On the recent bimodal magmatic processes and their rates in the Torfajökull–Veidivötn area, Iceland

Zellmer, Georg F.; Rubin, K. H.; Grönvold, Karl; Jurado-Chichay, Z.

doi:10.1016/j.epsl.2008.02.026

Cited by 62 publications

(44 citation statements)

References 54 publications

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“…226 Ra concentration was measured in one whole rock and one magnetite separate by ID TIMS using previously described methods (Rubin et al 2005;Zellmer et al 2008). Isotope dilution used a calibrated 228 Ra spike (in this case, Hawaii-Raspike #3) that was milked from a 232 Th solution and calibrated against NIST SRM 4966.…”

Section: Analysis Of 226 Ra Concentrations In Whole Rocks and Separatesmentioning

confidence: 99%

See 1 more Smart Citation

Resolving discordant U–Th–Ra ages: constraints on petrogenetic processes of recent effusive eruptions at Tatun Volcano Group, northern Taiwan

Zellmer

Rubin

Miller

et al. 2015

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Section: Analysis Of 226 Ra Concentrations In Whole Rocks and Separatesmentioning

confidence: 99%

“…Pyle et al 1988;Bourdon et al 1994;Turner et al 2000;Condomines et al 2003;Zellmer et al 2008) and 226 Ra-230 Th magnetite dating (cf. Rubin & Zellmer 2009 and references therein).…”

mentioning

confidence: 99%

Resolving discordant U–Th–Ra ages: constraints on petrogenetic processes of recent effusive eruptions at Tatun Volcano Group, northern Taiwan

Zellmer

Rubin

Miller

et al. 2015

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“…Carmichael 1964;Macdonald et al 1990;Nicholson et al 1991;Lacasse et al 2007) to nearsolidus scenarios (crustal melting, e.g. O'Nions & Grönvold 1973;Sigvaldason 1974;Hèmond et al 1988;Sigmarsson et al 1991;Jónasson 1994;Lacasse et al 2007;Martin & Sigmarsson 2007;Zellmer et al 2008). Future studies of melt evolution at ocean ridge and intraplate settings, as well as above subduction zones, will further refine our understanding of the processes and timescales operating during crustal magma transfer, storage and differentiation, and how they are affected by tectonic controls.…”

Section: Considerations Regarding the Tectonic Settingmentioning

confidence: 96%

An introduction to magma dynamics

Zellmer

Annen

2008

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A variety of methods have been employed to decipher magmatic systems, including geophysical, petrological, textural and geochemical approaches, and these elucidate a large variety of characteristics of different plumbing systems and magmatic differentiation processes. A common theme to the papers presented in this book is the observation of transport of small volume magma batches with a relatively high frequency, as opposed to less frequent transport of larger magma volumes that would require storage in large crustal reservoirs for long periods of time. The implications of this observation are discussed in the context of a possible tectonic control on crustal magma dynamics.

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“…Those studies that have used U-series data to constrain time scales of magma storage (sometimes in conjunction with diffusion data) have generally concluded that storage times are short -decades to at most millennia (Bindeman, et al 2012;Bindeman, et al 2006;Sigmarsson 1996;Zellmer, et al 2008). Of these studies, only two have measured ages of crystals, in one case ages of major phases (Zellmer, et al 2008) and in another case zircon (Carley, et al 2011), with the result that major phases appear to be young (less than a few kyr (Zellmer, et al 2008); also see discussion in (Cooper 2009;Rubin and Zellmer 2009)) whereas zircon in general are older (mostly tens of kyr, Carley et al (2011)).…”

Section: Introductionmentioning

confidence: 99%

“…Measurements of Uranium-series disequilibria have been applied to understanding melt generation and storage in Iceland for decades (Bindeman, et al 2012;Bindeman, et al 2006;Condomines, et al 1981;Hemond, et al 1988b;Kokfelt, et al 2003;Kokfelt, et al 2009;Nicholson, et al 1991;Sigmarsson 1996;Sigmarsson, et al 1992a;Sigmarsson, et al 1992b;Sigmarsson, et al 1991;Sims, et al 2013a;Zellmer, et al 2008). Most of the early studies focused on combining 238 U- 230 Th disequilibria with measurements of other isotopic systems (O, Sr, Nd, Pb) in order to examine the role of crustal contamination or assimilation vs. fractional crystallization in producing evolved magmas at Iceland, and the role of contamination vs. mantle heterogeneities in producing the compositional spectrum in Icelandic basalts (Condomines, et al 1981;Hemond, et al 1988b;Nicholson, et al 1991;Sigmarsson, et al 1992a;Sigmarsson, et al 1992b;Sigmarsson, et al 1991).…”

Section: Introductionmentioning

confidence: 99%

Timescales of storage and recycling of crystal mush at Krafla Volcano, Iceland

Cooper

Sims

Eiler

et al. 2016

Contrib Mineral Petrol

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Processes in upper-crustal magma reservoirs such as recharge, magma mixing, recycling of previously-crystallized material, and eruption, affect both the physical state and the chemical composition of magmas. A growing body of evidence shows that crystals in intermediate to silicic volcanic rocks preserve records of these processes that may be obscured due to mixing in the liquid fraction of magmas. Fewer studies have focused on crystals in basaltic lavas, but these show evidence for a more subtle, but still rich record of magmatic processes. We present new 238 U-230 Th-226 Ra data for plagioclase, combined with d 18 O and trace-element measurements of the same crystal populations, from basalts erupted at Krafla Volcanic Center, Iceland. These data document the presence of multiple crystal populations within each sample, with chemical and oxygen-isotope heterogeneity at a variety of scales: within individual crystals, between crystals in a given population, between crystal populations within the same sample, and between crystals in lavas erupted from different vents during the same eruption. Comparison to whole-rock or groundmass data shows that the majority of macroscopic crystals are not in trace-element or oxygen-isotope equilibrium with their host liquids. The most likely explanation for these data is that the macroscopic crystals originated within a highly heterogeneous crystal mush in the shallow magma reservoir system. U-series and diffusion data indicate that the crystals (and therefore the mush) formed recently (likely within a few thousand years of eruption, and with a maximum age of 8-9 ka), and that the crystals resided in their host magma prior to eruption for decades to a few centuries at most. These data, in conjunction with other recent studies, suggest a model where erupted Icelandic magmas are the result of interaction of diverse magmas entering the crust, followed by complex interactions between melts and previously-crystallized material at all crustal levels.

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On the recent bimodal magmatic processes and their rates in the Torfajökull–Veidivötn area, Iceland

Cited by 62 publications

References 54 publications

Resolving discordant U–Th–Ra ages: constraints on petrogenetic processes of recent effusive eruptions at Tatun Volcano Group, northern Taiwan

Resolving discordant U–Th–Ra ages: constraints on petrogenetic processes of recent effusive eruptions at Tatun Volcano Group, northern Taiwan

An introduction to magma dynamics

Timescales of storage and recycling of crystal mush at Krafla Volcano, Iceland

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