Crustal xenoliths from Calbuco Volcano, Andean Southern Volcanic Zone: implications for crustal composition and magma-crust interaction

Hickey‐Vargas, Rosemary; Abdollahi, Mohammad Javad; Parada, Miguel A.; López-Escobar, Leopoldo; Frey, Frederick A.

doi:10.1007/bf00286933

Cited by 58 publications

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“…[1][2][3][4][5]. Most of the mafic xenoliths in volcanic rocks from island arc systems fall into one of three categories: cognate xenoliths that are indicative of magma mixing [e.g.…”

Section: Introductionmentioning

confidence: 99%

Two types of gabbroic xenoliths from rhyolite dominated Niijima volcano, northern part of Izu-Bonin arc: petrological and geochemical constraints

et al. 2017

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Abstract:We examined the petrography, petrology, and geochemistry of two types of gabbroic xenoliths (A-and Btype xenoliths) in olivine basalt and biotite rhyolite units among the dominantly rhyolitic rocks in Niijima volcano, northern Izu-Bonin volcanic arc, central Japan. A-type gabbroic xenoliths consisting of plagioclase, clinopyroxene, and orthopyroxene with an adcumulate texture were found in both olivine basalt and biotite rhyolite units, and B-type gabbroic xenoliths consisting of plagioclase and amphibole with an orthocumulate texture were found only in biotite rhyolite units. Geothermal-and barometricmodelling based on mineral chemistry indicated that the A-type gabbro formed at higher temperatures (899-955 ∘ C) and pressures (3.6-5.9 kbar) than the B-type gabbro (687-824 ∘ C and 0.8-3.6 kbar). These findings and whole-rock chemistry suggest different parental magmas for the two types of gabbro. The A-type gabbro was likely formed from basaltic magma, whereas the B-type gabbro was likely formed from an intermediate (andesitic) magma. The gabbroic xenoliths in erupted products at Niijima volcano indicate the presence of mafic to intermediate cumulate bodies of different origins at relatively shallower levels beneath the dominantly rhyolitic volcano.

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“…[1][2][3][4][5]. Most of the mafic xenoliths in volcanic rocks from island arc systems fall into one of three categories: cognate xenoliths that are indicative of magma mixing [e.g.…”

Section: Introductionmentioning

confidence: 99%

Two types of gabbroic xenoliths from rhyolite dominated Niijima volcano, northern part of Izu-Bonin arc: petrological and geochemical constraints

et al. 2017

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“…The main part of the ashes is rapidly eliminated from the atmosphere in a period of days or a few weeks; however, the gases and the smallest particles injected could remain for large periods of time. These aerosols reflect the solar radiation, thus cooling the atmosphere, and even can destruct the ozone layer (Sato et al 1993;Hickey-Vargas et al 1995;Gutierrez et al 2005;Selles et al 2004;Tilmes et al 2008). Antarctica is not the isolate pristine environment as it may seem; it is rather well connected to other continents, either by winds or oceanic currents, therefore it is exposed to natural and anthropogenic pollution sources.…”

Section: Introductionmentioning

confidence: 99%

Effect of the 2008 Chaitén volcano eruption over the antarctic snowfall

Cid-Agüero

Toro

Khondoker

et al. 2017

Anales Instituto Patagonia (Chile)

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“…South of 40.5 0 S, the volcanic front marked by Osorno and Calbuco is shifted westward, a potential indication of a steeper subduction angle within this section (Lopez -Escobar, et al, 1992;Lopez -Escobar et al, 1995). All of the stratovolcanoes in the CSVZ are predominantly basaltic, except for Calbuco which shows evidence for significant crustal contamination (Hickey -Vargas et al, 1995;Lopez -Escobar et al, 1995). Small…”

Section: 2cmentioning

confidence: 95%

“…It has been suggested that the small eruptive volumes of the SECs require the existence of fractures to get ascending magmas to the surface (Hickey - Lopez -Escobar et al, 1995).…”

Section: 2cmentioning

confidence: 99%

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Geochemical variation among small eruptive centers in the central SVZ of the Andes : an evaluation of subduction, mantle and crustal influences

Sun¹

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Sun, Murong, "Geochemical variation among small eruptive centers in the central SVZ of the Andes : an evaluation of subduction, mantle and crustal influences" (2001 We have read this dissertation and recommend that it be approyd. 209xxi Chapter 1 Introduction Geochemical processes in subduction zonesSubduction zones are regions where relatively colder, denser and mechanically stronger lithospheric plates sink into the hotter and weaker asthenospheric mantle. It is well accepted that the subducted slabs play a very important role in driving the motion of plates at trenches due to their negative buoyancy, generally described as the "slab-pull force" (Forsyth and Uyeda, 1975; Carlson, 1981; Carlson et al., 1983). Subduction zones usually comprise the trench, the forearc region including accretionary complexes, the volcanic arc where subduction-related volcanism takes place, and the back arc region (usually associated with extension, faulting, rifting and magmatism).Magmas generated at subduction zones are geochemically distinct from those produced at mid ocean ridges or oceanic islands by their significant enrichment of LILEs (large ion lithophile elements) relative to HFSEs (high field strength elements). There is a useful link between the chemistry of arc volcanics and the processes of subduction, which continuously recycle crustal materials back into the interior of the Earth.Many important advances have been made over the past decades in the understanding of subduction zone magmatism. These advances address how elements are transported from their mantle source into the continental crust, how they are recycled by sediment subduction and addition, and how they are incorporated into arc magmas through hydrous fluids or melts. At present, most of the previous work concludes that arc magmas are generated by a three -component (mantle wedge, subducted oceanic crust and sediments) model, i.e., melting of mantle peridotite metasomatized with fluids or 1 melts contributed from subducted oceanic slab and/or sediments. At continental arcs such as the Andes, some arc samples may also have been modified by crustal processes such as intra -crustal fractionation and assimilation (Tilton and Barreiro, 1980;James, 1984), MASH (melting, assimilation, storage and homogenization) (Hildreth and Moorbath, 1988) or crustal foundering (Arndt and Goldstein, 1989). However, debate continues because there remain many uncertainties regarding the fundamentals of arc magma genesis, such as: 1) What is the composition of the pre-subduction mantle source of arc magmas?The mantle wedge overlying the subducted slab is usually considered to be like the mantle source of MORB or OIB, and its compositional variability along or across arc strikes has been extensively investigated using trace element or isotope tracers (Varne, 1985; Hickey et al., 1986;Hickey -Vargas et al., 1989; Hochstaedter et al., 1990; Pearce and Parkinson, 1993). Previous studies pointed out that mantle source heterogeneity is observed in many arc locations, e.g., evide...

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Crustal xenoliths from Calbuco Volcano, Andean Southern Volcanic Zone: implications for crustal composition and magma-crust interaction

Cited by 58 publications

References 36 publications

Two types of gabbroic xenoliths from rhyolite dominated Niijima volcano, northern part of Izu-Bonin arc: petrological and geochemical constraints

Two types of gabbroic xenoliths from rhyolite dominated Niijima volcano, northern part of Izu-Bonin arc: petrological and geochemical constraints

Effect of the 2008 Chaitén volcano eruption over the antarctic snowfall

Geochemical variation among small eruptive centers in the central SVZ of the Andes : an evaluation of subduction, mantle and crustal influences

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