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Titlebook: Geology and Mineral Resources of West Africa; J. B. Wright,J. B. Wright Book 1985 J. B. Wright, D. A. Hastings, W. B. Jones & H. R. Willia

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发表于 2025-3-21 18:29:38 | 显示全部楼层 |阅读模式
书目名称Geology and Mineral Resources of West Africa
编辑J. B. Wright,J. B. Wright
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图书封面Titlebook: Geology and Mineral Resources of West Africa;  J. B. Wright,J. B. Wright Book 1985 J. B. Wright, D. A. Hastings, W. B. Jones & H. R. Willia
描述In this text, attention is focused mainly on those literature is accessible, however, it is to be expected countries in western Africa lying south of the Sahara, that teachers and lecturers will know of it and will be that is, between about SON and 15°N, and westward able to acquaint their students with it, where neces­ of about 15°E. Parts of the region as far north as sary. about 200N are considered from time to time, for A glossary of terms is provided at the end of the purposes of correlation and cQntinuity. The map on volume, and there is a summary at the beginning of p. xiii indicates the approximate extent of the cover­ each chapter. age. This book is dedicated to the many colleagues and The principal aim is to provide a broad view of students with whom we have worked in West Africa West African geology as a whole, for undergraduates and who have stimulated and encouraged our teach­ who are studying for honours degrees in geology and ing and research in various ways. We hope also that it may help the work of international organizations who already have an understanding of basic geologi­ cal principles. It is increasingly important that such as AGID, CIFEG and UNESCO to encou
出版日期Book 1985
关键词diamonds; geology; geomorphology; map; economic geology
版次1
doihttps://doi.org/10.1007/978-94-015-3932-6
isbn_softcover978-94-015-3934-0
isbn_ebook978-94-015-3932-6
copyrightJ. B. Wright, D. A. Hastings, W. B. Jones & H. R. Williams 1985
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发表于 2025-3-21 21:13:03 | 显示全部楼层
发表于 2025-3-22 01:35:35 | 显示全部楼层
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
发表于 2025-3-22 05:25:19 | 显示全部楼层
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
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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
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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
发表于 2025-3-23 01:13:25 | 显示全部楼层
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
发表于 2025-3-23 01:51:21 | 显示全部楼层
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
发表于 2025-3-23 07:58:29 | 显示全部楼层
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