Igneous sheet-complexes transport magma through the crust, but most studies have focused on single segments of magma-transport-system or low resolution. In Jameson Land Basin in East Greenland, reflection-seismic data and extensive outcrops give unparalleled constraints mafic intrusions down to 15 km. This dataset shows how sill-complexes develop is transported from mantle sedimentary basins. T...

Mafic dykes of lamprophyric affinity cropping out along the coastal area Montevideo city are described. These trend N75º-85º and crosscut 2.1 Ga Paleoproterozoic metamorphic units Rio de la Plata craton. They show mainly porphyritic textures with phlogopite clinopyroxene macrocrysts in a groundmass composed carbonates, phlogopite, augite, feldspathoids. Ocellar structures filled by leucite, car...

We have reappraised the age and composition of mid-Proterozoic Häme dyke swarm in southern Finland. The dominant trend dykes this is NW to WNW. Petrographic observations geochemical data indicate uniform, tholeiitic low- Mg parental magmas for all dykes. Nevertheless, variability incompatible trace element ratios, such as Zr/Y La/Nb, provides evidence changing mantle melting conditions variable...

Diapirism has been discredited as a transport mechanism for magmas partly because diapirs seem to be unable to bring magmas to shallow crustal levels (< 10 km) and partly because recent developments in the theory of dyke propagation have shown that sufficiently wide dykes are able to efficiently transport felsic magmas through the crust. However, it is still unclear how felsic dykes grow to wid...