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dc.contributor.author
Chernicoff, Carlos Jorge
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dc.contributor.author
Zappettini, Eduardo Osvaldo
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dc.contributor.author
Santos, Joao Orestes
dc.contributor.author
McNaughton, Neal
dc.date.available
2023-06-21T13:16:19Z
dc.date.issued
2022-12
dc.identifier.citation
Chernicoff, Carlos Jorge; Zappettini, Eduardo Osvaldo; Santos, Joao Orestes; McNaughton, Neal; Combined isotope study of the Ordovician Cerro de los Viejos Granite, La Pampa province, Argentina. Its derivation from the autochthonous, early Mesoproterozoic southwesternmost border of the Río de la Plata craton; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 120; 12-2022; 1-7
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/200921
dc.description.abstract
We have carried out the zircon U–Pb SHRIMP dating of the Cerro de los Viejos (CLV) Granite of southern La Pampa province, Argentina, which has yielded a concordia age of 468.0 ± 2.7 Ma, and determined the average Hf TDM model age of the dated zircon grains at 1491 Ma (Lower Mesoproterozoic; Calymmian), with an average epsilon Hf value of −3.13. Given the Ordovician (Darriwilian) crystallization age newly obtained for the CLV Granite, it becomes apparent that its previously known muscovite K–Ar Permian age of ca. 261 Ma would likely represent the age of the conspicuous shearing/mylonitization distinctive of this granitic body. Based on the new geochronologic and isotopic study of the CLV Granite, which also bears juvenile Rhyacian or “Transplatense” inheritance (aged at ca 2116 Ma, with average Hf TDM 2.4 Ga and average epsilon Hf value + 4.23) –an inheritance not known to occur in the neighbouring Patagonia or Pampia terranes–, as well as on comparisons with all the available geochronologic, isotopic, geophysical and geological data of the study region, in addition to broader tectonic considerations, we view the Ordovician CLV Granite as derived from the autochthonous, early Mesoproterozoic (Calymmian) southwesternmost portion of the Río de la Plata craton. The location of the CLV Granite would indicate that the peraluminous Ordovician magmatism of the southern La Pampa province, Argentina, straddles the Cambrian tectonic boundary between the Pampia terrane and the Río de la Plata craton. The CLV Granite would have been intruded in the immediate western continuation of the unexposed, E-W elongated upper crustal high/block recently identified by geophysical methods slightly to the east of the CLV Granite, the delineation of this block following the persistent sub-latitudinal structural fabric of the southern Río de la Plata craton, having also been reinforced by its probably late Middle Permian uplift coeval with the shearing of the CLV Granite.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ARGENTINA
dc.subject
CERRO DE LOS VIEJOS GRANITE
dc.subject
HF ISOTOPES
dc.subject
LA PAMPA PROVINCE
dc.subject
RÍO DE LA PLATA CRATON
dc.subject
U–PB SHRIMP
dc.subject.classification
Geociencias multidisciplinaria
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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 isotope study of the Ordovician Cerro de los Viejos Granite, La Pampa province, Argentina. Its derivation from the autochthonous, early Mesoproterozoic southwesternmost border of the Río de la Plata craton
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-06-21T10:51:46Z
dc.journal.volume
120
dc.journal.pagination
1-7
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Chernicoff, Carlos Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
dc.description.fil
Fil: Zappettini, Eduardo Osvaldo. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
dc.description.fil
Fil: Santos, Joao Orestes. University of Western Australia; Australia
dc.description.fil
Fil: McNaughton, Neal. Curtin University; Australia
dc.journal.title
Journal of South American Earth Sciences
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981122003741
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2022.104088
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