The Okavango giant mafic dyke swarm (NE Botswana): its structural significance within the Karoo Large Igneous Province

The Okavango giant mafic dyke swarm (NE Botswana): its structural significance within the Karoo Large Igneous Province

The structural organization of a giant mafic dyke swarm, the Okavango complex, in the northern Karoo Large Igneous Province (LIP) of NE Botswana is detailed. This N110°E-oriented dyke swarm extends for 1500 km with a maximum width of 100 km through Archaean basement terranes and Permo-Jurassic sedim...

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Veröffentlicht in:Journal of structural geology 2005-01, Vol.27 (12), p.2234-2255
Hauptverfasser: Le Gall, Bernard, Tshoso, Gomotsang, Dyment, Jérôme, Basira Kampunzu, Ali, Jourdan, Fred, Féraud, Gilbert, Bertrand, Hervé, Aubourg, Charly, Vétel, William
Format: Artikel
Sprache:eng
Schlagworte:
Botswana
Earth Sciences
Giant mafic dyke swarm
Karoo Large Igneous Province
Okavango
Sciences of the Universe
Structure
Tectonics
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Zusammenfassung:The structural organization of a giant mafic dyke swarm, the Okavango complex, in the northern Karoo Large Igneous Province (LIP) of NE Botswana is detailed. This N110°E-oriented dyke swarm extends for 1500 km with a maximum width of 100 km through Archaean basement terranes and Permo-Jurassic sedimentary sequences. The cornerstone of the study is the quantitative analysis of N>170 (exposed) and N>420 (detected by ground magnetics) dykes evidenced on a ca. 80-km-long section lying in crystalline host-rocks, at high-angle to the densest zone of the swarm (Shashe area). Individual dykes are generally sub-vertical and parallel to the entire swarm. Statistical analysis of width data indicates anomalous dyke frequency (few data
ISSN:0191-8141
1873-1201
DOI:10.1016/j.jsg.2005.07.004