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Title: Zircon age-temperature-compositional spectra in plutonic rocks

Journal Article · · Geology
DOI:https://doi.org/10.1130/G38645.1· OSTI ID:1426134
 [1];  [2];  [2];  [1];  [1]
  1. Princeton Univ., NJ (United States). Department of Geosciences
  2. Univ. of California, Los Angeles, CA (United States). Department of Earth, Planetary and Space Sciences

We present that 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. In conclusion, 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.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1426134
Report Number(s):
LLNL-JRNL-747222; TRN: US1802226
Journal Information:
Geology, Vol. 45, Issue 11; ISSN 0091-7613
Publisher:
Geological Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (4)

Evidence of mingling between contrasting magmas in the Ribeirão do Óleo Pluton, Coastal Terrane and the tectonic implications on the Ribeira Belt, Brazil journal January 2020
238 U/ 235 U measurement in single-zircon crystals: implications for the Hadean environment, magmatic differentiation and geochronology journal January 2019
Extreme Zr stable isotope fractionation during magmatic fractional crystallization journal December 2019
U-Pb constraints on pulsed eruption of the Deccan Traps across the end-Cretaceous mass extinction journal February 2019