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dc.contributor.author
Pimenta Silva, Manuel
dc.contributor.author
Marxer, Felix
dc.contributor.author
Keller, Tobias
dc.contributor.author
Giuliani, Andrea
dc.contributor.author
Ulmer, Peter
dc.contributor.author
Müntener, Othmar
dc.date.accessioned
2023-09-11T09:57:06Z
dc.date.available
2023-09-10T03:18:42Z
dc.date.available
2023-09-11T09:57:06Z
dc.date.issued
2023
dc.identifier.issn
0010-7999
dc.identifier.issn
1432-0967
dc.identifier.other
10.1007/s00410-023-02047-3
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/630769
dc.identifier.doi
10.3929/ethz-b-000630769
dc.description.abstract
Despite the first-order importance of crystallisation–differentiation for arc magma evolution, several other processes contribute to their compositional diversity. Among them is the remelting of partly crystallised magmas, also known as cumulate melting or ‘petrological cannibalism’. The impact of this process on the plutonic record is poorly constrained. We investigate a nepheline-normative dyke suite close to the Blumone gabbros, a large amphibole-gabbro unit of the Tertiary Southern Alpine Adamello igneous complex. The compositions of the studied dykes are characterised by low SiO2 (43–46 wt. %), MgO (5.0–7.2 wt. %), Ni (18–40 μg/g), and high Al2O3 (20.2–22.0 wt. %) contents. Phenocrystic plagioclase in these dykes exhibits major, trace, and Sr isotope compositions similar to Blumone cumulate plagioclase, suggesting a genetic link between the nepheline-normative dykes and the amphibole-gabbro cumulates. We tested this hypothesis by performing saturation experiments on a nepheline-normative dyke composition in an externally heated pressure vessel at 200 MPa between 975 and 1100 °C at fO2 conditions close to the Ni–NiO buffer. Plagioclase and spinel are near-liquidus phases at and above 1050 °C, contrasting with the typical near-liquidus olivine ± spinel assemblage in hydrous calc-alkaline basalts. The alkaline nature of the dykes results from the abundance of amphibole in the protolith, consistent with melting of amphibole-gabbro cumulates. We modelled the heat budget from the repeated injection of basaltic andesite into a partly crystallised amphibole-gabbro cumulate. The results of this model show that no more than 7% of the cumulate pile reaches temperatures high enough to produce nepheline-normative melts. We propose that such nepheline-normative dykes are a hallmark of hydrous cumulate melting in subvolcanic plumbing systems. Therefore, ne-normative dykes in arc batholiths may indicate periods with high magma fluxes.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Springer
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Arc magmatism
en_US
dc.subject
Chemical diversity
en_US
dc.subject
Cumulate melting
en_US
dc.subject
Thermal modelling
en_US
dc.subject
Experimental petrology
en_US
dc.subject
Nepheline-normative rocks
en_US
dc.subject
Petrological cannibalism
en_US
dc.subject
Arc batholiths
en_US
dc.subject
Magma plumbing systems
en_US
dc.subject
Amphibole
en_US
dc.title
Alkaline magmas in shallow arc plutonic roots: a field and experimental investigation of hydrous cumulate melting in the southern Adamello batholith
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2023-09-03
ethz.journal.title
Contributions to Mineralogy and Petrology
ethz.journal.volume
178
en_US
ethz.journal.issue
9
en_US
ethz.journal.abbreviated
Contrib. mineral. petrol.
ethz.pages.start
64
en_US
ethz.size
26 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Petrology and kinetics of igneous systems
en_US
ethz.grant
Polybaric fractional crystallization of arc magmas: An experimental study
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Berlin
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
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::03592 - Schmidt, Max / Schmidt, Max
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.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::03592 - Schmidt, Max / Schmidt, Max
ethz.grant.agreementno
184867
ethz.grant.agreementno
ETH-14 16-1
ethz.grant.fundername
SNF
ethz.grant.fundername
ETHZ
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.funderDoi
10.13039/501100003006
ethz.grant.program
Projekte MINT
ethz.grant.program
ETH Grants
ethz.date.deposited
2023-09-10T03:18:44Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2023-09-11T09:57:08Z
ethz.rosetta.lastUpdated
2024-02-03T03:25:54Z
ethz.rosetta.versionExported
true
ethz.COinS
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