As a common hydrated magnesium-rich carbonate mineral, hydromagnesite
[Mg5(CO3)4(OH)2·4H2O] can be used as a high-quality mineral-type
flame-retardant filler in the field of polymer flame-retardant. Studies
have shown that hydromagnesite mainly occurs in carbonate-type saline
lakes and Quaternary lacustrine strata, and was also found in the
lacustrine deposits of Jezero Crater on Mars, and the Mg/Ca value of the
lake water is considered to be hydromagnesite. Key conditions for
mineralization. The traditional view is that the formation of lacustrine
hydromagnesite is mainly related to the weathering of ultrabasic rocks
to provide magnesium-rich source supply, but the Mg/Ca value of surface
river water and groundwater related to the weathering of ultrabasic
rocks rarely reaches enough Threshold for direct precipitation of
hydromagnesite in salt lakes (Fig. 1a). Therefore, finding out the
geochemical cycle process of Mg in the saline lake system is the key
link to understand the mineralization process of hydromagnesite.
In response to the above key scientific issues, relying on the Qinghai-Tibet Plateau Salt Lake Field Scientific Observation and Research Station of the Ministry of Natural Resources, the Institute of Mineral Resources of the China Geological Survey (hereinafter referred to as the “Resource Institute”) and its collaborators took the Dujiali Salt Lake in Tibet as an example to systematically carry out Mg isotopic studies of salt lake water, river water, groundwater, and hydromagnesite (Fig. 1c). In this work, using Mg isotope analysis combined with the hydrochemical simulation software Phreeqc, the semi-quantitative hydrochemical evolution model of the Mg/Ca value and δ26Mg changes in the Dujiali Salt Lake under evaporation conditions was established for the first time (Fig. geochemical cycles.
The results show that…
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