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dc.contributor.author
Chernicoff, Carlos Jorge
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dc.contributor.author
Zappettini, Eduardo Osvaldo
dc.contributor.author
Santos, João O. S.
dc.contributor.author
Mcnaughton, Neal J.
dc.contributor.author
Belousova, E.
dc.date.available
2016-01-27T19:51:30Z
dc.date.issued
2013-01
dc.identifier.citation
Chernicoff, Carlos Jorge; Zappettini, Eduardo Osvaldo; Santos, João O. S.; Mcnaughton, Neal J.; Belousova, E.; Combined U-Pb SHRIMP and Hf isotope study of the Late Paleozoic Yaminué Complex, Río Negro province, Argentina. Implications for the origin and evolution of the Patagonia composite terrane; Elsevier; Geoscience Frontiers; 4; 6; 1-2013; 37-56
dc.identifier.issn
1674-9871
dc.identifier.uri
http://hdl.handle.net/11336/3842
dc.description.abstract
We have carried out zircon U-Pb SHRIMP dating and Hf isotope determinations on a biotite paraschist and on a tonalitic orthogneiss of the Yaminué Complex, and re-evaluate this complex in the broader context of the tectonic evolution of the Patagonia composite terrane. In the metasedimentary unit (msuYC), the youngest detrital zircon dated at 318 ± 5 Ma (Mississippian/Pennsylvanian boundary) indicates a Pennsylvanian (or younger) depositional age. The three main age populations peak at 474, 454 and 374 Ma. Preliminary Hf isotope data for two detrital zircons (447 and 655 Ma) yielded ε(Hf) values of −0.32 and 0.48, indicating that their primary sources contained small amounts of recycled crustal components (of Calymmian age; TDM 1.56 Ga). Zircons from the orthogneiss (miuYC; intrusive into msuYC) show a crystallization age of 261.3 ± 2.7 Ma (Capitanian; late middle Permian) which is broadly coeval with deformation, and Neoarchean–Paleoproterozoic inheritance. Meaningful core-rim relationship between Neoarchean zircon cores and late Permian rims is well defined, indicating the occurrence of Archean crust in this sector of Patagonia. Hf TDM of Permian zircons is mainly Meso-Paleoarchean (2.97–3.35 Ga), with highly negative ε(Hf) values (ca. −33). Hf TDM of inherited Neoarchean zircon cores is also Meso-Paleoarchean (3.14–3.45 Ga) but more juvenile (ε(Hf) = −0.3). Hf isotopes reinforce the presence of unexposed ancient crust in this area.
Combining geological and isotope data, as well as geophysical models, we identify the Yaminué Complex within the La Esperanza-Yaminué crustal block flanked by two other, distinct crustal blocks: the Eastern block which forms part of the Patagonia terrane sensu stricto, located in the eastern Patagonian region, and the Western block forming part of the Southern Patagonia terrane. Their origins and timing of amalgamation to form the Patagonia composite terrane are also discussed.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
U-Pb Shrimp
dc.subject
Hf Isootopes
dc.subject
Yaminue Complex
dc.subject
Patagonia Composite Terrane
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
Combined U-Pb SHRIMP and Hf isotope study of the Late Paleozoic Yaminué Complex, Río Negro province, Argentina. Implications for the origin and evolution of the Patagonia composite terrane
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-03-30 10:35:44.97925-03
dc.journal.volume
4
dc.journal.number
6
dc.journal.pagination
37-56
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.conicet.avisoEditorial
Open Access funded by China University of Geosciences (Beijing) Under a Creative Commons license
dc.description.fil
Fil: Chernicoff, Carlos Jorge. Secretaría de Industria y Minería. Servicio Geologico Minero Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Zappettini, Eduardo Osvaldo. Secretaría de Industria y Minería. Servicio Geologico Minero Argentino; Argentina
dc.description.fil
Fil: Santos, João O. S.. University of Western Australia; Australia. Redstone Resources; Australia
dc.description.fil
Fil: Mcnaughton, Neal J.. Curtin University. John de Laeter Centre ; Australia
dc.description.fil
Fil: Belousova, E.. Macquarie University. ARC National Key Centre for Geochemical Evolution and Metallogeny of Continents; Australia
dc.journal.title
Geoscience Frontiers
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S1674987112000850
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.gsf.2012.06.003
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/issn/1674-9871
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