A MAGNTEOTELLURIC DEEP-CRUSTAL STUDY IN SOUTH-CENTRAL PORTUGAL

被引：6

作者：

CORREIA, A

JONES, FW

DAWES, GK

HUTTON, VRS

机构：

[1] Dept. of Physics, Univ. of Alberta, Edmonton, T6G 2J1, Alberta

[2] Dept. de Físic, Universidade de Évora, Évora

[3] Dept. of Geology and Geophysics, Univ. of Edinburgh, Edinburgh

来源：

STUDIA GEOPHYSICA ET GEODAETICA | 1993年 / 37卷 / 04期

关键词：

D O I：

10.1007/BF01613580

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 geothermal anomaly reported to exist in southern Portugal and with heat flow density values as high as 160 mW/m2 was studied by the magneto-telluric method. The results of the magneto-telluric survey indicate that the study area is divided into several high electrical resistivity, deep-rooted blocks separated by low electrical resistivity zones. Those latter zones coincide with the main trends of the faults that cross the region. The high heat flow density values reported for the area are incompatible with the high electrical resistivities observed in the magneto-telluric survey. Furthermore, heat production values calculated for some of the rocks that crop out in the area of the geothermal anomaly cannot explain the high heat flow density values. Since no hydrothermal activity is known for the region and recent volcanism is absent, it is suggested that previous heat flow density calculations for the area covered by the magneto-telluric survey are overestimated.

引用

页码：331 / 344

页数：14

共 16 条

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