Effects of repetitive emplacement of basaltic intrusions on thermal evolution and melt generation in the crust

Annen, Catherine; Sparks, R. S. J.

doi:10.1016/s0012-821x(02)00929-9

Cited by 528 publications

(309 citation statements)

References 58 publications

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“…In the case of break-down of hornblende (e.g., metabasalts) in which Ba, La and Nb are moderately incompatible, so the produced felsic melt will have similar Ba/La and Ba/Nb ratios to that of its protolith. Numerical modeling results also suggest that invasion of hydrous mantlederived magmas can hardly trigger remelting of refractory crustal protoliths, such as amphibolites and mafic granulite (Annen and Sparks, 2002).…”

Section: Crustal Contamination or Afc Processesmentioning

confidence: 96%

Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

Guo

et al. 2016

Lithos

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Section: Crustal Contamination or Afc Processesmentioning

confidence: 96%

Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

Guo

et al. 2016

Lithos

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“…Thermal modelling of intrusion-related thermal disturbances contend that thermal anomalies usually subside after < 10 Myr, independent of crustal parameters used (e.g. Annen and Sparks 2002;Bodorkos et al 2002). Therefore, the long duration (~ 60 Myr) of HT conditions in the Kinzigite Formation is unlikely to have been caused by any single intrusion such as the Mafic Complex.…”

Section: Implications For the Interpretation Of The Metamorphic Evolumentioning

confidence: 99%

Zircon ages in granulite facies rocks: decoupling from geochemistry above 850 °C?

Kunz

Regis

Engi

2018

Contrib Mineral Petrol

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Granulite facies rocks frequently show a large spread in their zircon ages, the interpretation of which raises questions: Has the isotopic system been disturbed? By what process(es) and conditions did the alteration occur? Can the dates be regarded as real ages, reflecting several growth episodes? Furthermore, under some circumstances of (ultra-)high-temperature metamorphism, decoupling of zircon U-Pb dates from their trace element geochemistry has been reported. Understanding these processes is crucial to help interpret such dates in the context of the P-T history. Our study presents evidence for decoupling in zircon from the highest grade metapelites (> 850 °C) taken along a continuous high-temperature metamorphic field gradient in the Ivrea Zone (NW Italy). These rocks represent a well-characterised segment of Permian lower continental crust with a protracted high-temperature history. Cathodoluminescence images reveal that zircons in the mid-amphibolite facies preserve mainly detrital cores with narrow overgrowths. In the upper amphibolite and granulite facies, preserved detrital cores decrease and metamorphic zircon increases in quantity. Across all samples we document a sequence of four rim generations based on textures. U-Pb dates, Th/U ratios and Ti-in-zircon concentrations show an essentially continuous evolution with increasing metamorphic grade, except in the samples from the granulite facies, which display significant scatter in age and chemistry. We associate the observed decoupling of zircon systematics in high-grade non-metamict zircon with disturbance processes related to differences in behaviour of non-formula elements (i.e. Pb, Th, U, Ti) at high-temperature conditions, notably differences in compatibility within the crystal structure.

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“…The generation of large volumes of silicic magmas is commonly accompanied by basaltic magma underplating (Annen and Sparks, 2002;Annen et al, 2006), which provides heat and, potentially, materials for the generation of the felsic magmas. In a silicic large igneous province (SLIP), the fertility of crust plays a crucial role in governing the generation of large volumes of continental silicic magmas (Bryan, 2007;Bryan et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Overlapping Sr–Nd–Hf–O isotopic compositions in Permian mafic enclaves and host granitoids in Alxa Block, NW China: Evidence for crust–mantle interaction and implications for the generation of silicic igneous provinces

Wei

Wang

et al. 2015

Lithos

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Effects of repetitive emplacement of basaltic intrusions on thermal evolution and melt generation in the crust

Cited by 528 publications

References 58 publications

Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

Zircon ages in granulite facies rocks: decoupling from geochemistry above 850 °C?

Overlapping Sr–Nd–Hf–O isotopic compositions in Permian mafic enclaves and host granitoids in Alxa Block, NW China: Evidence for crust–mantle interaction and implications for the generation of silicic igneous provinces

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