final stages

Carnallite-halite rocks are the elements of halogenesis’ final stage. Carnallite setting have to follow after sylvinite setting. At the real cut (Gremyachinskoye field also) such succession is disturbed and foundations of those formations proceed of potassium accumulation. Structure of those rocks reflects the receipt in basin with evaporated brine of slightly evaporated solution. NaCl and sometimes KCl are salting out and formed ground halite and rare sylvinite- carnallite rocks.

The paper deals with the role of the factors that determine the texturalstructural peculiarities of potassium, potassium-magnesium and magnesium salts in the Caspian halogenic basin. Special reference is made to the role of highly concentrated brine preservation in certain basin water areas, importance of constant inflow of low condensed brine, salting-out of sodium and potassium chlorides, basin bottom morphology, the influence of two types of sedimentation rhythmicity (halogenic and terrigenous) and secondary processes of mineral formation.