Dyke swarms in Brazil, Angola, eastern Paraguay, and Namibia, however, suggest the LIP originally covered a much larger area and also indicate failed rifts in all these areas.
32.
The rock fabrics at craton boundaries and basement rock control the orientation of Okavango dyke swarm The Okavango dyke swarm inherited the Proterozoic fractures in association with the previous Proterozoic dyke emplacement event.
33.
The rock fabrics at craton boundaries and basement rock control the orientation of Okavango dyke swarm The Okavango dyke swarm inherited the Proterozoic fractures in association with the previous Proterozoic dyke emplacement event.
34.
The rocks of the Florida dyke swarm have been quarried since the 1960s and are used in the construction industry as black dimension stone of very high quality, being marketed as " black granite ".
35.
A number of dykes in the Okavango dyke swarm are dated as Proterozoic age ( mainly ~ 884 Ma ), which indicates the orientation of the dyke swarm was determined before the occurrence of Karoo magmatism.
36.
A number of dykes in the Okavango dyke swarm are dated as Proterozoic age ( mainly ~ 884 Ma ), which indicates the orientation of the dyke swarm was determined before the occurrence of Karoo magmatism.
37.
A number of features have been ascribed to late stage extensional tectonics including a widespread NE-SW trending dyke swarm, NE-SW trending normal faults and NW-SE trending sedimentary basins filled with post-orogenic molasse deposits
38.
Secondly, large ultramafic intrusions are rarely sealed systems and may be subject to regular injections of fresh, primitive magma, or to loss of volume due to further upward migration of the magma ( possibly to feed volcanic vents or dyke swarms ).
39.
Despite intense reworking during the Caledonian orogeny in some areas, three major belts can be recognised in the Proterozoic rocks of Norway, the Neoproterozoic and Mesoproterozoic Gothian and tectonic extension and continental magmatism led to the formation of Kattsund-Koster dyke swarm in southeastern Norway.
40.
The fragmentation corresponded with widespread anorogenic magmatic activity, forming anorthosite-mangerite-charnockite-granite ( AMCG ) suites in North America, Baltica, Amazonia, and North China, and continued until the final breakup of the supercontinent at about 1.3 1.2 Ga, marked by the emplacement of the 1.27 Ga Sudbury mafic dyke swarms in North America.
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