International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

MINERAL AND CHEMICAL COMPOSITION OF MANGANESE HARDGROUNDS IN JURASSIC LIMESTONES OF THE WESTERN CARPATHIANS

Pages: 317 - 328

Authors: IGOR ROJKOVIC, ROMAN AUBRECHT, MILAN MISIK

Abstract: Manganese crusts and nodules in Jurassic limestones correspond to those formed on recent submarine pelagic or hemipelagic non-deposition surfaces and hardgrounds. The ore mineralization is represented by pyrolusite, romancchite, manganite, and iron hydroxides. The structure of the manganese minerals, Mn/Fe and Si/Al ratio and Co, Cu, Ni and REE distribution in the ores indicate hydrogenetic and diagenetic accumulation of manganese minerals. Later, Cretaceous supergene accumulation filled fissures and cavities in the limestones.

Keywords: Tethys, Jurassic, manganese minerals, hardgrounds, chemical composition

Download PDF document Show Text Version