Title :

Shelf-derived mass-transport deposits: origin and significance in the stratigraphic development of trench-slope basins

Author(s) :

Claussmann, Barbara [Auteur]
Bassins - Réservoirs - Ressources - U2R UPJV-UNIL 7511 [B2R]
Schlumberger
Bailleul, Julien [Auteur]
Bassins - Réservoirs - Ressources - U2R UPJV-UNIL 7511 [B2R]
Chanier, Frank [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Mahieux, Geoffroy [Auteur]
Bassins - Réservoirs - Ressources - U2R UPJV-UNIL 7511 [B2R]
Caron, Vincent [Auteur]
Bassins - Réservoirs - Ressources - U2R UPJV-UNIL 7511 [B2R]
Mcarthur, Adam D. [Auteur]
University of Leeds
Chaptal, Corentin [Auteur]
Bassins - Réservoirs - Ressources - U2R UPJV-UNIL 7511 [B2R]
Morgans, Hugh E. G. [Auteur]
GNS Science [Lower Hutt]
Vendeville, Bruno C. [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]

Journal title :

New Zealand Journal of Geology and Geophysics
Special issue: Sedimentary systems of the Hikurangi Subduction Margin

Pages :

17-52

Publisher :

Taylor & Francis

Publication date :

2022

ISSN :

0028-8306

English keyword(s) :

active margin
shelf failure
intra-slope basins
mass-wasting deposits
outcrop study
tectonics

HAL domain(s) :

Planète et Univers [physics]/Sciences de la Terre/Géologie appliquée
Planète et Univers [physics]/Sciences de la Terre/Stratigraphie
Planète et Univers [physics]/Sciences de la Terre/Tectonique

English abstract : [en]

Continental shelves generally supply large-scale mass-wasting events. Yet, the origin and significance of shelf-derived mass-transport deposits (MTDs) for the tectonostratigraphic evolution of subduction complexes and their ...
Show more >Continental shelves generally supply large-scale mass-wasting events. Yet, the origin and significance of shelf-derived mass-transport deposits (MTDs) for the tectonostratigraphic evolution of subduction complexes and their trench-slope basins have not been extensively studied. Here, we present high-resolution, outcrop-scale insights on both the nature of the reworked sediments, and their mechanisms of development and emplacement along tectonically active margins, by examining the Middle Miocene shelf-derived MTDs outcropping in the exhumed southern portion of the Hikurangi subduction margin. Results show that periods of repeated tectonic activity (thrust propagation, uplift) in such compressional settings not only affect and control the development of shelfal environments but also drive the recurrent generation and destruction of oversteepened slopes, which in turn, favour the destabilisation and collapses of the shelves and their substratum. Here, these events produced both large-scale, shelf-derived sediment mass-failures and local debris flows, which eventually broke down into a series of coalescing, erosive, genetically linked surging flows downslope. The associated MTDs have a regional footprint, being deposited across several trench-slope basins. Recognition of tectonic activity as another causal mechanism for large-scale shelf failure (in addition to sea-level changes, high-sedimentation fluxes) has implications for both stratigraphic predictions and understanding the tectonostratigraphic evolution of deep-marine fold-and-thrust belts.Show less >

Language :

Anglais

Popular science :

Non

Comment :

The data that support the findings of this study are openly available in figshare at: https://figshare.com/articles/journal_contribution/Claussmann_et_al_NZJGG_Supplementary_material/13614101

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL