کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8911319 1638267 2018 43 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The monogenetic Bayuda Volcanic Field, Sudan - New insights into geology and volcanic morphology
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
The monogenetic Bayuda Volcanic Field, Sudan - New insights into geology and volcanic morphology
چکیده انگلیسی
The BVF cinder cones are dominated by scoracious lapilli tephra units, emplaced mainly by pyroclastic fallout from Strombolian eruptions. Many cones are breached and are associated with lava flows. The subordinate phreatomagmatism represented by maar volcanoes suggests the presence of ground and/or shallow surface water during some of the eruptions. The deposits constituting the rims around the maar volcanoes are interpreted as having mostly formed due to pyroclastic surges. Many of the tephra rings around the maars are underlain by thick older lava flows. These are inferred to be the horizons where rising magma interacted with groundwater. The existence of phreatomagmatic deposits may point to a time of eruptive activity during a phase with wetter conditions and therefore higher groundwater levels than those encountered historically. This is supported by field observations as well as the morphological analysis, providing evidence for relatively high degrees of alteration of the BVF volcanoes and therefore older eruption ages as suggested by some researchers. A Lower Holocene to Upper Pleistocene age is proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Volcanology and Geothermal Research - Volume 356, 1 May 2018, Pages 211-224
نویسندگان
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