Quaternary volcanic activity of Hudson and Lautaro volcanoes, Chilean Patagonia: New constraints from K-Ar ages

Orihashi, Yuji; Naranjo, José A.; Motoki, Akihisa; Sumino, Hirochika; Hirata, Daiji; Anma, Ryo; Nagao, Keisuke

doi:10.4067/s0716-02082004000200002

Cited by 44 publications

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“…Field observations, petrologic and geochemical data from the volcano are herein reported. This work complements that of Orihashi et al (2004 …”

supporting

confidence: 70%

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Geologic reconnaissance of Lautaro Volcano, Chilean Patagonia

Motoki¹,

Orihashi²,

Naranjo³

et al. 2010

andgeo

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Lautaro is the volcano closest to the Chile Triple Junction in the Andean Austral Volcanic Zone. The volcanic edifice of 3,607 m a.s.l. stands out on the north-western part of the plateau of the South Patagonian Ice Field. The volcano basement is composed of low-grade meta-pelites that are cut by tabular intrusive bodies of hornblende-biotite granite. The volcano is almost completely covered by ice and the study was performed on volcanic detritus present in terminal moraines of the Lautaro Glacier and the tephra on the surface of the O'Higgins Glacier. The terminal moraines of Lautaro Glacier contain fragments of light grey dacite rich in plagioclase and hornblende phenocrysts. Some dacite blocks show prismatic jointing, suggesting an origin of hot emplacement and subsequent rapid cooling, possibly resulted from collapse of a steep lava front. Some samples have glassy groundmass and rhyolite-like flow texture, with presence of mafic inclusions and bread crust bomb texture. The surface of the O'Higgins Glacier is covered by lapilli-size pumice fallout deposit. There are many dirt cones covered by volcanic ash composed of pumice fragments, volcanic glass, quartz, plagioclase, biotite, hornblende, and orthopyroxene. The ash and pumice are similar in chemical composition, both indicating an adakitic signature. At least three layers of fallout deposits have been recognised in parts of the surface of the glacier, which may correspond to the latest known eruptions. Reconocimiento geológico del volcán Lautaro, Patagonia chilena. El volcán Lautaro es el más próximo alPunto Triple de la dorsal de Chile en la Zona Volcánica Austral de los Andes. El edificio volcánico de 3.607 m s.n.m. se destaca como el punto más alto en la parte noroeste del plateau del Campo de Hielo Patagónico Sur. El basamento del volcán está compuesto por metapelitas de bajo grado metamórfico que están atravesadas por cuerpos tabulares constituidos por granitos de hornblenda-biotita. El volcán está casi completamente cubierto por hielo y el estudio se

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“…Field observations, petrologic and geochemical data from the volcano are herein reported. This work complements that of Orihashi et al (2004 …”

supporting

confidence: 70%

“…5). Orihashi et al (2004) presented simple geochemical diagrams for the samples collected from the Lautaro Glacier moraine, localities 1 and 2 (Table 2; Fig. 5A).…”

Section: Preliminary Bulk Chemical Analyses Of the Ash And The Pumicementioning

confidence: 99%

Geologic reconnaissance of Lautaro Volcano, Chilean Patagonia

Motoki¹,

Orihashi²,

Naranjo³

et al. 2010

andgeo

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“…From Hudson, the southernmost volcano of SSVZ, three samples (HD1E1, HD1F1, and H4) were analyzed. HD1E1 and HD1F1 are basalt obtained from terminal moraine of outlet glacier on NNE flank of the edifice, and H4 is a basaltic andesite from pyroclastic flow deposit forming a lower part of the SE caldera (Orihashi et al, 2004). Petrographic descriptions and K-Ar ages of the Hudson samples were presented by Orihashi et al (2004).…”

Section: Sampling Sitesmentioning

confidence: 99%

Boron and other trace element constraints on the slab-derived component in Quaternary volcanic rocks from the Southern Volcanic Zone of the Andes

Shinjoe

Orihashi

Naranjo³

et al. 2013

Geochem. J.

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“…In this study, the radiogenic 40 Ar contents of samples were determined by using the unspiked sensitivity method. In this method, the unknown concentration of 40 Ar contained in a sample is determined by comparing its Ar ratio is equal to the modern atmospheric value of 296 (Orihashi et al, 2004). The K -Ar age of a standard sample of Baba Tuff -2 biotite is concurrently determined by the same method for two times.…”

Section: K-ar Agesmentioning

confidence: 99%

“…The K 2 O contents of eleven samples were determined by XRF analysis with a precision of 0.8%. The relevant analytical procedures and calculation method are described by Orihashi et al (2004), Nagao et al (1984), and Mori and Mashima (2005).…”

Section: K-ar Agesmentioning

confidence: 99%

K-Ar ages of high-magnesian andesite lavas from northern Kyushu, Japan

Miyoshi¹,

Nasu²,

Tajima³

et al. 2008

Journal of Mineralogical and Petrological Sciences

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We determined the K -Ar ages for the high -magnesian andesites from Miocene -Pliocene period from Hikosan and Nagasaki areas in northern Kyushu, Japan. The obtained K -Ar ages of Hikosan and Nagasaki samples are 4.0 -3.6 Ma and 5.8 -3.7 Ma, respectively. These K -Ar ages suggest that the magmatisms of the high -magnesian andesites coincided with the development of the Okinawa Trough. The upwelling of the hot asthenospheric mantle associated with the backarc rifting probably has a close relationship with the origin of the northern -Kyushu high -magnesian andesite magma.

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Quaternary volcanic activity of Hudson and Lautaro volcanoes, Chilean Patagonia: New constraints from K-Ar ages

Cited by 44 publications

References 0 publications

Geologic reconnaissance of Lautaro Volcano, Chilean Patagonia

Geologic reconnaissance of Lautaro Volcano, Chilean Patagonia

Boron and other trace element constraints on the slab-derived component in Quaternary volcanic rocks from the Southern Volcanic Zone of the Andes

K-Ar ages of high-magnesian andesite lavas from northern Kyushu, Japan

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