کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4747521 | 1359919 | 2009 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evidence of aerial volcanic activity during the Valanginian along the northern Tethys margin
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فسیل شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Stratigraphic measurement and sampling on three sections (Vergol, La Charce, and Montclus) through Valanginian deposits from the Vocontian Basin (southeastern France) reveals the occurrence of centimetre thick ochre-coloured layers, which can be correlated from one section to another. At least twelve of these are identified in sediments dated from the Pertransiens to Furcillata ammonite Zones. These horizons appear similar to previously described Oxfordian and Aptian bentonites, also from the Vocontian Basin. Clay-mineralogical and geochemical data are similar in the Valanginian ochre horizons and their enclosing marls except in one of these that shows a clay fraction mainly composed of smectite and which exhibits an enrichment in trace elements (Zr, Ba, Th, Y, Hf, U, Pb, Nb, Ta). This horizon occurs in sediments attributed to the Campylotoxus Zone and is interpreted as a bentonite while the other ochre horizons were derived from the meteoric weathering of pyrite, which probably developed in oxygen-depleted environments. Volcanic ash was presumed to be transported westward by trade winds from volcanic centres located along the northern active margin of the Tethys.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cretaceous Research - Volume 30, Issue 3, June 2009, Pages 533-539
Journal: Cretaceous Research - Volume 30, Issue 3, June 2009, Pages 533-539
نویسندگان
Corinne Fesneau, Jean-François Deconinck, Pierre Pellenard, Stéphane Reboulet,