Open AccessENVIRONMENT OF POTASSIUM-MAGNESIUM SALT FORMATION IN THE UPPERPERMIAN KALININGRAD-GDANSK BLOCK OF THE CENTRAL EUROPEAN HALOGEN BASIN (FROMEXAMINATIONOFINCLUSIONSINMINERALS)
Author(s) -
О. П. Гончаренко,
AUTHOR_ID,
I.L. Lashina,
AUTHOR_ID
Publication year - 2021
Language(s) - English
Resource type - Conference proceedings
DOI - 10.17072/chirvinsky.2021.25
Subject(s) - halite , geology , geochemistry , potassium , mineralogy , magnesium , evaporite , mineral , crystallization , gypsum , chemistry , sedimentary rock , paleontology , organic chemistry
Examination of inclusions in minerals makes the basis for analyzing the peculiarities of salt crystallizationin the Kaliningrad-Gdansk halogen block of the Central- European evaporite basin. Most of the studied sections are composed of fine – medium- grained rock made of halite impregnated with polyhalite, kieserite, carnallite and kainite. Threesystemsofmicro-inclusionsmaybedistinguishedamongthe wide diversity of inclusions: 1) inclusions of mineral-forming mediums; 2) inclusions of surrounding mediums; 3) solid inclusions captured by minerals during their growth from marine solutions. Thedead-endpositionofthestudybasinaccounts for the solutions enrichment in potassium and magnesium arriving from the neighboring German-Polish halogen- bearing areas. Theinflowingbrinewas desalinated by continental waters enriched in calcium and sulfate ions. Thisusedtoresultincreating conditions for polyhalite precipitation. Thepresenceofflatboat-shapedstructuresin halite and in kainite grains is most probably indicative of surficial crystallization of potassium and potassium-magnesium minerals. Carnalliteandbischofiteimpregnationsarerecordedinhalite, whichis indicative of theeutonicstagein the basin development and of manifestations of bottom crystallization of minerals and, accordingly, of the brine probable stratification. Therefore, at the moment of crystallization of potassium and potassium-magnesium minerals, the basin was peculiar foravailabilityoftwo-layeredbrine.