Perturbation of the KAr age system in the Cleveland dyke, U.K.: Evidence of an Early Eocene age for barite mineralisation in the Magnesian Limestone of County Durham
作者： John G. Mitchell , Peter N. Rands , Peter R. Ineson
DOI: 10.1016/0168-9622(89)90006-7
关键词: Cleveland Dyke 、 Geology 、 Perturbation (geology) 、 Absolute dating 、 Structural basin 、 Magnesian Limestone 、 Geochemistry 、 Royaume uni 、 Igneous rock 、 Paleogene
摘要: Abstract Conventional K-Ar ages (34 in all) measured along a 300-km-long section of the Lower Tertiary Cleveland-Armathwaite dyke, North Atlantic Igneous Province, U.K., range from 43.8 to 62.6 Ma. Interpreted by model single-stage K/Ar exchange, best estimates for emplacement age and exchange are 59.3 ± 2.0 52.3–50.6 Ma, respectively. K Ba contents correlated show greatest enrichment where dyke intersects Lunedale-Butterknowle Fault system (at boundary between Alston Block adjacent basin). A seismic pumping mechanism, driven Eocene movements on this fault system, is argued be responsible transporting waters near surface. The post-Permian barite mineralisation occurring elsewhere may therefore be, at least part, age.
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