Abstract
A total of 505 paleomagnetic samples were collected from 65 sites (volcanic flows) of the Patagonian Plateau basalts at four locations in southern Chile and Argentina. K/Ar analyses indicate that 38 flows from the two locations form a Late Cretaceous group (64-79 Ma), while the remaining 27 flows are Eocene in age (42-56 Ma). Progressive demagnetization indicates that a characteristic remanent magnetization (ChRM) has been successfully isolated from 59 flows. Rock-magnetic properties and analysis of ChRM directions within and between sites allow the secure inference that the ChRM is a thermoremanent magnetization acquired during original cooling. Contrary to previous indications, the South American apparent polar wander path does not reach the present rotation axis until after Late Cretaceous time. -from Authors
| Original language | English |
|---|---|
| Pages (from-to) | 6023-6034 |
| Number of pages | 12 |
| Journal | Journal of Geophysical Research |
| Volume | 96 |
| Issue number | B4 |
| DOIs | |
| Publication status | Published - 1991 |
ASJC Scopus subject areas
- Geophysics
- Forestry
- Oceanography
- Aquatic Science
- Ecology
- Water Science and Technology
- Soil Science
- Geochemistry and Petrology
- Earth-Surface Processes
- Atmospheric Science
- Earth and Planetary Sciences (miscellaneous)
- Space and Planetary Science
- Palaeontology