Updated tectonic terrane boundaries of Botswana determined from gravity and aeromagnetic data

Chikondi Chisenga*, Jianguo Yan, I. Fadel, M. van der Meijde, Estella A. Atekwana

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
47 Downloads (Pure)

Abstract

We used existing high-resolution gravity and aeromagnetic data to map the crustal units underneath Botswana. The thick sedimentary cover in this region has always been a challenge to understand the geological and tectonic configuration of unexposed crustal terranes using traditional geological methods. We utilized a standard physical mapping technique to convert previously obtained gravity and aeromagnetic data into apparent density and magnetic susceptibility maps, respectively, of the crustal tectonic terranes. Then, the derived maps were fused into a single apparent physical map to facilitate its geotectonic interpretation. The results showed that most of the tectonic boundaries were inaccurately mapped due to limited availability of high-resolution geophysical information. Moreover, we found that some terranes were missing from the current tectonic map. We used the apparent physical property map and the basement rocks information from literature to significantly update the tectonic map of Botswana, which shows the spatial extent of the geological units beneath the Kalahari sedimentary cover. The new map gives an insight into the geodynamics of Botswana crust.
Original languageEnglish
Pages (from-to)919-933
Number of pages15
JournalEpisodes
Volume43
Issue number4
DOIs
Publication statusPublished - 1 Dec 2020

Keywords

  • Gravity
  • Magnetic
  • Earth Structure
  • Earth's Crust
  • ITC-ISI-JOURNAL-ARTICLE

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