Zircon as Magma Monitor

Claiborne, Lily L.; Miller, Calvin F.; Gualda, Guillherme A. R.; Carley, Tamara L.; Covey, Aaron K.; Wooden, Joseph L.; Fleming, Marc A.

doi:10.1002/9781119227250.ch1

Cited by 24 publications

(6 citation statements)

References 80 publications

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“…Hoskin & Schaltegger, 2003;Luo & Ayers, 2009;Watson, 1996a), partitioning models derived from natural data have proven reasonable within a number of silicic systems (Claiborne et al, 2017;Sano et al, 2002). Using the coefficient of Sano et al (2002) or Claiborne et al (2017), the REE compositions of the rims and light-CL cores are consistent with the whole-rock compositions of the LdM rhyolites. In contrast, the melt compositions calculated for the interiors and dark-CL cores extend to concentrations one-to-two orders of magnitude higher ( Figures S5 and S6).…”

Section: Compositional Evolution and Structure Of The Ldm Magma Systemmentioning

confidence: 82%

“…The destabilization of hornblende and/or titanite during melting would produce overall elevated trace element contents with lower U/Th and Yb/Gd ratios and higher zircon Ti contents due to higher temperatures and Ti liberated from titanite, consistent with the trends in the high-U domains (Figures 3 and 4). Upartitioning by zircon decreases at higher temperature (Claiborne et al, 2017), and thus the U-Ti correlation at LdM reflects the evolving melt composition rather than a temperature dependence. High crystal growth rates may also enhance the uptake of trace elements by zircon through the formation of enriched melt boundary layers or the overgrowth of trace element-enriched surface domains (Bacon, 1989;Hofmann et al, 2009;Watson, 1996a) (2007), aTiO 2 of 0.72 and aSiO 2 of 1.…”

Section: Compositional Evolution and Structure Of The Ldm Magma Systemmentioning

confidence: 99%

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Repeated Rhyolite Eruption From Heterogeneous Hot Zones Embedded Within a Cool, Shallow Magma Reservoir

2019

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Despite the hazard posed by explosive silicic eruptions, the magma storage conditions and dynamics that precede these events remain controversial. The Laguna del Maule volcanic field, central Chile, is an exceptional example of postglacial (younger than ca. 20,000 years) rhyolite volcanism and sustained unrest driven by a large, shallow, active silicic magma system. New zircon petrochronologic data reveal that compositionally distinct domains developed concurrently within the Laguna del Maule magma reservoir, which produced two episodes of concentrated rhyolitic eruptions at 23–19 and 8–2 ka. Zircon crystallization ages record 160 kyr of magma emplacement resulting in a several hundreds of cubic kilometers reservoir that has been imaged geophysically. The average magma emplacement rate inferred from the zircon geochronology and tomographically defined magma volume is consistent with those required by thermal models to maintain a shallow silicic system. Ti‐in‐zircon temperatures of crystal cores and rims and hiatuses in crystal growth indicates most of this volume persisted in a near‐solidus state. However, consistent patterns of trace element zoning in crystal interiors and crystallization rates derived from a model of diffusion‐limited zircon growth suggest the erupted rhyolite magma batches originated from long‐lived hot zones of extractable mush embedded within the larger, cool reservoir of rigid mush. These contrasting, coeval magma storage conditions obviate a simple hot versus cold storage dichotomy for large silicic magma systems.

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Section: Compositional Evolution and Structure Of The Ldm Magma Systemmentioning

confidence: 82%

Section: Compositional Evolution and Structure Of The Ldm Magma Systemmentioning

confidence: 99%

Repeated Rhyolite Eruption From Heterogeneous Hot Zones Embedded Within a Cool, Shallow Magma Reservoir

2019

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“…Uncertainties in reported U-Pb zircon dates are at the 95% confidence level and exclude tracer calibration and decay constant uncertainties. Correction for initial 230 Th disequilibrium in the 206 Pb/ 238 U system was made on a fraction-by-fraction basis by estimating (Th/U) magma using (Th/U) zircon determined by TIMS and a mean (Th/U) zircon-magma partition coefficient ratio of 0.19 ± 0.11, which encompasses the range of values for (Th/U) zircon-magma partition coefficients obtained from glasses from a variety of volcanic settings (60). Uncertainties for the resulting (Th/U) magma were also calculated on a fraction-by-fraction basis, propagating the uncertainty in the (Th/U) zircon-magma partition coefficient.…”

Section: Zircon Separation and Preparationmentioning

confidence: 99%

Rapid eruption of the Columbia River flood basalt and correlation with the mid-Miocene climate optimum

2018

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“…The great majority of zircons in the detrital archive (>98%, Balica et al., 2020 ) are igneous and have Ti‐in‐zircon crystallization temperatures (Ferry & Watson, 2007 ) consistent with derivation from felsic melts. Zircon‐felsic melt partition coefficients determined experimentally (e.g., Burnham & Berry, 2012 ; Fujimaki, 1986 ; Watson, 1980 ) or empirically (e.g., Claiborne et al., 2018 ; J. B. Chapman et al., 2016 ) are used to calculate trace element concentrations of the host magma assuming zircon‐melt equilibrium.…”

Section: Mohometersmentioning

confidence: 99%

Chemical Mohometry: Assessing Crustal Thickness of Ancient Orogens Using Geochemical and Isotopic Data

Luffi

Ducea

2022

Reviews of Geophysics

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Convergent plate boundaries are key sites for continental crustal formation and recycling. Quantifying the evolution of crustal thickness and paleoelevation along ancient convergent margins represents a major goal in orogenic system analyses. Chemical and in some cases isotopic compositions of igneous rocks formed in modern supra‐subduction arcs and collisional belts are sensitive to Moho depths at the location of magmatism, implying that igneous suites from fossil orogens carry information about crustal thickness from the time they formed. Several whole‐rock chemical parameters correlate with crustal thickness, some of which were calibrated to serve as “mohometers,” that is, quantitative proxies of paleo‐Moho depths. Based on mineral‐melt partition coefficients, this concept has been extended to detrital zircons, such that combined chemical and geochronological information extracted from these minerals allows us to reconstruct the crustal thickness evolution using the detrital archive. We discuss here the mohometric potential of a variety of chemical and isotopic parameters and show that their combined usage improves paleocrustal thickness estimates. Using a MATLAB® app developed for the underlying computations, we present examples from the modern and the deeper time geologic record to illustrate the promises and pitfalls of the technique. Since arcs are in isostatic equilibrium, mohometers are useful in reconstructing orogenic paleoelevation as well. Our analysis suggests that many global‐scale correlations between magma composition and crustal thickness used in mohometry originate in the sub‐arc mantle; additional effects resulting from intracrustal igneous differentiation depend on the compatible or incompatible behavior of the involved parameters.

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Zircon as Magma Monitor

Cited by 24 publications

References 80 publications

Repeated Rhyolite Eruption From Heterogeneous Hot Zones Embedded Within a Cool, Shallow Magma Reservoir

Repeated Rhyolite Eruption From Heterogeneous Hot Zones Embedded Within a Cool, Shallow Magma Reservoir

Rapid eruption of the Columbia River flood basalt and correlation with the mid-Miocene climate optimum

Chemical Mohometry: Assessing Crustal Thickness of Ancient Orogens Using Geochemical and Isotopic Data

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