Geochronology of selected andesitic lavas from the King George Bay area (SE King George Island)
作者： Magdalena Pańczyk , Jerzy Nawrocki
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摘要: Volcanic rocks from the Lions Rump area, which are basement for a sequence of glaciomarine sediments Polonez Cove Formation, and lava flows Turret Point–Three Sisters Point area were sampled thermogeochronological palaeomagnetic investigations. Generally, andesitic lavas King George Bay consist mainly clinopyroxene (Ti-augite) orthopyroxene (hyperstene) plagioclase phenocrysts. The groundmass comprises mostly laths, clinopyroxene, titanomagnetite rare crystals. However, modal content, size, shape distribution phenocrysts variable specific each sample. Ar-Ar plateaus ages calculated very homogenous point to middle Eocene age (Lutetian, ~44.5 Ma). similar consistent volcanic that excluded thesis about separate tectonic evolution Warszawa Krakow blocks at least since Eocene. Three Sister younger emplaced during late (Bartonian/Priabonian: 37.3 ±0.4 Ma Priabonian: 35.35 ±0.15 Ma, respectively). results isotopic investigations with magnetic polarities indicating samples coeval lower part C20 polarity chron whereas sample can be correlated upper C17
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