Abstract
Microgeochemical data and transmission electron microscope (TEM) imaging of S-rich monazite crystals demonstrate that S has been incorporated in the lattice of monazite as a clino-anhydrite component via the following exchange Ca2+ + S6+ = REE3+ + P5+, and that it is now partly exsolved in nanoclusters (5–10 nm) of CaSO4. The sample, an osumilite-bearing ultra-high-temperature granulite from Rogaland, Norway, is characterized by complexly patchy zoned monazite crystals. Three chemical domains are distinguished as (1) a sulphate-rich core (0.45–0.72 wt% SO2, Th incorporated as cheralite component), (2) secondary sulphate-bearing domains (SO2 >0.05 wt%, partly clouded with solid inclusions), and (3) late S-free, Y-rich domains (0.8–2.5 wt% Y2O3, Th accommodated as the huttonite component). These three domains yield distinct isotopic U–Pb ages of 1034 ± 6, 1005 ± 7, and 935 ± 7 Ma, respectively. Uranium–Th–Pb EPMA dating independently confirms these ages. This study illustrates that it is possible to discriminate different generations of monazite based on their S contents. From the petrological context, we propose that sulphate-rich monazite reflects high-temperature Fe–sulphide breakdown under oxidizing conditions, coeval with biotite dehydration melting. Monazite may therefore reveal the presence of S in anatectic melts from high-grade terrains at a specific point in time and date S mobilization from a reduced to an oxidized state. This property can be used to investigate the mineralization potential of a given geological event within a larger orogenic framework.
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Acknowledgments
We thank Ph. De Parseval and S. Gouy for their technical assistance with the microprobe and J.M. Montel for synthesizing the Pb-free (REE)PO4 crystals used in this study. This work was supported by the CNRS NEEDS program and a PHC Aurora grant (Ministry of Foreign Affairs, Norway and France). The access to the FIB facility was possible thanks to the French RENATECH network. Constructive reviews by D. Harlov, M. Williams and editorial handling by S. Reddy are greatly appreciated.
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Laurent, A.T., Seydoux-Guillaume, AM., Duchene, S. et al. Sulphate incorporation in monazite lattice and dating the cycle of sulphur in metamorphic belts. Contrib Mineral Petrol 171, 94 (2016). https://doi.org/10.1007/s00410-016-1301-5
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DOI: https://doi.org/10.1007/s00410-016-1301-5