PALAEOMAGNETISM OF MACARONESIAN INSULAR REGION - CAPE VERDE ISLANDS

被引:27
作者
WATKINS, ND
RICHARDS.A
MASON, RG
机构
[1] Department of Geology, Florida State University, Tallahassee, Florida
[2] Department of Geophysics, Imperial College, London
来源
GEOPHYSICAL JOURNAL OF THE ROYAL ASTRONOMICAL SOCIETY | 1968年 / 16卷 / 02期
关键词
D O I
10.1111/j.1365-246X.1968.tb00212.x
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
Palaeomagnetic pole positions have been determined for a collection of igneous rocks, comprising nearly five hundred samples, from the Cape Verde Islands of Santa Antao, Sao Vicente, Sao Nicolao and Sao Tiago. Limited data from the islands of Sal, Maio and Fogo are also presented. Stratigraphic control suggusts that the lavas are overwhelmingly Miocene in age on Sao Tiago and Sao Nicolao. Similarity in the palaeomagnetic pole positions indicates that Miocene lavas are also dominant on Santa Antao and Sao Vicente. Substantial areas within two of the islands are of reversed polarity only, suggesting either a rapid extrusion rate, or the existence of a long reversed polarity epoch during the Miocene period. The palaeomagnetic pole positions for each island are close to the present geographic pole, excluding the possibility of Post‐Miocene differential crustal spreading (or rotation about a vertical axis) in this part of the Atlantic. The palaeomagnetic pole position for the entire survey is consistent with the Miocene geographic pole being removed from, but close to, the present geographic pole; and is in harmony with the European polar wandering curve. Copyright © 1968, Wiley Blackwell. All rights reserved
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页码:119 / &
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