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dc.contributor.author
Escribano, Facundo A.
dc.contributor.author
Cornet, Julien
dc.contributor.author
Camilletti, Giuliano C.
dc.contributor.author
Otamendi, Juan E.
dc.contributor.author
Armas, Paula
dc.contributor.author
Cristofolini, Eber A.
dc.contributor.author
Bachmann, Olivier
dc.date.accessioned
2022-08-29T13:56:23Z
dc.date.available
2022-08-27T03:04:22Z
dc.date.available
2022-08-29T13:56:23Z
dc.date.issued
2022-11
dc.identifier.issn
0377-0273
dc.identifier.other
10.1016/j.jvolgeores.2022.107644
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/566914
dc.description.abstract
The Ordovician rocks of Sierra Las Planchadas are an exceptionally preserved natural example of a plutonic-volcanic connection. Located in northwestern Argentina, the Las Planchadas Formation consists of a monzogranitic batholith that displays a window into the source of large subvolcanic rhyolitic rocks, cryptodomes and volcanic feeder-dykes. Mafic intrusions and felsic dykes occur cutting the plutonic rocks. Grain-scale relationships, whole-rock compositions and mineral chemistry indicate that monzogranites and rhyolites are two comagmatic members which differentiated within upper crust magma reservoirs. Monzogranites accumulated some plagioclase and trapped a large volume of melt, denoted by a high modal percentage (~64–71%) of near-solidus minerals, comprised of alkali feldspar, albite-rich plagioclase (An<30), and late crystallized quartz. The formation of felsic dykes and rhyolitic cryptodomes is the result of a late melt extraction stage facilitated by the injection of hot mafic magmas from deeper in the system. The mafic-induced thermal reactivation increased the amount of melt-filled pore stored within a highly-crystallized monzogranite reservoir. The breakdown of the low-temperature phases overpressurized the mush and opened a network of microfractures into which residual melts, depleted in feldspar-compatible trace elements (Ba, Sr, and Eu), infiltrated. The draining system involved thin interconnected vein-like channels that merged into wider sheet-like conduits. Our results suggest that channelized segregation of late-stage melts in the subvolcanic environment is a mechanism for triggering rhyolitic eruptions.
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.subject
Famatinian arc
en_US
dc.subject
Monzogranite
en_US
dc.subject
Crystal-poor rhyolite
en_US
dc.subject
Upper-crustal mushes
en_US
dc.subject
Melt extraction
en_US
dc.subject
Volcanic feeding
en_US
dc.title
Generation of crystal-poor rhyolites from a shallow plutonic reservoir in the Famatinian arc (Argentina)
en_US
dc.type
Journal Article
dc.date.published
2022-08-11
ethz.journal.title
Journal of Volcanology and Geothermal Research
ethz.journal.volume
431
en_US
ethz.journal.abbreviated
J. volcanol. geotherm. res.
ethz.pages.start
107644
en_US
ethz.size
17 p.
en_US
ethz.grant
A subduction factory revealed: The Famatinian arc section, Argentina
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03958 - Bachmann, Olivier / Bachmann, Olivier
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03958 - Bachmann, Olivier / Bachmann, Olivier
ethz.grant.agreementno
173428
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Argentinian-Swiss Joint Research Programme (ASJRP)
ethz.date.deposited
2022-08-27T03:04:31Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2022-08-29T13:56:29Z
ethz.rosetta.lastUpdated
2023-02-07T05:49:25Z
ethz.rosetta.versionExported
true
ethz.COinS
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