کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1240337 1495724 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Testing a portable laser-induced breakdown spectroscopy system on geological samples
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Testing a portable laser-induced breakdown spectroscopy system on geological samples
چکیده انگلیسی

This paper illustrates the potentialities of a home-made portable LIBS (laser-induced breakdown spectroscopy) instrument in Earth sciences, more particularly in geochemically recognizing (i) tephra layers in lacustrine sediments and (ii) fossilization processes in ammonites. Abundances for selected lines of Al, Ca, Fe, Ti, Ba and Na were determined in lacustrine chalk sediments of the Jura, where the Laacher See Tephra (LST) layer is recorded. A statistical treatment of elemental maps produced from the section of a sedimentary column containing the LST event allows instrumental conditions to be optimized. Accumulating spectra from close shot positions gives better results than multiplying shots at the same location. A depth profile method was applied to study ammonite fossilization (pyritization, phosphatization) processes. Depth variations of Fe, Ca, Al intensities, and Fe/Ca and Al/Ca ratios provide indications about pyritization, but phosphatization processes cannot be determined with our device.


► Element cartography maps for sediment which contains tephra layer have been created.
► The maps have been used for on-site conditions determination by statistical treatment.
► Pyritization process on ammonite surface was identified successfully.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volumes 74–75, August–September 2012, Pages 57–65
نویسندگان
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