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Geophysical and geochemical constraints on the geodynamic origin of the Vrancea Seismogenic Zone Romania.

机译：罗马尼亚Vrancea地震发生带地球动力学成因的地球物理和地球化学约束。

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摘要

The Vrancea Seismogenic Zone (VSZ) of Romania is a steeply NW-dipping volume (30 x 70 x 200 km) of intermediate-depth seismicity in the upper mantle beneath the bend zone of the Eastern Carpathians. The majority of tectonic models lean heavily on subduction processes to explain the Vrancea mantle seismicity and the presence of a Miocene age calc-alkaline volcanic arc in the East Carpathian hinterland. However, recent deep seismic reflection data collected over the Eastern Carpathian bend zone image an orogen lacking (1) a crustal root and (2) dipping crustal-scale fabrics routinely imaged in modern and ancient subduction zones. The DRACULA I and DACIA-PLAN deep seismic reflection profiles show that the East Carpathian orogen is supported by crust only 30-33 km thick while the Focsani basin (foreland) and Transylvanian basin (hinterland) crust is 42 km and 46 km thick respectively. Here the VSZ is interpreted as the former Eastern Carpathian orogenic root which was removed as a result of continental lithospheric delamination and is seismically foundering beneath the East Carpathian bend zone. Because large volumes of calc-alkaline volcanism are typically associated with subduction settings existing geochemical analyses from the Calimani, Gurghiu, and Harghita Mountains (CGH) have been reinterpreted in light of the seismic data which does not advocate the subduction of oceanic lithosphere. CGH rocks exhibit a compositional range from basalt to rhyolite, many with high-Mg
机译：罗马尼亚的Vrancea地震发生带（VSZ）是东喀尔巴阡山脉弯曲带下方上地幔的中深度地震活动的陡峭北倾体积（30 x 70 x 200 km）。大多数构造模型在很大程度上依靠俯冲过程来解释东喀尔巴阡山脉腹地的Vrancea地幔地震活动和中新世时代的钙碱性火山弧的存在。但是，最近在喀尔巴阡山脉东部弯曲带上收集到的深地震反射数据显示，一个造山带缺少（1）地壳根和（2）浸没在现代和古代俯冲带中常规成像的地壳规模的织物。 DRACULA I和DACIA-PLAN深地震反射剖面表明，东喀尔巴阡造山带仅由30-33 km厚的地壳支撑，而Focsani盆地（前陆）和Transylvanian盆地（腹地）的地壳分别厚42 km和46 km。在这里，VSZ被解释为前东喀尔巴阡山造山带根，由于大陆岩石圈的分层而被移走，并且在东喀尔巴阡山弯曲带之下发生了地震。由于大量的钙碱性火山作用通常与俯冲环境有关，因此根据地震数据（不主张俯冲海洋岩石圈），重新解释了卡利马尼，古吉和哈尔吉塔山脉（CGH）的现有地球化学分析结果。 CGH岩石的成分范围从玄武岩到流纹岩，许多含高镁

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  • 作者

    Fillerup, Melvin A.;

  • 作者单位

    University of South Carolina.;

  • 授予单位 University of South Carolina.;
  • 学科 Geology.;Geochemistry.;Geophysics.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 108 p.
  • 总页数 108
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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