کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5783859 | 1638287 | 2017 | 84 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Glass geochemistry of pyroclastic deposits from the Aeolian Islands in the last 50 ka: A proximal database for tephrochronology
ترجمه فارسی عنوان
ژئوشیمی شیشه ای از رسوبات پری کلاستی از جزایر ائولین در آخرین 50 کا: پایگاه داده های پروگزیمال برای تفرروفنولوژی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
Volcanic ash (<Â 2Â mm) erupted from the Aeolian Islands is reported distally as layers in sedimentary archives from across the central Mediterranean region. Here we present volcanic glass geochemistry of proximal tephra deposits from explosive eruptions on the islands of Vulcano, Lipari, Salina and Stromboli spanning approximately the last 50Â ka using grain-specific EMPA and LA-ICP-MS. This comprehensive database of volcanic glass compositions (>Â 1000 analyses) provides a basis for proximal-distal and distal-distal tephra correlations. Tephra deposits from the different Aeolian Islands are geochemically diverse; with some individual eruptions showing diagnostic geochemical heterogeneity recognised both stratigraphically and/or spatially. Major element glass analyses reveal that Vulcano (0-21Â ka) and Stromboli (4-13Â ka) have erupted potassic (shoshonitic and K-series) tephra with broadly overlapping compositions, but data presented here demonstrates that their eruptive products can be distinguished using either TiO2 contents or their HFSE/Th ratios. Whilst individual volcanic sources often produce successive tephra deposits with near identical major and minor element compositions through time (i.e., Lipari, Vulcano), trace element glass data can help to decipher successive eruptions. Changes in LREE and Th concentrations of volcanic glasses erupted spanning approximately the last 50Â ka greatly enhance the potential to discriminate successive eruptive units on Lipari. The new proximal glass database has been used to verify new (Ionian Sea; core M25/4-12) and existing distal occurrences of Aeolian Island derived tephra enabling the reassessments of past ash dispersals. Finally, proximal and distal data have been used to establish an integrated proximal-distal eruptive event stratigraphy for the Aeolian Islands.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Volcanology and Geothermal Research - Volume 336, 15 April 2017, Pages 81-107
Journal: Journal of Volcanology and Geothermal Research - Volume 336, 15 April 2017, Pages 81-107
نویسندگان
Paul G Albert, Emma L Tomlinson, Victoria C Smith, Federico Di Traglia, Marco Pistolesi, Anna Morris, Paola Donato, Rosanna De Rosa, Roberto Sulpizio, Jörg Keller, Mauro Rosi, Martin Menzies,