Stratigraphic and Spatial Extent of HALIP Magmatism in Central Spitsbergen

Rapid extensive magmatism may have a profound effect on global climate by liberating and releasing greenhouse gases to the atmosphere through contact metamorphism of lithologically heterogeneous host rocks degassing magma associated lava flows. The high Arctic Archipelago Svalbard offers accessible, superbly exposed outcrops revealing Early Cretaceous with High Large Igneous Province (HALIP). In this contribution, we investigate onshore-offshore intrusive complex central Spitsbergen formed due HALIP activity, that is, Diabasodden Suite. This is most “data-rich” part past petroleum exploration research drilling. area, predominantly dolerite intrusions are emplaced in range ranging from Permian carbonate-dominated successions organic-rich shale-dominated Middle Triassic Late Jurassic-Early age. Two hundred sixty five individual igneous intrusions, covering 72 km2, onshore study area. equates approximately 0.14–2.5 km3 magma. addition, subsurface characterization using borehole, seismic magnetic data indicates an area additional ca. 3,000 km2 affected (magma volume 3.2–195.2 km3). Wireline logs boreholes characterize both aureoles. Aureoles very low resistivity indicate occurrence shales suggesting fluid circulation de-gassing. forms foundation for quantifying HALIP-related data-poorer parts Svalbard, other circum-Arctic basins.