Formacje metalogeniczne utworów jurajskich na obszarach platformowych Europy i terenach przyległych

Roman Osika

Abstract


W jurajskiej pokrywie platformowej Europy i krajów przyległych wyróżniono formację żelazonośną, fosforytonośną i surowców ilastych. Formacja żelazonośna występuje we Francji, Anglii i RFN (synemur, pliensbach, toars - aalen, bajos, oksford) i na platformie prekambryjskiej w rejonie Lipeck – Tuła oraz między Kirowem a Kamą (cały profil jury). Formacja fosforytonośna jest najlepiej rozwinięta na platformie prekambryjskiej w jurze górnej (poziom riazański). Ponadto w osadach jury występują złoża boksytów, kaolinów, iłów montmorillonitowych i glin ogniotrwałych, a także pojedyncze złoża rud manganu, cynku i ołowiu, soli kamiennej oraz strontu.

 

METALLOGENIC FORMATIONS IN JURASSIC ROCKS OF THE PLATFORM AND ADJOINING AREAS IN EUROPE

 

In Jurassic platform cover of Europe and adjacent areas, iron-bearing, phosphate-bearing, and clay raw material formations are differentiated. The cover also comprises single deposits or occurrences of manganese, zinc, and lead, accumulations of rock salt, and strontium deposits, not recognized as metallogenic formations. Figures 1 - 3 show distribution of the deposits at the background of

paleogeography, and Fig. 4 - in the vertical section of the Jurassic.

The iron-bearing formation has been found in vast areas in France, England, and FRG. Concentrations are the highest in the Sinemurian, Pliensbachian, at the Toarcian/Aalenian boundary, and also in Bajocian and Oxfordian. Ore horizons thin out and become more and more irregular to the east. In Poland, thin layers of iron ores occur in the Hettangian, Pliensbachian, Aalenian and Upper Bajocian but not Oxfordian. In the Lipeck-Tuła region and between Kirow add Kama in the Precambrian Platform area, iron ores occur throughout the Jurassic, especially in Middle Jurassic (Fig. 2).

The phosphate-bearing formation occurs in the Precambrian Platform area. It is known from Upper Jurassic (Riasanian) north of Moscow. The Jurassic cover of western and central European, Moesian, North African and Arabian platforms display numerous occurrences of phosphatic nodules (but without economic value) as well as widely distributed formation of fire-proof clays and bauxite-like raw materials.

Attention shoul be also paid to Lower Jurassic Zn-Pb ores from north-western margin of the

Central Massif, Jurassic deposits of rock salt and strontium, and the Czekokskoje rock salt deposit in the Upper Jurassic.

 


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