High-resolution estimate for the depositional duration of the Triassic Latemar Platform: A new magnetostratigraphy and magnetic susceptibility cyclostratigraphy from basinal sediments at Rio Sacuz, Italy
Article first published online: 30 APR 2013
©2013. American Geophysical Union. All Rights Reserved.
Geochemistry, Geophysics, Geosystems
Volume 14, Issue 4, pages 1245–1257, April 2013
How to Cite
2013), High-resolution estimate for the depositional duration of the Triassic Latemar Platform: A new magnetostratigraphy and magnetic susceptibility cyclostratigraphy from basinal sediments at Rio Sacuz, Italy, Geochem. Geophys. Geosyst., 14, 1245–1257, doi:10.1002/ggge.20094., , and (
- Issue published online: 23 MAY 2013
- Article first published online: 30 APR 2013
- Accepted manuscript online: 22 FEB 2013 12:56PM EST
- Manuscript Accepted: 12 FEB 2013
- Manuscript Revised: 1 FEB 2013
- Manuscript Received: 17 DEC 2012
- NSF. Grant Number: EAR-0823477
- Rio Sacuz;
 A new magnetostratigraphy and magnetic susceptibility cyclostratigraphy from Middle Triassic basinal sediments at Rio Sacuz, northern Italy, suggests a depositional duration of ~1 myr for most of the 670 m carbonate Latemar Platform, giving a high-resolution estimate for the duration for the Latemar's deposition. The new magnetostratigraphy from Rio Sacuz clarifies the ambiguities in a previous magnetostratigraphic study of the Latemar caused by lightning strike remagnetizations. Our Rio Sacuz study was unaffected by lightning. Using thermal demagnetization, we show a Normal-Reversed-Normal-Reversed sequence at the Latemar-correlated locality of Rio Sacuz. With a polarity interval duration of ~0.25–0.5 myr for the Middle Triassic, this gives a depositional duration of ~1–2 myr. Rock magnetic experiments show that the magnetic carrier is magnetite, suggesting a primary, depositional-age remanence. Measurement of magnetic susceptibility at 1 m intervals from Rio Sacuz reveals eight short eccentricity cycles (~95–125 kyr) bundled into slightly more than two 405 kyr long eccentricity cycles indicating a more precise duration for the Rio Sacuz section of 0.8 to 1 myr. The shorter depositional duration required by this study forces a sub-Milankovitch time scale of 1–2 kyr for the Latemar platform's meter-scale rhythmic bedding and provides strong evidence for nonorbitally driven climate change in the Middle Triassic.