2018
DOI: 10.1007/s00410-018-1527-5
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Metasomatism and the crystallization of zircon megacrysts in Archaean peridotites from the Lewisian complex, NW Scotland

Abstract: Zircon megacrysts are locally abundant in 1–40 cm-thick orthopyroxenite veins within peridotite host rocks in the Archaean Lewisian gneiss complex from NW Scotland. The veins formed by metasomatic interaction between the ultramafic host and Si-rich melts are derived from partial melting of the adjacent granulite-facies orthogneisses. The interaction produced abundant orthopyroxene and, within the thicker veins, phlogopite, pargasite and feldspathic bearing assemblages. Two generations of zircon are present wit… Show more

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Cited by 10 publications
(6 citation statements)
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References 93 publications
(154 reference statements)
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“…While supercritical fluids may be initial agents for leaching elements from the slab, they are likely to separate into immiscible hydrous melts and aqueous fluids at the slab‐mantle interface in response to changes in pressure, temperature, and especially bulk rock compositions (Chen et al., 2018; Manning, 2004). As the process continues, hydrous melts will react with mantle peridotites to form metasomatic domains containing zircon (e.g., Faithfull et al., 2018; Kalfoun et al., 2002; Li et al., 2016; Malaspina et al., 2006), whereas aqueous fluids may ascend to the arc magma source regions (Malaspina et al., 2006). In this case, zirconium mobilization is controlled not only by zircon solubility in supercritical fluids but also by partitioning of Zr between hydrous melts and aqueous fluids.…”
Section: Discussionmentioning
confidence: 99%
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“…While supercritical fluids may be initial agents for leaching elements from the slab, they are likely to separate into immiscible hydrous melts and aqueous fluids at the slab‐mantle interface in response to changes in pressure, temperature, and especially bulk rock compositions (Chen et al., 2018; Manning, 2004). As the process continues, hydrous melts will react with mantle peridotites to form metasomatic domains containing zircon (e.g., Faithfull et al., 2018; Kalfoun et al., 2002; Li et al., 2016; Malaspina et al., 2006), whereas aqueous fluids may ascend to the arc magma source regions (Malaspina et al., 2006). In this case, zirconium mobilization is controlled not only by zircon solubility in supercritical fluids but also by partitioning of Zr between hydrous melts and aqueous fluids.…”
Section: Discussionmentioning
confidence: 99%
“…Zirconium could be efficiently extracted from subducted crust rocks by solute‐rich supercritical fluids, as evidenced by newly formed zircon in orogenic peridotites at slab‐mantle interface (Faithfull et al., 2018; Li et al., 2016). However, the question arises as to whether or not zirconium can be transferred to the source of arc magma or to the volcanic arc.…”
Section: Discussionmentioning
confidence: 99%
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“…Metaperidotite is variably veined by separate carbonate-and orthopyroxene-rich veins, with the latter more numerous than the former (Faithfull et al, 2018). The orthopyroxene-dominated veins, which display sharp contacts with the surrounding ultramafic rocks, are 1-40 cm thick and contain centimetre-scale zircon crystals interpreted as associated with Inverian metasomatism (Faithfull et al, 2018). Adjacent metagabbrodominated mafic rocks, which occur in association with intermediate gneiss, are poorly-exposed and locally contain coarse garnet.…”
Section: Field Relationshipsmentioning
confidence: 99%