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POSSIBILITIES OF THE APPLICATION OF CARBONATE ROCKS OF THE RAIKKULA FORMATION (SILURIAN, ESTONIA)

1992; Estonian Academy Publishers; Volume: 41; Issue: 2 Linguagem: Inglês

10.3176/geol.1992.2.03

1736-7913

A Teedumäe,

Geological Studies and Exploration

The Raikkiila Formation consists of a great variety of limestones and dolomites.On the basis of the spatial distribution of different rock types, four areas can be distinguished.They have different prospects of revealing resources of carbonate rocks. 1.The Western area, where limestones occur, is prospective for the production of lime and construction materials. 2. The Rapla area has no prospects for revealing resources of limestone or dolomite of constant mineral composition.Both limestone and dolomite can be used for the production of construction materials. 3. The Paide area is represented by dolomites only and it is promising for revealing sizeable resources for the industry of construction materials.There are no preconditions for revealing resources of chemi- cally pure dolomites in this area as argillaceous interlayers occur throughout the whole section. 4. The Eastern area, where the Raikkiila Formation is represented by argillaceous dolomite and mainly cryptocrystalline (less bioclastic) limestone, is promising for the industry of construction materials.A very special type of bioclastic marble-like limestone (the so-called "Kalana marble") lies south of Po6ltsamaa.It can be used (and has been used) for lime and glass production and for small decorative and sculptural units.Depending on the variety of rock types in the sequence, selective mining and comprehensive utilization have to be practised on the whole outcrop of the Raikkiila Formation.