A geomagnetic polarity timescale for the Carboniferous
作者： Mark W. Hounslow
关键词: Paleontology 、 Polarity (physics) 、 Viséan 、 Pennsylvanian 、 Serpukhovian 、 Kasimovian 、 Earth's magnetic field 、 Carboniferous 、 Geology 、 Tournaisian
摘要: The geomagnetic polarity pattern for the Carboniferous is incompletely known, but with best resolved parts in Serpukhovian and Bashkirian. Hence, data from both igneous sedimentary units are also used an additional bias evaluation. In Tournaisian to mid Visean interval mainly derived palaeopole-type palaeomagnetic studies, allowing identification of chrons. Seven chrons exist Mississippian (MI1nB MI4nB) 33 conventional magnetochrons submagnetochrons (MI4r MI9r). Moscovian Gzhelian magnetostratigraphic studies Donets Basin southern Urals. Dispute about reliability these ill-founded, since assessment supporting suggests that datasets currently provide magnetic through Pennsylvanian. Polarity indicates a normal zone Kasimovian. Pennsylvanian there 27 (PE1n CI1r) one chron (PE8nB). Kiaman Superchron begins Bashkirian, clear indicating brief within Superchron. magnetochron timescale calibrated using 31 U-Pb zircon dates quantitative Bayesian-based age-scaling procedure.
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