SEISMIC EVIDENCE FOR A LOW-VISCOSITY LOWER CRUST BENEATH THE CONTINENTAL DEEP DRILLING LOCATION, OBERPFALZ, GERMANY

被引：0
|
作者：
WEVER, T
TRAPPE, H
机构：
[1] UNIV KIEL, INST GEOPHYS, W-2300 KIEL 1, GERMANY
[2] BEB ERDGAS & ERDOL, W-3000 HANNOVER 51, GERMANY
来源：
PHYSICS OF THE EARTH AND PLANETARY INTERIORS | 1992年 / 69卷 / 3-4期
关键词：
D O I：
10.1016/0031-9201(92)90144-K
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 network of six deep seismic reflection profiles was recorded in the Oberpfalz as part of the pre-site investigations for the German deep drilling programme. In addition, this network is crossed by a longer regional profile. A striking observation is the highly variable reflectivity of the lower crystalline crust. Based on the relationship between (temperature-dependent) viscosity and crustal reflectivity it seems possible to relate the changes encountered here to the tectono-thermal regime. We propose that processes forming the Eger Graben also thermally influcnce the crust beneath the Oberpfalz. These mechanisms should have a considerable impact on the maximum depth of the deep borehole. The results of the pilot hole give strong support to our interpretation: the temperatures are higher than the maximum estimates from near-surface heat flow determinations and the maximum depth for the borehole has been reduced from 14 to 10 km.
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页码：257 / 262
页数：6
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