1,721,017 research outputs found
The feeding system of 1944 eruption of Vesuvius: melt inclusion data from dunitic nodules
No full textGlass-bearing felsic nodules from the crystallizing sidewalls of the 1944 Vesuvius magma chamber
No full textTracking mineral evolution and element mobility during albitisation and subsequent kaolinisation of phyllite rocks: A case study from the Verrucano of Monti Pisani, Tuscany, Italy
No full textThis work describes the first occurrence of albitite rocks in the Middle Triassic Verruca Formation, Monti Pisani, Northern Apennines, northern Tuscany, Italy. The albitite formed by Na-metasomatism of phyllites ('potassic white mica' + quartz + 'chlorite' + hematite + albite) in an amagmatic environment. The albitisation process took place after the Miocene main phases of Apenninic deformation and was followed by the formation of veins of Fe-carbonate + quartz. Hydrothermal alteration progressed with the ingression, possibly favoured by the increase of permeability due to albitisation, of a slightly acidic, oxidising, aqueous fluid that led to the pervasive kaolinisation of the albitite and to the complete transformation of the Fe-carbonate of the veins into Fe-hydroxides. This stage was followed by supergene alteration that led to the formation of a pervasive network of halloysite veinlets and colloform (P-Al-Si)-bearing Fe-hydroxides. Finally, the hydrothermally altered rock underwent a localised brittle fracturing without new minerals being formed. The prominent compositional changes occurring during this multi-stage hydrothermal process were the inversion of the Na2O/K2O ratio of the whole rock (from 0.07 in the pristine phyllite to up to 200 for the kaolinised albitite), the loss of Fe and Mg, and the enrichment of Sb. The MREE were partially lost, whereas LREE and HREE behaved conservatively. Though pervasive hydrothermal alteration occurrences are common in central-southern Tuscany, mostly related to the post-collisional extensional regime, lithospheric thinning and emplacement of magmatic bodies in the crust, the rare Monti Pisani kaolinised albitite described in this investigation expands the effects of post-collisional hydrothermal activity in Tuscany northwards, far from potential magmatic sources
Cataclasites and hydrothermal fluid flow in the Boccheggiano-Montieri area (southern Tuscany)
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Combined treatment with renin-angiotensin system blockers and polyunsaturated fatty acids in proteinuric IgA nephropathy: a randomized controlled trial.
No full textBackground. Currently, several therapeutic protocols exist for IgA nephropathy (IgAN); results in slowing the progression to end-stage renal disease (ESRD) are variable, but ∼30–40% of patients require replacement therapy (dialysis or renal transplantation) by 20 years from the onset. The adverse effects brought by the chronic assumption of drugs can be a potential limit. Actually, the most used therapies for IgAN are renin–angiotensin system blockers (RASB), glucocorticoids and immunosuppressive agents. Trials with polyunsaturated fatty acids (PUFA) in IgAN have been done since the first successful attempt by Hamazaki in 1984, resulting in alternate answers, but no trials have ever been done testing the efficacy of combined therapy with RASB and PUFA. Methods. We tested the effect of a 6-month course of PUFA (3 grams/day) in a group of 30 patients with biopsy-proven IgAN and proteinuria already treated with RASB randomized to receive PUFA supplementation or to continue their standard therapy. The primary end-point was the percent reduction of proteinuria from the baseline. Secondary end-points were modifications in glomerular filtration rate (GFR), blood pressure, serum triglycerides and erythrocyturia. Results. At the end of the 6-month trial, the percent reduction of proteinuria was 72.9% in the PUFA group and 11.3% in the RASB group ( P < 0.001). A reduction of ≥50% of baseline proteinuria was achieved in 80.0% of PUFA patients and 20.0% of RASB patients ( P = 0.002). Erythrocyturia was significantly lower in the PUFA group ( P = 0.031). No significant changes in renal function, blood pressure and triglycerides were observed. Conclusions. PUFA associated with RASB reduced proteinuria in patients with IgAN more than RASB alone
Integrated exploration of geothermal systems in Southern Tuscany for medium enthalpy resources detecting and possible exploiting through very low impact power plants
No full textThis paper presents the first results of an integrated
exploration program that has been developed for an
effective geothermal resource assessment in the
recently awarded Sorgenia exploration licences in Mt.
Amiata area
Fluid migration through extensional structures: constraints from fluid inclusion analyses in the Boccheggiano-Montieri area (southern Tuscany, Italy)
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