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dc.contributor.author
Lopez, Jose Pablo
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dc.contributor.author
Altenberger, Uwe
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dc.contributor.author
Bellos, Laura Iudith
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dc.contributor.author
Günter, Christina
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dc.date.available
2021-01-29T16:24:09Z
dc.date.issued
2019-08
dc.identifier.citation
Lopez, Jose Pablo; Altenberger, Uwe; Bellos, Laura Iudith; Günter, Christina; The Cumbres Calchaquíes Range (NW-Argentina): Geochemical sedimentary provenance, tectonic setting and metamorphic evolution of a Neoproterozoic sedimentary basin; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 93; 8-2019; 480-494
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/124228
dc.description.abstract
The Cumbres Calchaquíes Range forms part of the Famatinian metamorphic basement of the Eastern Sierras Pampeanas. The sedimentary protoliths of the metamorphic sequence were deposited in a marine basin alongside the western margin of Gondwana during the Neoproterozoic. New petrologic, geochemical and thermobarometric data give insight into the evolution of the sedimentary basin, its sediment source area, its later metamorphic overprint and its regional relationship to other parts of the Famatinian basement. The metamorphic series studied here consists of banded schists and gneisses and rare calcsilcate-rocks and migmatites that have been reworked by mid-to deep-crustal metamorphic and tectonic processes. The bulk rock compositions indicate shale, wacke, marl and litharenitic protoliths. The metamorphosed clastic sediments have major and trace element compositions indicating a continental granitoid-dominated source area with low sediment recycling. Low SiO2/Al2O3 ratios suggest a relatively low maturity of the sedimentary protoliths. Therefore, the Cumbres Calchaquíes section represents a sequence of turbidity currents with progressive shallowing of the depositional environment, as indicated by quartz- and carbonate-rich sediments. The overall data are consistent with the geodynamic environment of a basin adjacent to a continental magmatic arc as the most probable scenario. Whereas the sedimentary protoliths of the metamorphic basement in the Sierra de Ancasti and Sierra de Aconquija, located ca 100–300 km south of the study area are interpreted as originating in an evolving back-arc basin, our results from the Cumbres Calchaquíes region indicate a sedimentary source in a felsic continental arc with no significant influx of basic rocks. The Famatinian metamorphic evolution of the Cumbres Calchaquíes rocks is of typical Barrow-type, culminating in partial melting of the metasediments. Conventional thermobarometry combined with thermodynamic models (pseudosections) reveal a prograde evolution reaching peak conditions of ca 665 °C/6.1 Kbar. This implies a geothermal gradient of ca 35 °C/km, which is slightly higher than the average for continental crust and suggests a period of crustal thinning, as known from back-arc basins, or additional heat supply by voluminous intrusions.
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
CUMBRES CALCHAQUÍES
dc.subject
EASTERN SIERRAS PAMPEANAS
dc.subject
GEOCHEMISTRY
dc.subject
GEOTHERMOBAROMETRY
dc.subject
METAMORPHIC EVOLUTION
dc.subject
NW ARGENTINA
dc.subject
PROVENANCE STUDIES
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
The Cumbres Calchaquíes Range (NW-Argentina): Geochemical sedimentary provenance, tectonic setting and metamorphic evolution of a Neoproterozoic sedimentary basin
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-11-27T18:10:47Z
dc.journal.volume
93
dc.journal.pagination
480-494
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Massachusetts
dc.description.fil
Fil: Lopez, Jose Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Correlación Geológica. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Departamento de Geología. Cátedra Geología Estructural. Instituto Superior de Correlación Geológica; Argentina. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo; Argentina
dc.description.fil
Fil: Altenberger, Uwe. Universitat Potsdam; Alemania
dc.description.fil
Fil: Bellos, Laura Iudith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Correlación Geológica. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Departamento de Geología. Cátedra Geología Estructural. Instituto Superior de Correlación Geológica; Argentina
dc.description.fil
Fil: Günter, Christina. Universitat Potsdam; Alemania
dc.journal.title
Journal of South American Earth Sciences
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2019.03.016
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0895981118304474
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