The structure of upper crustal magma plumbing systems controls the distribution volcanism and influences tectonic processes. However, delineating volume is difficult because (1) active intrusion networks cannot be directly accessed; (2) field outcrops are commonly limited; (3) geophysical data imaging subsurface restricted in areal extent resolution. This has led to models involving vertical transfer via dikes, extending from a melt source overlying reservoirs eruption sites, being favored...

Magmatic sheet intrusions contribute significantly to the upper crustal magma transport network. The emplacement mechanism of magmatic sheets controls final geometry and characteristics host rock deformation. Previous observations have highlighted preponderance brittle structures, associated with shallow-level intrusions. However, recent studies suggested that non-brittle behaviour also occurs, particularly related formation fingers during sill intrusion. Here, we examine both intrusion...

Abstract The movement of magma through the shallow crust and impact subsurface sill complexes on hydrocarbon systems prospective sedimentary basins has long been an area interest debate. Based 3D seismic reflection well data, we present a regional analysis emplacement magmatic plumbing system Palaeogene Faroe‐Shetland Sill Complex (FSSC), which is intruded into Mesozoic Cenozoic sequences Basin (FSB). Identification flow directions detailed interpretation approximately 100 sills indicates...

Over the last few decades, significant advances in using geophysical techniques to image structure of magma plumbing systems have enabled identification zones melt accumulation, crystal mush development, and migration. Combining advanced observations with petrological geochemical data has arguably revolutionised our understanding of, afforded exciting new insights into, development entire systems. However, divisions between scales physical settings over which these geophysical, petrological,...

The movement of magma in sedimentary basins often occurs through an extensive and interconnected complex sills. Field-, modelling-, seismic reflection-based studies indicate that the emplacement shallow-level sills is commonly accommodated by formation forced folds, which may be expressed at free surface onlapped younger strata. If age these onlapping strata can constrained, important insights gained into timing associated regional, tectono-magmatic events. Previous have focused on isolated...

Research Article| April 01, 2013 The influence of normal fault geometry on igneous sill emplacement and morphology Craig Magee; Magee 1Department Earth Science Engineering, Imperial College, London SW7 2BP, UK Search for other works by this author on: GSW Google Scholar Christopher A.-L. Jackson; Jackson Nick Schofield 2School Geography, Environmental Science, University Birmingham, Edgbaston, Birmingham B15 2TT, Author Article Information Publisher: Geological Society America Received: 05...

The architecture of subsurface magma plumbing systems influences a variety igneous processes, including the physiochemical evolution and extrusion sites. Seismic reflection data provides unique opportunity to image analyze these subvolcanic in three dimensions has arguably revolutionized our understanding emplacement. In particular, observation (1) interconnected sills, (2) transgressive sill limbs, (3) flow indicators seismic suggest that complexes can facilitate significant lateral (tens...

Ground deformation commonly precedes volcanic eruptions, although its relationship to underlying intrusion networks is complex. We use 3D seismic reflection data examine the link between a saucer-shaped sill and an overlying forced fold formed at contemporaneous palaeosurface. Our results highlight disparity in size fold, which we attribute accommodation of magma by overburden uplift fluid expulsion from host rock. Sill transgression occurred response plastic rock did not produce seismically...

The emplacement of igneous intrusions into sedimentary basins mechanically deforms the host rocks and causes hydrocarbon maturation. Existing models host-rock deformation are investigated using high-quality 3D seismic industry well data in western Møre Basin offshore mid-Norway. include synemplacement (e.g., elastic bending-related active uplift volume reduction metamorphic aureoles) postemplacement differential compaction) mechanisms. We use interpretations five horizons...

Shallow-level sill emplacement can uplift Earth's surface via forced folding, providing insight into the location and size of potential volcanic eruptions. Linking structure dynamics ground deformation to intrusion is thus critical in hazard assessment. This challenging, however, because (1) active intrusions cannot be directly observed, meaning that we rely on transient host-rock patterns model their structure; (2) where ancient sill-fold magmatism has long since ceased. To address this...

Abstract Reactivation of pre‐existing intra‐basement structures can influence the evolution rift basins, yet detailed kinematic relationship between these and overlying rift‐related faults remains poorly understood. Understanding as well geometric fault networks is important, with extension direction in many rifted provinces typically thought to lie normal strike. We here investigate this problem using a borehole‐constrained, 3D seismic reflection dataset from Taranaki Basin, offshore New...

Abstract Fluid migration pathways in the subsurface are heavily influenced by pre‐existing faults. Although studies of active fluid‐escape structures can provide insights into relationships between faults and fluid flow, they cannot fully constrain geometry controls on contemporaneous flow pathways. We use 3D seismic reflection data from offshore NW Australia to map 121 ancient hydrothermal vents, likely related magmatic activity, a normal fault array considered form The buried vents consist...

Research Article| December 08, 2017 Determining the three-dimensional geometry of a dike swarm and its impact on later rift using seismic reflection data Thomas B. Phillips; Phillips * 1Basins Group (BRG), Department Earth Science Engineering, Imperial College, Prince Consort Road, London SW7 2BP, UK *E-mail: tbphil13@gmail.com Search for other works by this author on: GSW Google Scholar Craig Magee; Magee Christopher A.-L. Jackson; Jackson Rebecca E. Bell Author Article Information...

Igneous sills emplaced at shallow levels in sedimentary basins commonly uplift the overburden and free surface. Uplift produces dome-shaped forced folds that may host economic hydrocarbon accumulations. These intrusion-induced are typically assumed to develop instantaneously, whereby oldest onlapping strata constrain age of sill emplacement, accommodate entire volume intruded magma. However, several studies demonstrate grow over geologic timescales, with additional space-making mechanisms...

Abstract. Dyke swarms are common on Earth and other planetary bodies, comprising arrays of dykes that can extend laterally for tens to thousands kilometres. The vast extent such dyke swarms, their presumed rapid emplacement, means they significantly influence a variety processes, including continental break-up, crustal extension, resource accumulation, volcanism. Determining the mechanisms driving swarm emplacement is thus critical range Science disciplines. However, unravelling mechanics...

Abstract Many sedimentary basins host thick evaporite (salt) deposits. Some of these also extensive igneous intrusion networks. It thus seems inevitable that, in some locations, magma will interact with salt. Yet how interaction between materials may influence salt tectonics or emplacement, particularly at the basin‐scale, remains poorly understood. We use 3D seismic reflection data from Santos Basin, offshore Brazil to image 38 intrusions spatially related Aptian Based on identified...

Abstract. The Svalbard Archipelago consists of three basement terranes that record a complex Neoproterozoic–Phanerozoic tectonic history, including four contractional events (Grenvillian, Caledonian, Ellesmerian, and Eurekan) two episodes collapse- to rift-related extension (Devonian–Carboniferous late Cenozoic). Previous studies suggest these likely accreted during the early mid-Paleozoic Caledonian Ellesmerian orogenies. Yet recent geochronological analyses show northwestern southwestern...

Sub-volcanic intrusive networks, of which cone sheets are recognised as a major constituent, partially control volcano growth and eruption style. The accepted sheet model is that these confocally dipping intrusions originate from an unexposed central magma chamber through dip-parallel flow. However, the emplacement mechanism remains poorly understood. ∼58 Ma swarm Ardnamurchan, NW Scotland, offers excellent opportunity to further resolve dynamics sheets, studying flow, their importance in...

The structural and stratigraphic evolution of rift basins passive margins has been widely studied, with many analyses demonstrating that delta systems can provide important records postrift geodynamic processes. However, the apparent lack ancient synbreakup paucity seismic imaging across continent-ocean boundaries mean transition from continental rifting to oceanic spreading remains poorly understood. Early Cretaceous Barrow Group North Carnarvon Basin, offshore NW Australia, was a major...

Abstract When continents rift, magmatism can produce large volumes of melt that migrate upwards from deep below the Earth’s surface. To understand how impacts rifting, it is critical to much generated and transits crust. Estimating pathways difficult, however, particularly in lower crust where resolution geophysical techniques limited. New broadband seismic reflection data allow us image three-dimensional (3-D) geometry magma crystallized (17.5–22 km depth) northern North Sea, an area...

Layer-bound, low-displacement normal faults, arranged into a broadly polygonal pattern, are common in many sedimentary basins. Despite having constrained their gross geometry, we have relatively poor understanding of the processes controlling nucleation and growth (i.e. kinematics) fault systems. In this study use high-resolution 3-D seismic reflection borehole data from northern North Sea to undertake detailed kinematic analysis faults forming part seismically well-imaged system hosted...

Abstract During continental breakup, the locus of strain shifts from a broad region border faulting and ductile plate stretching to narrow zone magma intrusion in young ocean basin. Recent studies volcanic rifts margins worldwide suggest this shift occurs subaerially, before onset seafloor spreading. We test hypothesis using recently acquired seismic reflection borehole data Danakil Depression, Ethiopia, unique transition between rifting Our data, located near Dallol, ~30 km northwest...