Περιγραφή ερευνητικών γεωτρήσεων και χημική σύσταση μεταλλεύματος του κοιτάσματος χρωμίτη στο Ριζό Γρεβενών = Description of the exploration drillings and the chemical composition of the Chromite deposite at Rizo Grevena, NW Greece.
Περίληψη
This study focuses on the chromite deposit at Vourinos in Rizo of Grevena and the data obtained from the exploration drillings of the company “Hellenic Mines S.A”. The main goal was to describe the mineralization and the chemical composition of the ore at representative chromite samples. Chemical analyses were collected from the disseminated, the schlieren, the nodular and the massive chromite outcrops and from the altered and fresh dunites, hartzburgites and pyroxenites of the host rocks. Additional samples were collected during the company’s geological mapping and were analyzed at a certified lab in Finland for a large number of elements. Two more samples were collected from the surface mining site and the chemical analysis was perfomed at the laboratory of the company focusing only in Cr2O3. The description of the drillings shows that hartzburgite is the dominant rock with layers of dunite. The chromite deposit is found in the dunite layers. The most common types of chromite are schlieren, disseminated and sometimes massive, whereas in the middle sector of the site, nodular type can be found. According to the drilling logging chromite can be found at a depth between 705 and 640 meter. However there are no data below this depth. In this area, there are many faults with a W-E direction which have affected the mineralization and the host rocks. The chemical composition of the deposit shows that the dominant components of the mineralization are the MgO which ranges between 15.47 to 47.68 wt%, and SiO2 (8.06-72.07 wt%). The average concentration of Cr2O3 and Fe2O3 is 10 wt%. The content of Al2O3 is low and the density of the chromite ore ranges from 3.11 to 4.24 gr/cm3.Abstract
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Αρχειακό υλικό της εταιρείας «ΕΛΛΗΜΕΤ ΕΛΛΗΝΙΚΑ ΜΕΤΑΛΛΕΙΑ Α.Ε.»
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Ηλεκτρονικές πηγές
Sciencedirect.com/topics/earth-and-planetary-sciences/chromite
https://www.hellenicmines.com/?page_id=595
http://www.mlsi.gov.cy/mlsi/dli/dliup.nsf/D4F6D611A08F6287C2257EC2001E205C/$file/geotrisis.pdf
http://www.geo.auth.gr/courses/ggg/ggg875e/assets/1o-mathima-deigmatoleiptikes-geotriseis-2011.pdf
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