Records of geomagnetic reversals from volcanic islands of French Polynesia 1. Paleomagnetic study of a polarity transition in a lava sequence from the island of Huahine Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/qf85nc647

copyrighted by American Geophysical Union

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • We report the behavior of the earth's magnetic field for a transition recorded in lavas at the volcanic island of Huahine in French Polynesia, south-central Pacific Ocean. Detailed intermediate fields are observed that record an apparent N-N excursion. The available K-Ar ages indicate that most volcanic rocks of the southern pan of Huahine erupted at a time close to the Kaena subchron. Gaps in the paleomagnetic sampling or a hiatus in the volcanic activity during the Kaena event may have led to the partial record of a complete polarity transition, missing the fully reversed state. Nevertheless, numerous flows have recorded intermediate fields that somewhat constrain reversal models. The low intensities of magnetization associated with the intermediate directions suggest that the transitional field has mainly low intensities. The beginning of the transition shows inclination steepening, consistent with a zonal model of geomagnetic field reversal based on an axial quadrupole. Large deviations from a north-south planar distribution of the intermediate directions show that non axisymmetrical nondipolar fields are important in the middle of the transition.
Resource Type
Date Available
Date Issued
Citation
  • Duncan, R. A., and Roperch P (1990) Records of geomagnetic reversals from volcanic islands of French Polynesia 1. Paleomagnetic study of a polarity transition in a lava sequence from the island of Huahine. J. Geophys. Res., 95, B3, 2713-2726.
Series
Rights Statement
Publisher
Language
Replaces
Additional Information
  • description.provenance : Submitted by Mary Phan (mpscanner@gmail.com) on 2010-07-30T18:16:39Z No. of bitstreams: 1 Poperch_and_Duncan_JGR_1990.pdf: 1123875 bytes, checksum: c7d0993f196f666ac1641523f5deabce (MD5)
  • description.provenance : Approved for entry into archive by Sue Kunda(sue.kunda@oregonstate.edu) on 2010-08-04T23:33:59Z (GMT) No. of bitstreams: 1 Poperch_and_Duncan_JGR_1990.pdf: 1123875 bytes, checksum: c7d0993f196f666ac1641523f5deabce (MD5)
  • description.provenance : Made available in DSpace on 2010-08-04T23:33:59Z (GMT). No. of bitstreams: 1 Poperch_and_Duncan_JGR_1990.pdf: 1123875 bytes, checksum: c7d0993f196f666ac1641523f5deabce (MD5) Previous issue date: 1990-03-10

Relationships

In Administrative Set:
Last modified: 07/24/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items