板条箱
发表于 2025-3-21 18:29:38
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殖民地
发表于 2025-3-21 21:13:03
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有节制
发表于 2025-3-22 01:35:35
The Proterozoic of West African is identified as consisting of metasediments, the Upper Biri-mian of metavolcanics, and the Tarkwaian rocks are considered to lie unconformably on the Birimian. In Ivory Coast and Upper Volta, no such clearcut subdivisions are recognised. The metavolcanics are considered to be either older than or
中古
发表于 2025-3-22 05:25:19
The Pan African of West Africa — the eastern domainPan African ages (.. 450–650 Ma). The eastern boundary between the craton and the Pan African terrane is a broad zone of high-angle thrusting towards the west, called the Togo belt. This boundary has been identified as a crustal suture formed by collision with a somewhat poorly defined East. Saharan
BLA
发表于 2025-3-22 10:44:06
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Generosity
发表于 2025-3-22 15:17:05
Infracambrian to Lower Palaeozoic basinszoic, and the sediments were later gently folded by the Mauritanide deformation. There is an Ordovician tillite in the western Taoudeni Basin..The Bové Basin developed on the cratonic block that separates the Rokelide belt from the south-west trending arm of the Mauritanide belt. There are Palaeozoi
Generosity
发表于 2025-3-22 19:44:11
Introduction to anorogenic magmatismt African craton, the Younger Granites to Pan African terranes. Post-Jurassic magmatism occurred mainly in the Pan African terrane east of the craton..Kimberlites and peralkaline intrusions were emplaced at several localities on the West African craton, some probably of Cretaceous age, others perhap
Constituent
发表于 2025-3-23 01:13:25
The Younger Granitesprogressively younger towards the centre, but many complexes depart from this ideal..The dominant granites of the complexes range from peraluminous to peralkaline in composition and they are associated with smaller amounts of syenite, gabbro and anorthosite. Some of these magmas originated in the up
jovial
发表于 2025-3-23 01:51:21
Cretaceous and Cenozoic magmatismgacrysts and upper mantle inclusions. The Cameroun line forms the major part of the Gulf of Guinea province, with large shield volcanoes and basalt plateaux, also plugs of phonolite, trachyte and rhyolite. There was minor Cenozoic volcanism in the Dakar region of Senegal..Most of the Cenozoic magmat
oncologist
发表于 2025-3-23 07:58:29
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