Dyke Architecture, Mineral Layering, and Magmatic Convection; New Perspectives From the Younger Giant Dyke Complex, S Greenland

Igneous sheet intrusions are a fundamental component of volcano plumbing systems. Identifying how intrusion emplacement and geometry controls later magmatic processes is critical to understanding the distribution volcanic eruptions magma-related ore deposits. Using Younger Giant Dyke Complex (YGDC), Mesoproterozoic suite large (<800 m wide) mafic dykes in southern Greenland, we assess influence on subsequent magma flow mush evolution. Through structural mapping, petrographic observations, anisotropy magnetic susceptibility fabric analyses, show that YGDC was emplaced as series individual dyke segments, which following coalescence into remained largely isolated during their evidence for liquid-rich growth cumulus phases, concentric fabrics, detailed study layered zones within YGDC, infer convection occurred cores each element. We particularly relate layering hydrodynamic sorting at magma-mush boundary toward base cell. Overall, our work demonstrates initial can constrain patterns affect crystallization regimes.