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• W2107330618 abstract "Understanding the geochemical characteristics of metamorphic zircon, and how they may be modified by recrystallization processes, is fundamental to defining the timescales of tectonic processes affecting continental lithosphere. We utilize laser ablation split-stream (LASS)-ICP-MS depth-profiling analysis to obtain a continuous rim-to-core record of the U–Pb ages and trace-element composition preserved within variably recrystallized zircon from different rock types within a well-studied granulite domain in the western Grenville Province, Canada. Detailed analysis of the depth-resolved signal enables definition of chemically distinct (homogeneous) internal domains and heterogeneous intervening zones that can generally be correlated with textural features observed in CL. Three age populations have been distinguished within the ~ 35 μm deep profiles that correlate well with the established timing of protolith formation, granulite-facies metamorphism, and amphibolite-facies shearing, respectively. The U–Pb isotopic system and Th/U ratios in much of the crystal interiors have undergone considerable modification, as evidenced by a linear correlation between 207Pb/206Pb age and Th/U ratio. Interior and rim domains commonly contain blurred or faded oscillatory zoning patterns, suggesting that solid-state recrystallization is at least partially responsible for the modified U–Th–Pb composition. A number of systematic trends in trace element composition are also observed between interior domains and recrystallized rims, including 1) decreased Th/U (to ~ 0.1), 2) tighter clustering of Hf concentrations, 3) decreased total REE, 4) unchanged Eu anomalies, and 5) a widened spread of HREE enrichment values (YbN/GdN). Both YbN/GdN vs. Th/U and U/Ce vs. Th plots show increasing degree of compositional differentiation from protolith zircon as a function of metamorphic reworking processes (i.e. sample type). The transition zones between interior and rim domains exhibit textural features consistent with solid-state recrystallization and migration of a transgressive recrystallization front. The main compositional characteristics of the transition zones are 1) spikes in U and Ta, 2) steady to abrupt increases in Hf toward maximum values in the rims, 3) steady to abrupt decreases in Th toward minimum values in the rims, and 4) variable REE patterns that include spikes, troughs, and montonic decreases. Most of these characteristics are consistent with the purging of larger ions from the crystal lattice during recrystallization, with local bands of high concentration associated with recrystallization fronts." @default.
• W2107330618 created "2016-06-24" @default.
• W2107330618 creator A5018255149 @default.
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• W2107330618 date "2015-12-01" @default.
• W2107330618 modified "2023-10-10" @default.
• W2107330618 title "Zircon U–Pb and trace element zoning characteristics in an anatectic granulite domain: Insights from LASS-ICP-MS depth profiling" @default.
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• W2107330618 doi "https://doi.org/10.1016/j.lithos.2015.10.017" @default.
• W2107330618 hasPublicationYear "2015" @default.
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