标题：Late Visean tholeiitic rocks of the Mechraa Ben Abbou Basin (Northern Rehamna, Western Meseta, Morocco): Petrography, geochemistry and geodynamic setting
期刊名称：International Research Journal of Earth Sciences
电子版ISSN：2321-2527
出版年度：2019
卷号：7
期号：2
页码：1-12
语种：English
出版社：International Science Community Association
摘要：The magmatic activity related to the Moroccan Variscides is expressed in the Mechraa Ben Abbou Basin (Northern Rehamna, Western Meseta, Morocco) by Visean basic rocks represented by gabbros, dolerites and basalt sills. Basic rocks display an equigranular textures for the gabbros, intersertal ophitic and subophitic for the dolerite and the basalts are mostly porphyritic and have vacuoles within the microlithic matrix. These rocks show a simple primary mineral association made up of plagioclase, clinopyroxene, and iron oxides, chlorite and calcite as secondary minerals. Thirteen geochemical analyses carried out on these rocks suggest a tholeiitic continental affinity. These rocks were originated in a post-collisional scenario that have inherited their orogenic signature after the subduction of the Rheic Ocean during Late Devonian.
关键词：Mechraa Ben Abbou Basin;tholeiitic;orogenic context;subduction of the Rheic Ocean
