Low temperature thermal history of eastern Ireland: effects of fluid flow

摘要: Abstract A reconnaissance apatite fission track study was undertaken in eastern Ireland to evaluate the low temperature thermal history of Palaeozoic basement rocks outcropping adjacent Irish Sea basin. On a sampling transect across lapetus suture zone distributions single grain ages and lengths indicate cooling after maximum palaeotemperatures between 80 100–110°C at various times during Early Tertiary (about 30–45 Ma). Although significant component uplift erosion is inferred from geological observations, are interpreted as principally due heat advection by gravity-driven groundwater flow following about 60 Ma. This phase fluid produced localized remagnetization overlying Carboniferous limestones north Co. Dublin. Limited indicates extreme local heterogeneity age, also characteristic results northern England. Thus requires an annealing control, independent sample's history, suggested be individual crystal uranium content indirectly effects flow.