کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8910502 | 1637499 | 2017 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of iron and nanolites on Raman spectra of volcanic glasses: A reassessment of existing strategies to estimate the water content
ترجمه فارسی عنوان
اثر آهن و نانولیت ها بر روی طیف های رامان عینک آتشفشانی: بررسی مجدد استراتژی های موجود برای برآورد میزان آب
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کلمات کلیدی
طیف سنجی رامان، عینک، اب، اهن، نانولیت ها،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
The effect of iron content and iron nanolites on Raman spectra of hydrous geologically-relevant glasses is presented. Current procedures to estimate the water content using Raman spectra were tested to explore potential effects of iron content, its oxidation state, and nanolites on models' reliability. A chemical interval spanning from basalt to rhyolite, including alkali- and iron-rich compositions, with water content up to 5.6Â wt% was investigated using two spectrometers. When considering nanolite-free samples, the area of the band at 3550Â cmâ1 linearly correlates with the sample water content regardless of chemical composition. Using this approach, data were reproduced with a root-mean-square error (RMSE) of ~Â 0.15Â wt%. Depending on the sample chemistry, water content, and acquisition conditions the laser-induced sample oxidation led to underestimating the water content up to ~Â 90% with a long acquisition time (26Â min). Normalising the water band region to the silicate band region minimises such a limitation. The area ratio between these bands linearly correlates with the water content and the use of different baseline procedures does not remove the dependence of such a correlation by the iron content and its oxidation state. With this procedure, data were reproduced with a RMSE of ~Â 0.16Â wt%. For both approaches, the presence of iron nanolites may result in underestimating the water content.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 475, 25 December 2017, Pages 76-86
Journal: Chemical Geology - Volume 475, 25 December 2017, Pages 76-86
نویسندگان
Danilo Di Genova, Stefania Sicola, Claudia Romano, Alessandro Vona, Sara Fanara, Laura Spina,