Regional chemical diversity, crustal and mantle sources and evolution of central Andean Puna plateau ignimbrites

Kay, Suzanne Mahlburg; Coira, Beatríz; Caffe, Pablo Jorge; Chen, Chang-Hwa

doi:10.1016/j.jvolgeores.2010.08.013

Cited by 162 publications

(178 citation statements)

References 88 publications

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“…Volcanic activity in Oligocene-Miocene (22-18 Ma) produced pyroclastic sequences interstratified with continental sedimentary deposits (Caffe et al, 2002;del Papa et al, 2013), followed by the emplacement of sub-volcanic bodies (~12 Ma) (Coira et al, 1993;Caffe et al, 2002) and a period of intense volcanism (between 8.5 and 4 Ma; Kay et al, 2010). During the Neogene, giant calderas were produced and huge ignimbrite deposits (~11-15 × 10 3 km 3 ; Kay et al, 2010;Salisbury et al, 2011) formed the Altiplano Puna Volcanic Complex (APVC; de Silva, 1989;de Silva et al, 2006).…”

Section: Geological and Volcanological Settingsmentioning

confidence: 99%

“…During the Neogene, giant calderas were produced and huge ignimbrite deposits (~11-15 × 10 3 km 3 ; Kay et al, 2010;Salisbury et al, 2011) formed the Altiplano Puna Volcanic Complex (APVC; de Silva, 1989;de Silva et al, 2006). The recent sedimentary deposits consist of clastic and detrital material, alluvial fans and evaporitic deposits (Alonso, 1999).…”

Section: Geological and Volcanological Settingsmentioning

confidence: 99%

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Fluid geochemistry of a deep-seated geothermal resource in the Puna plateau (Jujuy Province, Argentina)

Arnold

Cabassi

Tassi

et al. 2017

Journal of Volcanology and Geothermal Research

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This study focused on the geochemical and isotopic features of thermal fluids discharged from five zones located in the high altitude Puna plateau (Jujuy Province between S 22°20′-23°20′ and W 66°-67°), i.e. Granada, Vilama, Pairique, Coranzulí and Olaroz. Partially mature waters with a Na + -Cl − composition were recognized in all the investigated zones, suggesting that a deep hydrothermal reservoir hosted within the Paleozoic crystalline basement represents the main hydrothermal fluid source. The hydrothermal reservoirs are mainly recharged by meteoric water, although based on the δ 18 O-H 2 O and δD-H 2 O values, some contribution of andesitic water cannot be completely ruled out. Regional S-oriented faulting systems, which generated a horst and graben tectonics, and NE-, NW-and WE-oriented transverse structures, likely act as preferentially uprising pathways for the deep-originated fluids, as also supported by the Rc/Ra values (up to 1.39) indicating the occurrence of significant amounts of mantle He (up to 16%). Carbon dioxide, the most abundant compound in the gas phase associated with the thermal waters, mostly originated from a crustal source, although the occurrence of CO 2 from a mantle source, contaminated by organic-rich material due to the subduction process, is also possible. Relatively small and cold Na + -HCO 3 − -type aquifers were produced by the interaction between meteoric water and Cretaceous, Palaeogene to Miocene sediments. Dissolution of evaporitic surficial deposits strongly affected the chemistry of the thermal springs in the peripheral zones of the study area. Geothermometry in the Na-K-Ca-Mg system suggested equilibrium temperatures up to 200°C for the deep aquifer, whereas lower temperatures (from 105 to 155°C) were inferred by applying the H 2 geothermometer, likely due to re-equilibrium processes during the thermal fluid uprising within relatively shallow Na-HCO 3 aquifers. The great depth of the geothermal resource (possibly N 5000 m b.g.l.) is likely preventing further studies aimed to evaluate possible exploitation, although the occurrence of Liand Ba-rich deposits associated may attract financial investments, giving a pulse for the development of this remote region.

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Section: Geological and Volcanological Settingsmentioning

confidence: 99%

Section: Geological and Volcanological Settingsmentioning

confidence: 99%

Fluid geochemistry of a deep-seated geothermal resource in the Puna plateau (Jujuy Province, Argentina)

Arnold

Cabassi

Tassi

et al. 2017

Journal of Volcanology and Geothermal Research

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“…Varios autores (Viramonte et al, 1984;Petrinovic et al, 2006) las consideran de capital importancia para el transporte y erupción de magmas en el retroarco andino. La característica principal de la porción más occidental de la Puna norte es la presencia de grandes complejos ignimbríticos, eruptados entre el Mioceno tardío al Plioceno, que en conjunto forman una de las provincias ignimbríticas silíceas de edad neógena más extensas del planeta (Coira et al, 1993;Kay et al, 2010). En el mismo lapso fueron eruptados algunos magmas máficos, aunque en volúmenes y dispersiones areales marcadamente inferiores a los de los dacíticos.…”

Section: Geología Y Volcanismo De La Puna Norteunclassified

“…1), a la inversa de lo que ocurre con los centros caldéricos silíceos de gran volumen (Coira et al, 1993). Este rasgo se correlacionaría con mayores espesores corticales en la porción norte de la Puna (~50-70 km versus ~42-45 km; Yuan et al, 2002;McGlashan et al, 2008), y con un proceso de delaminación más reciente y posiblemente más extendido en la Puna austral (Kay et al, 1994;Kay y Coira, 2009;Kay et al, 2010). Un elemento que pudo haber sido condicionante para el bajo número de volcanes máficos en Puna norte durante el Mioceno Superior a Plioceno es la presencia de sectores parcialmente fundidos o de almacenamiento de magmas en la corteza media/superior, interpretados a partir de una zona de baja velocidad sísmica en dicha región (Zandt et al, 2003).…”

Section: Geología Y Volcanismo De La Puna Norteunclassified

“…La variabilidad litológica y composicional de los depósitos piroclásticos y lavas eruptados resulta en la interpretación de una historia volcánica y geológica que puede servir de modelo para comprender el comportamiento eruptivo de los magmas máficos en la región puneña y otros ambientes geodinámicos semejantes. Asimismo, brinda elementos muy importantes para engrosar la escasa base de datos químico-petrográfica de rocas máficas que existe hasta el momento en Puna norte-Altiplano sur, un área dominada por voluminosas ignimbritas de composición dacítica y carácter híbrido, cuya génesis está estrechamente ligada a magmas de filiación mantélica (de Silva, 1989;Coira et al, 1993;Caffe et al, 2002;Kay et al, 2010).…”

Section: Introductionunclassified

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Historia eruptiva de los volcanes monogenéticos de El Toro (23º05’S-66º42’W), Puna norte, Argentina

Presta

Caffe

2014

Andgeo

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RESUMEN. Los volcanes monogenéticos de la región de El Toro (23º05'S-66º42'W) comprenden un conjunto de rocas volcánicas máficas de reducida extensión areal (<5 km2 ) generadas durante el Mioceno Superior-Plioceno en el ámbito de la Puna norte (Zona Volcánica Central andina). La actividad de al menos cuatro centros eruptivos principales resultó en la erupción de flujos de lavas desde sendos conos de escoria, cuyo modelo de facies se ajusta al de edificios formados por erupciones de estilo estromboliano. En algunos casos, los volcanes registraron breves fases de tipo transicional hawaiano que derivaron en fontanas localizadas y de pequeño tamaño, ocasionalmente con desarrollo oblicuo respecto al eje central del cono, responsables de la generación de depósitos piroclásticos aglutinados ('spatter') y lavas clastogénicas. Estos depósitos altamente soldados, aún calientes y dúctiles, habrían actuado como zonas de debilidad por donde los edificios colapsaron gravitacionalmente durante la efusión de lavas ('rafting'), evidenciando que en ocasiones las erupciones efusivas y piroclásticas fueron coetáneas. Las rocas volcánicas se clasifican geoquímicamente como basaltos, andesitas basálticas y andesitas calcoalcalinas de alto K. Las relaciones de elementos traza móviles e inmóviles (e.g., Ba/Nb) sugieren que las rocas de El Toro tienen firmas geoquímicas de arco, pero transicionales entre las de andesitas del arco frontal (León Muerto) y las de rocas máficas e intermedias andinas con tendencias de intraplaca (Las Burras). Esto confirma una posición de retroarco cercana al arco para la Puna norte occidental durante el Mioceno Superior-Plioceno. En algunos volcanes de El Toro afloran grupos de rocas con diferencias mineralógicas sustanciales, pero geoquímicamente indistinguibles, lo que sugiere diferencias en la temperatura y grado de cristalización de magmas que eran esencialmente semejantes. Por otro lado, magmas de composición diferente fueron eruptados casi simultáneamente desde el mismo centro volcánico, demostrando el carácter polimagmático complejo que tienen algunos volcanes monogenéticos.

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Delamination of southern Puna lithosphere revealed by body wave attenuation tomography

et al. 2014

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The southern Puna Plateau has been proposed to result from a major Pliocene delamination event that has previously been inferred from geochemical, geological, and some preliminary geophysical data. Seventy-five seismic stations were deployed across the southern Puna Plateau in 2007-2009 by scientists from the U.S., Germany, Chile, and Argentina to test the delamination model for the region. The Puna passive seismic stations were located between 25 and 28°S. Using the seismic waveform data collected from the PUNA experiment, we employ attenuation tomography methods to resolve both compressional and shear quality factors (Qp and Qs, respectively) in the crust and uppermost mantle. The images clearly show a high-Q Nazca slab subducting eastward beneath the Puna plateau and another high-Q block with a westward dip beneath the Eastern Cordillera. We suggest that the latter is a piece of delaminated South American lithosphere. A significant low-Q zone lies between the Nazca slab and the South American lithosphere and extends southward from the northern margin of the seismic array at 25°S before vanishing around 27.5°S. This low-Q zone extends farther west in the crust and uppermost mantle at the southern end of the seismic array. The low-Q zone reaches~100 km depth beneath the northern part of the array but only~50 km depth in the south. Lateral variations of the low-Q zone reflect the possible mechanism conversion between mantle upwelling related to delamination and dehydration. The depth of the Nazca slab as defined by Q images decreases from north to south beneath the plateau, which is consistent with the steep-flat transition of the angle of the subducting slab as defined by previous earthquake studies.

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Regional chemical diversity, crustal and mantle sources and evolution of central Andean Puna plateau ignimbrites

Cited by 162 publications

References 88 publications

Fluid geochemistry of a deep-seated geothermal resource in the Puna plateau (Jujuy Province, Argentina)

Fluid geochemistry of a deep-seated geothermal resource in the Puna plateau (Jujuy Province, Argentina)

Historia eruptiva de los volcanes monogenéticos de El Toro (23º05’S-66º42’W), Puna norte, Argentina

Delamination of southern Puna lithosphere revealed by body wave attenuation tomography

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