Mixed Magmas, Mush Chambers and Eruption Triggers: Evidence from Zoned Clinopyroxene Phenocrysts in Andesitic Scoria from the 1995 Eruptions of Ruapehu Volcano, New Zealand

Nakagawa, Mitsuhiro

doi:10.1093/petrology/43.12.2279

Cited by 103 publications

(78 citation statements)

References 49 publications

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“…The textural, zoning and compositional characteristics of clinopyroxene in petrologically and geochemically diverse volcanic and plutonic rocks have been extensively studied over the past 40 years (e.g., Wass, 1979;Duda and Schmincke, 1985;Dobosi et al, 1991;Dobosi and Fodor, 1992;Neumann et al, 1999;Nakagawa et al, 2002;Streck et al, 2002;Marks et al, 2004;Shane et al, 2008;Stroncik et al, 2009;Winpenny and Maclennan, 2011;Jankovics et al, 2012Jankovics et al, , 2016Ubide et al, 2014a, b;Gernon et al, 2016). These detailed mineral-scale studies have inferred the origin of different clinopyroxene populations, from open-and closed-system petrogenetic processes operating in subvolcanic magma storage systems to the evolution and ascent histories of different magmas (replenishment, magma mixing, mingling, xenocryst incorporation, fractional crystallisation and contamination).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Insights into the evolution of an alkaline magmatic system: An in situ trace element study of clinopyroxenes from the Ditrău Alkaline Massif, Romania

Batki

Pál-Molnár

Jankovics

et al. 2018

Lithos

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Clinopyroxene is a major constituent in most igneous rock types (hornblendite, diorite, containing phonolitic (tinguaite) magma. This study shows that antecryst recycling, also described for the first time in Ditrău, is a significant process during magma recharge and demonstrates that incorporated crystals can crucially affect the host magma composition and so whole-rock chemical data should be interpreted with great care.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Insights into the evolution of an alkaline magmatic system: An in situ trace element study of clinopyroxenes from the Ditrău Alkaline Massif, Romania

Batki

Pál-Molnár

Jankovics

et al. 2018

Lithos

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“…The reverse zoning of clinopyroxene suggests that the partly crystallized trachyandesitic magma was invaded by a new batch of basanitic melt, resulting in mineral compositions becoming more magnesium-rich (e.g., Nakagawa et al 2002). The basic composition of the glass in the basanite domain within the mingled dike of the sample Zb12 (Tab.…”

Section: Discussionmentioning

confidence: 99%

Fingerprints of magma mingling processes within the Miocene Zebín tuff cone feeding system (Jičín Volcanic Field, Czech Republic)

Rapprich¹,

Shields²,

Halodová³

et al. 2018

J. Geosci.

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A well-preserved set of partly eroded mid-Miocene scoria cones and tuff cones are exposed in the Jičín Volcanic Field, Czech Republic. Zebín Hill, a formerly quarried tuff cone with an exposed conduit and associated dikes, offers an opportunity to study magmatic processes within the high-level feeding system of a small monogenetic volcano. Two types of dikes and associated "blob-like" intrusions were observed. Pure basanite dikes predominate in the center of the cone, whereas its peripheries were intruded by mingled dikes. The mingled dikes consist of mm-scale basanitic domains enclosed in a network of trachyandesitic dikelets. Locally, hybrid domains with intermediate characteristics were observed. The basanite dikes and basanite enclaves within mingled dikes contain normally-zoned minerals (Fo 90 to Fo 70 olivine, Mg-rich to Mg-poor diopside, labradorite to andesine composition of plagioclase) indicative of basanite magma evolution during ascent. In contrast, the trachyandesite and hybrid enclaves in mingled dikes show reverse zoning of minerals (Mg-poor to Mg-rich diopside, sanidine to oligoclase feldspar composition) indicative of magma hybridization. This study suggests that the Zebín Volcano did not develop from a simple monogenetic system and through a single central axis feeder; rather, Zebín Hill evolved from a complex magma feeding/storage system and through a complex feeder network. We conclude that the simple external structure of a monogenetic volcano may sometimes hide rather complex magmatic plumbing systems encompassing compositionally contrasting rocks/magmas.

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“…These petrographic features indicate an increasing temperature and a change of chemical composition of the low temperature magma accompanying magma mixing (Sakuyama, 1979;Venesky and Rutherford, 1999;Nakagawa et al, 2002;Reubi et al, 2002;Devine et al, 2003) caused by a recharge of more mafic magma.…”

Section: Interpretation Of Petrological Datamentioning

confidence: 99%

Morphometric age and petrological characteristics of volcanic rocks from the Bajawa Cinder Cone Complex, Flores, Indonesia

Sucipta

Takashima

Muraoka

2006

Journal of Mineralogical and Petrological Sciences

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The Bajawa Cinder Cone Complex consists of at least 78 cinder cones, which can be grouped into five morphometric ages. The oldest group, Bajawa 01, is dated between 0.53 and 0.73 Ma. The groups Bajawa 02, 03, and 04 have an age range from 0.41 Ma to 0.51 Ma, 0.32 Ma to 0.40 Ma, and 0.22 Ma to 0.31 Ma, respectively; the youngest cinder cone group, Bajawa 05, is aged between 0 and 0.20 Ma.Three batches of magma have contributed to the long eruptive episode of the complex. Magma mixing and fractional crystallization were important processes in differentiation. Magma mixing may have been caused by recharge of a mafic contributor to form a mixed magma in a temperature range of 836 °C 978 °C and at a pressure of less than 1.25 kbar before eruption.

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Mixed Magmas, Mush Chambers and Eruption Triggers: Evidence from Zoned Clinopyroxene Phenocrysts in Andesitic Scoria from the 1995 Eruptions of Ruapehu Volcano, New Zealand

Cited by 103 publications

References 49 publications

Insights into the evolution of an alkaline magmatic system: An in situ trace element study of clinopyroxenes from the Ditrău Alkaline Massif, Romania

Insights into the evolution of an alkaline magmatic system: An in situ trace element study of clinopyroxenes from the Ditrău Alkaline Massif, Romania

Fingerprints of magma mingling processes within the Miocene Zebín tuff cone feeding system (Jičín Volcanic Field, Czech Republic)

Morphometric age and petrological characteristics of volcanic rocks from the Bajawa Cinder Cone Complex, Flores, Indonesia

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