Puna (Argentina) and northern Chile Ordovician basic magmatism: A contribution to the tectonic setting

Coira, Beatríz; Koukharsky, Magdalena María L.; Guevara, S. Rivero; Cisterna, Clara Eugenia

doi:10.1016/j.jsames.2008.10.002

Cited by 44 publications

(24 citation statements)

References 32 publications

(56 reference statements)

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“…Previously, during the Tremadocian, the volcanism in that region was related to the evolution of a marginal basin where depleted mantle derived melts (MORB) were produced and enriched through an extensional regime above the eastward dipping subducting slab (Cisterna et al, 2010b). Similar characteristics have been observed for the Tremadocian volcanism occurred along the western slope of the Puna (Coira et al, 2009). During the Arenigian the magmatism at the western of the Puna was related to a volcanic arc-back-arc basin system, which evolved on attenuated continental crust (Coira et al, 2009), environmental conditions similar to those proposed for the studied basalts at Las Planchadas range.…”

Section: The Famatina System In a Regional Geologic Frameworksupporting

confidence: 79%

“…Similar characteristics have been observed for the Tremadocian volcanism occurred along the western slope of the Puna (Coira et al, 2009). During the Arenigian the magmatism at the western of the Puna was related to a volcanic arc-back-arc basin system, which evolved on attenuated continental crust (Coira et al, 2009), environmental conditions similar to those proposed for the studied basalts at Las Planchadas range. Taking into account the ages, petrographic and chemical similarities between the Ordovician volcanic successions cropping out along the northern part of the Famatina System and the western magmatic Puna Belt (Fig.…”

Section: The Famatina System In a Regional Geologic Frameworksupporting

confidence: 79%

“…The study of Ordovician volcanic rock sequences along the Puna and the Famatina System (Northwestern Argentina) is the key to define their evolving tectonic setting at that time. In recent years these rocks sequences has been the subject of several studies (e.g., Koukharsky et al, 1996;Coira, 2008;Coira et al, 1999Coira et al, , 2002Coira et al, , 2009Viramonte et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Arenigian tholeiitic basalts in the Famatina Ordovician basin, northwestern Argentina: emplacement conditions and their tectonic significance.

Cisterna

Koukharsky²,

Coira

et al. 2017

andgeo

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ABSTRACT. This study is focused on the analysis of volcanic deposits that crop out at the middle portion of the Las Planchadas range, northern part of the Famatina System in Argentina. These volcanic rocks are records of an Ordovician effusive basaltic volcanism that took place under subaqueous marine conditions. Along the study area crop out an Arenigian volcanic and volcaniclastic rocks succession with massive and autoclastic lavas, hyaloclastites of basaltic composition and volcaniclastic sandstones and mudstones. Large volumes of the volcanic deposits were strongly affected by fragmentation processes during their subaqueous emplacement and in situ accumulated as basaltic breccias. The same volcanic-volcaniclastic association crops out to the south of the Las Planchadas range, forming a basaltic belt with similar characteristics. The geochemical features of the basalts are compatible with depleted mid-ocean ridge basalt (MORB)-like source for the magma, with contribution of subducted related components such as water rich marine hemipelagic sediments, compatible with a back arc geotectonic setting developed along the northern part of the Famatina System during the Arenigian.Keywords: Tholeiitic basalts, Syn-eruptive Hyaloclastic deposits, Ordovician, Famatina belt. RESUMEN. Basaltos toleíticos arenigianos en la cuenca ordovícica famatiniana, noroeste de Argentina: condiciones de emplazamiento y su implicancia tectónica. El presente trabajo se enfoca en el análisis de los depósitos volcánicos que af loran en el tramo medio de la sierra de Las Planchadas, norte del Sistema de Famatina, Argentina. Estas rocas representan un registro completo del volcanismo ordovícico, correspondiente a efusiones basálticas emplazadas en un ambiente submarino. En la zona estudiada af lora una sucesión volcánica-volcanoclástica representada por lavas macizas y autoclásticas de composición basáltica, hialoclastitas basálticas, psamitas y pelitas volcanoclástica. Extensos volúmenes de estos depósitos fueron afectados fuertemente por procesos de fragmentación durante su emplazamiento subácueo, acumulándose in situ como brechas basálticas. Asociaciones volcánicas-volcanoclástica con idénticas características también af loran hacia el sur, en la misma sierra de Las Planchadas, y forman un cinturón volcánico de basaltos. Las características geoquímicas de estas volcanitas son comparables con basaltos empobrecidos, originados en zonas de dorsales oceánicas (MORB) y con componentes propios de subducción, como la participación de sedimentos hemipelágicos ricos en agua. Estas características son indicativas de un ambiente tectónico de retroarco ligado a la evolución del tramo norte del Sistema de Famatina durante el Arenigiano. Ordovícico, Cinturón famatiniano. 124 Arenigian tholeiitic basalts in the Famatina Ordovician basin, northwestern Argentina... Palabras clave: Basaltos toleíticos, Depósitos hialoclásticos

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Section: The Famatina System In a Regional Geologic Frameworksupporting

confidence: 79%

Section: The Famatina System In a Regional Geologic Frameworksupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Arenigian tholeiitic basalts in the Famatina Ordovician basin, northwestern Argentina: emplacement conditions and their tectonic significance.

Cisterna

Koukharsky²,

Coira

et al. 2017

andgeo

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show abstract

“…Mafic and ultramafic rocks dispersed in the Puna were used to substantiate a suture in this area to mark the eastern border of the Antofalla Terrane. However, geochemical and isotope geochemical analyses in sedimentary and magmatic rocks could not reveal such a model Zimmermann et al 1999;Bock et al 2000;Lucassen et al 2000;Coira et al 2009). Sedimentological studies on both sides of the suggested ''suture'' could not reveal any significant difference in composition or facies or identify any juvenile detritus (Bahlburg 1990;Zimmermann 1999; this paper).…”

Section: Discussionmentioning

confidence: 99%

“…1b). Sedimentological, geochemical and isotope geochemical constraints do not support such a model as no oceanic material or magmatic rocks of typical mid-oceanic ridge origin have, so far, been found (Damm et al 1990;Breitkreuz 1986;Bahlburg and Hervé 1997;Bahlburg 1990Bahlburg , 1998Coira et al 2009). The westernmost exposure in the Cordón de Lila in Chile (Niemeyer 1989) comprises volcanic rocks of tholeiitic to rhyolitic composition (Niemeyer 1989) and sedimentary rocks of mostly unknown age and unknown tectonic setting, which allowed earlier to interpret the rocks as not being related to Gondwana and/or not of Ordovician age.…”

Section: Geologymentioning

confidence: 99%