Zircon growth and recycling during the assembly of large, composite arc plutons

Miller, Jonathan S.; Matzel, J.; Miller, Calvin F.; Burgess, Seth D.; Miller, Robert B.

doi:10.1016/j.jvolgeores.2007.04.019

Cited by 575 publications

(314 citation statements)

References 76 publications

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“…The suspected volcanic sources, the Choiyoi and Puesto Viejo igneous suites, are known to have large populations of recycled zircon (Spalletti et al 2008;Domeier et al 2011;Ottone et al 2014). We therefore interpret this range to represent mixing of the zircon age population based on (1) high MSWD (1.6-17) of the weighted mean for Permian/Permo-Triassic zircon populations (Miller et al 2007;Compston and Gallagher 2012); (2) lack of inherited cores interpreted from catholuminescence images; (3) the reproducibility of ages between several grains (s ≥ 3); (4) concordance of the analyses; and (5) known history of the volcanic system. In order to avoid introducing bias toward inherited/recycled zircon age populations, maximum depositional ages are calculated from the weighted mean of the youngest, concordant zircon population (P 1 ) of three or more analyses as identified by kernel density plots to minimize the risk of producing an age affected by Pb-loss (Dickinson and Gehrels 2008) (Appendix B).…”

Section: U-pb Results and Interpretationmentioning

confidence: 95%

“…In many samples, zircon produced a dispersed range of ages (>20 Ma). While this age range could be due to mixing of different age domains within individual zircon grains during analysis, analytical uncertainty, or Pb-loss (Castiñeiras et al 2010), magma system evolution is complex and commonly recycles older zircon into later eruption/emplacement events and some individual plutons have been resolved to be emplaced over a period of >10 Ma (Coleman et al 2004;Miller et al 2007;Schwartz et al 2014). The suspected volcanic sources, the Choiyoi and Puesto Viejo igneous suites, are known to have large populations of recycled zircon (Spalletti et al 2008;Domeier et al 2011;Ottone et al 2014).…”

Section: U-pb Results and Interpretationmentioning

confidence: 99%

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U-PB zircon tuff geochronology from the Karoo Basin, South Africa: implications of zircon recycling on stratigraphic age controls

McKay

Weislogel

Fildani³

et al. 2015

International Geology Review

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Along the >650 km long southern margin of the Karoo Basin in South Africa, we traversed four evenly spaced stratigraphic transects and collected 22 samples of volcanic, air-fall tuffs thought to be distal deposits derived from the Permian-Triassic Southern Gondwanan volcanic arc. We present 469 new U-Pb zircon ages determined by sensitive high-resolution ion microprobe reverse geometry (SHRIMP-RG) at the Stanford-USGS Microanalytical Center in order to constrain the maximum depositional ages for the southern Karoo Basin strata. Weighted means of these youngest coherent zircon populations were selected to maximize the number of analyses while minimizing the mean square weighted deviation (MSWD) to increase the robustness and decrease the influence of Pb-loss and inheritance in determining the maximum depositional age. Maximum depositional ages for the marine Ecca Group range from 250 to 274 Ma, whereas in the conformably overlying terrestrial Beaufort Group maximum depositional ages ranged from 257 to 452 Ma. Across the southern Karoo Basin, the Ecca Group tuffs produce maximum depositional ages that young upward; however, the Beaufort Group tuffs yield maximum depositional ages that are geochronologically out of sequence. Furthermore, maximum depositional ages of the Beaufort Group tuffs are consistently older than ash ages within the underlying marine strata. Our results are supported by previously published U-Pb tuff zircon geochronology in the Karoo Basin and demonstrate that the presence of out-of-sequence, older tuff ages are repeatable in Beaufort Group tuffs along the southern margin of the basin. We propose that tuffs in the Karoo Basin are correlative with tuffs in southern South America, and that the age spectra of these tuffs were influenced by magmatic crustal recycling. We use these data to highlight the complexity of U-Pb zircon datasets from tuffs, address the use of U-Pb zircon ages to provide absolute age controls, and discuss the implications of these new age controls on the Permian-Triassic Karoo strata.

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Section: U-pb Results and Interpretationmentioning

confidence: 95%

Section: U-pb Results and Interpretationmentioning

confidence: 99%

U-PB zircon tuff geochronology from the Karoo Basin, South Africa: implications of zircon recycling on stratigraphic age controls

McKay

Weislogel

Fildani³

et al. 2015

International Geology Review

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“…6f Interpretation and discussion of U-Pb ages and Hf isotope data All the dated samples provide evidence for protracted or poly episodic zircon growth over time spans of a few 10 5 years, which can be resolved thanks to increased analytical precision in the 206 Pb/ 238 U dates. Since zircon may already start to grow during magma assembly at deeper crustal levels and continue during ascent and emplacement into the middle to upper crust (Miller et al 2007), it is reasonable to assume that the youngest zircon date approximates the age of emplacement ). However, we cannot completely rule out the effect of lead loss, despite the pre-treatment by chemical abrasion.…”

Section: Zˇeljin Intrusive (Sample 21 Fig 6c)mentioning

confidence: 99%

Cenozoic granitoids in the Dinarides of southern Serbia: age of intrusion, isotope geochemistry, exhumation history and significance for the geodynamic evolution of the Balkan Peninsula

Schefer¹,

Cvetković

Fügenschuh

et al. 2010

Int J Earth Sci (Geol Rundsch)

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Two age groups were determined for the Cenozoic granitoids in the Dinarides of southern Serbia by high-precision single grain U-Pb dating of thermally annealed and chemically abraded zircons: (1) Oligocene ages (Kopaonik, Drenje, Ž eljin) ranging from 31.7 to 30.6 Ma (2) Miocene ages (Golija and Polumir) at 20. 58-20.17 and 18.06-17.74 Ma, respectively. Apatite fission-track central ages, modelling combined with zircon central ages and additionally, local structural observations constrain the subsequent exhumation history of the magmatic rocks. They indicate rapid cooling from above 300°C to ca. 80°C between 16 and 10 Ma for both age groups, induced by extensional exhumation of the plutons located in the footwall of core complexes. Hence, Miocene magmatism and core-complex formation not only affected the Pannonian basin but also a part of the mountainous areas of the internal Dinarides. Based on an extensive set of existing age data combined with our own analyses, we propose a geodynamical model for the Balkan Peninsula: The Late Eocene to Oligocene magmatism, which affects the Adriaderived lower plate units of the internal Dinarides, was caused by delamination of the Adriatic mantle from the overlying crust, associated with post-collisional convergence that propagated outward into the external Dinarides. Miocene magmatism, on the other hand, is associated with core-complex formation along the southern margin of the Pannonian basin, probably associated with the W-directed subduction of the European lithosphere beneath the Carpathians and interfering with ongoing Dinaridic-Hellenic back-arc extension.

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“…Lowenstern et al 2000;Wang et al 2002;Miller and Wooden 2004;Kemp et al 2007;Lowery Claiborne et al 2006;Yang et al 2007;Miller et al 2007). Zircon is an extremely robust mineral that can crystallize over a wide range of magmatic temperatures, essentially depending on the bulk composition of the host magma (and associated source rock; Watson and Harrison 1983;Harrison and Watson 1983).…”

Section: Introductionmentioning

confidence: 99%

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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Zircon growth and recycling during the assembly of large, composite arc plutons

Cited by 575 publications

References 76 publications

U-PB zircon tuff geochronology from the Karoo Basin, South Africa: implications of zircon recycling on stratigraphic age controls

U-PB zircon tuff geochronology from the Karoo Basin, South Africa: implications of zircon recycling on stratigraphic age controls

Cenozoic granitoids in the Dinarides of southern Serbia: age of intrusion, isotope geochemistry, exhumation history and significance for the geodynamic evolution of the Balkan Peninsula

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

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