FEATURES OF MINERAL AND CHEMICAL COMPOSITION OF TECHNOGENIC-NATURAL TRAVERTINES FROM KRYVYI RIH REGION
Keywords:
travertine, calcite, tailings storage facility, underground water, Kryvyi Rih basin.Abstract
We investigated technogenic-natural travertines, which have been found in the tales of the beams Velyka Lozuvatka and Mala Lozuvatka near the Tailored Storage Facility of the Central Mining and Processing Plant. They are localized on the surface in the zone of leakage and evapo-ration of high-mineralized wastewater of storage tank. Travertines overlay the washed-out sur-face of Quaternary loess-like loams with intercalations of chernozem and form sub-horizontal layers and lenses with the capacity up to 0.5 m. They differ significantly from the sedimentary carbonate rocks of the Sarmatian age in the outcrops of the Velyka and Mala Lozyvatka beams and are not related to their redeposition. Travertines are white, light gray, less greenish and pale pink. Their texture is coarse-bedded, scaly, porous; the structure – fine-grained, cryptocrystalline. Here and there, travertine forms a loose earthy or cloddy mass of uncemented particles inside the packets of massive structure or on their surface. The main rock-forming mineral of travertine is calcite (55 %), secondary minerals – quartz (20), biotite (15), and goethite (8 %), accessory ones – rutile, magnetite, martite, and chlorite. Relict fragments of the host rocks are represented by grains of ferruginous quartzites, vein quartz, granites, etc. According to the results of spectral analysis, carbonate neoformations are significantly “cleaner” in relation to heavy metals (Ni, Cr, Cu, Pb, Ti, V, Co) and rare earth elements (Sc, Y, Zr, Nb, Ga, Be, Yb), than other Quaternary sediments. Earlier, there were reports about the presence of technogenic-natural aragonite pearls (“mine pearls”) and ore greywackes in the region. Travertine complements our knowledge about tech-nogenic-natural sedimentary rocks, which under present conditions are formed in the Kryvyi Rih basin.
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