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Abstract:

Hudson volcano (Chile) is the southern most stratovolcano of the Andean Southern Volcanic Zone and has produced some of the largest Holocene eruptions in South America. There have been at least 12 recorded Holocene explosive events at Hudson, with the 6700 years BP, 3600 years BP, and 1991 eruptions the largest of these. Hudson volcano has consistently discharged magmas of similar trachyandesitic and trachydacitic composition, with comparable anhydrous phenocryst assemblages, and pre-eruptive temperatures and oxygen fugacities. Pre-eruptive storage conditions for the three largest Holocene events have been estimated using mineral geothermometry, melt inclusion volatile contents, and comparisons to analogous high pressure experiments. Throughout the Holocene, storage of the trachyandesitic magmas occurred at depths between 0.2 and 2.7 km at approximately ̃972°C (±25) and log fO2 -10.33-10.24 (±0.2) (one log unit above the NNO buffer), with between 1 and 3 wt% H2O in the melt. Pre-eruptive storage of the trachydacitic magma occurred between 1.1 and 2.0 km, at ̃942°C (±26) and log fO2 -10. 68 (±0.2), with ̃2.5 wt% H2O in the melt. The evolved trachyandesitic and trachydacitic magmas can be derived from a basaltic parent primarily via fractional crystallization. Entrapment pressures estimated from plagioclase-hosted melt inclusions suggest relatively shallow levels of crystallization. However, trace element data (e.g., Dy/Yb ratio trends) suggests amphibole played an important role in the differentiation of the Hudson magmas, and this fractionation is likely to have occurred at depths >6 km. The absence of a garnet signal in the Hudson trace element data, the potential staging point for differentiation of parental mafic magmas [i.e., ̃20 km (e.g., Annen et al. in J Petrol47(3):505-539, 2006)], and the inferred amphibolite facies [̃24 km (e.g., Rudnick and Fountain in Rev Geophys 33:267-309, 1995)] combine to place some constraint on the lower limit of depth of differentiation (i.e., ̃20-24 km). These constraints suggest that differentiation of mantle-derived magmas occurred at upper-mid to lower crustal levels and involved a hydrous mineral assemblage that included amphibole, and generated a basaltic to basaltic andesitic composition similar to the magma discharged during the first phase of the 1991 eruption. Continued fractionation at this depth resulted in the formation of the trachyandesitic and trachydacitic compositions. These more evolved magmas ascended and stalled in the shallow crust, as suggested by the pressures of entrapment obtained from the melt inclusions. The decrease in pressure that accompanied ascent, combined with the potential heating of the magma body through decompression-induced crystallization would cause the magma to cross out of the amphibole stability field. Further shallow crystallization involved an anhydrous mineral assemblage and may explain the lack of phenocrystic amphibole in the Hudson suite. © Springer-Verlag 2009.

Registro:

Documento: Artículo
Título:Role of cryptic amphibole crystallization in magma differentiation at Hudson volcano, Southern Volcanic Zone, Chile
Autor:Kratzmann, D.J.; Carey, S.; Scasso, R.A.; Naranjo, J.-A.
Filiación:Graduate School of Oceanography, URI, S. Ferry Rd., Narragansett, RI 02882, United States
Dpto. de Cs. Geológicas, FCEN, Univ. de Buenos Aires Cuidad Univ., Pab 2, 1 Piso, 1428 Buenos Aires, Argentina
Serv. Nacional Geol. y Minería, Casilla, Santiago 10465, Chile
Palabras clave:Amphibole crystallization; Andean margin; Hudson volcano; Magma differentiation; Southern Volcanic Zone; amphibole; chemical composition; crystallization; explosive volcanism; geothermometry; high pressure; Holocene; isotopic fractionation; melt inclusion; stratovolcano; trace element; volcanic eruption; Aisen; Chile; Mount Hudson; Southern Volcanic Zone
Año:2010
Volumen:159
Número:2
Página de inicio:237
Página de fin:264
DOI: http://dx.doi.org/10.1007/s00410-009-0426-1
Título revista:Contributions to Mineralogy and Petrology
Título revista abreviado:Contrib. Mineral. Petrol.
ISSN:00107999
CODEN:CMPEA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00107999_v159_n2_p237_Kratzmann

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Citas:

---------- APA ----------
Kratzmann, D.J., Carey, S., Scasso, R.A. & Naranjo, J.-A. (2010) . Role of cryptic amphibole crystallization in magma differentiation at Hudson volcano, Southern Volcanic Zone, Chile. Contributions to Mineralogy and Petrology, 159(2), 237-264.
http://dx.doi.org/10.1007/s00410-009-0426-1
---------- CHICAGO ----------
Kratzmann, D.J., Carey, S., Scasso, R.A., Naranjo, J.-A. "Role of cryptic amphibole crystallization in magma differentiation at Hudson volcano, Southern Volcanic Zone, Chile" . Contributions to Mineralogy and Petrology 159, no. 2 (2010) : 237-264.
http://dx.doi.org/10.1007/s00410-009-0426-1
---------- MLA ----------
Kratzmann, D.J., Carey, S., Scasso, R.A., Naranjo, J.-A. "Role of cryptic amphibole crystallization in magma differentiation at Hudson volcano, Southern Volcanic Zone, Chile" . Contributions to Mineralogy and Petrology, vol. 159, no. 2, 2010, pp. 237-264.
http://dx.doi.org/10.1007/s00410-009-0426-1
---------- VANCOUVER ----------
Kratzmann, D.J., Carey, S., Scasso, R.A., Naranjo, J.-A. Role of cryptic amphibole crystallization in magma differentiation at Hudson volcano, Southern Volcanic Zone, Chile. Contrib. Mineral. Petrol. 2010;159(2):237-264.
http://dx.doi.org/10.1007/s00410-009-0426-1