Instrumental methods applied in the investigations of carbonate minerals in the Middle Jurassic sideritic rocks with respect to diagenetic processes
Journal Title: Biuletyn Państwowego Instytutu Geologicznego - Year 2019, Vol 474, Issue 474
Abstract
Carbonate minerals in the Middle Jurassic sideritic rocks from the Polish Lowlands, north-eastern margin of the Holy Cross Mountains and the Częstochowa region have been studied applying accessible instrumental methods. The following techniques were applied: polarization microscope, staining with the Evamy’s solution, cathodoluminescence, microprobe, fluid inclusions and isotopic analyses. Most of these methods were not available either in the 20ies of the past century when studies of sideritic iron ores in Poland had begun, or in 50ies and 60ies when they were in full progress. The sideritic rocks are mainly represented by clayey siderites (they contain also muddy and sandy varieties), sideritic sandstones and sideritic coquina, less frequently by sideritic conglomerates and mudstones. Sideroplesite is the main carbonate mineral that builds the sideritic rocks, while pistomesite and siderite are less frequent. Fe-calcite and Fe-dolomite, ankerite, and sporadic dolomite occur in lesser amounts. Syderoplesite and siderite have crystallized in the early diagenesis (eodiagenesis), in the zone of microbiologic methanogenesis, at temperatures of about 20°C, from the porous waters of marine origin, or from marine waters mixed with fresh waters. Sideroplesite enriched in magnesium, pistomesite, calcite and ankerite sequently have formed at the later diagenetic stage (mezodiagenesis). These minerals have crystallized at temperatures above 60°C, from the porous waters of marine origin, or from the fluid which interacted with the adjacent rocks. Fe-calcite was formed in the zone of microbiologic methanogenesis, while the ankerite – in the zone of thermal decarboxylation.<br/><br/>
Authors and Affiliations
Aleksandra Kozłowska
Keywords
Related Articles
- EP ID EP518638
- DOI 10.5604/01.3001.0013.0837
- Views 50
- Downloads 0
VOLCANICLASTS OF LOWER CARBONIFEROUS ROCK FORMATIONS IN WESTERN POMERANIA
Lower Carboniferous rocks of Western Pomerania are interesting in terms of petrographic composition containing fragments of volcanic rock (called volcaniclasts). This unique volcanic material is abundant in Lower Carbon...
THE EFFECT OF TECTONIC DISCONTINUITIES UPON THE INTERNAL STRUCTURE OF COAL FROM SOME UPPER SILESIAN COAL BASIN COAL SEAMS OF PNIÓWEK, BORYNIA-ZOFIÓWKA AND BRZESZCZE
The petrographic features of hard coal coming from the Upper Silesian Coal Basin (USCB) coal seams are very different. Additionally some differences among them are associated with the influence of external tectonic facto...
NOWE DANE DOTYCZĄCE SKŁADU FIZYKOCHEMICZNEGO I IZOTOPOWEGO WÓD LECZNICZYCH ANTYKLINY IWONICZA-ZDROJU – RUDAWKI RYMANOWSKIEJ
Wody lecznicze antykliny Iwonicza-Zdroju – Rudawki Rymanowskiej charakteryzują się mineralizacją od 1,24 do 19,25 g/dm3. Wśród nich można wyróżnić dwa typy hydrogeochemiczne: wody Cl–HCO3– Na, eksploatowane w większości...
GEOCHEMICAL RECORD OF ENVIRONMENTAL POLLUTION OF THE Zn-Pb ORE HISTORIC MINE SITE AROUND NOWA GÓRA NEAR KRZESZOWICE (SOUTHERN POLAND)
The surveyed area is located in the northwestern part of Małopolska Voivodship. Detailed, multi-media geochemical research has been conducted due to distinct geochemical anomalies of Pb–Zn–Cd in soils and stream sediment...
THE OCCURRENCE AND PROSPECTIVE RESOURCES OF NICKEL ORES IN POLAND
In Poland, the only one documented nickel deposit is the saprolitic-type deposit in Szklary Lower Silesia, abandoned in 1983. Its documented balance resources are (b and c1 categories) ca. 117 thousands Mg of metallic n...