کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4729840 1356579 2006 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The North–South Paleozoic to Quaternary trend of alkaline magmatism from Niger–Nigeria to Cameroon: Complex interaction between hotspots and Precambrian faults
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
The North–South Paleozoic to Quaternary trend of alkaline magmatism from Niger–Nigeria to Cameroon: Complex interaction between hotspots and Precambrian faults
چکیده انگلیسی

The alkaline magmatism from Niger–Nigeria to Cameroon forms large scale magmatic provinces across the African plate. It displays a N–S trend from Aïr in Niger to Jos Plateau in Nigeria changing southeastwards towards Cameroon. We have compiled recent petrological, geochemical and structural data on these magmatic provinces. The data show that although there is a general age decrease from one province to another (407 ± 8 Ma in Aïr to ⩽66 Ma in Cameroon), there is no age migration in any given province, except in the Nigeria province (Younger Granites) where a rough NE–SW age decrease is observed. The relationship between these different magmatic provinces that share similar geochemical data, added to the SW–NE parallel trends of Nigeria, Benue Trough and Cameroon Line, is difficult to explain in terms of a simple northward motion of the African plate over a single hotspot. In the light of recent tectonic models, we suggest complex interaction between, on the one hand, at least two mantle plumes acting in succession (including the St. Helena mantle plume) and, on the other hand, lithospheric fractures that induce oblique alignments of new magmatic complexes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of African Earth Sciences - Volume 45, Issue 3, July 2006, Pages 241–256
نویسندگان
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