Lithostratigraphy of the Bumbeni Complex and its associated subdivisions, South Africa
| Autor: | M. Ncume, N. Hicks, L. Hoyer, J.W. Bristow, G.A. Botha |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | South African Journal of Geology. 125:225-243 |
| ISSN: | 1996-8590 1012-0750 |
| Popis: | The Bumbeni Complex represents an Early Cretaceous volcanic complex that developed at the southern termination of the Lebombo mountain range in northern KwaZulu-Natal, South Africa. The volcano-sedimentary complex intrudes and disconformably overlies the Lebombo Group of the Karoo Large Igneous Province. The volcano-stratigraphy is defined by an assemblage of volcanic and volcaniclastic rocks as well as late stage quartz-syenite intrusions. Based on current geological and geophysical studies the complex is considered to represent the remnants of a collapsed cauldron structure. The stratigraphic succession is intricate and laterally discontinuous, comprising mafic and felsic lava flows, welded and non-welded tuffs, ignimbrites, lahar deposits, rhyolite domes and dykes and coarse-grained syenitic rocks. Rhyolite dome formation and collapse, and associated plinian eruptions and column collapse, were largely responsible for the variety of volcaniclastic rocks, including classic air-fall tuff deposits. The complex forms part of a northeast trending volcanic basement lineament known as the Bumbeni Ridge defined by aeromagnetic data. |
| Databáze: | OpenAIRE |
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