Cyclostratigraphic calibration of cretaceous magnetic polarity events (Cismon, Southern Alps, Italy) |
| |
| Authors: | Helmut Mayer |
| |
| Institution: | (1) Institut für Geologie und Paläontologie, Eberhard-Karls-Universität Tübingen, Germany;(2) U.S. Geological Survey, Denver, Colorado |
| |
| Abstract: | In an introductory section the problems of constructing a geologic time scale and the role of magnetic reversals and Milankovitch cycles in geochronology are outlined. Results of a detailed cyclostratigraphic and magnetostratigraphic study of the Valanginian/Hauterivian part of the pelagic limestone section at Cismon in the Southern Alps are presented and used in conjunction to estimate the duration of magnetic subchrons between CM10N and CM8. The new estimates are shorter than in most published time scales by a factor of two to three. More research along these lines may make a revision of the Early Cretaceous time scale necessary. |
| |
| Keywords: | geologic time scale magnetostratigraphy Milankovitch cycles time-series analysis Valanginian/Hauterivian Maiolica/Biancone Formation |
| 本文献已被 SpringerLink 等数据库收录！ |
