Remelting in caldera and rift environments and the genesis of hot, “recycled” rhyolites

Simakin, A. G.; Bindeman, Ilya N.

doi:10.1016/j.epsl.2012.04.011

Cited by 53 publications

(36 citation statements)

References 53 publications

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“…Such anomalous low  18 O values can be attributed to the presence of meteoric water in magmatic environments, which could have been introduced by melting of hydrothermally altered volcanic rocks (e.g. Watts et al, 2011;Simakin and Bindeman, 2012).…”

Section: Evolution From Eocene Normal Arc Calc-alkaline Magmatism Tomentioning

confidence: 99%

Long-lived, stationary magmatism and pulsed porphyry systems during Tethyan subduction to post-collision evolution in the southernmost Lesser Caucasus, Armenia and Nakhitchevan

et al. 2016

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Section: Evolution From Eocene Normal Arc Calc-alkaline Magmatism Tomentioning

confidence: 99%

Long-lived, stationary magmatism and pulsed porphyry systems during Tethyan subduction to post-collision evolution in the southernmost Lesser Caucasus, Armenia and Nakhitchevan

et al. 2016

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“…Depleted δ 18 O SRPYP magmas are essentially recycled products of isotopically heavier δ 18 O SRPYP magmas, formed when earlier volcanic rocks were hydrothermally altered and then re-introduced into the magma chamber through caldera collapse (Hildreth et al, 1984;Bindeman et al, 2007;Simakin and Bindeman, 2012). Each successive caldera collapse leads to progressively more depleted magmatic 18 O values consistent with mineral textures and zircon agedata reflecting the multi-stage nature of this cannibalisation process (Watts et al, 2011).…”

Section: Discussionmentioning

confidence: 91%

“…Notably, in the case of the Talbot rhyolites, the rejuvenated upper crust almost entirely comprised felsic material representing earlier hydrothermally altered and buried volcanic rocks and unerupted chamber material, similar to some of the 18 O-depleted rhyolite systems modelled by Simakin and Bindeman (2012). However, the Talbot rhyolites differ from other 18 O-depleted rhyolite systems in that the rejuvenated crust itself had an extremely short residence, incorporating little or no material that was ultimately derived through melting of older 'pre-Giles' basement or countryrock.…”

Section: Discussionmentioning

confidence: 99%

“…Dufek and Bergantz, 2005;Annen, 2009;Annen et al, 2006;Leeman et al, 2008) -particularly at the >10 km depths considered here. More complex models involving convective melting of roof-rocks into silicic chambers underplated by mafic magmas (Simakin and Bindeman, 2012) may provide some solutions to these thermal problems. In the case of the Talbot rhyolite system, however, it is likely that the long-term elevated geotherm inherited from preceding UHT evolution of the Musgrave Province was a critical factor in thermally priming the crust.…”

Section: Discussionmentioning

confidence: 99%

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Syn-volcanic cannibalisation of juvenile felsic crust: Superimposed giant 18O-depleted rhyolite systems in the hot and thinned crust of Mesoproterozoic central Australia

Smithies

Kirkland

Cliff

et al. 2015

Earth and Planetary Science Letters

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“…Injection of new magma provides heat and mass that keeps magma bodies above their solidus temperatures, assimilate country rock, and increase the volumes of eruptible magma (e.g., Spera and Bohrson 2004;Beard et al 2005;Simakin and Bindeman 2012). Such magma recharge events can sometimes trigger eruptions as mixing of the different magmas results in exsolution of volatiles (e.g., Eichelberger 1980), overturning of the magmas (e.g., Ruprecht et al 2008), and the generation of overpressures within the chamber (e.g., Sparks et al 1977;Folch and Marti 1998).…”

Section: Introductionmentioning

confidence: 99%

Thermal and rheological controls on the formation of mafic enclaves or banded pumice

Andrews

Manga

2014

Contrib Mineral Petrol

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Magma mixing can occur in a fluid manner to produce banded pumice or in a brittle manner to form enclaves. We propose that the critical control on mixing style is a competition between developing networks of crystals in the intruding magma that impart a strength to the magma and melting and disrupting those networks in the host. X-ray computed tomography analysis demonstrates that banded pumice from the 1915 Mt. Lassen eruption lacks crystal networks. In contrast, rhyodacite hosts with mafic enclaves from Chaos Crags contain welldeveloped networks of large crystals. We present a onedimensional conductive cooling model that predicts mixing style, either ductile or brittle, as a function of magma compositions, temperatures, and the size of the intruding dike. Our model relies on three assumptions: (1) Mixing is initiated by the injection of a hot dike into a cooler magma body with a yield strength; (2) when magma crystallinity exceeds a critical value, 13 vol% plagioclase, the magma develops a yield strength; and (3) when total crystallinity exceeds 40 vol%, the magma has a penetrative crystal network and is effectively solid. Importantly, because the two magmas are of different compositions, their crystallinities and viscosities do not have the same variations with temperature. As the intruding magma cools, it crystallizes from the outside in, while simultaneously, host magma temperature near the intruder rises. Mixing of the two magmas begins when the host magma is heated sufficiently to (1) disrupt the crystal network and (2) initiate convection. If the shear stress exerted by the convecting host magma on the dike is greater than the yield strength of the dike margin (and dike crystallinity does not exceed 40 %), then fluid mixing occurs, otherwise enclaves form by brittle deformation of the dike. Application of the model to magma compositions representative of Lassen and Chaos Crags shows that emplacement of dikes \1 m thick should produce enclaves, whereas thicker dikes should generate fluid mixing and form banded pumice within days to weeks of emplacement. Similar relationships apply to other modeled magmatic systems, including Pinatubo, Unzen, and Ksudach/Shtuybel' volcanoes. For all studied systems, the absolute size of the intruding dike, not just its proportion relative to the host, influences mixing style.

show abstract

Remelting in caldera and rift environments and the genesis of hot, “recycled” rhyolites

Cited by 53 publications

References 53 publications

Long-lived, stationary magmatism and pulsed porphyry systems during Tethyan subduction to post-collision evolution in the southernmost Lesser Caucasus, Armenia and Nakhitchevan

Long-lived, stationary magmatism and pulsed porphyry systems during Tethyan subduction to post-collision evolution in the southernmost Lesser Caucasus, Armenia and Nakhitchevan

Syn-volcanic cannibalisation of juvenile felsic crust: Superimposed giant 18O-depleted rhyolite systems in the hot and thinned crust of Mesoproterozoic central Australia

Thermal and rheological controls on the formation of mafic enclaves or banded pumice

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