The Fish Canyon Magma Body, San Juan Volcanic Field, Colorado: Rejuvenation and Eruption of an Upper-Crustal Batholith

Bachmann, Olivier; Dungan, M. A.; Lipman, Peter W.

doi:10.1093/petrology/43.8.1469

Cited by 365 publications

(185 citation statements)

References 80 publications

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“…Ba zoning has been reproduced experimentally by temperature fluctuations in a chemically closed-system [58]. These Ba zoning patterns recording temperature fluctuation in magmas have been observed in other volcanic systems [59,60], and are in agreement with the inverse zoning patterns in plagioclase. at different stratigraphic levels of the unit).…”

Section: Feldsparssupporting

confidence: 76%

The petrologic evolution and pre-eruptive conditions of the rhyolitic Kos Plateau Tuff (Aegean arc)

Bachmann

2010

Open Geosciences

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Abstract:The Kos Plateau Tuff is a large (>60 km 3 ) and young (160 k.y.) calc-alkaline, high-SiO 2 rhyolitic ignimbrite from the active Kos-Nisyros volcanic center in the Aegean arc (Greece). Combined textural, petrological and geochemical information suggest that (1) the system evolved dominantly by crystal fractionation from (mostly unerupted) more mafic parents, (2) the magma chamber grew over 250 000 years at shallow depth (∼1.5-2.5 kb) and was stored as a H 2 O-rich crystalline mush close to its solidus (∼670-750°C), (3) the eruption occurred after a reheating event triggered by the intrusion of hydrous mafic magma at the base of the rhyolitic mush. Rare banded pumices indicate that the mafic magma only mingled with a trivial portion of resident crystal-rich rhyolite; most of the mush was remobilized following partial melting of quartz and feldspars induced by advection of heat and volatiles from the underplated, hotter mafic influx.

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Section: Feldsparssupporting

confidence: 76%

The petrologic evolution and pre-eruptive conditions of the rhyolitic Kos Plateau Tuff (Aegean arc)

Bachmann

2010

Open Geosciences

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“…A villányi előtérben megfigyelhető piroklasztitokat kristálygazdagságuk, dácitos jellegük és látszólagos kémiai homogenitásuk alapján a monoton intermedier képződmé -nyekhez soroljuk. Ilyen kőzetként ismert például a Fish Canyon Tufa (USA, BACHMANN et al 2002) Az akcesszóriák közül a cirkon korhatározási szempontból jelentős, a gránát viszont utalhat geodinamikai környe zetben történt változásra (10. ábra). A terület egyes fúrásaiban (Egerág-7, Szalánta-3) feltételezhetően magmás eredetű gránátkristályok jelennek meg piroklasztitban, amelyek összetételét JAKAB (2005) túlnyomórészt almandin ként határozta meg.…”

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A Gyűrűfűi Riolit Formáció kőzettani vizsgálatának eredményei a Villányi-hegység északi előterében

Szemerédi¹,

Varga²,

Lukács³

et al. 2017

Földt. Közl.

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In this study rocks samples of Gyűrűfű Rhyolite Formation were observed from deep drillings at northern foreland of the Villány Mts. Remained cores and thin sections from Bisse-1, Peterd-1, Szava-1, Vókány-2, Egerág-7 and Szalánta-3 drillings were available in varying -but generally restricted -number for the petrographic reambulation. Based on the new petrographic descriptions and the previous reports, 2 main lithological groups were distinguished in the area: lava rocks and pyroclastites. Based on the mineralogical composition and texture the following rock types are distinguishable:(1) pyroclastites with rhyolitic composition (Peterd-1; Vókány-2, upper section; Egerág-7, upper section; Szalánta-3, upper section and presumably Bisse-1, upper section); (2) lava rocks with rhyolitic composition (Bisse-1, lower section; Szava-1; Vókány-2, lower section); (3) lava rocks with dacitic composition (Egerág-7, lower section); (4) lava rocks with rhyodacitic-dacitic composition (Szalánta-3, lower section).At northern foreland of the Villány Mts, the magmatic activity started with lava flows (creating a rhyolitic lava dome/lava flow in the area of Szava and Bisse-Vókány and rhyodacitic-dacitic lava rocks in the area of Egerág-Szalánta) and was followed by explosive eruptions, covering the area with thick ignimbrite sheets.Pyroclastites explored by drillings have rhyolitic composition at present but their crystal-rich character may refer to dacitic initial melt composition; resembling to the so-called crystal-rich monotoneous intermediates. These products are connected to reactivated crystal mush from middle-upper crustal magma reservoirs. Considering that pyroclastites were affected by a posterior K-metasomatic process (e.g. adularization of feldspars in rocks of Peterd-1), the modification of their chemical composition cannot be excluded. Further studies of the garnet crystals observed in the pyroclastites of Egerág-7 and Szalánta-3 deep drillings could help to refine the nature of Permian volcanism in the area.Our new results suggest that at northern foreland of the Villány Mts -similarly to analogous regions of European Variscides (e.g. Intra-Sudetic Basin, Southern Permian Basin, Muntii Apuseni) -a chemically complex, possibly long lasting volcanic system worked and produced the rock materials that were formerly handled as one separate stratigraphical marker formation. For further investigation of this system, radiometric age dating of each borehole (U-Pb, zircon) and whole rock (major and trace elements) geochemical analyses are planned.Keywords: Villány Mountains, Gyűrűfű Rhyolite, Permian, pyroclastite, lava rock, garnet, K-metasomatism ÖsszefoglalásMunkánkban a Gyűrűfűi Riolit Formáció Villányi-hegység északi előterében mélyfúrások által feltárt kőzeteit vizsgáltuk. A Bisse-1, a Peterd-1, a Szava-1, a Vókány-2, az Egerág-7 és a Szalánta-3 fúrásokból változó, de alapvetően korlátozott mennyiségű fúrómag és vékonycsiszolat állt rendelkezésre a kőzettani reambulációhoz. Petrográfiai megfigyeléseink, valamint...

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“…The approach described above must be applied with caution in such cases, as the dynamics of the incoming primitive magma is more likely to be described as flow through a porous medium (mush) than as fluid mingling and mixing. Nonetheless, there is some evidence for crystal-poor silicic magma reservoirs to be reactivated as well (Bachmann et al 2002;Deering et al 2011;Huber et al 2012;Sliwinski et al 2015;Wolff et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Magma Chamber Rejuvenation: Insights from Numerical Models

Montagna

Papale

Longo

et al. 2017

Advances in Volcanology

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Most volcanic systems on Earth are characterized by chemically different magmas that can be found in the erupted products throughout their history. The reasons are multiple, including variations in the mantle source and/or crustal assimilation, as well as shallower processes such as fractional crystallization or mixing and mingling. Magma chamber rejuvenation indicates the processes that happen whenever a magma intrudes from the mantle to shallower depths and encounters an already established storage zone (i.e. a magma chamber or reservoir). Magmas rising from depth are typically characterized by higher temperatures, larger volatile contents and more primitive, mantle-like compositions than those residing in the shallow crust. The interaction with magmas that have already resided at shallower depths for a while (years to thousands of years) varies the physical and chemical properties of both the involved magmatic end-members. Typically, volatile-rich magmas coming from depth are lighter than degassed shallow magma; therefore, a gravitational instability sets in as the two come into contact, which generates convection and thus intense mingling and mixing among the two. These dynamic interactions cause variations in the physical and chemical properties of the magmas themselves, as well as in the stress conditons both inside the reservoir and in the host rock. The volcanic system as a whole enters an unrest scenario, that can evolve to eruption or not depending on the specific conditions. Numerical simulations of the dynamics within magmatic systems can shed light on the features of magma chamber rejuvenation, providing the time

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The Fish Canyon Magma Body, San Juan Volcanic Field, Colorado: Rejuvenation and Eruption of an Upper-Crustal Batholith

Cited by 365 publications

References 80 publications

The petrologic evolution and pre-eruptive conditions of the rhyolitic Kos Plateau Tuff (Aegean arc)

The petrologic evolution and pre-eruptive conditions of the rhyolitic Kos Plateau Tuff (Aegean arc)

A Gyűrűfűi Riolit Formáció kőzettani vizsgálatának eredményei a Villányi-hegység északi előterében

Magma Chamber Rejuvenation: Insights from Numerical Models

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