New rates of western Pacific island arc magmatism from seismic and gravity data

Dimalanta, Carla B.; Taira, Asahiko; Yumul, Graciano P.; Tokuyama, Hidekazu; Mochizuki, Kimihiro

doi:10.1016/s0012-821x(02)00761-6

Cited by 121 publications

(62 citation statements)

References 21 publications

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“…Reymer and Schubert (1984) estimate long term crustal production to be 20-40 km 3 per km of arc length per Ma, but this estimate has been criticized as too low by a factor of two (Dimilanta et al, 2002), and any such estimates, which are based on the amount of crust that persists through time, are minima with respect to magma additions because they are the net of production after losses due to erosion. A value of 80 km 3 /km/Ma and 35,000 km total arc length gives a magma production rate of approximately 3 km 3 /yr, in accord with other estimates (Dimilanta et al, 2002).…”

Section: Co 2 Emissions From Subaerial Volcanoesmentioning

confidence: 99%

Feedback between deglaciation, volcanism, and atmospheric CO2

Huybers

Langmuir

2009

Earth and Planetary Science Letters

292

268

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Section: Co 2 Emissions From Subaerial Volcanoesmentioning

confidence: 99%

Feedback between deglaciation, volcanism, and atmospheric CO2

Huybers

Langmuir

2009

Earth and Planetary Science Letters

292

268

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“…A strong geoscientific consensus exists that continental crust mostly forms today and over the time that plate tectonics has operated by magmatic additions due to water-induced melting of mantle above subduction zones (Coats 1962;Dimalanta et al 2002). This produces juvenile (intra-oceanic) arc crust, such as that of the Izu-Bonin-Mariana arc, and Figure 3.…”

Section: Crust Formationmentioning

confidence: 99%

“…This may significantly underestimate early arc crustal growth. Recent geophysical studies of the Izu-Bonin-Mariana and Aleutian arcs infer mean crustal growth rates during the past 50 million years of approximately 100 km 3 /km-million years or more, requiring much higher rates early in the history of these arcs (Dimalanta et al 2002;Jicha et al 2006). Scholl and von Huene (2009) calculate that, during its first approximately 10 million years, Aleutian arc crust grew as fast as 500 km 3 /km-million years.…”

Section: Crust Formationmentioning

confidence: 99%

Yin and yang of continental crust creation and destruction by plate tectonic processes

Stern

Scholl

2010

International Geology Review

200

107

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Earth's continental crust today is both created and destroyed by plate tectonic processes, a balance that is encapsulated by the traditional Chinese concept of yin-yang, whereby dualities act in concert as well as in opposition. Yin-yang conceptualizations of crustal growth and destruction are mostly related to plate tectonics; both occur mostly at subduction zones, by arc magmatic creation and by subduction removal. Crust is also created and destroyed by processes unrelated to plate tectonics, including losses by lower crust foundering and additions at hotspots. At present, creation and destruction of continental crust is either in balance (∼3.2 km 3 /year, or 3.2 AU) or more crust is being destroyed than created; the uncertainty comes from unknown deep losses of continental crust at collision zones and due to lower crustal foundering. The yinyang creation-destruction balance changes over a supercontinent cycle, with crustal growth being greatest during supercontinent break-up due to high magmatic flux at new arcs and crustal destruction being greatest during supercontinent amalgamation due to subduction of continental material and increased sediment flux due to orogenic uplift. These conclusions challenge the widely held view that continental crust volume has increased over time due to plate tectonic activity; it is just as likely that this volume has decreased.

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“…As long as this time interval is small compared to the total time, the exact thickness and time interval is unimportant, and the rate of melt generation is controlled by the average mafic magma intrusion rate (Annen & Sparks 2002). For reasons of computing efficiency, the thickness of the modelled sills is 50 m. Intrusion rates of 10, 5, and 2 mm/yr (corresponding to time intervals between sill of 5000, 10 000, and 25 000 yrs respectively) are tested corresponding to realistic rates based on estimates of magma productivities (Crisp 1984;Dimalanta et al 2002;Shaw 1985;White et al 2006). At the end of the simulation, 16 km of mafic magma have been emplaced which corresponds to simulation durations of 1·6 Myr, 3·2 Myr and 8 Myr depending on the intrusion rates.…”

Section: The Sources Of Meltsmentioning

confidence: 99%

The sources of granitic melt in Deep Hot Zones

Annen¹,

Blundy

Sparks

2008

Transactions of the Royal Society of Edinburgh: Earth Sciences

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A Deep Hot Zone develops when numerous mafic sills are repeatedly injected at Moho depth or are scattered in the lower crust. The melt generation is numerically modelled for mafic sill emplacement geometries by overaccretion, underaccretion or random emplacement, and for intrusion rates of 2, 5 and 10 mm/yr. After an incubation period, melts are generated by incomplete crystallisation of the mafic magma and by partial melting of the crust. The first melts generated are residual from the mafic magmas that have low solidi due to concentration of H 2 O in the residual liquids. Once the solidus of the crust is reached, the ratio of crustal partial melt to residual melt increases to a maximum. If wet mafic magma, typical of arc environments, is injected in an amphibolitic crust, the residual melt is dominant over the partial melt, which implies that the generation of I-type granites is dominated by the crystallisation of mafic magma originated from the mantle and not by the partial melting of earlier underplated material. High ratios of crustal partial melt over residual melt are reached when sills are scattered in a metasedimentary crust, allowing the generation of S-type granites. The partial melting of a refractory granulitic crust intruded by dry, high-T mafic magma is limited and subordinate to the production of larger amount of residual melt in the mafic sills. Thus the generation of A-type granites by partial melting of a refractory crust would require a mechanism of selective extraction of the A-type melt.

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New rates of western Pacific island arc magmatism from seismic and gravity data

Cited by 121 publications

References 21 publications

Feedback between deglaciation, volcanism, and atmospheric CO2

Feedback between deglaciation, volcanism, and atmospheric CO2

Yin and yang of continental crust creation and destruction by plate tectonic processes

The sources of granitic melt in Deep Hot Zones

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