Quickening the Pulse: Fractal Tempos in Continental Arc Magmatism

Silva, De; Riggs, Nancy R.; Barth, Andrew P.

doi:10.2113/gselements.11.2.113

Cited by 120 publications

(58 citation statements)

References 28 publications

(30 reference statements)

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“…Given the volcanological evidence for episodic magmatism throughout the APVC flare-up35, it is likely that surface uplift from magmatic addition was non-uniform over time. As the peak ∼5 million year flare-up timescale potentially records the time variation of mantle power input into the crust16, we use the record of volcanic volume estimates12 as a proxy for plutonic magmatic flux and estimate isostatic uplift rates over the peak volcanic pulse of the APVC (Fig. 6).…”

Section: Discussionmentioning

confidence: 99%

“…As our buried load model shows, the large wavelength of the APMB does not feel the effects of the flexural rigidity of the upper crust and thus an Airy approximation for our simplified uplift model is appropriate. Because mechanical processes in the crust will filter the power input from the mantle16, there is likely not a linear relationship between mantle melt production and surface eruption rates. However, the ∼5 million years timescale that defines the peak APVC flare-up12 may record the time variability of melt production16, so we average our uplift calculations over this range of changes in volcanic volume.…”

Section: Methodsmentioning

confidence: 99%

“…12). The signal is dominated by an extended pulse of volcanism from 8 to 3 Myr, and this 5 Myr timescale likely correlates with variability in mantle power input16 and thus magmatic thickening of the crust. We convert the volcanic output to its plutonic equivalent using our estimated value of β , and model the isostatic response to melt intrusion over this timescale.…”

Section: Figurementioning

confidence: 96%

“…Pairing topographic data with geochemical constraints on the magmatic system of the APVC, we estimate the volume of the APMB with an isostatic magma production rate model. Finally, we attempt to constrain surface uplift rates of the APVC over its lifetime from 11 Ma using the volcanic record as a proxy for magmatic thickening over million-year long timescales relevant to mantle melt flux16, and place our findings in the context of the known tectonic and geodynamic evolution of the Central Andes between 20 o and 25 o S.…”

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confidence: 99%

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Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body

et al. 2016

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The Altiplano-Puna Magma Body (APMB) in the Central Andes is the largest imaged magma reservoir on Earth, and is located within the second highest orogenic plateau on Earth, the Altiplano-Puna. Although the APMB is a first-order geologic feature similar to the Sierra Nevada batholith, its role in the surface uplift history of the Central Andes remains uncertain. Here we show that a long-wavelength topographic dome overlies the seismically measured extent of the APMB, and gravity data suggest that the uplift is isostatically compensated. Isostatic modelling of the magmatic contribution to dome growth yields melt volumes comparable to those estimated from tomography, and suggests that the APMB growth rate exceeds the peak Cretaceous magmatic flare-up in the Sierran batholith. Our analysis reveals that magmatic addition may provide a contribution to surface uplift on par with lithospheric removal, and illustrates that surface topography may help constrain the magnitude of pluton-scale melt production.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Figurementioning

confidence: 96%

mentioning

confidence: 99%

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Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body

et al. 2016

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“…The long-term Mesozoic evolution of the California arc was characterized by steadystate magmatism and three shorter-duration high-flux magmatic episodes (pulses or flare-ups;Bateman, 1992;Ducea and Barton, 2007;Barth et al, 2013;de Silva et al, 2015). Arc magmatism during the second, Jurassic pulse in the California arc is best recorded by plutonic sequences, but includes widely separated small remnants of a silicic ignimbrite cover sequence.…”

Section: Discussionmentioning

confidence: 99%

Regional and temporal variability of melts during a Cordilleran magma pulse: Age and chemical evolution of the Jurassic arc, eastern Mojave Desert, California

Barth

Wooden

Miller

et al. 2016

Geological Society of America Bulletin

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Intrusive rock sequences in the central and east Mojave Desert segment of the Jurassic Cordilleran arc of the western US record regional and temporal variations in magmas generated during the second prominent pulse of Mesozoic continental arc magmatism. U/Pb zircon ages provide temporal control for describing variations in rock and zircon geochemistry that reflect differences in magma source components. These source signatures are discernible through mixing and fractionation processes associated with magma ascent and emplacement. The oldest well-dated Jurassic rocks defining initiation of the Jurassic pulse are a 183 Ma monzodiorite and a 181 Ma ignimbrite.Early to Middle Jurassic intrusive rocks comprising the main stage of magmatism include two high K calc-alkalic groups; to the north, the deformed 183 to 172 Ma Fort

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Late Jurassic flare‐up of the Coast Mountains arc system, NW Canada, and dynamic linkages across the northern Cordilleran orogen

et al. 2017

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Short‐lived, high‐volume magmatic events or flare‐ups in Cordilleran‐style accretionary systems are presumably triggered by the rapid underthrusting of melt‐fertile lithosphere beneath a continental arc during extreme retroarc shortening. New zircon U‐Pb age and trace element geochemical studies of the Coast Mountains batholith were conducted to test this hypothesis and investigate cross‐orogen linkages between the Coast Mountains arc system and adjacent retroarc elements of the Canadian Cordillera. Late Jurassic (155–147 Ma) granitoids of the Saint Elias plutonic suite in southwestern Yukon were emplaced during a widespread magmatic event and correspond to an intrusive rate of ~350 km2/Myr, analogous to the scale of 160–150 Ma flare‐up activity in the Sierra Nevada batholith. The timing of Late Jurassic high‐volume magmatism was coincident with forearc and intraarc deformation events along the length of the Coast Mountains arc from Alaska to British Columbia. Whole‐rock and zircon rare earth element geochemical results from the Saint Elias plutonic suite confirm that continental lithosphere was a key source component for Late Jurassic granitoids, which strengthens the implied relationship between high‐volume arc magmatism and crustal recycling. Well‐documented episodes of late Middle to early Late Jurassic hinterland thrusting and metamorphism in the Intermontane and Omineca belts of the Canadian Cordillera preceded this high‐volume event and therefore support the hypothesis that retroarc shortening was dynamically linked to flare‐up activity. Late Jurassic magmatism was followed by a 140–125 Ma lull in most of the Coast Mountains batholith, which may be linked to ridge subduction, lithospheric delamination, mantle cooling, or plate reorganization.

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Quickening the Pulse: Fractal Tempos in Continental Arc Magmatism

Cited by 120 publications

References 28 publications

Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body

Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body

Regional and temporal variability of melts during a Cordilleran magma pulse: Age and chemical evolution of the Jurassic arc, eastern Mojave Desert, California

Late Jurassic flare‐up of the Coast Mountains arc system, NW Canada, and dynamic linkages across the northern Cordilleran orogen

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