Abstract
Abstract Ideas on the genesis and magmatectonic setting of three prominent Proterozoic, Grenvillian mafic dyke swarms in southern and central Sweden are presented. Two of the linear dyke swarms are associated with the Protogine Zone, a zone currently interpreted as a taphrogenic complex. The third dyke swarm represents very extensive mafic magmatism in central Sweden and forms large sheets and feeder dykes. The first two consist of the c. 1180 Ma old alkaline Protogine Zone Dolerite Group (PZDG) and the early Late Proterozoic, Late Grenvillian c. 930 Ma old Blekinge Dalarna Dolerite Group (BDDG), composed of olivine and quartz tholeiites. The third consists of the c. 1220 Ma old weakly alkaline to transitional Central Scandinavian Dolerite Group (CSDG). Petrogenetic modelling of the REE distribution patterns of the dyke swarms indicates partial batch melting followed by fractional crystallization. It is shown that the dyke swarms have been generated by low to moderate degrees of partial melting of a garne...
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