1,721,119 research outputs found
Influence of temperature and composition on Mg-Fe2+ intracrystalline distribution in olivines.
No full textMineralogy of silt and clay fractions in the superficial sediments of the grado lagoon (Northern Adriatic Sea).
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Detrital high pressure – low temperature minerals in Lower Eocene deep-sea turbidites of the Julian Alps (NE Italy)
No full textNoduli ferrosi nelle grotte delle Valli del Natisone (Friuli)
No full textIn questo articolo vengono descritti i noduli ferrosi presenti nei sedimenti recenti delle grotte delle Valli del Natisone (Prealpi Giulie, Friuli orientale). Sulla base di osservazioni macroscopiche, microscopiche, mineralogiche e chimiche i noduli sono stati distinti in varie categorie per ognuna delle quali è stata supposta una genesi diversa. Vengono quindi proposti dei modelli per la loro formazione e crescita.
In this article ferrous nodules of recent sediments from the Natisone Valley caves (Friuli, NE Italy) are described. According to macroscopic, microscopic, mineralogical and chemical observations, nodules have been subdivided into different categories. For each category a different origin has been supposed. Then some models for nodules’ genesis and growth have been suggested
First occurrence of titanomagnetites from the websterite dykes within Balmuccia peridotite (Ivrea-Verbano zone): Crystal chemistry and structural refinement
No full textThe crystal chemistry of three ulvöspinels from the websteritic dykes within the Balmuccia peridotites has been investigated by means of X-ray single crystal diffraction and electron microprobe. They are very similar each other with cell edge about 8.43 Å and oxygen positional parameter between 0.2565 and 0.2570. Ti content is about 0.32 a.p.f.u..As they are embedded in a glass with syenite composition it is supposed they quenched during the rapid cooling of a melt pervading the websteritic dykes. This is the first finding of similar spinels in the studied area
La muscovite nelle sabbie della Risorgiva Da Rio e dell’Abisso degli Incubi (Alpi Carniche).
No full textLe argille superficiali e sotterranee delle Valli del Natisone. In: Il fenomeno carsico delle Valli del Natisone (Prealpi Giulie – Friuli).
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