A paleomagnetic pole and estimated age for Lo-En Guyot, Republic of the Marshall Islands
Abstract
Marine magnetic data collected over Lo-En guyot in the Republic of the Marshall Islands during Moana Wave Cruise MW88-05 are inverted to estimate the best-fitting, least-squares, homogeneous magnetization for the guyot. The magnetization of Lo-En appears to differ from that of the spur ridge north-northwest of Lo-En. Over the shallowest part of the guyot the observed anomaly is of larger amplitude than calculated from the best-fitting model, which suggests that the guyot is more strongly or coherently magnetized in its shallow portions than at depth. Over the western part of the guyot the observed anomaly is of larger amplitude, whereas over the eastern part it is of smaller amplitude, than calculated from the best-fitting model, which also suggests that the guyot is more strongly or coherently magnetized in the western part than in the eastern part. Data importances, which measure how strongly different observations influence the values of the best-fitting parameters, tend to be highest on the portions of the survey over the steepest topography of the guyot. The paleomagnetic pole that we find for Lo-En, 64°N, 5°E, lies between the 65 Ma and 82 Ma reference poles for the Pacific plate, and comes closest to the Pacific apparent polar wander path at 74+11-29Ma, which is much younger than the ∼170-m.y.-old seafloor on which Lo-En lies.
- Publication:
-
Geophysical Monograph Series
- Pub Date:
- 1993
- DOI:
- 10.1029/GM077p0387
- Bibcode:
- 1993GMS....77..387B