The Roadside Geology of Namibia |
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Page 58
... Dykes form when the Earth's crust is under tension and vertical or sub- vertical fissures open up through which magma rises towards the Earth's surface . In flat lying bedded sedimentary rocks dykes cross - cut the bed- ding . Similar ...
... Dykes form when the Earth's crust is under tension and vertical or sub- vertical fissures open up through which magma rises towards the Earth's surface . In flat lying bedded sedimentary rocks dykes cross - cut the bed- ding . Similar ...
Page 59
... dykes and lava flows . In support of this assumption small and large subsided blocks of dolerite sills occur in the pipes of the Brukkaros Volcanic Field and in some of the pipes of the Gibeon Kimberlite Field . This relationship ...
... dykes and lava flows . In support of this assumption small and large subsided blocks of dolerite sills occur in the pipes of the Brukkaros Volcanic Field and in some of the pipes of the Gibeon Kimberlite Field . This relationship ...
Page 116
... dykes , as well as lampro- phyre dykes cut the granite phases of the complex . Syn - plutonic mafic dykes and mafic to intermediate magmatic enclaves within the granites demonstrate the bimodal character of magmatism . The outer ...
... dykes , as well as lampro- phyre dykes cut the granite phases of the complex . Syn - plutonic mafic dykes and mafic to intermediate magmatic enclaves within the granites demonstrate the bimodal character of magmatism . The outer ...
Contents
Namibia from the Archaean to the Cenozoic | 9 |
An overview of the Namibian mineralogy | 23 |
Present mineral production and exploration | 29 |
Copyright | |
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Common terms and phrases
amphibolites basalts Belt Brandberg Brukkaros calcrete Cenozoic Cenozoic sediments column for route composed conglomerate Craton Cretaceous crossed Damara Granite Damara Orogen Damara Sequence deposits diamond dolerite dolomite dunes Dwyka Formation dykes Erongo Escarpment Etendeka Etjo Fault Fish River Subgroup fossils Geological gneisses Grootfontein Hakos Group Henties Bay hills Hohewarte Complex Huab intruded Kalahari Basin Kalahari Group Karibib Karoo Sequence Keetmanshoop Kuibis Subgroup Kuiseb Formation Kunene landscape layers limestone Lüderitz Maltahöhe marble Mesoproterozoic metamorphic meteorite minerals Mulden Group Namaqualand Namaqualand Complex Namib Desert Namibia Nappe Naukluft northern Nosib Group occur Okahandja Omaruru Orange River Otavi Otavi Group Otjiwarongo outcrops Outjo overlain overlying PALAEOPROTEROZOIC pegmatites peneplain prominent quartz latite quartzite ridge road continues road cuts rocks sand sandstone schist Schwarzrand Subgroup seen Sesfontein shale sills Sinclair Sequence Spitzkuppe Swakop Group Swakopmund terrane underlain thrust Tsondab Tsumeb Tsumeb Subgroup turn-off Ugab underlain by Cenozoic valley volcanic Windhoek Zone