Temporal and chemical connections between plutons and ignimbrites from the Mount Princeton magmatic center

Mills, Ryan D.; Coleman, Drew S.

doi:10.1007/s00410-012-0843-4

Cited by 59 publications

(71 citation statements)

References 81 publications

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“…If instead the AFG formed from an earlier unrelated magma, the duration of Organ Needle pluton magmatism was 59 ± 33 ka, requiring higher magma fluxes of 0.002-0.003 km 3 /year. These rates are similar to calculated fluxes of other well-studied plutons from magmatic arcs and silicic caldera systems (0.0001-0.003 km 3 /year) (e.g., Davis et al 2012;Matzel et al 2006;Mills and Coleman 2013;Tappa et al 2011). If the Achenback Park tuff and Squaw Mountain tuff are included in the flux, the minimum total plutonic plus volcanic magmatic flux is 0.002 km 3 /year.…”

Section: Magma Fluxes and Plutonic Cooling Ratessupporting

confidence: 83%

“…Temporal constraints on models of ignimbrite formation Tappa et al (2011) andColeman (2013) have argued that the relative timing of plutonism and volcanism in silicic caldera systems can be used to differentiate between end-member models for rhyolite formation. Models for the generation of ignimbrites and shallow level plutonic systems can be broadly described as down-temperature magma crystallization models or up-temperature partial melting models (Bachmann and Bergantz 2008;Mills and Coleman 2013).…”

Section: Isotopic Constraints On Magma Evolution In the Organ Mountainsmentioning

confidence: 99%

“…Models for the generation of ignimbrites and shallow level plutonic systems can be broadly described as down-temperature magma crystallization models or up-temperature partial melting models (Bachmann and Bergantz 2008;Mills and Coleman 2013). In down-temperature models, rhyolitic magmas are formed by differentiation of mafic magmas in crustal chambers or mush zones (e.g., Bergantz 2004, 2008;Cooper and Kent 2014;Halliday et al 1991;Lipman 1984).…”

Section: Isotopic Constraints On Magma Evolution In the Organ Mountainsmentioning

confidence: 99%

“…Many studies have argued that silicic tuffs undergo fractionation in the upper-to mid-crust prior to eruption and that plutons represent the residual solids from this processes (e.g., Bergantz 2004, 2008;Bachmann et al 2007;Hildreth 1981Hildreth , 2004Lipman 1984Lipman , 2007Lipman and Bachmann 2015;Metcalf 2004;Smith 1979). On the other hand, two recent geochronologic studies have documented an offset between the timing of caldera-related volcanic eruptions and crystallization of spatially associated shallow plutons (Mills and Coleman 2013;Tappa et al 2011) . These and earlier studies have suggested that the relative role of volcanism and plutonism may be related to magmatic fluxes, where high flux regimes favor eruption of silicic magmas formed lower in the crust and lower flux regimes favor intrusive crystallization (Glazner et al 2004;Mills and Coleman 2013;Tappa et al 2011).…”

mentioning

confidence: 99%

“…On the other hand, two recent geochronologic studies have documented an offset between the timing of caldera-related volcanic eruptions and crystallization of spatially associated shallow plutons (Mills and Coleman 2013;Tappa et al 2011) . These and earlier studies have suggested that the relative role of volcanism and plutonism may be related to magmatic fluxes, where high flux regimes favor eruption of silicic magmas formed lower in the crust and lower flux regimes favor intrusive crystallization (Glazner et al 2004;Mills and Coleman 2013;Tappa et al 2011).…”

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confidence: 99%

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The link between volcanism and plutonism in epizonal magma systems; high-precision U–Pb zircon geochronology from the Organ Mountains caldera and batholith, New Mexico

Rioux

Farmer

Bowring

et al. 2016

Contrib Mineral Petrol

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of 36.441 ± 0.020 Ma (Cueva Tuff), 36.259 ± 0.016 Ma (Achenback Park tuff), and 36.215 ± 0.016 Ma (Squaw Mountain tuff). An alkali feldspar granite, which is chemically similar to the erupted tuffs, yielded a synchronous weighted mean 206 Pb/ 238 U date of 36.259 ± 0.021 Ma. Weighted mean 206 Pb/ 238 U dates from the larger volume syenitic phase of the underlying Organ Needle pluton range from 36.130 ± 0.031 to 36.071 ± 0.012 Ma, and the youngest sample is 144 ± 20 to 188 ± 20 ka younger than the Squaw Mountain and Achenback Park tuffs, respectively. Younger plutonism in the batholith continued through at least 34.051 ± 0.029 Ma. We propose that the Achenback Park tuff, Squaw Mountain tuff, alkali feldspar granite and Organ Needle pluton formed from a single, long-lived magma chamber/mush zone. Early silicic magmas generated by partial melting of the lower crust rose to form an epizonal magma chamber. Underplating of the resulting mush zone led to partial melting and generation of a highsilica alkali feldspar granite cap, which erupted to form the tuffs. The deeper parts of the chamber underwent continued recharge and crystallization for 144 ± 20 ka after the final eruption. Calculated magmatic fluxes for the Organ Needle pluton range from 0.0006 to 0.0030 km 3 /year, in agreement with estimates from other well-studied plutons. The petrogenetic evolution proposed here may be common to many small-volume silicic volcanic systems.

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Section: Magma Fluxes and Plutonic Cooling Ratessupporting

confidence: 83%

Section: Isotopic Constraints On Magma Evolution In the Organ Mountainsmentioning

confidence: 99%

Section: Isotopic Constraints On Magma Evolution In the Organ Mountainsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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The link between volcanism and plutonism in epizonal magma systems; high-precision U–Pb zircon geochronology from the Organ Mountains caldera and batholith, New Mexico

Rioux

Farmer

Bowring

et al. 2016

Contrib Mineral Petrol

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Zircon U‐Pb geochronology of the Mount Givens Granodiorite: Implications for the genesis of large volumes of eruptible magma

Frazer

Coleman

Mills³

2014

JGR Solid Earth

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The Mount Givens Granodiorite, a large pluton in the central Sierra Nevada batholith, California, is similar in area to zoned intrusive suites yet is comparatively chemically and texturally homogenous. New zircon U-Pb geochronology indicates that the pluton was constructed over at least 7 Ma from 97.92 ± 0.06 Ma to 90.87 ± 0.05 Ma. Combining the new geochronology with the exposed volume of the pluton yields an estimated magma flux of <0.001 km 3 /a. The geochronologic data are at odds with the previously speculated links between plutons such as the Mount Givens Granodiorite and large-volume homogeneous ignimbrites (often termed monotonous intermediates). Existing data indicate that large plutons accumulate at rates of ≤0.001 km 3 /a, 1-2 orders of magnitude less than fluxes calculated for dated monotonous intermediates. If monotonous intermediates are remobilized, erupted plutons accumulated at rates comparable to dated examples, they should preserve a record of zircon growth of up to 10 Ma. Alternatively, the long history of zircon growth recorded in plutons may be erased during the processes of reheating and remobilization that precede supervolcano eruption. However, zircon dissolution modeling, based on hypothetical temperature-time histories for preeruptive monotonous intermediates, indicates that rejuvenation events would not sufficiently dissolve zircon. We suggest that eruptions of monotonous intermediates occur during high magmatic flux events, leaving little behind in the intrusive rock record, whereas low fluxes favor pluton accumulation.

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U–Th–Pb geochronology and thermochronology

2017

Geochronology and Thermochronology

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Temporal and chemical connections between plutons and ignimbrites from the Mount Princeton magmatic center

Cited by 59 publications

References 81 publications

The link between volcanism and plutonism in epizonal magma systems; high-precision U–Pb zircon geochronology from the Organ Mountains caldera and batholith, New Mexico

The link between volcanism and plutonism in epizonal magma systems; high-precision U–Pb zircon geochronology from the Organ Mountains caldera and batholith, New Mexico

Zircon U‐Pb geochronology of the Mount Givens Granodiorite: Implications for the genesis of large volumes of eruptible magma

U–Th–Pb geochronology and thermochronology

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