Retroarc volcanism in the northern San Rafael Block (34°–35°30′S), southern Central Andes: Occurrence, age, and tectonic setting

Folguera, Andrés; Naranjo, José A.; Orihashi, Yuji; Sumino, Hirochika; Nagao, Keisuke; Polanco, Edmundo; Ramos, Víctor A.

doi:10.1016/j.jvolgeores.2009.06.012

Cited by 84 publications

(67 citation statements)

References 23 publications

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“…Many workers have claimed that following this deformation, a Late Oligocene extensional regime affected the area between 35 • and 39 • south latitude (Charrier et al, 2005;Folguera et al, 2009;Godoy et al, 1999;Jordan et al, 2001;Muñoz et al, 2000;Radic et al, 2002;Radic, 2010). This episode is registered in 27-19 Ma old volcanic and volcaniclastic sequences which constitute poorly differentiated arc and back-arc rocks deposited in the Cura Mallín basin, a series of interconnected depocenters that were filled diachronically Muñoz, 1996;Radic et al, 2002;Radic, 2010;Suárez and Emparán, 1995;Uliana, 1978).…”

Section: Magmatic and Tectonic Evolutionmentioning

confidence: 99%

Neogene magmatic expansion and mountain building processes in the southern Central Andes, 36–37°S, Argentina

Spagnuolo

Litvak

Folguera

et al. 2012

Journal of Geodynamics

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Section: Magmatic and Tectonic Evolutionmentioning

confidence: 99%

Neogene magmatic expansion and mountain building processes in the southern Central Andes, 36–37°S, Argentina

Spagnuolo

Litvak

Folguera

et al. 2012

Journal of Geodynamics

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“…In this period, there was also a shift to an extensional regime in the back-arc (Kay et al, 2006a;Folguera et al, 2009;Bermúdez et al, 1993). The Payenia basaltic lavas have mainly an intraplate signature, with no depletion in the HFSE typical of arc magmas (Kay et al, 2004;Kay, 2002), and it has been modeled as a result of 2-8% of partial melting of an enriched mantle source (Kay, 2002).…”

Section: Introduction and Regional Settingmentioning

confidence: 97%

“…In the Quaternary Andean back-arc in western Argentina, between 35°S and 38°S, an intense volcanism was developed, mostly of alkaline basalts, in the Payenia Basaltic Province (Polanski, 1954), or simply 'Payenia', also named Andino-Cuyana Basaltic Province (Bermúdez and Delpino, 1989). Payenia is younger than 5 Ma, with an increase in the volcanic activity since 2 Ma, and it is the largest basaltic province of this age in the back-arc of South America, covering an area of 15,900 km 2 (Bermúdez et al, 1993;Folguera et al, 2009;Llambías et al, 2010). This province is divided into two basaltic fields: the Llancanelo Volcanic Field in the north, with an area of 10,700 km 2 , and the Payún Matrú Volcanic Field in the south, which covers an area of 5,200 km 2 (Bermúdez and Delpino, 1989;Bermúdez et al, 1993) (Fig.…”

Section: Introduction and Regional Settingmentioning

confidence: 99%

Volcanic stratigraphy and evidence of magma mixing in the Quaternary Payun Matru volcano, andean backarc in western Argentina

Hernando¹,

Llambías²,

González³

et al. 2012

Andgeo

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AbStRAct. The Payún Matrú Volcanic Field is located in the Payenia Basaltic Province of the recent back-arc of western Argentina (35°S-38°S). This province is younger than 5 Ma, and most of its volcanic activity took place since 2 Ma. The Payún Matrú Volcanic Field contains two composite volcanoes, Payún Matrú and Payún Liso, and two basaltic fields in an E-W oriented zone, located east and west of the Payún Matrú volcano. Payún Matrú is the largest volcano of this volcanic field, and consists of a shield-shaped edifice with a circular summit caldera of 8 km in diameter. The composition of both composite volcanoes is alkaline and predominantly trachytic, having also minor intermediate lavas.The basaltic fields consist of basalts and trachybasalts, with clinopyroxene and abundant olivine as phenocrysts and also in the groundmass. Textures indicating mixing and mingling processes, such as dusty plagioclases along with clear ones, biotite replaced by anhydrous minerals and two groundmasses with a fluid-fluid relationship, are common in the early pre-caldera stage of Payún Matrú and some post-caldera lavas. The latest post-caldera lavas are trachytic, with clean sanidine phenocrysts without disequilibrium textures. A remarkable characteristic of the Payún Matrú Volcanic Field is the fact that the Payún Matrú caldera is surrounded by basaltic fields at its base, while no basalts were erupted in the caldera region. We propose that the absence of basaltic lavas in the Payún Matrú volcano is due to the presence of a magmatic chamber below it, and that the mafic magmas rising from deeper levels were unable to erupt without interaction with more evolved melts. Intermediate hybrid magmas produced as a consequence of magma mixing and mingling between basaltic and trachytic magmas, are present in the early and mid-history of Payún Matrú volcano. We present here new information about the Quaternary Payún Matrú Volcanic Field derived from field work, petrography, and major element geochemistry and 87 Sr/ 86 Sr isotopic ratios. For the first time a detailed map of the Payún Matrú Volcanic Field and its volcanic stratigraphy, primarily based on field observations, are presented. RESuMEn. Estratigrafía volcánica y evidencia de mezcla de magmas en el volcán Payún Matrú del cuaternario, en el retroarco andino de Argentina occidental. El Campo Volcánico Payún Matrú está localizado en la Provincia Basáltica Payenia, en el retroarco reciente al oeste de Argentina (35°S-38°S). Esta provincia es más joven que 5 Ma, y la mayor parte de su actividad volcánica tuvo lugar desde hace 2 Ma. El Campo Volcánico Payún Matrú contiene dos volcanes compuestos, el Payún Matrú y el Payún Liso, así como dos campos basálticos en una franja E-W, ubicados al este y oeste del Payún Matrú. El Payún Matrú es el volcán más grande de este campo volcánico, y consiste en un edificio en forma de escudo con una caldera circular en su cúspide de 8 km de diámetro. La composición de ambos volcanes compuestos es alcalina y predominantemente traquítica, con menor...

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“…1) (Kay et al, 2006). Este volcanismo se encuentra representado en la zona por las formaciones Chapúa (Pleistoceno Inferior) y Tromen (Holoceno) (Kay et al, 2006;Folguera et al, 2009).…”

Section: Figunclassified

Mecanismos y fases de construcción orogénicos del frente oriental andino (36ºS, Argentina)

Cerimedo

Orts

Vera

et al. 2013

Andgeo

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RESUMEN.El frente oriental andino a los 36ºS posee características distintivas que van desde un desarrollo longitudinal oriental anómalo, definido por el levantamiento de una serie de estribaciones precordilleranas en el sur mendocino, hasta la ocurrencia de amplias secuencias volcánicas interpretadas como de intraplaca del Oligoceno Superior al Mioceno Inferior. El estudio del área del frente oriental cordillerano a los 36ºS a partir de extensivo mapeo superficial y datos sísmicos revela una compleja evolución que comprende una fase de exhumación previa a la efusión de los productos de intraplaca oligo-miocenos, una relajación extensional coetánea a los mismos y una última fase de levantamiento en el Mioceno. Esta última fase de exhumación se asocia localmente a sedimentación sinorogénica caracterizada por ciclos granocrecientes con proveniencia desde el área precordillerana en el este. Los mecanismos asociados al levantamiento de las estribaciones del sur mendocino resultan de una interacción entre estructuras de basamento, algunas de las cuales están asociadas a la inversión de fallas normales oligo-miocenas y de despegues en las secuencias pelíticas y yesosas del Cretácico superior y Mioceno. ABSTRACT. Mechanisms and deformational stages at the eastern Andean front (36ºS, Argentina). The easternAndean orogenic front at 36ºS shows unique attributes when compared to neighbor segments, from an anomalous eastward development of the orogenic front area due to the uplift of a zone of reduced topography in the foothills constituting a pre-Andean belt, to the occurrence of great Late Oligocene to Early Miocene within-plate series. The study of this eastern pre-Andean belt from extensive field mapping and analysis of seismic lines reveals a complex evolution that encompasses a pre-Late Oligocene stage of exhumation prior to the Late Oligocene-Miocene within-plate volcanic products which are coetaneous with an extensional relaxation phase, and one last period of contractional deformation that uplifted the pre-Andean sector in Miocene times. This last stage of orogenic construction is associated with synorogenic strata that show coarsening up sedimentary cycles with an eastward provenance. Contractional mechanisms involved deep ramps rooted into the basement, some of which are linked to inverted Late Oligocene-Miocene normal faults, to shallower detachments located in the Upper Cretaceous and Miocene incompetent layers.

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Retroarc volcanism in the northern San Rafael Block (34°–35°30′S), southern Central Andes: Occurrence, age, and tectonic setting

Cited by 84 publications

References 23 publications

Neogene magmatic expansion and mountain building processes in the southern Central Andes, 36–37°S, Argentina

Neogene magmatic expansion and mountain building processes in the southern Central Andes, 36–37°S, Argentina

Volcanic stratigraphy and evidence of magma mixing in the Quaternary Payun Matru volcano, andean backarc in western Argentina

Mecanismos y fases de construcción orogénicos del frente oriental andino (36ºS, Argentina)

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