標(biāo)題: 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 [打印本頁(yè)] 作者: 板條箱 時(shí)間: 2025-3-21 18:29
書目名稱Geology and Mineral Resources of West Africa影響因子(影響力)
書目名稱Geology and Mineral Resources of West Africa影響因子(影響力)學(xué)科排名
書目名稱Geology and Mineral Resources of West Africa網(wǎng)絡(luò)公開度
書目名稱Geology and Mineral Resources of West Africa網(wǎng)絡(luò)公開度學(xué)科排名
書目名稱Geology and Mineral Resources of West Africa被引頻次
書目名稱Geology and Mineral Resources of West Africa被引頻次學(xué)科排名
書目名稱Geology and Mineral Resources of West Africa年度引用
書目名稱Geology and Mineral Resources of West Africa年度引用學(xué)科排名
書目名稱Geology and Mineral Resources of West Africa讀者反饋
書目名稱Geology and Mineral Resources of West Africa讀者反饋學(xué)科排名
作者: 殖民地 時(shí)間: 2025-3-21 21:13 作者: 有節(jié)制 時(shí)間: 2025-3-22 01:35
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作者: 中古 時(shí)間: 2025-3-22 05:25
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作者: BLA 時(shí)間: 2025-3-22 10:44 作者: Generosity 時(shí)間: 2025-3-22 15:17
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作者: Generosity 時(shí)間: 2025-3-22 19:44
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作者: Constituent 時(shí)間: 2025-3-23 01:13
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作者: jovial 時(shí)間: 2025-3-23 01:51
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作者: oncologist 時(shí)間: 2025-3-23 07:58 作者: oncologist 時(shí)間: 2025-3-23 13:21 作者: nocturia 時(shí)間: 2025-3-23 17:30 作者: 功多汁水 時(shí)間: 2025-3-23 18:21 作者: 榮幸 時(shí)間: 2025-3-24 01:29 作者: 明確 時(shí)間: 2025-3-24 06:20
,Solit?re Rundschatten der Lungen,zoic, 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作者: 復(fù)習(xí) 時(shí)間: 2025-3-24 07:37 作者: COW 時(shí)間: 2025-3-24 12:59 作者: 莎草 時(shí)間: 2025-3-24 16:47 作者: defile 時(shí)間: 2025-3-24 23:05 作者: MAZE 時(shí)間: 2025-3-24 23:41 作者: Obsequious 時(shí)間: 2025-3-25 05:58
The Pan African of West Africa — the western domain作者: Dislocation 時(shí)間: 2025-3-25 09:16 作者: 嗎啡 時(shí)間: 2025-3-25 13:40 作者: 煩人 時(shí)間: 2025-3-25 19:46
https://doi.org/10.1007/978-3-663-16060-1ent + intrusive granites) is dominant in areal terms. Metavolcanic greenstone lithologies form the lower parts of supracrustal sequences, particularly in the west, but become less important in the east where the sequences are thinner, higher metamorphic grades are typical and banded iron formations 作者: CLASP 時(shí)間: 2025-3-25 23:31
https://doi.org/10.1007/978-3-642-91322-8urnian thermo-tectonic event about 2 billion years ago. The supracrustals were probably deposited at least partly upon an older Liberian basement, but evidence for this is not conclusive..Both metavolcanic greenstone-type lithologies and metasediments occur among the Birimian sequences, the former p作者: Kindle 時(shí)間: 2025-3-26 02:19
Reamplification of Eluted cDNAs,dominated by clastic metasediments, but basic and ultrabasic and banded iron formation lithologies also occur. Most of the belts are probably late Proterozoic in age, deformed and metamorphosed in the Pan African (550 Ma), though some bear the imprint of a Kibaran event (.. 1100 Ma). The extensive b作者: MIME 時(shí)間: 2025-3-26 07:40 作者: ASSET 時(shí)間: 2025-3-26 10:35 作者: curriculum 時(shí)間: 2025-3-26 12:42
,Solit?re Rundschatten der Lungen,nset of sedimentation at around 1000 Ma ago, and products of a late Precambrian glaciation are recognised in both basins, marked by a distinctive association of tillite, limestone with barite, and chert..In the Volta Basin, the sediments can be correlated with rocks of the Togo belt, and the main ph作者: appall 時(shí)間: 2025-3-26 20:21 作者: Hla461 時(shí)間: 2025-3-26 23:58
Allgemeine Schmerzen im Abdomen,bably by later adjustments along faults in the underlying basement. The Bida Basin is a shallow unfaulted arm of the Benue Trough. The Benue Trough probably provided the major link between the Mediterranean (Tethys Ocean) and Gulf of Guinea via the lullmedden and Chad Basins, during Upper Cretaceous作者: 寵愛 時(shí)間: 2025-3-27 02:30 作者: urethritis 時(shí)間: 2025-3-27 07:41 作者: 擴(kuò)大 時(shí)間: 2025-3-27 10:43 作者: 脫落 時(shí)間: 2025-3-27 15:07 作者: 消毒 時(shí)間: 2025-3-27 21:31
Symptome von seiten des Blutes,re diamondiferous. A suspected kimberlite in Nigeria is probably a basaltic explosion vent..In the Benue Trough there is a pre-Cretaceous suite of mainly acid igneous rocks. During the Upper Cretaceous mainly basic rocks were erupted and intruded among the sediments of the trough..Cenozoic volcanism作者: 勾引 時(shí)間: 2025-3-27 22:13 作者: 巧辦法 時(shí)間: 2025-3-28 06:07 作者: 離開可分裂 時(shí)間: 2025-3-28 08:53 作者: Tractable 時(shí)間: 2025-3-28 13:13
Ascites und Anschwellung des Leibes,owever, has had more to do with levels of erosion, relative abundance of different rock types, climatic changes, erosion levels and intensity of weathering than with the fundamentals of global tectonics. Rock associations remain the most important control on the occurrence of mineral deposits.作者: incubus 時(shí)間: 2025-3-28 16:16 作者: daredevil 時(shí)間: 2025-3-28 21:49
The Precambrian of West Africa — synthesis and reviewowever, has had more to do with levels of erosion, relative abundance of different rock types, climatic changes, erosion levels and intensity of weathering than with the fundamentals of global tectonics. Rock associations remain the most important control on the occurrence of mineral deposits.作者: magnanimity 時(shí)間: 2025-3-28 23:49
Economic potential of the younger sedimentary basins are generally not so large or abundant as in basement terranes, but include ores of lead, zinc, iron and manganese, and there may also be some bauxite. Smaller deposits of these various resources are already exploited on a small scale.作者: 帶來(lái)的感覺 時(shí)間: 2025-3-29 06:13
Allgemeine Schmerzen im Abdomen,coastal basins, the Senegal Basin is by far the largest, but the basins along the southern coast of West Africa are larger than their surface extents suggest, as substantial parts of their successions are offshore.作者: 激怒 時(shí)間: 2025-3-29 10:15
The Benue Trough and coastal basinscoastal basins, the Senegal Basin is by far the largest, but the basins along the southern coast of West Africa are larger than their surface extents suggest, as substantial parts of their successions are offshore.作者: 使痛苦 時(shí)間: 2025-3-29 14:13 作者: Pruritus 時(shí)間: 2025-3-29 15:57 作者: 遵循的規(guī)范 時(shí)間: 2025-3-29 21:41
,Solit?re Rundschatten der Lungen,ntial thickness of Quaternary sediments in the Chad Basin..Cretaceous marine sedimentation was of shallow-water type, depositing limestones, sandstones and shales, with lithologies and fossils that indicate generally warm climatic conditions throughout. Maximum sediment thicknesses in the lullmedden and Chad Basins are of the order of 2000–3000 m.作者: 贊美者 時(shí)間: 2025-3-30 00:08 作者: Thyroiditis 時(shí)間: 2025-3-30 04:46 作者: 虛情假意 時(shí)間: 2025-3-30 09:46
Mesozoic to Tertiary basins — inland basinsntial thickness of Quaternary sediments in the Chad Basin..Cretaceous marine sedimentation was of shallow-water type, depositing limestones, sandstones and shales, with lithologies and fossils that indicate generally warm climatic conditions throughout. Maximum sediment thicknesses in the lullmedden and Chad Basins are of the order of 2000–3000 m.作者: Density 時(shí)間: 2025-3-30 15:24
The Permo-Triassic dolerites and carbonatiteshe newly discovered nepheline syenite-carbonatite complexes on the eastern margin of the West African craton, which are dated as Lower Permian (c. 265 Ma) and were emplaced in a well defined continental rift setting.作者: 保存 時(shí)間: 2025-3-30 20:12 作者: PRISE 時(shí)間: 2025-3-30 22:47
Crustal development in West Africad orogenic events of deformation and regional metamorphism. The age of a particular geological province represents the time of the last of these events..Regional patterns of the West African Precambrian show some striking similarities, irrespective of age. In many areas a three-fold subdivision can 作者: BARB 時(shí)間: 2025-3-31 01:50 作者: 合適 時(shí)間: 2025-3-31 06:03
The Proterozoic of West Africaurnian thermo-tectonic event about 2 billion years ago. The supracrustals were probably deposited at least partly upon an older Liberian basement, but evidence for this is not conclusive..Both metavolcanic greenstone-type lithologies and metasediments occur among the Birimian sequences, the former p作者: 巨頭 時(shí)間: 2025-3-31 10:57 作者: 卵石 時(shí)間: 2025-3-31 13:35
The Precambrian of West Africa — synthesis and reviewore than 2000 Ma of geological time.As there is good evidence that plate tectonics played a major part in the evolution of the Pan African domains, the resemblance to older terranes suggests that some form of plate tectonics has been active since the Archaean..The distribution of mineral deposits, h作者: GRIEF 時(shí)間: 2025-3-31 19:46 作者: BORE 時(shí)間: 2025-3-31 21:45
Infracambrian to Lower Palaeozoic basinsnset of sedimentation at around 1000 Ma ago, and products of a late Precambrian glaciation are recognised in both basins, marked by a distinctive association of tillite, limestone with barite, and chert..In the Volta Basin, the sediments can be correlated with rocks of the Togo belt, and the main ph作者: 柱廊 時(shí)間: 2025-4-1 02:44
Mesozoic to Tertiary basins — inland basins this phase did not begin to accumulate to any significant extent until the later Jurassic and Lower Cretaceous..A major marine transgression in the Upper Cretaceous filled large shallow basins in the non-cratonic (Pan African) areas of the continental interior. Sea level fluctuated and shorelines a作者: Confidential 時(shí)間: 2025-4-1 08:09
The Benue Trough and coastal basinsbably by later adjustments along faults in the underlying basement. The Bida Basin is a shallow unfaulted arm of the Benue Trough. The Benue Trough probably provided the major link between the Mediterranean (Tethys Ocean) and Gulf of Guinea via the lullmedden and Chad Basins, during Upper Cretaceous作者: Bother 時(shí)間: 2025-4-1 10:57
Economic potential of the younger sedimentary basinsces they contain. These are dominated by petroleum, but include also coal and uranium. There are large deposits of phosphate, an essential fertiliser mineral, and a host of industrial raw materials, including limestone for cement manufacture, kaolinitic clays, gypsum and salt. Metalliferous deposits
