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dc.contributor.author
Rapela, Carlos Washington
dc.contributor.author
Pankhurst, Robert
dc.date.available
2021-03-02T12:32:02Z
dc.date.issued
2020-10
dc.identifier.citation
Rapela, Carlos Washington; Pankhurst, Robert; The continental crust of northeastern patagonia; Asociación Paleontológica Argentina; Ameghiniana; 57; 5; 10-2020; 480-498
dc.identifier.issn
0002-7014
dc.identifier.uri
http://hdl.handle.net/11336/127094
dc.description.abstract
The basement of northeastern Patagonia is characterized by Early Paleozoic igneous and metamorphic rocks that do not crop out in the central, western and Andean sectors of the North Patagonian Massif. A review of U-Pb geochronology, geochemistry, and the Nd, Sr, Hf and O isotope signature of the early Cambrian and early Ordovician magmatic rocks supports the hypothesis that the continental crust of northeastern Patagonia was essentially continuous with that of the Eastern Sierras Pampeanas in early Cambrian times. Mesoproterozoic lower crust is also inferred for this sector. New zircon Hf and O analyses of early Cambrian (Pampean) granites in the Sierras Pampeanas are indistinguishable from those of Cambrian granites in NE Patagonia, indicating an important crustal component in the source. The detrital zircon age patterns of the inferred basement are also similar in the two regions, strongly suggesting a southern Kalahari provenance. A modified hypothesis to explain the continuity of NE Patagonia with the Pampean belt of the Sierras Pampeanas during early Cambrian times, as well as their SW Gondwana geological affinity, is to consider this entire belt as an outboard sector of the mid-Cambrian rifting observed along the South America–South Africa–Weddell Sea margin. The detached sector would then have become juxtaposed against the Río de la Plata craton across the right-lateral Córdoba fault in late Cambrian times.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Asociación Paleontológica Argentina
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
CONTINENTAL CRUST
dc.subject
EARLY PALEOZOIC
dc.subject
GONDWANA
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HF-O ISOTOPES
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NORTHEASTERN PATAGONIA
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U-PB PROVENANCE
dc.subject.classification
Geoquímica y Geofísica
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
The continental crust of northeastern patagonia
dc.title
La corteza continental del noreste de la patagonia
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-02-10T20:44:55Z
dc.identifier.eissn
1851-8044
dc.journal.volume
57
dc.journal.number
5
dc.journal.pagination
480-498
dc.journal.pais
Argentina
dc.description.fil
Fil: Rapela, Carlos Washington. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.description.fil
Fil: Pankhurst, Robert. British Geological Survey; Reino Unido
dc.journal.title
Ameghiniana
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://bioone.org/journals/ameghiniana/volume-57/issue-5/AMGH.17.01.2020.3270/The-Continental-Crust-of-Northeastern-Patagonia/10.5710/AMGH.17.01.2020.3270.short
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.5710/AMGH.17.01.2020.3270
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