Structural control on magmatism along divergent and convergent plate boundaries: Overview, model, problems

Acocella, Valerio

doi:10.1016/j.earscirev.2014.05.006

Cited by 72 publications

(75 citation statements)

References 653 publications

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“…Magmatic intrusions usually cluster in magmatic segments parallel to the rift axis, producing rift-parallel eruptive fissures (Gudmundsson, 1995;Ebinger and Casey, 2001). Similar processes seem to occur also along magmatic arcs characterized by extension, as the Taupo Volcanic Zone of New Zealand, but are absent along contractional arcs, where large shallow magma chamber are lacking and the linear mode of magmatic accretion becomes generally more localized at the surface (Chaussard and Amelung, 2012;Acocella, 2014). Magmatic arcs undergoing strike-slip motions are less known, and only in their very general lines, as Sumatra, where volcanism focuses along major strike-slip systems (e.g.…”

Section: Introductionmentioning

confidence: 99%

Magmatic control along a strike-slip volcanic arc: The central Aeolian arc (Italy)

et al. 2016

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The regional stress field in volcanic areas may be overprinted by that produced by magmatic activity, promoting volcanism and faulting. In particular, in strike-slip settings, the definition of the relationships between the regional stress field and magmatic activity remains elusive.To better understand these relationships, we collected stratigraphic, volcanic and structural field data along the strike-slip Central Aeolian arc (Italy): here the islands of Lipari and Vulcano separate the extensional portion of the arc (to the east) from the contractional one (to the west). We collected >500 measurements of faults, extension fractures and dikes at 40 sites. Most structures are NNE-SSW to NNW-SSE oriented, eastward dipping, and show almost pure dip-slip motion; consistent with an E-W extension direction, with minor dextral and sinistral shear. Our data highlight six eruptive periods during the last 55 ka, which allow considering both islands as a single magmatic system, in which tectonic and magmatic activity steadily migrated eastward and currently focus on a 10 km long x 2 km wide active segment. Faulting appears to mostly occur in temporal and spatial relation with magmatic events, supporting that most of the observable deformation derives from transient magmatic activity (shorter-term, days to months), rather than from steady longer-term regional tectonics (10 2 -10 4 years). More in general, the Central Aeolian case shows how magmatic activity may affect the structure and evolution of volcanic arcs, overprinting any strike-slip motion with magma-induced extension at the surface. Keypoints: Relation between strike-slip kinematics and magmatism at volcanic arcs  Two neighbour volcanic islands share a single magmatic system  Magmatic stress is dominant and generates transient faulting

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Section: Introductionmentioning

confidence: 99%

Magmatic control along a strike-slip volcanic arc: The central Aeolian arc (Italy)

et al. 2016

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“…Magma-assisted processes similar to those observed in rifts may occur also along magmatic arcs experiencing extension, as the Taupo Volcanic Zone of New Zealand (Acocella et al, 2003;Rowland et al, 2010;Allan et al, 2012). Indeed, the tectono-magmatic architecture of "highly" extending arcs (∼1 cm/year or more) is similar to that of moderately extending continental rifts (Acocella, 2014). Contractional arcs are less common: along the contractional arc of NE Japan proper arc-parallel magmatic systems are lacking and the linear mode of magmatic accretion below the arc becomes generally punctiform at the surface (Acocella et al, 2008;Acocella, 2014).…”

Section: Introductionmentioning

confidence: 83%

“…Indeed, the tectono-magmatic architecture of "highly" extending arcs (∼1 cm/year or more) is similar to that of moderately extending continental rifts (Acocella, 2014). Contractional arcs are less common: along the contractional arc of NE Japan proper arc-parallel magmatic systems are lacking and the linear mode of magmatic accretion below the arc becomes generally punctiform at the surface (Acocella et al, 2008;Acocella, 2014). Many magmatic arcs are also characterized by significant strike-slip motion promoted by strain partitioning induced by the oblique convergence between the two interacting plates (e.g., McCaffrey, 1992;Lallemant, 1996;Acocella and Funiciello, 2010): examples include the Southern Andes, the Central American Volcanic Arc, the Mexican Trans Volcanic Belt, the Philippines, the Kurile arc and the Sumatra arc.…”

Section: Introductionmentioning

confidence: 95%

“…In fact, recent diking episodes in Afar (Asal-Ghoubbet, 1978;Dallol, 2004;Dabbahu, 2005), Iceland (Krafla, 1975(Krafla, -1984Bárðarbunga, 2014), Tanzania (Lake Natron, 2007) and Red Sea (Harrat Lunayyr, 2009;southern Red Sea, 2011 have shown the importance of transient magmatic events in the opening of rift zones (e.g., Ruegg et al, 1979;Rubin and Pollard, 1988;Tryggvason, 1994;Wright et al, 2006;Calais et al, 2008;Pallister et al, 2010;Nobile et al, 2012;Sigmundsson et al, 2015;Xu et al, 2015). These intrusions cluster in magmatic segments parallel to the rift axis, which are characterized by the focusing of tectonic and magmatic activity, with the development of rift-parallel eruptive fissures (Gudmundsson, 1995;Ebinger and Casey, 2001;Acocella, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Here the available information suggests that volcanism focuses along major strike-slip systems (Bellier and Sébrier, 1994;Bellier et al, 1999): however, detailed studies are lacking, so that the exact relationships between strike-slip structures and magmatism remain elusive, leaving a crucial knowledge gap (Acocella, 2014, and references therein). Indeed, despite the general spatial coincidence between the location of strike-slip faulting (along the dextral Great Sumatra Fault, or GSF) and volcanic activity, there are very limited data describing the local structural control on volcanism: knowledge gaps include the definition of the existence, configuration, shape and size of the magmatic systems, the definition of the relationships between the main tectonic structures and the rise, emplacement and eruption of magma.…”

Section: Introductionmentioning

confidence: 99%

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Weak Tectono-Magmatic Relationships along an Obliquely Convergent Plate Boundary: Sumatra, Indonesia

et al. 2018

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The tectono-magmatic relationships along obliquely convergent plate boundaries, where strain partitioning promotes strike-slip structures along the volcanic arc, are poorly known. Here it is unclear if and, in case, how the strike-slip structures control volcanic processes, distribution and size. To better define the possible tectono-magmatic relationships along strike-slip arcs, we merge available information on the case study of Sumatra (Indonesia) with field structural data. The Sumatra arc (entire volcanic belt) consists of 48 active volcanoes. Of these, 46% lie within 10 km from the dextral Great Sumatra Fault (GSF), which carries most horizontal displacement on the overriding plate, whereas 27% lie at >20 km from the GSF. Among the volcanoes at <10 km from GSF, 48% show a possible structural relation to the GSF, whereas only 28% show a clear structural relation, lying in pull-aparts or releasing bends; these localized areas of transtension (local extensional zone) do not develop magmatic segments. There is no relation between the GSF along-strike slip rate variations and the volcanic productivity. The preferred N30 • -N40 • E volcano alignment and elongation are subparallel to the convergence vector or to the GSF. The structural field data, collected in the central and southern GSF, show, in addition to the dextral motions along NW-SE to N-S striking faults, also normal motions (extending WNW-ESE or NE-SW), suggesting local reactivations of the GSF. Overall, the collected data suggest a limited tectonic control on arc volcanism. The tectonic control is mostly expressed by the mean depth of the slab surface below the volcanoes (130 ± 20 km) and, subordinately, local extension along the GSF. The latter, when WNW-ESE oriented (more common), may be associated with the overall tectonic convergence, as suggested by the structural data; conversely, when NE-SW oriented (less common), the extension may result from co-and post-seismic arc normal extension, as supported by the 2004 mega-earthquake measurements. Overall, the strike-slip arc of Sumatra has intermediate features between those of extensional and contractional arcs.

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Dike‐induced contraction along oceanic and continental divergent plate boundaries

Trippanera

Acocella

Ruch

2014

Geophysical Research Letters

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The axis of divergent plate boundaries shows extension fractures and normal faults at the surface. Here we present evidence of contraction along the axis of the oceanic ridge of Iceland and the continental Main Ethiopian Rift. Contraction is found at the base of the tilted hanging wall of dilational normal faults, balancing part of their extension. Our experiments suggest that these structures result from dike emplacement. Multiple dike injection induces subsidence above and uplift to the sides of the dikes; the transition in between is accommodated by reverse faults and subsequent peripheral inward dipping normal faults. Our results suggest that contraction is a direct product of magma emplacement along divergent plate boundaries, at various scales, marking a precise evolutionary stage and initiating part of the extensional structures (extension fractures and normal faults).

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Structural control on magmatism along divergent and convergent plate boundaries: Overview, model, problems

Cited by 72 publications

References 653 publications

Magmatic control along a strike-slip volcanic arc: The central Aeolian arc (Italy)

Magmatic control along a strike-slip volcanic arc: The central Aeolian arc (Italy)

Weak Tectono-Magmatic Relationships along an Obliquely Convergent Plate Boundary: Sumatra, Indonesia

Dike‐induced contraction along oceanic and continental divergent plate boundaries

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