Glaukonit z osadów górnej kredy niecki śródsudeckiej

Abstract

GLAUCONITE FROM THE UPPER CRETACEOUS DEPOSITS OF THE INNER SUDETIC DEPRESSION Summary Here are presented preliminary reports of investigations on glauconite from the Upper Cretaceous deposits of the Inner- Sudetic depression. Studied glauconite come from gaizes and petitic limestones of the Upper Cenomanian age from the Krzeszów depression and from siltstones of Inoceramus labiatus horizon as well as from siliceous marls of Inoceramus lamarcki, occurred in the Batorów - depression. Microscopic, RTG, chemical and microsound analyses were done. Dominant glauconite form from both areas are oval aggregates (pelloids), composed of very fine flackes. Typical glauconite forms from the Batorów depression are oval aggregates, containing fine quartz detritical grains or voids of pre-pelletal detrical inclusion type as well as fine grains of ore minerals, mainly pyrite, in shape of synpelloidal inclusions. Some other oval grains with brown fringes were also found there. In both areas were distinguished glauconite, infilling spine channels of sponges and forams valves and also glauconite, origined due transphormation of biotite and other mineral grains. Data of K20 content proved studied glauconite forms as developed type and contain over 10 percent of heaving bundles (after Velde graph). According diffraction analysis investigated glauconite from gaizes and-siltstones are of an ordered 1 Md type