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dc.contributor.author
Payacán, Italo
dc.contributor.author
Gutierrez, Francisco
dc.contributor.author
Bachmann, Olivier
dc.contributor.author
Parada, Miguel Ángel
dc.date.accessioned
2023-03-23T12:39:32Z
dc.date.available
2023-03-20T08:08:53Z
dc.date.available
2023-03-21T14:25:17Z
dc.date.available
2023-03-21T14:58:50Z
dc.date.available
2023-03-23T12:39:32Z
dc.date.issued
2023-04-01
dc.identifier.issn
1553-040X
dc.identifier.other
10.1130/GES02535.1
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/603877
dc.identifier.doi
10.3929/ethz-b-000603877
dc.description.abstract
Crystal- melt separation has been invoked as a mechanism that generates compositional variabil-ities in magma reservoirs hosted within the Earth's crust. However, the way phase separation occurs within such reservoirs is still debated. The San Gabriel pluton of central Chile is a composite pluton (12.82 +/- 0.19 Ma) with wide textural/compositional variation (52- 67 wt% SiO2) and presents a great natural laboratory for studying processes that occur in upper crustal magma reservoirs. Geochemical and geochronological data supported by numerical models reveals that shallow magma differentiation via crystal- melt separation occurred in magma with intermediate composition and generated high-silica magmas and cumulate residues that were redistributed within the reservoir.The pluton is composed of three units: (1) quartz-monzonites representing the main hosting unit, (2) a porphyritic monzogranite located at the lowest exposed levels, and (3) coarse-grained quartz-monzodiorites with cumulate textures at the middle level of the intrusive. Calculations of mass balance and thermodynamic modeling of major and trace elements indicate that <40 vol% of haplogranitic residual melt was extracted from the parental magma to generate quartz-monzonites, and 50- 80 vol% was extracted to generate quartz-monzodiorites, which implies that both units represent crystal- rich residues. By contrast, the monzogranites are interpreted as a concentration of remobilized residual melts that followed 30-70 vol% fractionation from a mush with 0.4-0.55 of crystal fraction. The monzogranites represent the upper level of a pulse that stopped under a crystal- rich mush zone, probably leaving a mafic cumulate zone beneath the exposed pluton. This case study illustrates the role of the redistribution of residual silicic melts within shallow magma reservoirs.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Geological Society of America
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc/4.0/
dc.title
Differentiation of an upper crustal magma reservoir via crystal- melt separation recorded in the San Gabriel pluton, central Chile
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial 4.0 International
dc.date.published
2023-02-23
ethz.journal.title
Geosphere
ethz.journal.volume
19
en_US
ethz.journal.issue
2
en_US
ethz.pages.start
348
en_US
ethz.pages.end
369
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Taking apart a ‘super’ eruption: the Kneeling Nun Tuff, New Mexico
en_US
ethz.identifier.wos
ethz.publication.place
Boulder, CO
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
155923
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Projekte MINT
ethz.date.deposited
2023-03-20T08:09:00Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2023-03-23T12:39:33Z
ethz.rosetta.lastUpdated
2024-02-02T21:16:40Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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