Continuous record of geomagnetic field intensity between 4.7 and 2.7 Ma from downhole measurements

被引：20

作者：

Thibal, J ^{[1
]}

Pozzi, JP ^{[1
]}

Barthes, V ^{[1
]}

Dubuisson, G ^{[1
]}

机构：

[1] CEN,LAB ELECTR TECHNOL & INSTRUMENTAT,F-38041 GRENOBLE,FRANCE

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 1995年 / 136卷 / 3-4期

关键词：

D O I：

10.1016/0012-821X(95)00173-A

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

A continuous record of the geomagnetic field intensity from 4.7 to 2.7 Ma has been obtained, together with a precise magnetostratigraphy, from downhole magnetic measurements at Site 884 of ODP Leg 145 in the North Pacific. The record confirms the saw-tooth pattern of geomagnetic field intensity proposed by Valet et Meynadier [10]. Reversals are characterized by a steep intensity decrease followed by a quick regeneration. Over each polarity interval, rapid variations are superimposed over a progressive decrease in the mean intensity. We find that the duration of each polarity interval is inversely proportional to the mean rate of decrease in the field intensity over this period, and thus this duration seems to be pre-determined.

引用

页码：541 / 550

页数：10

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