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.
引用
收藏
页码：257 / 262
页数：6
相关论文
共 27 条
  • [1] BROWN L, 1986, REFLECTION SEISMOLOG, P107
  • [2] Bultemann HW, 1979, Z DT GEOL GES, V130, P575
  • [3] Burkhardt H., 1989, GERMAN CONTINENTAL D, P433, DOI [10.1007/978-3-642-74588-1_ 18, DOI 10.1007/978-3-642-74588-1_18]
  • [4] Dohr G., 1957, GEOL RUNDSCH, V46, P17, DOI DOI 10.1007/BF01802879
  • [5] ermak V., 1979, TERRESTRIAL HEAT FLO, P152, DOI [10.1007/978-3-642-95357-6_14, DOI 10.1007/978-3-642-95357-6_14]
  • [6] SEISMIC IMAGING OF MAJOR TECTONIC FEATURES IN THE CRUST OF PHANEROZOIC EASTERN AUSTRALIA
    FINLAYSON, DM
    WAKEDYSTER, KD
    LEVEN, JH
    JOHNSTONE, DW
    MURRAY, CG
    HARRINGTON, HJ
    KORSCH, RJ
    WELLMAN, P
    [J]. TECTONOPHYSICS, 1990, 173 (1-4) : 211 - &
  • [7] GEOPHYSICAL DIFFERENCES IN THE LITHOSPHERE BETWEEN PHANEROZOIC AND PRECAMBRIAN AUSTRALIA
    FINLAYSON, DM
    [J]. TECTONOPHYSICS, 1982, 84 (2-4) : 287 - 312
  • [8] GRIESSHABER E, 1987, TERRA COGNITA, V7, P165
  • [9] HENNINGSEN D, 1981, EINFUHRUNG GEOLOGIE
  • [10] KLEMPERER SL, 1986, GEOL SOC AM BULL, V97, P603, DOI 10.1130/0016-7606(1986)97<603:TMITNB>2.0.CO
123