MTD distribution on a ‘passive’ continental margin: The Espírito Santo Basin (SE Brazil) during the Palaeogene

Gamboa, Davide; Alves, Tiago Marcos; Cartwright, Joseph Albert; Terrinha, Pedro

doi:10.1016/j.marpetgeo.2010.05.008

Cited by 79 publications

(62 citation statements)

References 47 publications

(77 reference statements)

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“…Schlumberger Modified after Fiduk et al (2004) and Gamboa et al (2010). showing the distribution of faults in the studied minibasin.…”

Section: Acknowledgementsmentioning

confidence: 99%

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Bi-modal deformation styles in confined mass-transport deposits: Examples from a salt minibasin in SE Brazil

Gamboa

Alves

2016

Marine Geology

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High-quality 3D seismic data reveal bi-modal deformation styles in mass-transport deposits filling a salt minibasin in SE Brazil (Espírito Santo Basin). We analyse three mass-transport deposits within the same Miocene stratigraphic interval, and four other in Holocene strata. Our interpretation reveals that deformation in the mass-transport deposits relates to their long-axis orientation. As a result, masstransport deposits are divided in two types: a) Type 1 have long axes parallel to the direction of movement and show significant internal deformation; b) Type 2 have long axes perpendicular to the direction of movement, are highly heterogeneous and include large undeformed slabs. The long axes of Type 2 mass-transport deposits are parallel to the strike of bounding faults and salt structures. The majority of mass-transport deposits show intense deformation at their headwalls, and relative short remobilisation distances are inferred for both Types 1 and 2. In the study area, the timing of emplacement of mass-transport deposits was controlled by the growth of adjacent salt ridges. Earlier halokinesis in the northern axial areas of the minibasin shifted southwards in a second stage. In contrast, Holocene mass-transport deposits suggest alternating growth of the eastern and western salt ridges. Our results show that detailed seismic-stratigraphic analyses are key to understand the timings 2 and magnitude of deformation of mass-transport deposits in salt minibasins. The classification proposed can be applied to MTDs on continental margins and in lacustrine settings.

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“…Schlumberger Modified after Fiduk et al (2004) and Gamboa et al (2010). showing the distribution of faults in the studied minibasin.…”

Section: Acknowledgementsmentioning

confidence: 99%

“…In parallel to submarine channel 5 incision, recurrent mass-wasting events led to the deposition of thick and laterally continuous MTDs in proximal and mid-slope parts of Espírito Santo (Fig. 2) (Gamboa et al, 2010;Omosanya and Alves, 2013a).…”

Section: Espírito Santo Basinmentioning

confidence: 99%

Bi-modal deformation styles in confined mass-transport deposits: Examples from a salt minibasin in SE Brazil

Gamboa

Alves

2016

Marine Geology

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“…It is associated with the uplift of coastal mountains, reactivation of rift structures, and episodic magmatic activity including the emplacement of volcanic Abrolhos Bank to the north of the study area (Cordani 1970;Demercian et al 1993;Cobbold et al 2001;Mohriak 2005;Mohriak et al 2008). This megasequence is characterized by the deposition of recurrent MTDs (Omosanya and Alves 2013;Gamboa et al 2010), together with turbiditic channels and lobes, which were sourced from the Abrolhos Bank and inland rivers (Bruhn and Walker 1997;Davison 1999;Alves et al 2009;Gamboa and Alves 2015).…”

Section: Tectono-sedimentary Evolution Of the Espírito Santo Basinmentioning

confidence: 99%

“…These two ridges delimit a salt-withdrawal basin, within which the Rio Doce Canyon System developed (Alves et al 2009;Gamboa and Alves 2015). The relative location and movement of the salt diapirs have a strong effect on the stratigraphic architecture of the study area, controlling the deposition of MTDs, turbidite lobes, submarine canyons and channels (Baudon and Cartwright 2008;Alves et al 2009;Gamboa et al 2010;Gamboa et al 2012;Gamboa and Alves 2015). For example, some of the MTDs were derived from the flanks of salt diapirs, i.e., they are detached MTDs associated with salt deformation (Omosanya and Alves 2013).…”

Section: Salt Tectonics In the Espírito Santo Basinmentioning

confidence: 99%

The Role of Mass Wasting In the Progressive Development Of Submarine Channels (Espírito Santo Basin, Se Brazil)

Qin

Alves

Constantine

et al. 2017

Journal of Sedimentary Research

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ABSTRACT:A Pliocene-Quaternary submarine channel system, influenced by a localized mass wasting, is investigated in this work using high-resolution 3D seismic data from offshore Espírito Santo Basin, SE Brazil. Three abandoned channels, a channel belt and an mass-transport deposit (MTD) are recognized in the channel system within a confluence region confined by salt diapirs. In this confluence region, the cross-sectional area (CSA) of the channel system can be up to 1.2 km 2 , i.e., 4 to 10 times larger than CSA in other parts of the channel system. Such significant changes in the architecture and morphology of the channel system resulted from the interaction between mass-wasting processes and turbidity flows. We postulate that a basal erosional scar was created by mass-wasting processes and was filled with an MTD. This basal scar was then used as a preferential pathway for turbidity flows, which were captured by its headwall and lateral margins. The interpreted data shows that the captured turbidity flows greatly widened the basal scar, but caused only small modifications in scar height. Part of the MTD within the basal scar was removed downslope by turbidity flows, and was replaced by channel-fill deposits. This paper shows a flow-capture process occurred in a confluence region on continental slope. Basal scars can capture turbidity flows and facilitate flow channelization, which is a key process for submarine-channel initiation. The replacement of MTD by channel-fill deposits has profound implications for reservoir volumes and net-to-gross ratios in channel systems and partly depends on the turbidity-flows properties, such as their erosive ability and frequency. The more erosive and frequent flows are captured by the basal scar, the larger is the accommodation space created for succeeding sand-prone turbidites.

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“…Mass Transport Deposits (MTDs) provide constraints to understanding physical processes involved in failure development (see Part V) but also have significant implications in sequence stratigraphy (Beaubouef and Abreu 2010) and non-renewable energy resource exploration and production (Posamentier and Kolla 2003;Weimer and Shipp 2004;Gamboa et al 2010). MTDs can be investigated at different scales, ranging from margin-wide tectono-or sequence-stratigraphic considerations to small-scale microfabric analysis of MTDs inferring paleo-stress conditions, transport direction, depositional mode and resulting porosity and permeability structure.…”

Section: Part Viii: Architecture Of Mass Transport Deposits/complexesmentioning

confidence: 99%

Submarine Mass Movements and Their Consequences

Yamada

Kawamura

Ikehara

et al. 2011

Submarine Mass Movements and Their Consequences

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MTD distribution on a ‘passive’ continental margin: The Espírito Santo Basin (SE Brazil) during the Palaeogene

Cited by 79 publications

References 47 publications

Bi-modal deformation styles in confined mass-transport deposits: Examples from a salt minibasin in SE Brazil

Bi-modal deformation styles in confined mass-transport deposits: Examples from a salt minibasin in SE Brazil

The Role of Mass Wasting In the Progressive Development Of Submarine Channels (Espírito Santo Basin, Se Brazil)

Submarine Mass Movements and Their Consequences

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