Incremental growth of an upper crustal, A-type pluton, Argentina: Evidence of a re-used magma pathway

Alasino, Pablo H.; Larrovere, Mariano A.; Rocher, Sebastián; Dahlquist, Juán A.; Basei, Miguel Ângelo Stipp; Memeti, Vali; Paterson, Scott R.; Galindo, Carmen; Grande, Marcos Simón Macchioli; Neto, Mário da Costa Campos

doi:10.1016/j.lithos.2017.04.013

Cited by 38 publications

(21 citation statements)

References 62 publications

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“…We envisage that most of the causes described for the development of large-scale (10 2 -10 3 -m-wide) magma avalanches in peripheral mush zones occur in large, long-lived magma-mush chambers that mechanically mingle and mix, rather than small, isolated magma bodies (e.g., Solgadi and Sawyer, 2008;Pinotti et al, 2016). A long-lived, thermally mature magmatic plumbing system allows potentially multiple magma chambers to form at shallow crustal levels (e.g., Alasino et al, 2017). Thus, the generation of these multiple chambers by the ascent of different magma batches can be promoted by gravitational collapse and local convection of a ductile downward flow of the earlier magma mushes.…”

Section: Possible Causes Of Magma Avalanches In Chambersmentioning

confidence: 99%

Magmatically folded and faulted schlieren zones formed by magma avalanching in the Sonora Pass Intrusive Suite, Sierra Nevada, California

et al. 2019

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The southwestern margin of the Late Cretaceous Sonora Pass Intrusive Suite, northern Sierra Nevada, California (USA), preserves a densely populated zone of magmatic structures that record dynamic magmatic layer formation and deformation (faulting and folding) within a solidifying upper-crustal magma mush. This zone consists largely of coupled melanocratic (or schlieren) and leucocratic bands hosted within the 95.6 ± 1.5 Ma Kinney Lakes granodiorite (Leopold, 2016), with orientations approximately parallel to the intrusive margin and with inward younging directions. Schlieren consist of a high modal abundance of medium-grained ferromagnesian minerals (hornblende + biotite), zircon, sphene, apatite, opaque minerals, and minor plagioclase and interstitial quartz. Leucocratic bands are dominated by coarse-grained feldspar + quartz with minor ferromagnesian and accessory minerals. Whole-rock geochemical and Sr and Nd isotopic data indicate that the schlieren are derived from the Kinney Lakes granodiorite by effective mechanical separation of mafic minerals and accessory phases. We interpret that the schlieren zone at the margin of the Kinney Lakes granodiorite formed by large-scale collapse of crystal mush by “magma avalanching,” facilitated by gravity, local convection, and possibly by host-rock stoping at the margin. This process eroded a significant portion of the solidifying margin of the chamber and resulted in the formation of magmatically deformed layered structures, which experienced further mingling, re-intrusion, magmatic erosion, and recycling processes. We envisage that magma avalanching of magma mushes in plutons can be achieved by any unstable process (e.g., tectonic, fluid-assisted, stoping, or gravity-driven) in large, long-lived magma-mush chambers.

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Section: Possible Causes Of Magma Avalanches In Chambersmentioning

confidence: 99%

Magmatically folded and faulted schlieren zones formed by magma avalanching in the Sonora Pass Intrusive Suite, Sierra Nevada, California

et al. 2019

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“…The concept of thermal maturation has been described as the heat budget that is necessary to sustain long-lived magma reservoirs (e.g. Annen et al 2015;Alasino et al 2017;Karakas et al 2017). In particular, upper crustal reservoirs are fed from deeper levels, where magma is generated in extensive lower crustal mush zones (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Solano et al 2012;Karakas et al 2017). The heat supply that allows partial melting in these zones is provided by mantle upwelling or mafic underplating/intraplating of mafic magmas at the base of the crust (Solano et al 2012;Annen et al 2015;Alasino et al 2017;Dahlquist et al 2018). The generated melts then ascend and are emplaced in the upper crust, causing mass and heat transfer from deeper to shallow levels (Read, 1962;Petford et al 2000;Annen et al 2015;Cruden & Weinberg, 2018).…”

Section: Introductionmentioning

confidence: 99%

Thermal maturation of a complete magmatic plumbing system at the Sierra de Velasco, Northwestern Argentina

et al. 2020

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The formation of magmatic plumbing systems in the crust involves mass and heat transfer from deep to shallow levels. This process modifies the local geotherm and increases the thermal maturation of the crust, affecting the rheological state of the host rock and the composition of magma. Here, we report a petrological, geochemical, isotopic and geochronological integrated study of the Huaco (~354 Ma) and Sanagasta (~353 Ma, from a new U–Pb zircon age) units from the Carboniferous (Lower Mississippian) Huaco Intrusive Complex, NW Argentina. Similar values of ϵNd t and δ18O, of −3.2 ± 0.7 and +11.2‰ ± 0.3‰ (V-SMOW), respectively, for both units indicate that they shared the same source, as a result of mixing and later homogenization of a crustal component at the Late Devonian (~378 to 366 Ma), with metasomatized mantle-derived melts. Slightly higher contents of TiO2, FeO, MgO, CaO and rare earth elements for the Sanagasta unit in comparison with the Huaco unit suggest an increase in the degree of partial melting, which may have been caused by a higher temperature at the lower crust. In addition, the previous structural model of the Huaco Intrusive Complex points to an increase in thermal maturation in the upper crust, which drives a change in the emplacement style from tabular subhorizontal (Huaco) to vertically elongated (Sanagasta) bodies. Therefore, the evolution of the intrusive complex may reflect a generalized thermal maturation of the complete magmatic column, at both upper and lower crustal levels.

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“…Cada una de ellas pertenece a una UA, cubriendo prácticamente la totalidad del registro, dejando de lado exclusivamente y arbitrariamente once UA, debido a que se hallaban compuestas por escasos y pequeños tiestos, y pertenecían a estándares de pasta ya muestreados. En ese sentido, la selección se basó en la representatividad de UA de cada estilo tecnológico y formas del universo cerámico, Alasino et al 2017 siendo la mayor parte tiestos correspondientes a cuerpos y bordes de vasijas. Para el análisis se utilizó microscopio LEICA MPS 522, orientando la observación hacia: la identificación y cuantificación (300 puntos por lámina delgada) de las distintas especies minerales, fragmentos líticos, y otros antiplásticos; la determinación de proporción de matriz, cavidades e inclusiones no plásticas a partir de estimaciones de área mediante cartilla de cuantificación por comparación visual; la descripción de textura de fondo de pasta; el reconocimiento de la orientación de los constituyentes y cavidades; la caracterización del tamaño, redondez, esfericidad, selección y madurez textural y mineralógica de materiales clásticos; la detección de minerales secundarios; y la caracterización de cavidades (Cuomo di Caprio y Vaughan 1993; Curtois 1976; González de Bonaveri et al 2000;Livingstone Smith 2007;Middleton et al 1985;Raith et al 2012;Stoltman 1989).…”

Section: Materiales Y Metodologíaunclassified

Prácticas De Manufactura Alfarera De Las Comunidades Aldeanas De Inicios Del Primer Milenio (Siglos Iii-Vi Dc) en El Noroeste Argentino Estudios De Pastas Cerámicas De Uchuquita (Anillaco, La Rioja)

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Sabatini²,

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2019

Chungará (Arica)

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En este artículo se presentan los resultados obtenidos del estudio de cerámicas procedentes del conjunto arquitectónico Uchuquita, ubicado al norte de la Sierra de Velasco, Noroeste argentino (Anillaco, La Rioja, Argentina). Esta zona fue ocupada durante los inicios del primer milenio de la era (siglos III-VI DC) y constituye una de las primeras evidencias de las comunidades aldeanas que habitaron la región. A partir de un análisis submacroscópico y microscópico de pastas se reconocen aspectos composicionales y su relación con el perfil geológico del área, y las elecciones técnicas dentro del proceso de producción alfarera. La información obtenida permite proponer la existencia de una producción local/microrregional para la mayoría de los bienes alfareros consumidos en el área, así como diversidades y uniformidades tecnológicas en diferentes fases de la cadena operativa. Además, se plantea la existencia de una tradición alfarera basada en la cotidianeidad de la práctica, el ambiente, la circulación de bienes y personas, y el mantenimiento de vínculos socioculturales y tecnológicos regionales, en un contexto de producción doméstica, de baja escala. Los datos aportan al conocimiento de las trayectorias históricas de las comunidades locales y son una contribución empírica comparativa para esta región de los Andes. Palabras claves: alfarería, petrografía, primer milenio, comunidades aldeanas, Noroeste argentino.

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Incremental growth of an upper crustal, A-type pluton, Argentina: Evidence of a re-used magma pathway

Cited by 38 publications

References 62 publications

Magmatically folded and faulted schlieren zones formed by magma avalanching in the Sonora Pass Intrusive Suite, Sierra Nevada, California

Magmatically folded and faulted schlieren zones formed by magma avalanching in the Sonora Pass Intrusive Suite, Sierra Nevada, California

Thermal maturation of a complete magmatic plumbing system at the Sierra de Velasco, Northwestern Argentina

Prácticas De Manufactura Alfarera De Las Comunidades Aldeanas De Inicios Del Primer Milenio (Siglos Iii-Vi Dc) en El Noroeste Argentino Estudios De Pastas Cerámicas De Uchuquita (Anillaco, La Rioja)

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