MINERALOGICAL AND STRUCTURAL FINGERPRINT METHODS OF NANOMINERALS IDENTIFICATION
Journal Title: Journal of Science And Arts - Year 2008, Vol 9, Issue 2
Abstract
The combined investigation techniques, electron probe microanalysis (EPMA), Mössbauer spectroscopy (NGR), transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray diffraction (XRD) evidenced the third level of the inclusions at nanosize scale for specific minerals of different Romanian metamorphic deposits. So, NGR technique reveals the contribution of the (Mn, Fe) oxides - small particles at standard (RT) and at very low temperature (LHeT) in the 57Fe γ-ray signal of manganoan fayalites (Razoare deposit). The EM analysis techniques confirmed the presence of the nanometric Fe and Mn oxides inclusions in manganoan fayalites, as well as of pyroxferroite (Razoare deposit). On the other hand, an extensive investigation of the gold ores in the South Carpathians (Costesti, Valea lui Stan and Jidostita) has been performed by using a fruitful combination among the above mentioned complementary mineralogical and structural methods. The investigation of the representative sulfide samples by the structural techniques relieved new minerals in the gold ores, the presence of submicroscopic inclusions of guytenboaardtite, cobaltite and loellingite as well as the “coral like” aggregates ofnanometric gold.
Authors and Affiliations
Sorin Silviu Udubasa, N. Popescu-Pogrion, Ion V. Popescu, Serban Constantinescu, Gheorghe Udubasa
Keywords
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