Wavelet-based correlation (WBC) of zoned crystal populations and magma mixing

Wallace, Glen; Bergantz, George W.

doi:10.1016/s0012-821x(02)00762-8

Cited by 90 publications

(27 citation statements)

References 44 publications

(31 reference statements)

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“…In the absence of magmatic zonation developed in the major axis (c-axis), the width of magmatic zonal area along the minor axis is represented as number in parentheses. and Fowler, 1996), such as crystal settling in a magma chamber (e.g., Igarashi et al, 2007), large-scale convection in a magma chamber (e.g., Singer et al, 1995), or magma mixing and reservoir replenishment (e.g., Edwards and Russell, 1996;Wallace and Bergantz, 2002;Renjith, 2014). Fowler et al (2002) suggest that the OZ formation arose from an intrinsic crystal growth mechanism rather than any extrinsic or bulk system-scale fluctuations.…”

Section: *4mentioning

confidence: 99%

Zircon growth in a granitic pluton with specific mechanisms, crystallization temperatures and U–Pb ages: Implication to the ‘spatiotemporal’ formation process of the Toki granite, central Japan

Yuguchi

Iwano²,

Kato

et al. 2016

Journal of Mineralogical and Petrological Sciences

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Zircons collected from a granitic pluton provide evidence of serial growth events with specific mechanisms, crystallization temperatures and U-Pb ages, revealing details of the sequential formation process from intrusion through emplacement to crystallization/solidification. The events have been identified by: 1) the study of the internal structure of zircon using cathodoluminescence, 2) deriving crystallization temperatures using Ti-inzircon thermometry of the internal structure and 3) U-Pb age dating of the internal structure. The magmatic zircons from the Toki granite, central Japan, show two kinds in their internal structure: a low luminescence core (LLC) and oscillatory zonation (OZ). The LLC was produced by interfacial reaction-controlled growth in the granitic magma with cooling from about 910 to 760°C. The formation of OZ occurred by diffusion-controlled growth in a cooling magma chamber from about 850 to 690°C. The U-Pb ages derived from the LLC ranges from 74.7 ± 4.2 to 70.5 ± 1.3 Ma, indicating the incipient intrusion timing of the magma into the shallow crust. The OZ ages distribute from 72.7 ± 0.6 to 70.4 ± 1.7 Ma, which mean the timing from emplacement to crystallization/solidification of the granite pluton. Thus, the serial processes from intrusion through emplacement to crystallization/solidification occurred within a few million years. The old LLC and OZ ages are recognized in the western margins of the Toki granite, implying that the magma forming the western margins was the first to intrude, emplace and crystallize/solidify. The western margins with initial intrusion may accompany the crustal assimilation in order to create sufficient magma reservoir space, which is consistent with larger SrI and ASI values found in the western margins of the granite.

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Section: *4mentioning

confidence: 99%

Zircon growth in a granitic pluton with specific mechanisms, crystallization temperatures and U–Pb ages: Implication to the ‘spatiotemporal’ formation process of the Toki granite, central Japan

Yuguchi

Iwano²,

Kato

et al. 2016

Journal of Mineralogical and Petrological Sciences

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“…Zonation in many minerals has been cited previously as evidence for complex histories (fractionation and recharge, reheating, mixing), and zircon has been used to record multi-stage magmatic histories (e.g., Davidson and Tepley, 1997;Wallace and Bergantz, 2002;Vazquez and Reid, 2002;Cooper and Reid 2003;Vazquez and Reid, 2004). The advent of the Ti-in-zircon thermometer (Watson and Harrison, 2005) and the simplicity of using Hf content to track fractionation, however, promise a refined, common, and quantifiable record of such histories.…”

Section: Elemental Zoning In Zircons From the Spirit Mountain Batholithmentioning

confidence: 99%

Tracking magmatic processes through Zr/Hf ratios in rocks and Hf and Ti zoning in zircons: An example from the Spirit Mountain batholith, Nevada

et al. 2006

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Zirconium and Hf are nearly identical geochemically, and therefore most of the crust maintains near-chondritic Zr/Hf ratios of ∼35–40. By contrast, many high-silica rhyolites and granites have anomalously low Zr/Hf (15–30). As zircon is the primary reservoir for both Zr and Hf and preferentially incorporates Zr, crystallization of zircon controls Zr/Hf, imprinting low Zr/Hf on coexisting melt. Thus, low Zr/Hf is a unique fingerprint of effective magmatic fractionation in the crust. Age and compositional zonation in zircons themselves provide a record of the thermal and compositional histories of magmatic systems. High Hf (low Zr/Hf) in zircon zones demonstrates growth from fractionated melt, and Ti provides an estimate of temperature of crystallization (TTiZ) (Watson and Harrison, 2005). Whole-rock Zr/Hf and zircon zonation in the Spirit Mountain batholith, Nevada, document repeated fractionation and thermal fluctuations. Ratios of Zr/Hf are ∼307–40 for cumulates and 18–30 for high-SiO2 granites. In zircons, Hf (and U) are inversely correlated with Ti, and concentrations indicate large fluctuations in melt composition and TTiZ (>100°C) for individual zircons. Such variations are consistent with field relations and ion-probe zircon geochronology that indicate a >1 million year history of repeated replenishment, fractionation, and extraction of melt from crystal mush to form the low Zr/Hf high-SiO2 zone.

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“…Thus, understanding the processes that govern crystal nucleation and growth, as well as crystal morphology, structure, and composition, are key to unlocking volcanic hazards and many other compelling questions. Small scale variations in crystal chemistry have become apparent in the last few decades through advances in microanalytical techniques (Anderson, 1983;Wallace and Bergantz, 2002;Davidson et al, 2007;Jerram and Martin, 2008, and references therein). At present, the most advanced instruments provide submicroscopic resolution (down to nanometer scale) of crystal chemistry and crystal structure (Zellmer et al, 2015(Zellmer et al, , 2016.…”

Section: Introductionmentioning

confidence: 99%

Inferring the Effects of Compositional Boundary Layers on Crystal Nucleation, Growth Textures, and Mineral Chemistry in Natural Volcanic Tephras through Submicron-Resolution Imaging

et al. 2016

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Crystal nucleation and growth are first order processes captured in volcanic rocks and record important information about the rates of magmatic processes and chemical evolution of magmas during their ascent and eruption. We have studied glass-rich andesitic tephras from the Central Plateau of the Southern Taupo Volcanic Zone by electron-and ion-microbeam imaging techniques to investigate down to sub-micrometer scale the potential effects of compositional boundary layers (CBLs) of melt around crystals on the nucleation and growth of mineral phases and the chemistry of crystal growth zones. We find that CBLs may influence the types of mineral phases nucleating and growing, and growth textures such as the development of swallowtails. The chemistry of the CBLs also has the capacity to trigger intermittent overgrowths of nanometer-scale bands of different phases in rapidly growing crystals, resulting in what we refer to as cryptic phase zoning. The existence of cryptic phase zoning has implications for the interpretation of microprobe compositional data, and the resulting inferences made on the conditions of magmatic evolution. Identification of cryptic phase zoning may improve thermobarometric estimates and thus geospeedometric constraints. In future, a more quantitative characterization of CBL formation and its effects on crystal nucleation and growth may contribute to a better understanding of melt rheology and magma ascent processes at the onset of explosive volcanic eruptions, and will likely be of benefit to hazard mitigation efforts.

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Wavelet-based correlation (WBC) of zoned crystal populations and magma mixing

Cited by 90 publications

References 44 publications

Zircon growth in a granitic pluton with specific mechanisms, crystallization temperatures and U–Pb ages: Implication to the ‘spatiotemporal’ formation process of the Toki granite, central Japan

Zircon growth in a granitic pluton with specific mechanisms, crystallization temperatures and U–Pb ages: Implication to the ‘spatiotemporal’ formation process of the Toki granite, central Japan

Tracking magmatic processes through Zr/Hf ratios in rocks and Hf and Ti zoning in zircons: An example from the Spirit Mountain batholith, Nevada

Inferring the Effects of Compositional Boundary Layers on Crystal Nucleation, Growth Textures, and Mineral Chemistry in Natural Volcanic Tephras through Submicron-Resolution Imaging

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