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

被引:29
作者
ROPERCH, P
DUNCAN, RA
机构
[1] UNIV RENNES 1, GEOPHYS INTERNE LAB, ORSTOM, F-35042 RENNES, FRANCE
[2] OREGON STATE UNIV, COLL OCEANOG, CORVALLIS, OR 97331 USA
来源
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS | 1990年 / 95卷 / B3期
关键词
D O I
10.1029/JB095iB03p02713
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
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 part 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 beginning of the transition shows inclination steepening, consistent with a zonal model of geomagnetic field reversal based on an axial quadrupole. -from Authors
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页码:2713 / 2726
页数:14
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