Systematics of zircon crystallisation in the Cretaceous Separation Point Suite, New Zealand, using U/Pb isotopes, REE and Ti geothermometry

Bolhar, Robert; Weaver, S. D.; Palin, J. Michael; Cole, Jim; Paterson, Lorraine A.

doi:10.1007/s00410-007-0278-5

Cited by 61 publications

(26 citation statements)

References 78 publications

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“…This suggests co-crystallization of monazite throughout most of the crystallization history recorded by zircon Th/U (Fig. 8), as this ratio has shown to be sensitive to temperature variations (Bolhar et al 2008). Hence, the core-to-rim increase of Hf observed in most zircon grains ( Fig.…”

Section: Magma Mixing and Relationships With Other Accessory Phasesmentioning

confidence: 83%

Zircon texture and chemical composition as a guide to magmatic processes and mixing in a granitic environment and coeval volcanic system

Gagnevin

Daly

Kronz

2009

Contrib Mineral Petrol

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This study documents the chemical and textural responses of zircon in the Elba igneous complex, with particular reference to the 7-to 7.8-Ma-old Monte Capanne pluton in relation to its coeval volcanic counterpart (Capraia), using BSE imaging and quantitative electron microprobe analyses. The Monte Capanne pluton displays multiple field and geochemical evidence for magma mixing. The samples we have investigated (including monzogranitic, mafic enclave and dyke samples) display similar zircon textures and are associated with an extremely large range of trace and minor element (Hf, Y, HREE, Th, U) compositions, which contrast with relatively simple textures and zoning patterns in zircons from a Capraia dacite. We have used a relatively simple textural classification (patchy zoning, homogenous cores, oscillatory zoning and unzoned zircon) as the basis for discussing the chemical composition and chemical variation within zircons from the Monte Capanne pluton. Based on these data and other works in Lithos 78:101-118, 2004 , it is inferred that mixing between metaluminous and peraluminous melts occurred early in the evolution of the Monte Capanne magma chamber. In particular, mixing was responsible for the development of the patchy-zoning texture in the zircon cores, which was associated with reactions between other accessory phases (including monazite, apatite, allanite), which we infer to have significantly affected the Th distribution in zircon. Zircons from the MC pluton displaying ''homogeneous cores'' have chemical affinities with zircons in the coeval Capraia volcanic system, consistent with the participation of a Capraia-like mantle end-member during mixing. Further zircon growth in the MC pluton produced the oscillatory zoning texture, which records both long-term (crystal fractionation) and transient (recharge with both silicic and mafic magmas) events in a hybrid magma chamber. It is inferred that Hf and the Th/U ratio cannot be used alone to infer magmatic processes due to their dependency on temperature, nor are they a diagnostic feature of xenocrystic grains. This study shows that zircon chemistry coupled with detailed textural analysis can provide a powerful tool to elucidate the complex evolution of a magma system.

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Section: Magma Mixing and Relationships With Other Accessory Phasesmentioning

confidence: 83%

Zircon texture and chemical composition as a guide to magmatic processes and mixing in a granitic environment and coeval volcanic system

Gagnevin

Daly

Kronz

2009

Contrib Mineral Petrol

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“…The new la-icP-MS data reported here contribute to a growing database of U-Pb zircon ages from the plutonic rocks of eastern Fiordland (Kimbrough et al 1994;Muir et al 1998;Scott et al 2008;Bolhar et al 2008). Figure 5 illustrates that this area records a carboniferous dioritic and granitic magmatic phase followed by quiescence until the emplacement of Jurassic to Early cretaceous dioritic and granitic plutons of the Darran/Median Suite (including the Hunter intrusives and Fowler Pluton).…”

Section: Discussionmentioning

confidence: 99%

LA‐ICP‐MS U‐Pb zircon ages from Mesozoic plutonic rocks in eastern Fiordland, New Zealand

Scott¹,

Palin²

2008

New Zealand Journal of Geology and Geophysics

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“…Therefore, it is a reliable geothermometer and geochronometer even through extended periods of high-grade metamorphism and partial melting of the host rock (Lee et al, 1997). It is also a good recorder of oxygen fugacity (Ballard et al, 2002;Bolhar et al, 2008;Hanchar and van Westrenen, 2007;Liang et al, 2006;Wang et al, 2011aWang et al, , 2011b. Zircon crystallized from magmas with higher oxygen fugacity has higher Ce anomaly, such that the Ce(IV)/Ce(III) calculated from Ce anomaly is a sensitive and robust indicator of magmatic oxidation state (Ballard et al, 2002).…”

Section: Redox State Of Molybdenum Depositmentioning

confidence: 99%

The formation of the Dabaoshan porphyry molybdenum deposit induced by slab rollback

Zhang

Wang

et al. 2012

Lithos

182

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Systematics of zircon crystallisation in the Cretaceous Separation Point Suite, New Zealand, using U/Pb isotopes, REE and Ti geothermometry

Cited by 61 publications

References 78 publications

Zircon texture and chemical composition as a guide to magmatic processes and mixing in a granitic environment and coeval volcanic system

Zircon texture and chemical composition as a guide to magmatic processes and mixing in a granitic environment and coeval volcanic system

LA‐ICP‐MS U‐Pb zircon ages from Mesozoic plutonic rocks in eastern Fiordland, New Zealand

The formation of the Dabaoshan porphyry molybdenum deposit induced by slab rollback

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