دورية أكاديمية
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Aggregation in particle rich environments: a textural study of examples from volcanic eruptions, meteorite impacts, and fluidized bed processing.

التفاصيل البيبلوغرافية
العنوان: Aggregation in particle rich environments: a textural study of examples from volcanic eruptions, meteorite impacts, and fluidized bed processing.
المؤلفون: Mueller SB; 1Ludwig-Maximilians-Universität München LMU, Munich, Germany., Kueppers U; 1Ludwig-Maximilians-Universität München LMU, Munich, Germany., Huber MS; 2University of the Free State, Bloemfontein, South Africa.; 3Vrije Universiteit Brussel, Brussels, Belgium., Hess KU; 1Ludwig-Maximilians-Universität München LMU, Munich, Germany., Poesges G; Ries Krater Museum Nördlingen, Nördlingen, Germany., Ruthensteiner B; 5Zoologische Staatssammlung München, Munich, Germany., Dingwell DB; 1Ludwig-Maximilians-Universität München LMU, Munich, Germany.
المصدر: Bulletin of volcanology [Bull Volcanol] 2018; Vol. 80 (4), pp. 32. Date of Electronic Publication: 2018 Mar 02.
نوع المنشور: Journal Article
اللغة: English
بيانات الدورية: Publisher: Springer International Country of Publication: Germany NLM ID: 101659484 Publication Model: Print-Electronic Cited Medium: Print ISSN: 0258-8900 (Print) Linking ISSN: 02588900 NLM ISO Abbreviation: Bull Volcanol Subsets: PubMed not MEDLINE
أسماء مطبوعة: Original Publication: Heidelberg, Federal Republic of Germany : Springer International, c1986-
مستخلص: Aggregation is a common process occurring in many diverse particulate gas mixtures (e.g. those derived from explosive volcanic eruptions, meteorite impact events, and fluid bed processing). It results from the collision and sticking of particles suspended in turbulent gas/air. To date, there is no generalized model of the underlying physical processes. Here, we investigate aggregates from 18 natural deposits (16 volcanic deposits and two meteorite impact deposits) as well as aggregates produced experimentally via fluidized bed techniques. All aggregates were analyzed for their size, internal structuring, and constituent particle size distribution. Commonalities and differences between the aggregate types are then used to infer salient features of the aggregation process. Average core to rim ratios of internally structured aggregates (accretionary lapilli) is found to be similar for artificial and volcanic aggregates but up to an order of magnitude different than impact-related aggregates. Rim structures of artificial and volcanic aggregates appear to be physically similar (single, sub-spherical, regularly-shaped rims) whereas impact-related aggregates more often show multiple or irregularly shaped rims. The particle size distributions (PSDs) of all three aggregate types are similar (< 200 μm). This proves that in all three environments, aggregation occurs under broadly similar conditions despite the significant differences in source conditions (particle volume fraction, particle size distribution, particle composition, temperature), residence times, plume conditions (e.g., humidity and temperature), and dynamics of fallout and deposition. Impact-generated and volcanic aggregates share many similarities, and in some cases may be indistinguishable without their stratigraphic context.
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فهرسة مساهمة: Keywords: Granulation; Meteorite impact; Particle aggregation; Volcanic ash
تواريخ الأحداث: Date Created: 20180313 Latest Revision: 20201001
رمز التحديث: 20221213
مُعرف محوري في PubMed: PMC5834565
DOI: 10.1007/s00445-018-1207-3
PMID: 29527084
قاعدة البيانات: MEDLINE
الوصف
تدمد:0258-8900
DOI:10.1007/s00445-018-1207-3