Magnetostratigraphic Data on the Upper Cretaceous of Tuarkyr (Turkmenistan) and Their Implications for the General Paleomagnetic Time Scaleстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The Cenomanian–Campanian deposits of Tuarkyr (northwestern Turkmenistan) are studied magnetostratigraphically with a reliable paleontological control. Turonian–Campanian rocks possess a high paleomagnetic stability. The existence of a reversed polarity subzone in the middle Cenomanian and several reversals in the Turonian–Coniacian is confirmed. The Santonian–Campanian of the section is dominated by a reversed polarity. The results of the study point to an intricate magnetic zonation of the Cenomanian–Campanian and, together with the analysis of data on the Upper Cretaceous of other regions, suggest the necessity of revising the Cenomanian–Campanian interval of the magnetostratigraphic time scale, which has been traditionally considered as an interval of a predominantly normal polarity. New data on the Cenomanian–Campanian geomagnetic field regime also suggest that geodynamic models relating the epoch of the quiet Cretaceous field to various geological events should possibly be reexamined.