O wieku paleomagnetycznym mineralizacji miedziowej, uranowej i cynkowo-ołowiowej w Polsce określanym metodą porównania charakterystycznych namagnesowań z krzywą referencyjną pozornej wędrówki bieguna paleomagnetycznego
Abstract
On the paleomagnetic age of copper, uranium and zinc-lead mineralization in Poland, determined by comparison of characteristic magnetizations with the reference apparent polar wander path.
A b s t r a c t. Paleomagnetic poles obtained earlier from mineralization zones of Kupferschiefer (hematitic Rote Fäule, North Sudetic Basin), uranium-bearing rocks (Kletno abandoned mine, Sudetes) and zinc-lead ores (Cracow–Silesian district) were compared with the newest version of the apparent polar wander path (APWP) for stable Europe, deprived of paleoinclination error. Paleomagnetic data exclude age of the Rote Fäule younger than ca. 250 Ma. The pole matches the new APWP in the interval enclosed between ca. 250 Ma and ca. 258 Ma (age of the host rocks) after the correction of original data of about 10–15 on inclination error. It means that hematitic mineralization of the Rote Fäule was developed before compaction of sediments. The paleomagnetic pole isolated from the zinc-lead mineralization zone of the Carcow–Silesian district cannot be used anymore as the basic argument for its Tertiary age. Its large oval of confidence overlaps the Early Cretaceous segment of the reference APWP (100–120 Ma) as well. The Early Cretaceous (120–140 Ma) paleomagnetic age is the most probable in the case of uranium-bearing mineralization from the Kletno abandoned mine.
A b s t r a c t. Paleomagnetic poles obtained earlier from mineralization zones of Kupferschiefer (hematitic Rote Fäule, North Sudetic Basin), uranium-bearing rocks (Kletno abandoned mine, Sudetes) and zinc-lead ores (Cracow–Silesian district) were compared with the newest version of the apparent polar wander path (APWP) for stable Europe, deprived of paleoinclination error. Paleomagnetic data exclude age of the Rote Fäule younger than ca. 250 Ma. The pole matches the new APWP in the interval enclosed between ca. 250 Ma and ca. 258 Ma (age of the host rocks) after the correction of original data of about 10–15 on inclination error. It means that hematitic mineralization of the Rote Fäule was developed before compaction of sediments. The paleomagnetic pole isolated from the zinc-lead mineralization zone of the Carcow–Silesian district cannot be used anymore as the basic argument for its Tertiary age. Its large oval of confidence overlaps the Early Cretaceous segment of the reference APWP (100–120 Ma) as well. The Early Cretaceous (120–140 Ma) paleomagnetic age is the most probable in the case of uranium-bearing mineralization from the Kletno abandoned mine.