West of Sarand?del Y?Shear Zone the R�o de la Plata Craton is intruded by the Florida dyke swarm.
12.
Intrusive events and dyke swarm emplacement in Karoo Large Igneous Province occurred during 183 174 Ma in the Mesozoic era.
13.
Jurassic dykes found in the dyke swarms are mostly composed of dolerite, containing clinopyroxene, plagioclase, and olivine.
14.
The flow of magma and structure of rocks at the time of Karoo magmatism can be observed by the orientation of dyke swarm.
15.
The exact timing is uncertain, but associated folds within the Devonian are cut by members of the Late Carboniferous to Early Permian dyke swarm.
16.
So magma flowing to Okavango Dyke Swarm is sourced from lateral side from the Karoo Triple junction, rather than an uprising active mantle plume head.
17.
Despite having some characteristics similar to those of igneous rocks formed near subduction zones, the Florida dyke swarm rocks are unlikely to have formed in such environment.
18.
Mawenzi forms a horseshoe shaped ridge with pinnacles and ridges opening to the northeast which has a tower like shape resulting from deep erosion and a mafic dyke swarm.
19.
The linear dyke swarms often have a high proportion of dykes relative to country rocks, particularly when the width of the linear field is less than 100 km.
20.
The dyke swarm could extend for such a large area because of the pre-existing basement brittle fracture networks, instead of stress formed by the plate movement.
