Petrophysical and consolidation behavior of mass transport deposits from the northern Gulf of Mexico, IODP Expedition 308

Dugan, Brandon

doi:10.1016/j.margeo.2012.05.001

Cited by 44 publications

(55 citation statements)

References 32 publications

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“…Sediments with gas hydrates could have high or low shear strength depending on whether hydrate has dissociated during coring and retrieval [Waite et al, 2009]. Deposits of past landslides will have elevated shear strength [Sawyer et al, 2009;Dugan, 2012]. Erosion of overburden will lead to higher shear strength of the unroofed sediments [Kitajima and Saffer, 2014].…”

Section: Resultsmentioning

confidence: 99%

Elevated shear strength of sediments on active margins: Evidence for seismic strengthening

Sawyer

DeVore

2015

Geophysical Research Letters

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Earthquakes are a primary trigger of submarine landslides, yet some of the most seismically active areas on Earth show a surprisingly low frequency of submarine landslides. Here we show that within the uppermost 100 m below seafloor (mbsf) in previously unfailed sediment, active margins have elevated shear strength by a factor of 2–3 relative to the same interval on passive margins. The elevated shear strength is seen in a global survey of undrained shear strength with depth as well as a normalized analysis that accounts for lithology and stress state. The enhanced shear strength is highest within the uppermost 10 mbsf. These results indicate that large areas of modern day slopes on active margins have enhanced slope stability, which may explain the relative paucity of landslides. These findings lend support to the seismic strengthening hypothesis that the repeated exposure to earthquake energy gradually increases shear strength by shear‐induced compaction.

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Section: Resultsmentioning

confidence: 99%

Elevated shear strength of sediments on active margins: Evidence for seismic strengthening

Sawyer

DeVore

2015

Geophysical Research Letters

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“…This has been confirmed by identifying losses in porosity and water content in failed sediment (Piper et al, ; Shipp et al, ), by core observations (Strasser et al, ; Tripsanas et al, ), and by observations of trapped free gas underneath failed material (Sun, Alves, et al, ). Multiple DSDP/ODP/IODP wells have been drilled through failed sediment (e.g., Dugan, ; Piper et al, ; Strasser et al, ). Amongst them, only a few wells with robust evidence for similar depositional environments to the study area are used in this work (see Table S1).…”

Section: Volume Lost By Shear Compactionmentioning

confidence: 99%

True Volumes of Slope Failure Estimated From a Quaternary Mass‐Transport Deposit in the Northern South China Sea

Sun

Alves

et al. 2018

Geophysical Research Letters

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Submarine slope failure can mobilize large amounts of seafloor sediment, as shown in varied offshore locations around the world. Submarine landslide volumes are usually estimated by mapping their tops and bases on seismic data. However, two essential components of the total volume of failed sediments are overlooked in most estimates: (a) the volume of subseismic turbidites generated during slope failure and (b) the volume of shear compaction occurring during the emplacement of failed sediment. In this study, the true volume of a large submarine landslide in the northern South China Sea is estimated using seismic, multibeam bathymetry and Ocean Drilling Program/Integrated Ocean Drilling Program well data. The submarine landslide was evacuated on the continental slope and deposited in an ocean basin connected to the slope through a narrow moat. This particular character of the sea floor provides an opportunity to estimate the amount of strata remobilized by slope instability. The imaged volume of the studied landslide is ~1035 ± 64 km3, ~406 ± 28 km3 on the slope and ~629 ± 36 km3 in the ocean basin. The volume of subseismic turbidites is ~86 km3 (median value), and the volume of shear compaction is ~100 km3, which are ~8.6% and ~9.7% of the landslide volume imaged on seismic data, respectively. This study highlights that the original volume of the failed sediments is significantly larger than that estimated using seismic and bathymetric data. Volume loss related to the generation of landslide‐related turbidites and shear compaction must be considered when estimating the total volume of failed strata in the submarine realm.

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“…). Consequently, the bsz is believed to accumulate most of the strain/deformation during mass transport and emplacement (Middleton & Hampton et al., ; Ineson, ; Tripsanas et al., ; De Blasio et al., 2004a, 2004b; Dugan, ; Ogata et al., , ; Yamamoto & Sawyer, ; Day‐Stirrat et al., ; Kitamura et al., ; Festa et al., ; Cardona et al., ). The deformation observed in the bsz is not limited to the failed material within the mass flow, but can also progressively extend into the underlying deposits (Ogata et al., ; Valdez Buso et al., ; Sobiesiak et al., ), in a similar manner as a fault damage zone ( sensu Yielding et al., ).…”

Section: Introductionmentioning

confidence: 99%

“…). Understanding this zone of localized strain in MTDs can have important implications for fluid flow studies (Sawyer et al., ; Dugan, ; Day‐Stirrat et al., ) and for assessment of these deposits as hydrocarbon seals (Frey‐Martínez, ; Aplin & Macquaker, ; Cardona et al., ).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the Rapanui mass‐transport deposit and the basal shear zone: Mount Messenger Formation, Taranaki Basin, New Zealand

et al. 2020

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Submarine mass-transport deposits are important in many ancient and modern basins. Mass-transport deposits can play a significant role in exploration as reservoir, seal or source units. Although seismic data has advanced the knowledge about these deposits, more outcrop studies are needed to better understand gravity mass flows and predict the properties of their resultant deposits. It is proposed that sufficiently well-exposed outcrops of mass-transport deposits can be divided into three strain-dominant morphodomains: headwall, translational and toe. The outcrops of the Rapanui mass-transport deposit, part of the Lower Mount Messenger Formation in the Taranaki Basin, New Zealand, are exposed along a ca 4 km transect in coastal cliffs that enable the identification of the three morphodomains. The aim of this study is to characterize the stratigraphic and sedimentological nature of the Miocene-age Rapanui mass-transport deposit outcrops and the evolution of its basal shear zone. The basal shear zone of a mass-transport deposit is defined as the stratal zone formed in the interface between the overriding mass flow and the underlying in situ deposits or sea floor. Accordingly, the deformation structures in the Rapanui mass-transport deposit and the basal shear zone were documented in an established spatial framework. Traditional methodologies were used to characterize the sedimentology of the Rapanui mass-transport deposit. Data collected from intrafolial folds, rafted blocks and samples from the Rapanui mass-transport deposit were used to investigate strain and matrix texture evolution, estimate palaeoflow direction, and calculate yield strength and overpressure at time of deposition. Additionally, a one-dimensional numerical model was used to test sedimentation-driven overpressure as probable trigger. This work demonstrates that the basal shear zone, as well as the matrix texture of a mass-transport deposit, can vary spatially as sediments from underlying deposits are entrained during shear-derived mixing. This phenomenon can impact the seal potential of mass-transport deposits and their interaction with fluids in the subsurface.

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Petrophysical and consolidation behavior of mass transport deposits from the northern Gulf of Mexico, IODP Expedition 308

Cited by 44 publications

References 32 publications

Elevated shear strength of sediments on active margins: Evidence for seismic strengthening

Elevated shear strength of sediments on active margins: Evidence for seismic strengthening

True Volumes of Slope Failure Estimated From a Quaternary Mass‐Transport Deposit in the Northern South China Sea

Characterization of the Rapanui mass‐transport deposit and the basal shear zone: Mount Messenger Formation, Taranaki Basin, New Zealand

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