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Chemical weathering in Antarctica: an example of igneous rock particles in Big Lachman Lake sediments, James Ross Island

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Abstract

Lacustrine sediments of the Big Lachman Lake (James Ross Island, Antarctica) are dominated by clay- and silt-sized particles of varied petrographic composition. These are of volcanic origin and are derived predominantly from the Mendel Formation. The intensity of chemical weathering of volcanic rock particles in the sediments was expressed by the Chemical Index of Alteration (CIA), which reflects alteration of feldspars and formation of clay minerals. The observed mineral assemblage of montmorillonite, illite, and kaolinite probably originated from alteration of volcanic glass and from alteration of feldspars to clay minerals. CIA weathering rates from the lacustrine sediments are similar to those of Early Jurrasic high-Ti volcanic rocks of the Mount Poster Formation and Middle Jurrasic high-Ti volcanic rocks of the Mapple Formation from the Antarctic Peninsula. However, the sediments show a good fit in OIB-normalized incompatible trace-element patterns only with the high-Ti volcanic rocks from the Middle Jurassic rhyolites of the Mapple Formation, while the fit with Cenozoic basalts of the James Ross Island Volcanic Group is poorer. Rocks from the Antarctic Peninsula were probably transported through the Prince Gustav channel by small glaciers during the Neogene and Quaternary.

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Acknowledgements

This research was financially supported by the institutional project RVO 67985831 of the Institute of Geology of the Czech Academy of Sciences, as well as by the BUT project LO1408 “AdMaS UP – Advanced Materials, Structures and Technologies”, supported by the Ministry of Education, Youth and Sports CR under the “National Sustainability Programme I” and the project MZE-RO1719. This contribution was supported by the Ministry of Education, Youth and Sports of the Czech Republic projects no. LM2015078 and CZ.02.1.01/0.0/0.0/16_013/0001708, which finance the scientific infrastructure of the Czech Antarctic J. G. Mendel Station. The authors appreciate the support of its crew. The authors also thank Simona Krmíčková (Masaryk University) and Martin J. Timmerman (Universität Potsdam) for the final corrections.

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Correspondence to Lukáš Krmíček.

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Vašinka, M., Krmíček, L., Všianský, D. et al. Chemical weathering in Antarctica: an example of igneous rock particles in Big Lachman Lake sediments, James Ross Island. Environ Earth Sci 79, 186 (2020). https://doi.org/10.1007/s12665-020-08926-3

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  • DOI: https://doi.org/10.1007/s12665-020-08926-3

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