Palaeomagnetism and magnetic–polarity zonation in some Oligocene volcanic rocks of the San Juan Mountains, south–western Colorado
Links
- More information: Publisher Index Page (via DOI)
- Open Access Version: Publisher Index Page
- Download citation as: RIS | Dublin Core
Abstract
Palaeomagnetic results have been obtained from thirty sites in intrusive and extrusive rocks of Oligocene age from the San Juan Mountains, south-western Colorado. All specimens from each site were subjected to af demagnetization, and the reliability of each site determined. Twenty-three sites gave reliable results. Because five sites from the thick intracaldera part of the La Jara Canyon Member of the Treasure Mountain Tuff appear to have become magnetized during the same small interval of geological time, their results were combined and their mean pole and direction used in the final calculations. The eighteen remaining reliable sites yielded an average Oligocene palaeomagnetic pole at 85·6° N and 298·0° E (δp = 8°, δm = 11°, k = 24·1). A stratigraphic sequence is given for the major San Juan ash-flow sheets and selected additional units with their corresponding magnetic polarities and mean K-Ar ages.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Palaeomagnetism and magnetic–polarity zonation in some Oligocene volcanic rocks of the San Juan Mountains, south–western Colorado |
| Series title | Geophysical Journal International |
| DOI | 10.1111/j.1365-246X.1974.tb01242.x |
| Volume | 37 |
| Issue | 2 |
| Year Published | 1974 |
| Language | English |
| Publisher | Oxford Academic |
| Contributing office(s) | Volcano Science Center |
| Description | 10 p. |
| First page | 323 |
| Last page | 332 |
| Country | United States |
| State | Colorado |
| Other Geospatial | San Juan Mountains |
| Google Analytic Metrics | Metrics page |