Insights of dyke emplacement mechanics from detailed 3D dyke thickness datasets

Janine Kavanagh, Stephen Sparks

Research output: Contribution to journalArticleResearchpeer-review

56 Citations (Scopus)

Abstract

Dyke thickness datasets offer new insights into the detailed 3D geometry of dyke swarms and an exceptional opportunity to evaluate theoretical emplacement models. The Swartruggens kimberlite dyke swarm extends over 7 km along strike and intrudes a dolerite, quartzite, shale and andesitic lava succession. The Star kimberlite dykes cut shales and sandstones, intersect a large dolerite sill and extend 15 km along strike. Both dyke swarms comprise anastomosing en echelon segments, each several hundred metres long. In total 1532 Swartruggens dyke thickness measurements were taken, to 750 m below the surface over a 250 m depth range, and 3354 Star dyke thickness measurements were taken over a 520 m depth range. The Swartruggens dyke thicknesses are 0.05-1.95 m (mean 0.64 m), whereas the Star kimberlites range from
Original languageEnglish
Pages (from-to)965 - 978
Number of pages14
JournalJournal of the Geological Society
Volume168
Issue number4
DOIs
Publication statusPublished - 2011
Externally publishedYes

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