Asian provenance sediments are in their original stratigraphic position, this study shows that detailed sedimentological work combined with provenance study can better constrain the timing of continental collision.

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Sedimentological responses to initial continental collision: triggering of sand injection and onset of mass movement in a syn-collisional trench basin, Saga, southern Tibet

Liu

Kneller

et al. 2021

JGS

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Introduction: subsurface sand remobilization and injection

Hurst

Grippa

Silcock

et al. 2021

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Observation of basin-scale networks of sandstone intrusions are described from subsurface studies and outcrop locations. Regional scale studies are prevalent in the volume and two new regionally significant subsurface sand injection complexes are described. Higher resolution studies, both outcrop and subsurface, show the small-scale complexity but high level of connectedness of sandstone intrusions. Discordance with bedding at all scales is diagnostic of sandstone intrusions. The propensity of hydraulic fractures to develop and fill with fluidised sand in a broad range of host rocks is demonstrated by examples from metamorphic and magmatic basement, and lignite. Terminology used to describe sandstone intrusions and other elements of sand injection complexes is diverse.

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Relationship between bowl-shaped clastic injectites and parent sand depletion: implications for their scale-invariant morphology and composition

Abstract: This is a repository copy of Relationship between bowl-shaped clastic injectites and parent sand depletion; implications for their scale invariant morphology and composition.

Cited by 2 publications

References 54 publications

Sedimentological responses to initial continental collision: triggering of sand injection and onset of mass movement in a syn-collisional trench basin, Saga, southern Tibet

Sedimentological responses to initial continental collision: triggering of sand injection and onset of mass movement in a syn-collisional trench basin, Saga, southern Tibet

Introduction: subsurface sand remobilization and injection

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