New Insights into Late Synrift Subsidence from Detailed Well Ties and Seismic Mapping, Campos Basin, Brazil

Lewis, D. S.; Ensley, Ross; Leander, Mark

doi:10.5724/gcs.14.33.0098

Cited by 6 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The phase of transient emersion of the distal domain observed in our model can be linked with the karst affecting the Briançonnais unit, which attests to subaerial exposure. It can also explain the erosional unconformities reported in the outer hinge of the Campos Basin (Lewis et al, ) and at the second terrace of the East India margin (Haupert et al, ), both of which lie in the distal part of the margin, in a position comparable to that of the Briançonnais domain in the former European margin of the Alpine Tethys.…”

Section: Discussionmentioning

confidence: 91%

“…In the last decade, there has been growing evidence that distal parts of different magma‐poor rift systems underwent a transient uplift to shallow water depth, and in some cases even emersion during advanced stages of continental extension (see Table 1 in Esedo et al, ). Examples include the Briançonnais domain in the fossil Alpine Tethys rift system (e.g., Bourbon, ; Faure & Megard‐Galli, ), the outer hinge of the Campos Basin (Brazilian margin; Lewis et al, ), and, according to Haupert et al (), the second terrace of the East India margin. In these three examples, synrift deposits in the distal domain are truncated by erosional unconformities and covered by hemipelagic to pelagic sediments and/or sag to postrift stratigraphic units.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Emersion of Distal Domains in Advanced Stages of Continental Rifting Explained by Asynchronous Crust and Mantle Necking

Chenin

Manatschal

Decarlis

et al. 2019

Geochem Geophys Geosyst

View full text Add to dashboard Cite

We propose an explanation to the enigmatic synrift erosional unconformities reported along the distal domain of several magma‐poor rifted margins. Using thermomechanical numerical modeling, we show that transient emersion of (future) distal domains following a phase of subsidence can be explained by asynchronous necking of first the upper mantle and subsequently the crust, without the need of prominent normal faulting caused by strain softening, mantle phase transitions, or magmatic processes. When the upper crust and upper mantle are mechanically decoupled by a weak lower crust and, in the absence of any prominent rheological heterogeneity, upper mantle, necking starts first because of the higher deviatoric stresses associated with its larger effective viscosity. Consequently, the ductile lower crustal material flows toward the necked mantle domain, delaying thinning of the overlying crust. Once the necked lithospheric mantle has locally lost most of its strength, the overdeepened Moho moves upward toward an isostatically compensated depth. This flexural rebound causes uplift and emersion of distal parts of the rift system that are composed of still relatively thick crust and triggers the necking of the overlying crust. Early necking of the upper mantle causes a transient heating event with temperatures up to 750 °C at the base of the crust in the (future) distal domain. The onset of this thermal event slightly predates emersion of the (future) distal domain. These results are consistent with field observations and thermochronological data from the fossil Alpine Tethys margins, as well as with seismic observations from several present‐day rifted margins.

show abstract

Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Emersion of Distal Domains in Advanced Stages of Continental Rifting Explained by Asynchronous Crust and Mantle Necking

Chenin

Manatschal

Decarlis

et al. 2019

Geochem Geophys Geosyst

View full text Add to dashboard Cite

show abstract

“…For instance, the Briançonnais domain in the fossil distal European margin of the Alpine Tethys (e.g. Claudel & Dumont, 1999, Figure 1d), the Campos Basin offshore Brazil (Lewis et al, 2014), the South China Sea (e.g. Lin et al, 2003) and the East India margin (Haupert et al, 2016) show such a subsidence-uplift/emersion-subsidence evolution.…”

Section: Introductionmentioning

confidence: 99%

“…However, the width of the karst varies largely along strike and its estimate depends on the assumptions made on the direction of Alpine compression. The extent of the erosional unconformity is better constrained in the outer hinge of the Campos Basin, where it was mapped over a width of 10-30 km over 120 km along strike (Lewis et al, 2014). The subsidence-uplift/emersion-subsidence evolution recorded by these margins is schematically represented by the blue curve in Figure 1b.…”

Section: Introductionmentioning

confidence: 99%

“…Campbell (2005); Esedo et al (2012)), which could theoretically result in local erosion depending on the morphology of the margin. However, this process cannot account for the few tens of kilometers wide erosion of the future distal domain observed in the East India, South China Sea and Brazilian margins and in the former European margin of the Alpine Tethys because the adjacent proximal domains, which were made of thick continental crust and thus rested at shallow water depths, escaped erosion during the uplift of the future distal margin (Haupert et al, 2016;Lin et al, 2003;Lewis et al, 2014;Bourbon, 1980).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of crust–mantle mechanical coupling on the topographic and thermal evolutions during the necking phase of ‘magma-poor’ and ‘sediment-starved’ rift systems: A numerical modeling study

et al. 2020

View full text Add to dashboard Cite

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

show abstract

The Grès Singuliers of the Mont Blanc region (France and Switzerland): stratigraphic response to rifting and crustal necking in the Alpine Tethys

Ribes

Ghienne

Manatschal

et al. 2020

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

The Grès Singuliers unit represents an anomalous occurrence of a siliciclastic-dominated sedimentary system typifying a restricted geographic area around the Mont Blanc massif. Deposited during Early Jurassic rifting, this unit was influenced by the tectonic processes responsible for its development. This contribution integrates and reconciles sedimentological, stratigraphic and tectonic data and discusses the tectono-sedimentary evolution of the Mont Blanc basement and its autochthonous sedimentary cover. Based on depositional facies, a petrographic and detrital zircon provenance analysis, we propose that the Grès Singuliers unit is mainly derived from erosion of the local basement and pre-rift sedimentary cover. Furthermore, recognition of Jurassic cataclasites and black gouges capping the Mont Blanc basement confirms the hypothesis that the Mont Blanc domain formed an extensional core complex. The source to sink relationship between the Mont Blanc detachment system and the Grès Singuliers unit, as well as timing and location within the Alpine rift system, allows us to interpret this unit as the syn-tectonic sedimentary response to crustal necking, responsible for the onset of localized severe crustal/lithospheric thinning in the European margin of the Alpine Tethys rift system. The main result of this study was to show that the exhumation and uplift of basement during crustal/lithospheric necking produced a new source area for clastic sedimentary systems. Therefore, the local occurrence of a siliciclastic unit similar to the Grès Singuliers along passive margins may be symptomatic of necking zones in other rift systems.

show abstract

New Insights into Late Synrift Subsidence from Detailed Well Ties and Seismic Mapping, Campos Basin, Brazil

Cited by 6 publications

References 0 publications

Emersion of Distal Domains in Advanced Stages of Continental Rifting Explained by Asynchronous Crust and Mantle Necking

Emersion of Distal Domains in Advanced Stages of Continental Rifting Explained by Asynchronous Crust and Mantle Necking

Impact of crust–mantle mechanical coupling on the topographic and thermal evolutions during the necking phase of ‘magma-poor’ and ‘sediment-starved’ rift systems: A numerical modeling study

The Grès Singuliers of the Mont Blanc region (France and Switzerland): stratigraphic response to rifting and crustal necking in the Alpine Tethys

Contact Info

Product

Resources

About