Mineral deposits in Miocene lacustrine and Devonian shallow-marine facies in Yugoslavia.

The lacustrine facies in Serbia contain sedimentary zeolites, bentonite, oil shale with authigenic minerals, magnesite and borates. Some of the deposits formed by diagenesis, including the alteration of volcanic glass. In some cases hot waters of volcanic origin migrated through serpentinites that underlie the lake basins, bringing magnesium to the lake water. Boron was derived by the leaching of volcanic and pyroclastic rocks by meteoric waters. The marine shallow-water facies mined at Tajmiste in western Macedonia include oolitic ironstones, mostly chamositic clays, which were deposited within a clastic sequence composed of clays, silts and sands which were subsequently metamorphosed. All primary structures were destroyed by metamorphism and/or tectonic activity. The internal structures of the chamosite ooids are mostly tangential, although in some cases they are radial. The iron had a multiple origin, including streams that drained weathered terrains and possibly upwelling deep basin waters.
The lacustrine facies in Serbia contain sedimentary zeolites, bentonite, oil shale with authigenic minerals, magnesite and borates. Some of the deposits formed by diagenesis, including the alteration of volcanic glass. In some cases hot waters of volcanic origin migrated through serpentinites that underlie the lake basins, bringing magnesium to the lake water. Boron was derived by the leaching of volcanic and pyroclastic rocks by meteoric waters. The marine shallow-water facies mined at Tajmiste in western Macedonia include oolitic ironstones, mostly chamositic clays, which were deposited within a clastic sequence composed of clays, silts and sands which were subsequently metamorphosed. All primary structures were destroyed by metamorphism and/or tectonic activity. The internal structures of the chamosite ooids are mostly tangential, although in some cases they are radial. The iron had a multiple origin, including streams that drained weathered terrains and possibly upwelling deep basin waters.