Abstract
The growth rates of alkali feldspar and quartz were measured in a felsic melt to better understand the differences in textures seen in different types of rocks forming from melts of similar composition (e.g., rhyolites, granites and granitic pegmatites). We discuss the effects of undercooling (deviation from equilibrium) on the transition between different types of feldspar-quartz intergrowths and the effects of the physicochemical conditions on the growth rates of quartz and feldspar. These rates were measured in experimental run products on a hydrous (~ 4 wt. % water), metaluminous granitic composition from experiments conducted in a piston cylinder apparatus at 600 MPa and temperatures from 500 to 800 °C. We also quantified the textural evolution of quartz and feldspar and their intergrowths in these experiments using fractal analysis.
The growth rate measurements were compared against previously published growth rates of quartz and feldspar from experiments on felsic melts, some of which contained B and Li. The results of fractal analysis of the experimental samples are compared to previously published measurements of natural graphic granite (Baker et al. in Can Mineral 56:625–643, 2018). We demonstrate the implications of the results of this study and possible applications to granites and granitic pegmatites. We show how the differences in growth rates can influence the formation of porphyritic granite and the sequential crystallization in zoned granitic pegmatites. We also suggest the possibility of using fractal analysis of quartz and feldspar and their intergrowths as an indicator of the deviation from equilibrium because the degree of undercooling appears correlated with the parameters measured using fractal analysis.
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Acknowledgements
We thank Tom Shea, Laura Waters, Bruce Watson and an anonymous reviewer for their comments which helped improve our work and Gordon Moore for the editorial handling of the manuscript. We would like to extend our gratitude to Lang Shi for the help with the EPMA and SEM-EDS analyses of the experimental samples. We also thank Maude Bilodeau for the help with the experiments. This study was funded by the National Sciences and Engineering Council (NSERC) of Canada Discovery Grant awarded to D.R.B.
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Rusiecka, M.K., Baker, D.R. Growth and textural evolution during crystallization of quartz and feldspar in hydrous, rhyolitic melt. Contrib Mineral Petrol 176, 48 (2021). https://doi.org/10.1007/s00410-021-01809-1
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DOI: https://doi.org/10.1007/s00410-021-01809-1