Compositional variations and magma mixing in the 1991 eruptions of Hudson volcano, Chile

The August 1991 eruptions of Hudson volcano produced ∼2.7 km3 (dense rock equivalent, DRE) of basaltic to trachyandesitic pyroclastic deposits, making it one of the largest historical eruptions in South America. Phase 1 of the eruption (P1, April 8) involved both lava flows and a phreatomagmatic eru...

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Autor principal: Kratzmann, D.J
Otros Autores: Carey, S., Scasso, R., Naranjo, J.-A
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2009
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100 1 |a Kratzmann, D.J. 
245 1 0 |a Compositional variations and magma mixing in the 1991 eruptions of Hudson volcano, Chile 
260 |c 2009 
270 1 0 |m Kratzmann, D.J.; Graduate School of Oceanography, South Ferry Rd., Narragansett, RI 02882, United States; email: davidk@gso.uri.edu 
506 |2 openaire  |e Política editorial 
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520 3 |a The August 1991 eruptions of Hudson volcano produced ∼2.7 km3 (dense rock equivalent, DRE) of basaltic to trachyandesitic pyroclastic deposits, making it one of the largest historical eruptions in South America. Phase 1 of the eruption (P1, April 8) involved both lava flows and a phreatomagmatic eruption from a fissure located in the NW corner of the caldera. The paroxysmal phase (P2) began several days later (April 12) with a Plinian-style eruption from a different vent 4 km to the south-southeast. Tephra from the 1991 eruption ranges in composition from basalt (phase 1) to trachyandesite (phase 2), with a distinct gap between the two erupted phases from 54-60 wt% SiO2. A trend of decreasing SiO2 is evident from the earliest part of the phase 2 eruption (unit A, 63-65 wt% SiO2) to the end (unit D, 60-63 wt% SiO2). Melt inclusion data and textures suggest that mixing occurred in magmas from both eruptive phases. The basaltic and trachyandesitic magmas can be genetically related through both magma mixing and fractional crystallization processes. A combination of observed phase assemblages, inferred water content, crystallinity, and geothermometry estimates suggest pre-eruptive storage of the phase 2 trachyandesite at pressures between ∼50-100 megapascal (MPa) at 972 ± 6°C under water-saturated conditions (log fO2 -10.33 (±0.2)). It is proposed that rising P1 basaltic magma intersected the lower part of the P2 magma storage region between 2 and 3 km depth. Subsequent mixing between the two magmas preferentially hybridized the lower part of the chamber. Basaltic magma continued advancing towards the surface as a dyke to eventually be erupted in the northwestern part of the Hudson caldera. The presence of tachylite in the P1 products suggests that some of the magma was stalled close to the surface (<0.5 km) prior to eruption. Seismicity related to magma movement and the P1 eruption, combined with chamber overpressure associated with basalt injection, may have created a pathway to the surface for the trachyandesite magma and subsequent P2 eruption at a different vent 4 km to the south-southeast. © Springer-Verlag 2008.  |l eng 
536 |a Detalles de la financiación: National Science Foundation, EAR-0337023 
536 |a Detalles de la financiación: Acknowledgements The authors thank Alejandro Bande for assistance during fieldwork in 2005. Many thanks go to JD Devine, CW Mandeville, KA Kelley, NA Hamidzada & M Lytle for assistance and expertise during data collection. The manuscript was significantly improved by the detailed and thorough reviews of J McPhie, R Price & J Davidson. This research was supported by NSF grant EAR-0337023 to Carey and Scasso. 
593 |a GSO, Univ. of Rhode Island, S. Ferry Rd., Narragansett, RI 02882, United States 
593 |a Dpto. de Cs. Geologicas, FCEN, Univ. de Buenos Aires Cuidad Univ., Pab 2, 1 Piso, 1428 Buenos Aires, Argentina 
593 |a Serv. Nacional Geol. y Mineria, Casilla, Santiago 10465, Chile 
593 |a Graduate School of Oceanography, South Ferry Rd., Narragansett, RI 02882, United States 
690 1 0 |a ANDEAN VOLCANISM 
690 1 0 |a CALC-ALKALINE MAGMAS 
690 1 0 |a EXPLOSIVE ERUPTIONS 
690 1 0 |a HUDSON VOLCANO 
690 1 0 |a MAGMA MIXING 
690 1 0 |a BASALT 
690 1 0 |a CALDERA 
690 1 0 |a CHEMICAL COMPOSITION 
690 1 0 |a DIKE 
690 1 0 |a EXPLOSIVE VOLCANISM 
690 1 0 |a FISSURE 
690 1 0 |a FRACTIONAL CRYSTALLIZATION 
690 1 0 |a MAGMA 
690 1 0 |a MIXING 
690 1 0 |a PHREATOMAGMATISM 
690 1 0 |a PYROCLASTIC DEPOSIT 
690 1 0 |a SEISMICITY 
690 1 0 |a VOLCANIC ERUPTION 
690 1 0 |a VOLCANISM 
690 1 0 |a PLINIA 
651 4 |a CHILE 
651 4 |a SOUTH AMERICA 
700 1 |a Carey, S. 
700 1 |a Scasso, R. 
700 1 |a Naranjo, J.-A. 
773 0 |d 2009  |g v. 71  |h pp. 419-439  |k n. 4  |p Bull. Volcanol.  |x 02588900  |w (AR-BaUEN)CENRE-9833  |t Bulletin of Volcanology 
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