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)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
New 40Ar/39Ar ages and revised 40K/40Ar* data from nephelinitic-phonolitic volcanic successions of the Trindade Island (South Atlantic Ocean)
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 2.5 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 2.5 Ma to cease at ca. 1.6 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. 0.25 Ma). Thus, the volcanic activity in Trindade was ceased completely at ca. 0.25 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
نویسندگان
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