Abstract
The compositional zoning of the major divalent cations in metamorphic garnet is a useful tool in reconstructing the pressure–temperature path. However, trace elements can provide a better-preserved record of petrogenetic evolution due to their strong affinity in garnet and slow diffusion rates. In this study, three high-pressure micaschist samples of varying composition and garnet textures from the Krušné hory Mountains (Saxothuringian zone, Bohemian Massif) were examined. By utilizing electron probe micro-analysis and laser ablation inductively coupled plasma mass spectrometry, three distinct types of compositional zoning in garnet were identified by compositional map**. The zoning types were classified as continuous core-to-rim change, concentric annular changes, and overprinting of a pre-existing distribution; all three provide information on the original mineral composition and texture before garnet overgrowth. The transition from overprint to annular zoning shows relation to temperature increment. The annular zoning allowed the identification of several coupled substitutions, including alkali (sodium and lithium) + yttrium and the alkali + phosphorus substitution which is typical of high- to ultra-high-pressure conditions. The formation of annuli zoning was interpreted to originate not only from the decomposition of trace element bearing phases, but also to be related to the availability of fluid medium during garnet growth. Two samples contained atoll texture garnets, interpreted to be originated from the dissolution of the garnet central part, chemically distinct from the new garnet growing coevally on the rim or replacing the original central part. This proposed process is evidenced by the mass balance calculation of yttrium and heavy rare earth elements between the dissolved garnet and newly formed parts.
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Acknowledgements
We extend our gratitude to the reviewers, D. R. Viete and an anonymous reviewer, for their valuable feedback, and to D. Rubatto for the meticulous editorial handling. Their constructive reviews have greatly contributed to the enhancement of this paper. This work was supported by the Czech Science Foundation (Grant No. 18-03160S), Grant Agency of Charles University (Grant No. 1194019), and by Charles University through the Cooperatio Program (Research Area GEOL) and Center for Geosphere Dynamics (UNCE/SCI/006). The authors wish to thank Geowriters for proofreading and language editing. We would like to express our sincere appreciation to M. Svojtka and J. Ďurišová for their assistance with LA-ICP-MS measuremen-ts, as well as to R. Jedlička for his contributions to EPMA measurements. Special thanks to O. Lexa for his assistance in data processing using Python, and to M. Racek for providing valuable insights in the field of trace element behavior.
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Kulhánek, J., Faryad, S.W. Compositional changes in garnet: trace element transfer during eclogite-facies metamorphism. Contrib Mineral Petrol 178, 68 (2023). https://doi.org/10.1007/s00410-023-02050-8
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DOI: https://doi.org/10.1007/s00410-023-02050-8