Primitive andesites from the Taupo Volcanic Zone formed by magma mixing

Beier, Christoph; Haase, Karsten M.; Brandl, Philipp A.; Krumm, Stefan

doi:10.1007/s00410-017-1354-0

Cited by 41 publications

(20 citation statements)

References 89 publications

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“…This provides an opportunity interrogate the mantle-derived melt input via the 87 Sr/ 86 Sr ratio of plagioclase as it grew. Similarly, Beier et al (2017) reported mineralogical and O-isotopic evidence for open-system magmatic processes in the genesis of magma erupted at Pukeonake. This study reveals the wide intra-and inter-crystal Sr isotopic heterogeneity of the plagioclase cargo in porphyritic andesites.…”

Section: Introductionmentioning

confidence: 84%

“…All Red Crater and Pukeonake rocks display relative enrichments in large ion lithophile elements (LILE) and depletions in high field strength elements (HFSE) typical of subduction zone magmas (Shane et al 2017;Beier et al 2017). The Red Crater deposits can be grouped into two temporal intervals with distinct geochemical and isotopic characteristics (Fig.…”

Section: Geologic Setting and Samplesmentioning

confidence: 99%

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The prevalence of plagioclase antecrysts and xenocrysts in andesite magma, exemplified by lavas of the Tongariro volcanic complex, New Zealand

Shane

Cocker

Coote

et al. 2019

Contrib Mineral Petrol

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Beneath subduction zone volcanoes, the parental magmas are thoroughly blended during temporary storage in the crust via repeated heating and mixing from new inputs of magma. To obtain a clearer picture of magma assembly, we employed a sub-crystal-scale Sr-isotope analysis, coupled with textural and geochemical data, on plagioclase phenocrysts in basaltic andesite and andesite erupted from the Tongariro volcanic complex, New Zealand. Deposits from two neighbouring vents were examined: (1) 0.3-3.4 ka lava flows of the polygenetic Red Crater volcano and (2) 26 ka pyroclastics of the monogenetic Pukeonake scoria cone. Despite the differences in eruptive styles and history of the two volcanoes, the plagioclase growth histories are similar. One common phenocryst type comprises of a resorbed core zone (variously, ~ An 50-70) surrounded by a sieve-textured mantle/rim of higher An (~ 80), Fe and Mg contents. Other phenocrysts have resorbed calcic cores (~ An 70-90). In situ 87 Sr/ 86 Sr analyses reveal a wide isotopic range (~ 0.7044-0.7060 for pre-1.8 ka Red Crater; ~ 0.7044-7057 for post-1.8 ka Red Crater; ~ 0.7047-0.7055 for Pukeonake). Most of the values are higher than that of the host bulk rock (87 Sr/ 86 Sr ~ 0.7049-0.7051 for pre-1.8 ka Red Crater; 0.7045-0.7046 for post-1.8 ka Red Crater; 0.7048 for Pukeonake). The variation within some individual phenocrysts is comparable to that of the entire population. The higher 87 Sr/ 86 Sr ratios are related relic phenocryst cores, indicating that their parental source was more radiogenic than the host magma. In contrast, their sieve-textured mantle/rim zones have lower 87 Sr/ 86 Sr ratios (~ 0.7045-0.7049), similar that of their host rock. These features record magma mixing. Less than 10% of phenocryst interiors are cognate (autocrysts) with the host rock based on their high 87 Sr/ 86 Sr ratio. Some phenocrysts are likely to be xenocrysts derived from the disintegration of deep crustal meta-igneous rocks. However, based on textures consistent with growth from a melt, the majority are antecrysts from intrusive forerunners and/or crystal mush zones, entrained during eruption or storage. Overall, the andesites are a product of crystal-poor magmas of mantle or lower crustal origin carrying phenocrysts from mostly crustal sources. The magma system likely comprised of a series of semi-isolated melt pods or crystal mush zones in a larger network of intrusions of various ages and states of solidification, possibly hosted in country rock of various compositions. Resorption of the sieve-textured mantle zones on the phenocrysts and growth of a normally zoned outermost rim represents a final period of fractional crystallization in the newly homogenised melt following the ascent and intrusion of mafic magma. Hence, the final tipping point to eruption may have involved crystallization-induced volatile exsolution and degassing.

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Section: Introductionmentioning

confidence: 84%

Section: Geologic Setting and Samplesmentioning

confidence: 99%

The prevalence of plagioclase antecrysts and xenocrysts in andesite magma, exemplified by lavas of the Tongariro volcanic complex, New Zealand

Shane

Cocker

Coote

et al. 2019

Contrib Mineral Petrol

View full text Add to dashboard Cite

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“…1A). Similar petrological and geochemical features suggest a common mode of magma genesis for HMAD eruptives from White Island (Mandon, 2017), Pukeonake (Beier et al, 2017) and Hauhungatahi (Cameron et al, 2010) (Fig. 1A).…”

Section: Origins Of Ruapehu Hmad Magmasmentioning

confidence: 61%

Rapid assembly of high-Mg andesites and dacites by magma mixing at a continental arc stratovolcano

Conway

Chamberlain

Harigane

et al. 2020

Geology

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Studies of pre-eruptive processes at active volcanoes require precise petrochronological constraints if they are to contribute to hazard assessment during future eruption events. We present petrological and geochemical data and orthopyroxene diffusion time scales for samples from Late Pleistocene high-Mg andesite-dacite lavas (Mg# 53–69) at Ruapehu volcano, New Zealand, as a case study of rapid magma genesis and eruption at a continental arc stratovolcano. Assembly of Ruapehu high-Mg magmas involved the mixing of primitive magmas plus entrained mantle-equilibrated olivines with mid-crustal felsic mush bodies, yielding hybridized magmas with ubiquitous pyroxene reverse-zoning patterns. Orthopyroxene Fe-Mg interdiffusion time scales linked to quantitative crystal orientation data show that most lavas erupted <10 days after resumption of crystal growth following magma mixing events. The eruption of lavas within days of mixing events implies that pre-eruptive warnings may be correspondingly short.

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“…Formation of mantle pyroxenite consumes tens of percent of silicic slab material, and results in the presence of melts that contain contributions from both slab and mantle , in which only a few elements, such as Mg, Fe, Ti and the tell-tale heavy REE, remain mantlecontrolled 151,160,161,179 . This process could create high-Mg# andesites 151 independent from melt water content in all arc settings, such as the TMVB 140 , Kamchatka [180][181][182] , New Zealand [183][184][185] , the Western Aleutians 186 and the Cascades [187][188][189][190] The second model that has been proposed builds on the idea of slab diapirs and mélanges 9,51,52,191 , which are predicted to buoyantly rise from a layer of silicic, lowdensity crustal material on top of the slab, between the dense eclogitic below and mantle peridotite above 51,52 . Silicic diapirs can either rise to the base of the crust where they 'relaminate' 9,191 , or erupt as arc magmas after reactive interaction and melting in the mantle wedge [5][6][7] .…”

Section: Comparison Of Alongstrike Radiogenic Isotope Trends In the Amentioning

confidence: 99%

Subduction erosion and arc volcanism

Straub

Gómez-Tuena

Vannucchi

2020

Nat Rev Earth Environ

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Tectonic or subduction erosion refers to the removal of upper plate material from the forearc at convergent margins. Subduction erosion has been suggested to represent a major process associated with the transfer of crustal material into the Earth's mantle at subduction zones 1-4. However, few studies have attempted to trace the fate of eroded forearc crust beneath volcanic arcs, where the eroded crust might first emerge after mixing with the upper mantle, owing to the formidable challenge associated with quantifying the rate of subduction erosion and the contribution of eroded crust to arc magmas. In this Review, we summarize the evidence for subduction erosion at convergent margins and show that, through integration of geochemical and geological data in arc settings where critical crustal lithologies can be accessed, quantification of the contribution of eroded forearc crust to arc magmas is possible 5-8. We further emphasize the importance of establishing arc-forearc compositional links, and illustrate the role of arc petrogenetic models for determining whether the eroded forearc crust contributes substantially (that is, greater than a few percent) to the construction of new arc crust in subduction zones 5,9 , or whether it is primarily exported to the deeper mantle. [H1] INTRODUCTION

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Primitive andesites from the Taupo Volcanic Zone formed by magma mixing

Cited by 41 publications

References 89 publications

The prevalence of plagioclase antecrysts and xenocrysts in andesite magma, exemplified by lavas of the Tongariro volcanic complex, New Zealand

The prevalence of plagioclase antecrysts and xenocrysts in andesite magma, exemplified by lavas of the Tongariro volcanic complex, New Zealand

Rapid assembly of high-Mg andesites and dacites by magma mixing at a continental arc stratovolcano

Subduction erosion and arc volcanism

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