Zircon age-temperature-compositional spectra in plutonic rocks

Kyle M. Samperton, Elizabeth A. Bell, Melanie Barboni, C. Brenhin Keller, Blair Schoene

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Geochronology can resolve dispersed zircon dates in plutonic rocks when magma cooling time scales exceed the temporal precision of individual U-Pb analyses; such age heterogeneity may indicate protracted crystallization between the temperatures of zircon saturation (Tsat) and rock solidification (Tsolid). Diffusive growth models predict asymmetric distributions of zircon dates and crystallization temperatures in a cooling magma, with volumetrically abundant old, hot crystallization at Tsat decreasing continuously to volumetrically minor young, cold crystallization at Tsolid. We present integrated geochronological and geochemical data from Bergell Intrusion tonalites (Central Alps, Europe) that document zircon compositional change over hundreds of thousands of years at the hand-sample scale, indicating melt compositional evolution during solidification. Ti-in-zircon thermometry, crystallization simulation using MELTS software, and U-Pb dates produce zircon mass-temperature-time distributions that are in excellent agreement with zircon growth models. These findings provide the first quantitative validation of longstanding expectations from zircon saturation theory by direct geochronological investigation, underscoring zircon's capacity to quantify supersolidus cooling rates in magmas and resolve dynamic differentiation histories in the plutonic rock record.

Original languageEnglish (US)
Pages (from-to)983-986
Number of pages4
JournalGeology
Volume45
Issue number11
DOIs
StatePublished - Nov 1 2017
Externally publishedYes

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plutonic rock
zircon
crystallization
temperature
solidification
saturation
cooling
magma
geochronology
rock
melt
timescale
software

ASJC Scopus subject areas

  • Geology

Cite this

Samperton, K. M., Bell, E. A., Barboni, M., Brenhin Keller, C., & Schoene, B. (2017). Zircon age-temperature-compositional spectra in plutonic rocks. Geology, 45(11), 983-986. https://doi.org/10.1130/G38645.1

Zircon age-temperature-compositional spectra in plutonic rocks. / Samperton, Kyle M.; Bell, Elizabeth A.; Barboni, Melanie; Brenhin Keller, C.; Schoene, Blair.

In: Geology, Vol. 45, No. 11, 01.11.2017, p. 983-986.

Research output: Contribution to journalArticle

Samperton, KM, Bell, EA, Barboni, M, Brenhin Keller, C & Schoene, B 2017, 'Zircon age-temperature-compositional spectra in plutonic rocks', Geology, vol. 45, no. 11, pp. 983-986. https://doi.org/10.1130/G38645.1
Samperton KM, Bell EA, Barboni M, Brenhin Keller C, Schoene B. Zircon age-temperature-compositional spectra in plutonic rocks. Geology. 2017 Nov 1;45(11):983-986. https://doi.org/10.1130/G38645.1
Samperton, Kyle M. ; Bell, Elizabeth A. ; Barboni, Melanie ; Brenhin Keller, C. ; Schoene, Blair. / Zircon age-temperature-compositional spectra in plutonic rocks. In: Geology. 2017 ; Vol. 45, No. 11. pp. 983-986.
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