Tagasi otsingusse
Sturesson et al., 1999

Lower Ordovician iron ooids and associated oolitic clays in Russia and Estonia: A clue to the origin of iron oolites?

Sturesson, U., Dronov, A. V., Saadre, T.
DOI
DOI10.1016/S0037-0738(98)00112-2
Aasta1999
AjakiriSedimentary Geology
Köide123
Number1
Leheküljed63-80
Tüüpartikkel ajakirjas
Eesti autor
Keelinglise
Id9056

Abstrakt

On the Baltic platform a lower Llanvirn (Ordovician) iron oolite can be traced for a distance of 1200 km from Norway to the east of Lake Ladoga in Russia. This oolite is usually thin (seldom exceeding 0.5 m) and is dominated by goethite (limonite) type ooids. The easternmost part of the oolite, from Tallinn to Ladoga, is examined here. The oolitic limestone is intercalated with oolitic clay beds. The mineralogical, chemical and isotopic composition and other indicators point to volcanic ash being the source for the clay. Similarities in REE distribution patterns and immobile element contents between ooids and the oolitic clay suggest that the ooids were also formed from volcanic ash.

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