+Gabbroic, syenogabbroic and syenitic cumulates of the Tugtutoq Younger giant dyke complex, south Greenland.

Abstract

The Tugtutoq Younger Giant Dyke Complex comprises an interconnecting suite of dykes, individually up to 800 m broad, traceable for some 145 km through a Proterozoic granitic terrain. The intrusion is thought to have resulted from one major influx of high-alumina mildly alkaline basalt and hawaiite magma at approx 1150 Ma. Among the features present are modally graded layering, isomodal layering, intermittent rhythmic layering, crossbedding and magmatic erosion channels, including slump structures, slump breccias, down-dip thickening of mafic layers and high-temperature (annealed) faults. Cryptic and phase layering is also evident.- from Author