Endogenous growth of a Miocene submarine dacite cryptodome, Rebun Island, Hokkaido, Japan

Goto, Yasuaki; McPhie, Jocelyn

doi:10.1016/s0377-0273(98)00040-7

Cited by 68 publications

(58 citation statements)

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“…However, relict cryptodomes display extensive concentric internal deformation, including brecciated carapace and strong flow-banding and partially brecciated rims (Snyder and Fraser, 1963;Goto and McPhie, 1998;Goto et al, 2000Goto et al, , 2004Stewart and McPhie, 2003). The Miocene rhyolitic Sandfell laccolith intruded the flank lava-succession of the Reydarfjörður central volcano at a depth of ∼500 m (Hawkes and Hawkes, 1933;Gibson, 1963;Gibson et al, 1966;Martin et al, 2011;de Jesus Padilla, 2015), and can therefore be considered a cryptodome.…”

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confidence: 99%

“…Structures within cryptodomes have been suggested to be generated by the dynamic interplay between intrusive and thermal stresses (Goto and McPhie, 1998;Goto et al, 2000Goto et al, , 2004Stewart and McPhie, 2003), but the processes leading to, and the effects of brittle deformation on cryptodome emplacement have not been studied in detail. On the other hand, brittle deformation in magma moving through volcanic conduits has been shown to be a manifestation of strain-induced ductile-brittle transition and to regulate the eruptive behavior of magma by influencing its potential to degas (Gonnermann and Manga, 2003;Tuffen et al, 2003;Lavallée et al, 2007;Cordonnier et al, 2012;Kendrick et al, 2013Kendrick et al, , 2016Ashwell et al, 2015;Pistone et al, 2016;Kushnir et al, 2017).…”

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Syn-Emplacement Fracturing in the Sandfell Laccolith, Eastern Iceland—Implications for Rhyolite Intrusion Growth and Volcanic Hazards

et al. 2018

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Felsic magma commonly pools within shallow mushroom-shaped magmatic intrusions, so-called laccoliths or cryptodomes, which can cause both explosive eruptions and collapse of the volcanic edifice. Deformation during laccolith emplacement is primarily considered to occur in the host rock. However, shallowly emplaced laccoliths (cryptodomes) show extensive internal deformation. While deformation of magma in volcanic conduits is an important process for regulating eruptive behavior, the effects of magma deformation on intrusion emplacement remain largely unexplored. In this study, we investigate the emplacement of the 0.57 km 3 rhyolitic Sandfell laccolith, Iceland, which formed at a depth of 500 m in a single intrusive event. By combining field measurements, 3D modeling, anisotropy of magnetic susceptibility (AMS), microstructural analysis, and FEM modeling we examine deformation in the magma to constrain its influence on intrusion emplacement. Concentric flow bands and S-C fabrics reveal contact-parallel magma flow during the initial stages of laccolith inflation. The magma flow fabric is overprinted by strain-localization bands (SLBs) and more than one third of the volume of the Sandfell laccolith displays concentric intensely fractured layers. A dominantly oblate magmatic fabric in the fractured areas and conjugate geometry of SLBs, and fractures in the fracture layers demonstrate that the magma was deformed by intrusive stresses. This implies that a large volume of magma became viscously stalled and was unable to flow during intrusion. Fine-grained groundmass and vesicle-poor rock adjacent to the fracture layers point to that the interaction between the SLBs and the flow bands at sub-solidus state caused the brittle-failure and triggered decompression degassing and crystallization, which led to rapid viscosity increase in the magma. The extent of syn-emplacement fracturing in the Sandfell laccolith further shows that strain-induced degassing limited the amount of eruptible magma by essentially solidifying the rim of the magma body. Our observations indicate that syn-emplacement changes in rheology, and the associated fracturing of intruding magma not only occur in volcanic conduits, but also play a major role in the emplacement of viscous magma intrusions in the upper kilometer of the crust.

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Syn-Emplacement Fracturing in the Sandfell Laccolith, Eastern Iceland—Implications for Rhyolite Intrusion Growth and Volcanic Hazards

et al. 2018

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“…Contacts of the intrusions are typically defined by intrusive hyaloclastite, indicating that they were emplaced into a host unit that was wet and poorly consolidated (e.g. Snyder and Fraser 1963;Hanson and Wilson 1993;Goto and McPhie 1998;Stewart and McPhie 2003). Lateral facies changes away from the proximal area mainly involve decreases in the volume of intrusions and in the thickness of pumice breccia.…”

Section: Volcano Types and Architecturementioning

confidence: 99%

Facies architecture and Late Pliocene – Pleistocene evolution of a felsic volcanic island, Milos, Greece

2006

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The volcanic island of Milos, Greece, comprises an Upper Pliocene -Pleistocene, thick (up to 700 m), compositionally and texturally diverse succession of calcalkaline, volcanic, and sedimentary rocks that record a transition from a relatively shallow but dominantly belowwave-base submarine setting to a subaerial one. The volcanic activity began at 2.66±0.07 Ma and has been more or less continuous since then. Subaerial emergence probably occurred at 1.44±0.08 Ma, in response to a combination of volcanic constructional processes and faultcontrolled volcano-tectonic uplift. The architecture of the dominantly felsic-intermediate volcanic succession reflects contrasts in eruption style, proximity to source, depositional environment and emplacement processes. The juxtaposition of submarine and subaerial facies indicates that for part of the volcanic history, below-wave base to abovewave base, and shoaling to subaerial depositional environments coexisted in most areas. The volcanic facies architecture comprises interfingering proximal (near vent), medial and distal facies associations related to five main volcano types: (1) submarine felsic cryptodome-pumice cone volcanoes; (2) submarine dacitic and andesitic lava domes; (3) submarine-to-subaerial scoria cones; (4) submarine-tosubaerial dacitic and andesitic lava domes and (5) subaerial lava-pumice cone volcanoes. The volcanic facies are

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“…The major characteristics of the studied peperites that are assumed to be key criteria (cf. Goto & McPhie 1998;Hunns & McPhie 1999;Gifkins et al 2002;Skilling et al 2002;Squire & McPhie 2002;Agnew et al 2004) for their interpretation with the sense that hot magma interacted with wet unconsolidated sediment are the following.…”

Section: Discussionmentioning

confidence: 99%

Magma–sediment interaction during the emplacement of syn-sedimentary silicic and mafic intrusions and lavas into and onto Triassic strata (Circum-Rhodope Belt, northern Greece)

Asvesta¹,

Dimitriadis²

2013

Geologica Carpathica

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Within the Circum-Rhodope Belt in northern Greece, Middle Triassic neritic carbonate metasediments are locally intercalated with quartz-feldspar-phyric metarhyolites. In the same belt, Upper Triassic pelagic lime-marl-layered metasediments are similarly intercalated with low-grade metamorphosed basalt, dolerite and minor andesite and trachydacite. We interpret these sequences as due to magmatism active during the rifting event that eventually led to the opening of the Vardar Ocean. Despite the overprint of Late Jurassic deformation and low greenschist metamorphism, peperitic textures produced by magma-wet sediment interaction are well preserved at the contacts between the silicic volcanic rocks and the originally wet unconsolidated neritic carbonate sediments, suggesting contemporaneous magmatism and sedimentation. The mafic and intermediate volcanic rocks lack peperitic textures at their contacts with the pelagic sedimentary rocks. Thin margin parallel banding in the sedimentary members of the sequence indicates thermally affected original contacts with the mafic volcanic rocks only locally and at a microscopic scale. The absence of peperite in this case is attributed to the consolidated state of the sediments at the time of the mafic magma emplacement.Key words: Triassic, Circum-Rhodope Belt, contact metamorphism, low greenschist metamorphism, carbonate sediments, basalt and dolerite, rhyolitic peperites. be inferred about their origin. Peperites were formed where a quartz-feldspar-phyric partly extrusive rhyolitic crypto-dome and rhyolitic sills intruded Triassic neritic carbonate sediments. Descriptions of the newly recognized peperite occurrences are provided. Specific criteria to discriminate peperite from other mixed volcanic-sediment breccia facies are discussed. Where mafic and intermediate rocks are in contact with Triassic pelagic sediments, peperite is absent; instead, small scale contact metamorphic phenomena are present. The cause of the absence of peperite in this case is discussed.

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Endogenous growth of a Miocene submarine dacite cryptodome, Rebun Island, Hokkaido, Japan

Cited by 68 publications

References 30 publications

Syn-Emplacement Fracturing in the Sandfell Laccolith, Eastern Iceland—Implications for Rhyolite Intrusion Growth and Volcanic Hazards

Syn-Emplacement Fracturing in the Sandfell Laccolith, Eastern Iceland—Implications for Rhyolite Intrusion Growth and Volcanic Hazards

Facies architecture and Late Pliocene – Pleistocene evolution of a felsic volcanic island, Milos, Greece

Magma–sediment interaction during the emplacement of syn-sedimentary silicic and mafic intrusions and lavas into and onto Triassic strata (Circum-Rhodope Belt, northern Greece)

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