ORE MINERALIZATION IN ULTRAMAFICS FROM THE MNICH RIDGE FROM WESTERN PART OF THE BRASZOWICE–BRZEŹNICA MASSIF (LOWER SILESIA)
Journal Title: Biuletyn Państwowego Instytutu Geologicznego - Year 2011, Vol 447, Issue 447
Abstract
Ultramafic rocks of the Braszowice–Brzeznica massif consist of harzburgites, dunites and lherzolites that are serpentinised in various degree. These rocks are regard as upper part of ultramafic sequence of the Sudetic ophiolite complex. Ultramafic rocks of ophiolite sequences are often associated with important mineral deposits like chrome, nickel, cobalt and PGE. EPMA analyses show that the most aboundant ore minerals are oxides like chromite, ferrichromite, magnetite. Sulphide ore minerals are mainly Fe-Ni sulphides. Documented sulphides are: heazlewoodite (Ni[sub]3[/sub]S[sub]2[/sub]), pentlandite(Ni,Fe)[sub]9[/sub]S[sub]8[/sub], millerite (NiS), godlevskite (Ni[sub]7[/sub]S[sub]6[/sub]). In some sulphide grains occur nickel arsenides inclusions. Ore mineral are dispersed, forms xenomorphic grains from several µm to 4 mm in size. Primary ore minerals like chromite, pentlandite, pyrrhotite and chalkopyrite were affected by fluids, which results in precipitation of secondary mineral phases: Fe-Cr spinel, four generations of magnetite, Fe-Ni sulphides and Ni arsenides. During serpentinisation Cr, Al, Mg in chromite strutcutre were replaced by Fe. Result of this alteration is Fe-Cr spinel and magnetite Ia. Magnetite Ib crystalized in pseudomorphs after olivines and pyroxenenes. Magnetite II precipitate simultaneously with sulphides.
Authors and Affiliations
Katarzyna SADŁOWSKA
Keywords
Related Articles
- EP ID EP64244
- DOI -
- Views 51
- Downloads 0
THE CHARACTERISTICS OF PORE SPACE IN LOWER TRIASSIC SANDSTONES OF THE WARSAW REGION
Reservoir and sealing properties of Lower Triassic sandstones from seven boreholes of the central part of the Koszalin-Zamość Synclinorium were investigated in terms of potential levels for underground storage of carbon...
Środowiska sedymentacji i palinofacje kredy dolnej w kilku otworach wiertniczych centralnej Polski
Na podstawie badań litologicznych i profilowań sedymentologicznych, dokonano wstępnego rozpoznania środowisk sedymentacyjnych i palinofacji kredy dolnej centralnej części Niżu Polskiego w otworach wiertniczych Sarnów IG...
OKREŚLANIE WSPÓŁCZYNNIKA KONSOLIDACJI NA PODSTAWIE PRZEBIEGU JEDNOOSIOWEGO ODKSZTAŁCENIA GRUNTU I DYSTRYBUCJI CIŚNIENIA POROWEGO W BADANIACH IL PROWADZONYCH W KONSOLIDOMETRZE ROWE’A
Artykuł przedstawia nowe ujęcie interpretacji badań konsolidacji jednoosiowej, ukierunkowane na określenie optymalnych wartości współczynnika konsolidacji [i]c[/i][sub][i]v[/i][/sub]. W obliczeniach opartych na analizie...
THE RELIABILITY OF EVALUATION OF ELASTIC PROPERTIES OF ROCKS AT GREAT DEPTHS
The paper is an introduction to the other papers published in this volume, devoted to the methods and results of laboratory testing of rocks from great depths prepared by the authors from Department of Geomechanics: P. Ł...
THE QUALITY OF GROUNDWATER AND SURFACE WATER NEAR THE SOKOLNIK LANDFILL (MIŃSK DISTRICT)
The article presents the results of own and archive chemical analyses of groundwater and surface water from the Sokolnik landfill area. Chemical composition of the waters points at a significant transformation of the aqu...