Block generation, deformation, and interaction of mass-transport deposits with the seafloor: An outcrop‐based study of the carboniferous Paganzo Basin (Cerro Bola, NW Argentina)

Matheus S. Sobiesiak, Victoria Valdez Buso, Ben Kneller, G. Ian Alsop, Juan Pablo Milana

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Mass‐transport processes are notorious for their ability to carry large blocks or megaclasts, to deform sediments, and to interact with the seafloor through deformation and/or erosion of the substrate. These processes, together with their influence on slope sedimentation, are themes we address via direct field observation of three Carboniferous‐aged mass‐transport deposits (MTDs) (labeled I, II, and III) from Cerro Bola, NW Argentina. Internal deformation can be observed in all three MTDs, although it is best developed in MTD II, a 180 m thick vertically zoned MTD with deformation evolving upward from a simple shear dominated base to a pure shear middle zone and finally back into a simple shear dominated topmost zone. The contact between MTDs I and II and their underlying sandstone substrates are also locally deformed, with plastic deformation affecting up to ~20 m of substrate below the MTD base. Conversely, the basal contact between MTD II and the substrate is also in part erosional, marked by scours and grooves that truncate the bedding in the topmost layers of the substrate. Additionally, the presence of large blocks composed of diverse lithologies embedded within the MTDs, together with the sedimentological description of the MTD’s matrix and the aforementioned interaction with the seafloor, suggests at least two processes accountable for block generation within MTDs.

Original languageEnglish
Title of host publicationSubmarine Landslides
Subtitle of host publicationSubaqueous Mass Transport Deposits from Outcrops to Seismic Profiles
EditorsKei Ogato, Andrea Festa, Gian Andrea Pini
PublisherAGU
Chapter6
Pages91-104
Number of pages14
ISBN (Electronic)9781119500513
ISBN (Print)9781119500582
DOIs
Publication statusPublished - 22 Nov 2019

Publication series

NameGeophysical Monograph Series
PublisherAmerican Geophysical Union
ISSN (Print)0065-8448

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    Sobiesiak, M. S., Buso, V. V., Kneller, B., Alsop, G. I., & Milana, J. P. (2019). Block generation, deformation, and interaction of mass-transport deposits with the seafloor: An outcrop‐based study of the carboniferous Paganzo Basin (Cerro Bola, NW Argentina). In K. Ogato, A. Festa, & G. A. Pini (Eds.), Submarine Landslides: Subaqueous Mass Transport Deposits from Outcrops to Seismic Profiles (pp. 91-104). (Geophysical Monograph Series). AGU. https://doi.org/10.1002/9781119500513.ch6