Geomagnetic polarity epochs: Nunivak Island, Alaska
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Abstract
New paleomagnetic and potassium-argon dating measurements have been made of basalt flows from Nunivak Island, Alaska, with the following results. (1) The best estimate of the age of the Brunhes/Matuyama polarity epoch boundary is found to be 0.694 m.y. (2) The best estimate of the age of the Gauss/Gilbert boundary is 3.32 m.y. (3) Three normally magnetized flows with ages from 0.93 to 0.88 m.y. are in accord with previous estimates of the age and duration of the Jaramillo normal event. (4) One normally magnetized flow with an age of 1.65 ± 0.09 m.y. supplies additional evidence for the Gilsá normal event. (5) Two new normal events are identified within the Gilbert reversed epoch, the “Cochiti normal event” with an age of 3.7 m.y. and the “Nunivak normal event” with an age of 4.1 m.y.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Geomagnetic polarity epochs: Nunivak Island, Alaska |
| Series title | Earth and Planetary Science Letters |
| DOI | 10.1016/0012-821X(67)90031-3 |
| Volume | 3 |
| Issue | C |
| Year Published | 1967 |
| Language | English |
| Publisher | Elsevier |
| Description | 5 p. |
| First page | 173 |
| Last page | 177 |
| Country | United States |
| State | Alaska |
| Other Geospatial | Nunivak Island |
| Google Analytic Metrics | Metrics page |