Late Miocene remagnetization within the internal sector of the Northern Apennines, Italy
Tectonophysics
By: I.W. Aiello, J.T. Hagstrum, and G. Principi
Links
- More information: Publisher Index Page (via DOI)
- Open Access Version: External Repository
- Download citation as: RIS | Dublin Core
Abstract
Paleomagnetic and geologic evidence indicates that Upper Jurassic radiolarian cherts of both the Tuscan Cherts Formation (continental margin, Tuscan Units) and the Monte Alpe Cherts Formation (oceanic crust, Ligurian Units) were remagnetized during Miocene orogenesis of the Northern Apennines of Italy. Characteristic overprint magnetizations with reversed polarities have been found over a large area within the internal sector of the Northern Apennines, including eastern Liguria, Elba Island and the Thyrrenian margin, and west of the Middle Tuscan Ridge. The reversed-polarity overprint (average direction: D=177??, I=-52??, ??95=15??) was most likely acquired during Late Miocene uplift and denudation of the orogenic chain, and thermochemical remagnetization was a probable consequence of increased circulation of orogenic fluids. Similarly, mostly reversed-polarity directions of magnetization have been found by other workers in overlying post-orogenic Messinian sediments (D=177??, I=-57??, ??95=3??), which show little counterclockwise (CCW) vertical-axis rotation with respect to stable Europe (-8??5??). The Monte Alpe Cherts sampled at sites in the external sector of the Northern Apennines, close to major tectonic features, have normal- polarity overprint directions with in situ W-SW declinations. Since the overlying post-orogenic Messinian sediments have not been substantially rotated about vertical axes, the evidence points to an earlier,pre-Late Miocene remagnetization in the external parts of the orogenic chain. ?? 2004 Elsevier B.V. All rights reserved.
Suggested Citation
Aiello, I., Hagstrum, J., and Principi, G., 2004, Late Miocene remagnetization within the internal sector of the Northern Apennines, Italy: Tectonophysics, v. 383, no. 1-2, p. 1-14, https://doi.org/10.1016/j.tecto.2004.02.001.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Late Miocene remagnetization within the internal sector of the Northern Apennines, Italy |
| Series title | Tectonophysics |
| DOI | 10.1016/j.tecto.2004.02.001 |
| Volume | 383 |
| Issue | 1-2 |
| Year Published | 2004 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Tectonophysics |
| First page | 1 |
| Last page | 14 |