Emplacement of multiple magma sheets and wall rock deformation: Trachyte Mesa intrusion, Henry Mountains, Utah

Morgan, Sven; Stanik, Amy; Horsman, Eric; Tikoff, Basil; Blanquat, Michel de Saint; Habert, Guillaume

doi:10.1016/j.jsg.2008.01.005

Cited by 125 publications

(128 citation statements)

References 40 publications

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“…For example, pore fluid expulsion within the thermal and/or structural aureole of the intrusion can lead to a significant volume reduction of the host rock ( Figure 1c) (Einsele et al, 1980;Morgan et al, 2008;Schofield et al, 2010Schofield et al, , 2012aSchofield et al, , 2014Jackson et al, 2013;Magee et al, 2013). This volume reduction resulting from a decreased porosity reduces the effect of active mechanical doming due to the emplacement of the intrusion.…”

Section: Synemplacement Processesmentioning

confidence: 99%

“…In addition, they are explored for hydrocarbons all over the world (e.g., Senger et al, forthcoming), onshore and offshore, e.g., the Rockall Basin (e.g., Magee et al, 2014), the Faroe-Shetland Basin (e.g., Smallwood and Maresh, 2002), the Møre and Vøring Basins (e.g., Planke et al, 2005;Cartwright and Hansen, 2006), and the Neuquén Basin (e.g., Kay et al, 2006). The magma plumbing systems in these basins are primarily dominated by interconnected networks of sill intrusions, the emplacement of which can significantly deform the host rock and influence petroleum system development (Kontorovich et al, 1997;Thomson and Hutton, 2004;Cartwright and Hansen, 2006;de Saint-Blanquat et al, 2006;Morgan et al, 2008;Galerne et al, 2011;Schofield et al, 2015;Magee et al, 2016;Wilson et al, 2016). For example, numerous studies have demonstrated that sill intrusions may (1) locally heat and mature organic matter within the host rock, generating oil and/or gas (e.g., Rodriguez Monreal et al, 2009), (2) be associated with 1 overlying dome structures that can be described as four-way dip closures Jackson et al, 2013;Magee et al, 2014Magee et al, , 2015, and (3) promote the development of local intense fracture networks that locally increase host rock permeability (Witte et al, 2012;Agirrezabala, 2015;Senger et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin

et al. 2017

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The emplacement of igneous intrusions into sedimentary basins mechanically deforms the host rocks and causes hydrocarbon maturation. Existing models of host-rock deformation are investigated using high-quality 3D seismic and industry well data in the western Møre Basin offshore mid-Norway. The models include synemplacement (e.g., elastic bending-related active uplift and volume reduction of metamorphic aureoles) and postemplacement (e.g., differential compaction) mechanisms. We use the seismic interpretations of five horizons in the Cretaceous-Paleogene sequence (Springar, Tang, and Tare Formations) to analyze the host rock deformation induced by the emplacement of the underlying saucer-shaped Tulipan sill. The results show that the sill, emplaced between 55.8 and 54.9 Ma, is responsible for the overlying dome structure observed in the seismic data. Isochron maps of the deformed sediments, as well as deformation of the younger postemplacement sediments, document a good match between the spatial distribution of the dome and the periphery of the sill. The thickness t of the Tulipan is less than 100 m, whereas the amplitude f of the overlying dome ranges between 30 and 70 m. Spectral decomposition maps highlight the distribution of fractures in the upper part of the dome. These fractures are observed in between hydrothermal vent complexes in the outer parts of the dome structure. The 3D seismic horizon interpretation and volume rendering visualization of the Tulipan sill reveal fingers and an overall saucer-shaped geometry. We conclude that a combination of different mechanisms of overburden deformation, including (1) elastic bending, (2) shear failure, and (3) differential compaction, is responsible for the synemplacement formation and the postemplacement modification of the observed dome structure in the Tulipan area.

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Section: Synemplacement Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin

et al. 2017

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“…6; Schofield et al, 2012a). Space-making mechanisms that do not involve roof uplift may also occur during intrusion into siliciclastic sequences (e.g., sandstone compaction, Morgan et al, 2008; shale fluidization, Schofield et al, 2010). The likely occurrence of multiple processes accommodating intrusion implies that overburden uplift, and therefore the degree of surface deformation, may not directly correlate to the volume or location of magma emplaced (Magee et al, 2013a).…”

Section: Ceduna Subbasin Offshore Southern Australiamentioning

confidence: 99%

Lateral Magma Flow in Mafic Sill‐complexes

Magee

Muirhead

Karvelas

et al. 2016

Acta Geologica Sinica (Eng)

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The structure of upper crustal magma plumbing systems controls the distribution of volcanism and influences tectonic processes. However, delineating the structure and volume of plumbing systems is difficult because (1) active intrusion networks cannot be directly accessed; (2) field outcrops are commonly limited; and (3) geophysical data imaging the subsurface are restricted in areal extent and resolution. This has led to models involving the vertical transfer of magma via dikes, extending from a melt source to overlying reservoirs and eruption sites, being favored in the volcanic literature. However, while there is a wealth of evidence to support the occurrence of dike-dominated systems, we synthesize field-and seismic reflection-based observations and highlight that extensive lateral magma transport (as much as 4100 km) may occur within mafic sill complexes. Most of these mafic sill complexes occur in sedimentary basins (e.g., the Karoo Basin, South Africa), although some intrude crystalline continental crust (e.g., the Yilgarn craton, Australia), and consist of interconnected sills and inclined sheets. Sill complex emplacement is largely controlled by host-rock lithology and structure and the state of stress. We argue that plumbing systems need not be dominated by dikes and that magma can be transported within widespread sill complexes, promoting the development of volcanoes that do not overlie the melt source. However, the extent to which active volcanic systems and rifted margins are underlain by sill complexes remains poorly constrained, despite important implications for elucidating magmatic processes, melt volumes, and melt sources.

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“…The laccolithic complex was progressively built by stacking and upward inflation of sills (e.g. Westerman et al 2004;Morgan et al 2008). The emplacement locations were probably controlled by structural heterogeneities in the TIB batholith (Cruden 2008) and/or by a stress field in which horizontal extensional fracturing could occur.…”

Section: Characteristics Of Alkali-feldspar and Plagioclasementioning

confidence: 99%

“…A growing number of recent studies indicate that the majority of ''inflated'' plutons are not actually balloon-shaped, but are instead rather tabular, and resemble laccoliths, in that they grow by amalgamation of individual magma pulses (e.g. Saint Blanquant et al 2001;Glazner et al 2004;Coleman et al 2004;Matzel et al 2006;Cruden 2008;Morgan et al 2008;Horsman et al 2009;Miller et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Multi-stage emplacement of the Götemar Pluton, SE Sweden: new evidence inferred from field observations and microfabric analysis, including cathodoluminescence microscopy

Friese

Vollbrecht

Tanner

et al. 2011

Int J Earth Sci (Geol Rundsch)

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The emplacement of the Mesoproterozoic Götemar Pluton into Paleoproterozoic granitoid host rocks of the Transscandinavian Igneous Belt is re-examined by microfabric analysis, including cathodoluminescence microscopy. Field data on the pluton-host rock system are used to strengthen the model. The Götemar Pluton, situated on the Baltic Shield of SE Sweden, is a horizontally zoned tabular structure that was constructed by the intrusion of successive pulses of magma with different crystal/melt ratios, at an estimated crustal depth of 4-8 km. Initial pluton formation involved magma ascent along a vertical dike, which was arrested at a mechanical discontinuity within the granitoid host rocks; this led to the formation of an initial sill. Subsequent sill stacking and their constant inflation resulted in deformation and reheating of existing magma bodies, which also raised the pluton roof. This multi-stage emplacement scenario is indicated by complex dike relationships and the occurrence of several generations of quartz (Si-metasomatism). The sills were charged by different domains of a heterogeneous magma chamber with varying crystal/melt ratios. Ascent or emplacement of magma with a high crystal/melt ratio is indicated by syn-magmatic deformation of phenocrysts. Complex crystallization fabrics (e.g. oscillatory growth zoning caused by high crystal defect density, overgrowth and replacement features, resorbed and corroded crystal cores, rapakivi structure) are mostly related to processes within the main chamber, that is repeated magma mixing or water influx.

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Emplacement of multiple magma sheets and wall rock deformation: Trachyte Mesa intrusion, Henry Mountains, Utah

Cited by 125 publications

References 40 publications

Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin

Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin

Lateral Magma Flow in Mafic Sill‐complexes

Multi-stage emplacement of the Götemar Pluton, SE Sweden: new evidence inferred from field observations and microfabric analysis, including cathodoluminescence microscopy

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