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Late Cenozoic tectonic evolution of the western Eger Rift

西埃格尔裂谷晚新生代构造演化

基本信息

批准号：
282494939
负责人：
Professor Dr. Jonas Kley
金额：
--
依托单位：
Abteilung Sedimentologie und Umweltgeologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/282494939?language=en
关键词：
Late Cenozoic tectonic evolution western

项目摘要

The Eger Rift and Cheb basin in northwestern Bohemia are associated with earthquake swarms, voluminous CO2 outgassing and Quaternary mantle-derived volcanism. First-order structural relationships indicate that the NNW-striking Marianske Lazne Fault (MLF), the master fault of the Cheb basin, has cross-cut the Eger rift at right angles and offset it with dominantly normal sense of motion. These relationships suggest that activity on the MLF was accentuated late in the history of the rift - around early Pliocene time -, reflecting a fundamental change of the governing stress field. We propose to constrain the tectonic evolution of the two basins, and in particular of the Krusne Hory (Erzgebirge) and Marianske Lazne bounding faults over Late Cenozoic time. This will be done by modelling the subsidence of the basins from stratigraphic data. Rift shoulder uplift, exhumation and fault offsets will be constrained by low-T thermochronology, especially (U-Th)/He on apatite (AHe). Subsidence and exhumation data must be matched by a 3D, restorable structural model of the Eger Rift-Cheb basin junction, thus constraining the deep architecture of the large faults. Tectonic geomorphologic analysis based on high-resolution digital elevation models (DEMs) and complemented by ground truthing and fault-slip analysis will be used to detect smaller-scale, distributed faulting. These data as well as those derived from distributed seismicity in our Czech companion project are to be compared to strain patterns predicted by the structure model under varying movement directions. Such kinematic variations for the MLF will be deciphered by detailed geomorphological and paleoseismological investigations that are also part of the Czech project. The results of both projects will be combined in a detailed tectonic model of the evolution in Miocene through Recent time. This model will also help to understand the present-day localisation of fluid ascent and earthquake swarms.

波希米亚西北部的埃格裂谷和切布盆地与地震群、大量的CO2释气和第四纪幔源火山活动有关。一级构造关系表明，北北西走向的Marianske Lazne断层（MLF），切布盆地的主断层，有横切埃格裂谷在直角和抵消它与占主导地位的正常运动。这些关系表明，MLF的活动在裂谷历史的晚期--上新世早期--得到了加强，反映了主导应力场的根本变化。我们建议约束构造演化的两个盆地，特别是Krusne霍里（Erzgebirge）和Marianske Lazne边界断层晚新生代的时间。这将通过根据地层数据建立盆地沉降模型来实现。低T热年代学，特别是（U-Th）/He/磷灰石（AHe）关系，将制约断肩隆升、折返和断层错断。沉降和剥露数据必须与埃格裂谷-切布盆地交界处的三维、可解释的结构模型相匹配，从而约束大断层的深部结构。将使用基于高分辨率数字高程模型（DEM）并辅以地面实况和断层滑动分析的构造地貌分析来检测较小规模的分布式断层。这些数据以及来自我们捷克同伴项目的分布式地震活动的数据将与不同运动方向下结构模型预测的应变模式进行比较。多边基金的这种运动学变化将通过详细的地貌学和古地震学调查来解释，这些调查也是捷克项目的一部分。这两个项目的结果将结合在一个详细的构造模型的演变，在中新世通过最近的时间。这个模型也将有助于理解当今流体上升和地震群的局部化。