کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5783794 | 1638295 | 2016 | 28 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
New 40Ar/39Ar ages and revised 40K/40Ar* data from nephelinitic-phonolitic volcanic successions of the Trindade Island (South Atlantic Ocean)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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چکیده انگلیسی
The geochronological dataset show that the nephelinitic-phonolitic volcanism at Trindade was discontinuous throught time, being marked by periods of high volcanic activity and periods of quiescence, which suggests variable melt production and eruption rates. The peak of the volcanic activity occurred between 3.9 and 2.5Â Ma (i.e., Lower Pliocene to Lower Pleistocene) that is represented by the TC, which correspond to the largest volume of volcanic deposits preserved in the island. The volcanic activity slows down progressively from 2.5Â Ma to cease at ca. 1.6Â Ma, period that is represented by the DF. This volcanism was followed by a quiescent period that lasted until the ephemeral nephelinitic volcanism of the MV (no age), VA (no age) and PF (ca. 0.25Â Ma). Thus, the volcanic activity in Trindade was ceased completely at ca. 0.25Â Ma, event registered in the uppermost volcanic deposits of the PF and that represents the last volcanic activity in the Brazilian territory.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Volcanology and Geothermal Research - Volume 327, 15 November 2016, Pages 531-538
Journal: Journal of Volcanology and Geothermal Research - Volume 327, 15 November 2016, Pages 531-538
نویسندگان
G.L.C. Pires, E.M. Bongiolo, M.C. Geraldes, C. Renac, A.C. Santos, F. Jourdan, R. Neumann,