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dc.contributor.author
Coira, Beatriz Lidia Luisa
dc.contributor.author
Kirschbaum, Alicia Matilde
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Hongn, Fernando Daniel
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Pérez, Belén
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Menegatti, Nilda Dina
dc.date.available
2018-08-01T21:12:35Z
dc.date.issued
2009-12
dc.identifier.citation
Coira, Beatriz Lidia Luisa; Kirschbaum, Alicia Matilde; Hongn, Fernando Daniel; Pérez, Belén; Menegatti, Nilda Dina; Basic magmatism in northeastern Puna, Argentina: Chemical composition and tectonic setting in the Ordovician back-arc; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 28; 4; 12-2009; 374-382
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/53851
dc.description.abstract
Two main groups of basic rocks, representative of the bimodal Ordovician magmatism of the northeastern Puna (22-24°S, 66°30'-65°40'W) were revisited on the basis of new geological, petrographic and geochemical data. One of them shows geochemical characteristics intermediate between those of MORB and arc-type basalts common in back-arc basins. The other group is represented by low and high Ti basalts and gabbros with an OIB-type signature. Basalts of the first group (Tremadocian-early Arenigian) along with minor dacites are found within a sedimentary-volcanic sequence that hosts the Cobres and the Tanque granitic plutons (475-480 Ma). This group of basic rocks is also coeval with Cobres Granite, whereas magmas with OIB-type signature were contemporary with the emplacement of Tanque Granite. During the early to middle Arenigian, dacites and minor amounts of basalts with OIB-type signatures erupted in the Escaya-Huancar ranges and were intruded as dikes in Cobres and Tanque ranges. Two main stages are recorded in the tectono-magmatic evolution of the region. The first stage was dominated by extension (Tremadocian-early Arenigian), and the second (until the late Arenigian) during which extensional and contractional conditions occurred diachronously along the basin. The geochemical characteristics of the basic magmas are attributed to a combination of factors such as variably depleted mantle sources, continental crustal contamination and addition of subduction components, as well as variations in the degree of melting in the sources. These factors probably were controlled by episodical changes both in time and space in the extensional conditions. These characteristics altogether indicate a back-arc setting for the northeastern Puna during Early and Middle Ordovician, in which contractional episodes took place.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
ARGENTINA
dc.subject
BACK-ARC MAGMATISM
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EXTENSIONAL-CONTRACTIONAL EPISODES
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NORTHEASTERN PUNA
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ORDOVICIAN
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Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Basic magmatism in northeastern Puna, Argentina: Chemical composition and tectonic setting in the Ordovician back-arc
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-07-23T17:17:00Z
dc.journal.volume
28
dc.journal.number
4
dc.journal.pagination
374-382
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Coira, Beatriz Lidia Luisa. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Jujuy; Argentina
dc.description.fil
Fil: Kirschbaum, Alicia Matilde. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; Argentina
dc.description.fil
Fil: Hongn, Fernando Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; Argentina
dc.description.fil
Fil: Pérez, Belén. Universidad Nacional de Jujuy; Argentina
dc.description.fil
Fil: Menegatti, Nilda Dina. Universidad Nacional de Salta; Argentina
dc.journal.title
Journal of South American Earth Sciences
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1016/j.jsames.2009.04.007
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981109000650
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