Several salts like NaCl (halite), CaSO4(anhydrite), CaCO3 (calcite), CaMg(CO3)2 (dolomite), KCl (sylvite), MgCl2 (Chloromagnesite), et cetera, are found in salt formations in the subsurface. I want to show the primary igneous origin of these salt giants.
In a melt, these salts form an ionic liquid. The more different salts (or other chemicals) are dissolved, the lower the melting temperature becomes. A modern analogy of such low temperature ~500 degrees Celsius magmas can be found at the Ol Doinyo Lengai volcano, within the Great Rift Valley.
Are these salts mixable in an eutectic? Crystallization processes from ionic liquids are complex. What experimental research is available?
Hello,
I'm sorry, but I'll be skeptical. Formation of deposits of evaporites, ie salts such as NaCl, KCl, gypsum, etc. it is almost always interpreted sedimentary, ie by evaporation of sea water, and there is unquestionable evidence for this, for example paleontological. I can almost see on one such Neogene gypsum deposit from the window. For carbonates, it is more complicated because in addition to sedimentary carbonates, there are carbonatites that have a truly magmatic origin.
If, in theory, there is an extreme excess of salts (NaCl, CaSO4) in the magma, this will necessarily be reflected in the phase composition. These salts will inevitably react with the silicate melt to form a number of minerals of a specific composition. Magmatite will then be foidal or melilitic.
There is a growing group of researchers who doubt the evaporation story. There is simply no reasonable justification for dehydration leading to a million cubic kilometres of salt.
I therefore hope that there are material scientists with a better view. I look forward to their reactions. It is a pity that geologists are so conservative about this. Besides, this research will only provide additional evidence. I have already proven the igneous origin of salt deposits in various publications.
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- Chemistry
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