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dc.contributor.author
Acevedo, Rogelio Daniel
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dc.date.available
2023-12-20T13:17:27Z
dc.date.issued
2018
dc.identifier.citation
A megacryst- and xenolith-rich camptonite basalt from Ushuaia, Tierra del Fuego, Argentina; EGU General Assembly; Viena; Austria; 2018; 1-1
dc.identifier.issn
1029-7006
dc.identifier.uri
http://hdl.handle.net/11336/220890
dc.description.abstract
Isolated pods of volcanic breccias with alkalinecomposition are hosted in the metaturbidites of the Yahgan Formation to west ofUshuaia, Isla Grande de Tierra del Fuego, Argentina. The briefly exposed outcropsare almost partially covered by bushy vegetation, whence identification of its scarceapparitions is hampered. Field features display sinuous chilled margins withpinch and swell phenomena or show uneven shape with irregular branching andsegmentation into discrete blobs. Pods of breccias, possibly components of apipe-cluster, seem to represent incipient explosion of the melt that wouldgiven rise to a fully developed vent. Unique horned ends may occur, whichtotally preclude any tectonic explanation for the off-set, even in an Andeanfolded environment. Country rocks are not apparently altered by contact around theigneous boulders. The former may perhaps have acted as a long-lives feeder tolavas, so allowing the hostess to heat up graduatelly. The rock is constituted by macrocrysts of cognatedkaersutite (146 ±5 Ma) and K-feldspar (127 ±4 Ma), phenochrysts of olivine andTi-augite in a groundmass of the same minerals, with plagioclase andfeldspathoids. Texture is mostly aphyric and richly porphyritic both, withfine-grained black matrix. Carbonation is common as secondary alteration. Alkalimetasomatism is marked by developing of kaersutite, feldspathoids and zeolites. The presence of xenoliths, mainly of lherzolitic,pyroxenitic and wehrlitic composition, is the most prominent characteristic ofthese eruptive bodies (Acevedo, 2016). The geochemical plotting of Ce/Yb ratio vs Sm contentsshown these rocks not belong to a specified field in the lamprophyre branches. On the other hand, from a petrographic and petrologic outlook,the mineral arrangement places this rock as a broad volatile-enriched alkalibasalt or camptonite that reflects the mantle upwelling during the stage ofhorizontal extension of the back-arc basin in middle times of the Jurassic-Cretaceoustransition in Tierra del Fuego.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Copernicus Publications
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Camptonite
dc.subject
Ushuaia
dc.subject.classification
Geología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
A megacryst- and xenolith-rich camptonite basalt from Ushuaia, Tierra del Fuego, Argentina
dc.type
info:eu-repo/semantics/publishedVersion
dc.type
info:eu-repo/semantics/conferenceObject
dc.type
info:ar-repo/semantics/documento de conferencia
dc.date.updated
2023-09-15T12:07:12Z
dc.identifier.eissn
1607-7962
dc.journal.volume
20
dc.journal.pagination
1-1
dc.journal.pais
Alemania
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dc.journal.ciudad
Munich
dc.description.fil
Fil: Acevedo, Rogelio Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://egu2018.eu/home.html
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.geophysical-research-abstracts.net/egu2018.html
dc.conicet.rol
Autor
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dc.coverage
Internacional
dc.type.subtype
Congreso
dc.description.nombreEvento
EGU General Assembly
dc.date.evento
2018-04-08
dc.description.ciudadEvento
Viena
dc.description.paisEvento
Austria
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dc.type.publicacion
Journal
dc.description.institucionOrganizadora
European Geosciences Union
dc.source.revista
Geophysical Research Abstracts
dc.date.eventoHasta
2018-04-13
dc.relation.youtube
https://youtu.be/UmUUOpQosXM
dc.type
Congreso
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