The incrementally zoned Miocene Ayagaures ignimbrite (Gran Canaria, Canary Islands)

Jutzeler, Martin; Schmincke, Hans‐Ulrich; Sumita, Mari

doi:10.1016/j.jvolgeores.2010.07.002

Cited by 14 publications

(12 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, Ignimbrite ' A, ' found on Gran Canaria (Canary Islands) exhibits a chemical transition from comendite at the base of the deposit, to comparatively phenocryst-rich trachyte at the top (Troll and Schmincke, 2002). Similar features are observed in other peralkaline deposits of the Canary Islands, such as Ignimbrite 'TL' (Gran Canaria, Sumner and Branney, 2002), the Ayagaures Ignimbrite (Gran Canaria, Jutzeler et al, 2010), and the deposits of Las Cañadas, Tenerife (Wolff and Storey, 1984;Wolff et al, 1990). A chemically zoned fall deposit on Ascension exhibits similar zonation, ranging from trachyte with peralkaline affinity at the base of the deposit, to basaltic trachyandesite at the top (Chamberlain et al, 2016).…”

Section: Zoned Magma Reservoirsmentioning

confidence: 72%

“…%. These models are particularly valuable in peralkaline systems due to the dominance of alkali feldspars during the later stages of fractionation, and were freshly applied in this study to existing chemical data for the following locations: the Azores (Storey, 1981;Renzulli and Santi, 2000), Canary Islands (Troll and Schmincke, 2002;Rodriguez-Losada and Martinez-Frias, 2004;Bryan, 2006;Jutzeler et al, 2010;Clay et al, 2011), Ascension (Chamberlain et al, 2016), Trindade (Siebel et al, 2000), Gough Island (Le , and Bouvet Island (Imsland et al, 1977).…”

Section: Pre-eruptive Conditionsmentioning

confidence: 99%

“…Temperature estimates derived from two-oxide and other models define considerable ranges for each volcanic island for which there are data. The data derived via alkali feldspar-melt models cluster within the broad range of 1,050-850 • C, and include data from the Azores (Jeffery et al, 2016b(Jeffery et al, , 2017, and calculated using the data of Storey, 1981;Renzulli and Santi, 2000), the Canary Islands (calculated in this study using the data of Troll and Schmincke, 2002;Rodriguez-Losada and Martinez-Frias, 2004;Bryan, 2006;Jutzeler et al, 2010;Clay et al, 2011), Bouvet Island (calculated in this study using the data of Imsland et al, 1977), Gough Island (calculated in this study using the data of Le , and Trindade (calculated in this study using the data of Siebel et al, 2000). Specifically, the estimates from Gran Canaria (Canary Islands), Trindade, and a single ignimbrite formation from Terceira, Azores (GVI, Jeffery et al, 2017), lie at lower values of around 700-850 • C. It is noteworthy that temperature estimates derived from alkali feldspar-melt models appear to record generally higher temperature values than the frequently applied two-oxide models, which likely reflects the comparatively earlier crystallization of alkali feldspar, as well as the rapid re-equilibration timescales of coexisting Fe-Ti oxides (e.g., Gardner et al, 1995;Venezky and Rutherford, 1999;Pimentel et al, 2015), meaning that the lower temperatures recorded by Fe-Ti oxide phases reflect the final pre-eruptive magma system and/or syn-eruptive conditions within the plumbing system.…”

Section: Temperaturementioning

confidence: 99%

See 2 more Smart Citations

Peralkaline Felsic Magmatism of the Atlantic Islands

Jeffery

Gertisser

2018

Front. Earth Sci.

View full text Add to dashboard Cite

The oceanic-island magmatic systems of the Atlantic Ocean exhibit significant diversity in their respective sizes, ages, and the compositional ranges of their eruptive products. Nevertheless, almost all of the Atlantic islands and island groups have produced peralkaline felsic magmas, implying that similar petrogenetic regimes may be operating throughout the Atlantic Ocean, and arguably elsewhere. The origins of peralkaline magmas are frequently linked to low-degree partial melting of enriched mantle, followed by protracted differentiation in the shallow crust. However, additional petrogenetic processes such as magma mixing, crustal melting, and contamination have been identified at numerous peralkaline centers. The onset of peralkalinity leads to magma viscosities lower than those typical for metaluminous felsic magmas, which has profound implications for processes such as crystal settling. This study represents a compilation of published and original data which demonstrates trends that suggest that the peralkaline magmas of the Atlantic Ocean islands are generated primarily via extended (up to ∼ 95%), open system fractional crystallization of mantle-derived mafic magmas. Crustal assimilation is likely to become more significant as the system matures and fusible material accumulates in the crust. Magma mixing may occur between various compositional end-members and may be recognized via hybridized intermediate magmas. The peralkaline magmas are hydrous, and frequently zoned in composition, temperature, and/or water content. They are typically stored in shallow crustal magma reservoirs (∼ 2-5 km), maintained by mafic replenishment. Low melt viscosities (1 × 10 1.77 to 1 × 10 4.77 Pa s) facilitate two-phase flow, promoting the formation of alkali-feldspar crystal mush. This mush may then contribute melt to an overlying melt lens via filter pressing or partial melting. We utilize a three-stage model to account for the establishment, development, and termination of peralkaline magmatism in the ocean island magmatic systems of the Atlantic. We suggest that the overall control on peralkaline magmatism in the Atlantic is magma flux rate, which controls the stability of upper crustal magma reservoirs. The abundance of peralkaline magmas in the Atlantic suggests that their development must be a common, but not inevitable, stage in the evolution of ocean islands.

show abstract

Section: Zoned Magma Reservoirsmentioning

confidence: 72%

Section: Pre-eruptive Conditionsmentioning

confidence: 99%

Section: Temperaturementioning

confidence: 99%

See 1 more Smart Citation

Peralkaline Felsic Magmatism of the Atlantic Islands

Jeffery

Gertisser

2018

Front. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…Welding commonly occurs in pumiceous pyroclastic flow deposits (ignimbrites) and some pyroclastic fall deposits, and produces clastic rocks that are inappropriate for sieving (e.g. Freundt, 1999;Kobberger and Schmincke, 1999;Wilson and Hildreth, 2003;Quane and Russell, 2005;Jutzeler et al, 2010). Diagenesis can affect all clastic aggregates and is responsible for converting them to rocks.…”

Section: Effects Of Welding and Diagenesismentioning

confidence: 99%

Grain-size distribution of volcaniclastic rocks 1: A new technique based on functional stereology

Jutzeler

Proussevitch

Allen

2012

Journal of Volcanology and Geothermal Research

View full text Add to dashboard Cite

The power of explosive volcanic eruptions is reflected in the grain size distribution and dispersal of their pyroclastic deposits. Grain size also forms part of lithofacies characteristics that are necessary to determine transport and depositional mechanisms responsible for producing pyroclastic deposits. However, the common process of welding and rock lithification prevents quantification of grain size by traditional sieving methods for deposits in the rock record. Here we show that functional stereology can be used to obtain actual 3D volume fractions of clast populations from 2D cross-sectional images. Tests made on artificially consolidated rocks demonstrate successful correlations with traditional sieving method. We show that the true grain size distribution is finer grained than its representation on a random 2D section. Our method allows the original size of vesicular pumice clasts to be estimated from their compacted shapes. We anticipate that the original grain-size distribution of welded ignimbrites can also be characterized by this method. Our method using functional stereology can be universally applied to any type of consolidated, weakly to non-deformed clastic material, regardless of grain size or age and therefore has a wide application in geology.

show abstract

“…They demonstrated that for non-hydrated peralkaline rocks, FK/A and P.I. correlate strongly, and that FK/A may be useful to assess Na 2 O loss for a wide variety of peralkaline suites (e.g., Jutzeler et al, 2010;Macdonald et al, 2011b;Marshall et al, 2009;Ren et al, 2006;Thorarinsson et al, 2011). A plot of FK/A versus P.I.…”

Section: Assessment Of Post-crystallization Element Mobilitymentioning

confidence: 99%