Correlated Sr Isotope and Geochemical Variations in Basalts and Basaltic Andesites from Guatemala

Grant, Norman K.; Rose, W. I.; Fultz, L.A.

doi:10.1007/978-1-4684-7335-3_10

Cited by 7 publications

(2 citation statements)

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“…The period of resumed and composite cones formed again, constructing the data and the manuscript was The mafic lavas are modified mantle mate-difficult and long and the help of Julene Erickrials, affected by evolution in magma ponds at son was heroic through the many drafts. George or near the base of the crust ( Grant et al, 1984 ) Walker did a superb job at editing out the extra as well as at shallower levels. We suggest that words of all four authors.…”

Section: Amatitlanmentioning

confidence: 99%

Quaternary silicic pyroclastic deposits of Atitlán Caldera, Guatemala

Rose

Newhall

Bornhorst

et al. 1987

Journal of Volcanology and Geothermal Research

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Atitl~n caldera has been the site of several silicic eruptions within the last 150,000 years, following a period of basalt/andesite volcanism. The silicic volcanism began with 5-10 km ~ of rhyodacites, erupted as plinian fall and pyroclastic flows, about 126,000 yr. B.P. At 85,000 yr. B.P. 270-280 km 3 of compositionally distinct rhyolite was erupted in the Los Chocoyos event which produced widely dispersed, plinian fall deposits and widespread, mobile pyroclastic flows. In the latter parts of this eruption rhyodacite and minor dacite were erupted which compositionally resembled the earliest silicic magmas of the Atitldn center. As a result of this major eruption, the modern Atitl~n (III) caldera formed. Following this event, rhyodacites were again erupted in smaller (5-13 km 3) volumes, partly through the lake, and mafic volcanism resumed, forming three composite volcanoes within the caldera. The bimodal mafic-/silicic Atitl~in volcanism is similar to that which has occurred elsewhere in the Guatemalan Highlands, but is significantly more voluminous. Mafic lavas are thought to originate in the mantle, but rise, intrude and underplate the lower crust and partly escape to the surface. Eventually, silicic melts form in the crust, possibly partly derived from underplated basaltic material, rise, crystallize and erupt. The renewed mafic volcanism could reflect either regional magmato-tectonic adjustment after the large silicic eruption or the onset of a new cycle.

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Section: Amatitlanmentioning

confidence: 99%

Quaternary silicic pyroclastic deposits of Atitlán Caldera, Guatemala

Rose

Newhall

Bornhorst

et al. 1987

Journal of Volcanology and Geothermal Research

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“…Several models have been proposed to explain the origin of dacitic rocks in volcanic systems; these include a simple crystal fractionation of basaltic or andesitic parental magmas (Berman, 1981;Reid & Cole, 1983), mixing between rhyolitic and basaltic magmas (Eichelberger, 1975;Gerlach & Grove, 1982), crustal contamination of mafic magmas (Francis et al, 1980;Harmon et al, 1981;Grant et al, 1984), and partial melting of the lower crust (Reid & Cole, 1983;Grant et al, 1984). Recent petrological studies have suggested that silicic magmas are probably produced by a combined process of fractionation and assimilation (Hopson & Mattinson, 1990;Grove et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

A 2.5 ka History of Dacitic Magmatism at Nevado de Toluca, Mexico: Petrological, 40Ar/39Ar Dating, and Experimental Constraints on Petrogenesis

Arce¹,

Macías²,

Gardner³

et al. 2005

Journal of Petrology

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After 11Á5 ka of quiescence (24Á5-13 ka), the Nevado de Toluca volcano started a 2500 year period of activity. This period was characterized by a dome destruction event at 13 ka, a small Plinian event at 12Á1 ka, and a large Plinian eruption at 10Á5 ka. About 10 km 3 of magma was erupted that was homogeneous in composition (63Á3-65Á7 SiO 2 wt % whole-rock) and in mineralogy. Pumice consists of plagioclase (An 30-59) > orthopyroxene (En 56-59) > hornblende) Fe-Ti oxides þ rare apatite (in opx) þ biotite, set in a rhyolitic matrix (72-76 SiO 2 wt %). 40 Ar/ 39 Ar analysis of single biotite crystals yielded ages (0Á81-4Á7 Ma), that do not correspond to eruption ages. The biotite represents partially assimilated xenocrysts, which could have resided in the magma for only a short period of time. Mineral chemical data, coupled with hydrothermal experiments, indicate that prior to eruption the dacitic magma stagnated at a depth of 4Á5-6 km below the summit at water pressures of 160-210 MPa and a temperature of 824 AE 12 C on the basis of Fe-Ti oxide thermometry, and under watersaturated conditions. To stabilize a homogeneous magma body of >10 km 3 at 824 C in the upper crust, we propose that reheating of the dacitic reservoir by hotter magma batches was able to maintain the equilibrium between the temperature of the magma and the assimilation of wall-rock over a period of 2500 years. Based on similarities among the juvenile products, we suggest that the three eruptions were fed from the same magma body.

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Common Characteristics of Paired Volcanoes in Northern Central America

Halsor¹,

Rose²

1989

Collected Reprint Series

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Four pairs of active volcanoes along the northern Central American volcanic front have erupted basalt-andesite magmas that show consistent intrapair behavioral and compositional differences. These differences are found in records of volcanic activity and complete major and minor element data on over 200 samples. From northwest to southeast along the volcanic front the four volcano pairs are Cerro Quemado-Santa Maria, Tolim•n-Atitl•n, Acatenango-Fuego, and Santa Ana-Izalco. The volcano pair relations help explain compositional differences, apart from those reflecting variation in crustal thickness of about 15 km Sciences,

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Correlated Sr Isotope and Geochemical Variations in Basalts and Basaltic Andesites from Guatemala

Cited by 7 publications

References 0 publications

Quaternary silicic pyroclastic deposits of Atitlán Caldera, Guatemala

Quaternary silicic pyroclastic deposits of Atitlán Caldera, Guatemala

A 2.5 ka History of Dacitic Magmatism at Nevado de Toluca, Mexico: Petrological, 40Ar/39Ar Dating, and Experimental Constraints on Petrogenesis

Common Characteristics of Paired Volcanoes in Northern Central America

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