Burial-Related Compaction Modifies Intrusion-Induced Forced Folds: Implications for Reconciling Roof Uplift Mechanisms Using Seismic Reflection Data

Magee, Craig; Hoggett, Murray; Jackson, Christopher; Jones, S. M.

doi:10.3389/feart.2019.00037

Cited by 25 publications

(42 citation statements)

References 57 publications

(136 reference statements)

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“…This may be possible, but evidence for sustained crustal inflation at such extreme rates has not been recognized. This is a frontier area that deserves further investigation [57,58].…”

Section: Role Of Extension and An Explanation For Really Obvious Counmentioning

confidence: 99%

Climate and the Development of Magma Chambers

Glazner

2020

Geosciences

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Whether magma accumulating in the crust develops into a persistent, eruptible magma body or an incrementally emplaced pluton depends on the energy balance between heat delivered to the bottom in the form of magma and heat lost out the top. The rate of heat loss to the surface depends critically on whether heat transfer is by conduction or convection. Convection is far more efficient at carrying heat than conduction, but requires both abundant water and sufficient permeability. Thus, all else being equal, both long-term aridity and self-sealing of fractures should promote development of persistent magma bodies and explosive silicic volcanism. This physical link between climate and magmatism may explain why many of the world’s great silicic ignimbrite provinces developed in arid environments, and why extension seems to suppress silicic caldera systems.

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“…This may be possible, but evidence for sustained crustal inflation at such extreme rates has not been recognized. This is a frontier area that deserves further investigation [57,58].…”

Section: Role Of Extension and An Explanation For Really Obvious Counmentioning

confidence: 99%

Climate and the Development of Magma Chambers

Glazner

2020

Geosciences

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“…By assuming the host rock behaves elastically during magma emplacement we can analytically or numerically model ground deformation patterns recorded in active volcanic areas; this may allow us to constrain possible intrusion geometries, locations, and dynamics [e.g., Biggs et al, 2009;Cannavò et al, 2015;Ebmeier et al, 2018;Pritchard and Simons, 2004;Sigmundsson et al, 2020;Sparks et al, 2012;van Wyk de Vries et al, 2014]. However, numerous studies have demonstrated that host rock deformation, in addition to elastic bending, may involve viscoelastic and/or inelastic (e.g., faulting or compaction) processes [e.g., de Saint-Blanquat et al, 2006;Guldstrand et al, 2017;Magee et al, 2013a;Magee et al, 2019a;Magee et al, 2017;Morgan et al, 2008;Poppe et al, 2019;Schmiedel et al, 2019;Schmiedel et al, 2017;Schofield et al, 2012;Sigmundsson et al, 2020;Wilson et al, 2016]. These viscoelastic and inelastic processes can partly accommodate emplacement and thereby suppress the size of forced folds generated by elastic bending [e.g., Magee et al, 2013a;Magee et al, 2019a].…”

Section: Introductionmentioning

confidence: 99%

“…However, numerous studies have demonstrated that host rock deformation, in addition to elastic bending, may involve viscoelastic and/or inelastic (e.g., faulting or compaction) processes [e.g., de Saint-Blanquat et al, 2006;Guldstrand et al, 2017;Magee et al, 2013a;Magee et al, 2019a;Magee et al, 2017;Morgan et al, 2008;Poppe et al, 2019;Schmiedel et al, 2019;Schmiedel et al, 2017;Schofield et al, 2012;Sigmundsson et al, 2020;Wilson et al, 2016]. These viscoelastic and inelastic processes can partly accommodate emplacement and thereby suppress the size of forced folds generated by elastic bending [e.g., Magee et al, 2013a;Magee et al, 2019a]. The possible contribution of viscoelastic and/or inelastic processes to accommodating magma emplacement means inversion of ground deformation patterns using elastic half-space models may thus underestimate key intrusion parameters (e.g., volume) [e.g., Galland, 2012b;Magee et al, 2018].…”

Section: Introductionmentioning

confidence: 99%

“…Although we recognise the need to better understand how magma emplacement translates into ground deformation [e.g., Ebmeier et al, 2018;Magee et al, 2018], most studies examine how intrusions create new structures (e.g., folds and faults) or modify host rock properties (e.g., porosity) [e.g., Hansen and Cartwright, 2006;Magee et al, 2019a;Montanari et al, 2017;Morgan et al, 2008;Reeves et al, 2018]. Here, we use 3D seismic reflection data from offshore NW Australia to investigate how pre-existing faults may affect the mechanics of roof uplift above an intruding sill.…”

Section: Introductionmentioning

confidence: 99%

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Fault inversion can accommodate ground deformation above inflating igneous sills

Norcliffe¹,

Magee²,

Jackson³

et al. 2020

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“…Thomaz-Filho et al (2008) highlight that intrusions may act as top and lateral seals in some Brazilian basins, or work as seal-bypass systems, when permeable, as suggested later by Senger et al (2013), based on data from Norway. "Forced folds" are structures commonly associated with shallow-level intrusions (Hansen and Cartwright, 2006;Galland et al, 2009;Jackson et al, 2013;Magee et al, 2014Magee et al, , 20162019;Omosanya et al, 2017). These structures are dome-shaped features developed above sills and laccoliths, generated by two intrusion-related mechanisms: (1) intrusion-induced uplift (e.g., Magee et al, 2014;Reeves et al, 2018), which is expressed in the free surface and may be onlapped by diachronous strata; and (2) post-emplacement differential compaction of host rocks, in which the fold grows slowly with progressive burial of sedimentary column above, producing divergent and overlying seismic reflection geometries (Hansen and Cartwright, 2006;Magee et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Unraveling Magmatic Activity in Sedimentary Basins: Sills and Related Brittle Structures Affecting Campos Basin Petroleum System (Se Brazil)

Avellar

Pereira

2019

J. Sed. Env.

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Historically, volcanic basins have been avoided by oil and gas companies for hydrocarbon exploration, due to high rates of unsuccessful cases, mainly when magmatic suites were unexpected. Furthermore, igneous rocks have always been considered harmful to petroleum systems. However, in the past two decades, researches regarding these systems in volcanic basins have shown a number of positive effects, as increasing permeability of tight rocks, and generation of traps. This work aims to investigate the occurrence and impacts of igneous intrusions on sedimentary basins regarding the reservoir and trap elements. For that, we use eight 2D seismic lines and five wells within the Papa-Terra field, southern Campos Basin, Brazil. Applying seismic stratigraphy, nineteen sills were identified, most of them have saucer-shaped geometries, but they are also planar. We have identified some possible joint connections in the NW sill complex, as well as a possible feeder dyke. Five sills are located right below two domal structures in the overburden, which were interpreted as forced-folds. There are fractures interpreted in the sills’ boundaries and in folded sediments. Some of the fractures in the sills boundaries were interpreted as hydrothermal vents that were active until Upper Cretaceous. The contribution of this study is a documentation of an offshore volcanic basin related to a proven petroleum system in the south Atlantic, which has been neglected by Brazilian researchers over the years. ATIVIDADE MAGMÁTICA EM BACIAS SEDIMENTARES: SOLEIRAS E FALHAS ASSOCIADAS QUE AFETAM O SISTEMA PETROLÍFERO DA BACIA DE CAMPOS (SE BRASIL) ResumoHistoricamente, as empresas de petróleo e gás evitam efectuar propecção de hidrocarbonetos em bacias afetadas por vulcanismo, devido a elevadas taxas de insucesso, principalmente quando os pacotes magmáticos são inesperados. Além disso, as intrusões de rochas ígneas sempre foram consideradas prejudiciais aos sistemas petrolíferos. No entanto, nas últimas duas décadas, pesquisas relacionadas a esses sistemas em bacias vulcânicas mostraram vários efeitos positivos, pois podem contribuir para o aumento da permeabilidade de rochas compactas e geração de armadilhas. Este trabalho tem como objetivo investigar a ocorrência e os impactos de intrusões ígneas numa bacia sedimentar. Para isso, foram analisadas oito linhas sísmicas 2D e cinco poços no campo Papa-Terra, no sul da Bacia de Campos, Brasil. Aplicando a estratigrafia sísmica, foram identificadas dezanove soleiras, a maioria delas com geometrias em forma de pires, mas também planas. Foram identificadas algumas possíveis conexões no complexo da soleira NW, bem como um possível dique de alimentação. Cinco soleiras localizadas logo abaixo de duas estruturas em forma de doma correspondem possivelmente a dobras forçadas. Existem fraturas nos limites das soleiras e em sedimentos dobrados. Algumas das fraturas nos limites das soleiras poderão ter funcionado como ductos circulação hidrotermal que terão estado ativos até o Cretáceo Superior. Este estudo contribuiu para um melhor conhecimento de uma bacia vulcânica offshore relacionada a um sistema petrolífero comprovado no Atlântico Sul, a qual tem sido negligenciada por pesquisadores brasileiros ao longo dos anos. Palavras-chave: Vulcânica. Bacia Sedimentar. Soleira em forma de pires. Estratigrafia sísmica. Bacia Offshore. Margem Continental. Cretáceo Superior.

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Burial-Related Compaction Modifies Intrusion-Induced Forced Folds: Implications for Reconciling Roof Uplift Mechanisms Using Seismic Reflection Data

Cited by 25 publications

References 57 publications

Climate and the Development of Magma Chambers

Climate and the Development of Magma Chambers

Fault inversion can accommodate ground deformation above inflating igneous sills

Unraveling Magmatic Activity in Sedimentary Basins: Sills and Related Brittle Structures Affecting Campos Basin Petroleum System (Se Brazil)

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