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首页> 外文会议>Geothermal Resources Council Annual Meeting >Scaled Sandbox Modeling of Transtensional Pull-Apart Basins--Applications to the Coso Geothermal System
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Scaled Sandbox Modeling of Transtensional Pull-Apart Basins--Applications to the Coso Geothermal System

机译：横静脉拉伸盆地的缩放沙箱建模 - 应用于COSO地热系统

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Results of a sandbox modeling program investigating transtensional strike-slip pull-apart basins are presented in this talk. The models are designed to investigate gross basin architecture as well as intra-basin deformation and compare the results to the structural setting of the Coso Geothermal System. The base geometry of the Coso system has been approximated to a 30 deg releasing stepover. In the models this geometry is approximated by cut aluminum plates linked by a stretching rubber membrane to generate intra-basin extension and subsidence. The Coso pull-apart is further complicated by a degree of transtension across the system and this is modeled by a 5 deg divergent oblique-motion across the master strike-slip faults. Brittle cover rocks are modeled by fine-grained (100 (mu)m) silica sand and ductile layers by silicone polymers. Single polymer layers model a conservative brittle-ductile transition in the Coso area at 6 km. Dual polymer layers impose a local rise in the brittle-ductile transition to 4 km depth. In all models the gross geometry consists of a lazy-Z shaped basin consisting of terraced sidewall fault systems and a cross-basin fault zone (CBFZ) linking the offset principal displacement zones. Models conducted with symmetric displacements on the moving plates generated intra-basin horst structures that separated dual depocenters. Variations in displacement ratios on the master plates resulted in the development of asymmetric basins with distinctly terraced margins on the low-displacement plate and dissected by cross-basin fault zones with complex horst structures. The addition of a high-level localized polymer layer serves to concentrate deformation further along the CBFZ. In these models the CBFZ is a narrow, deep, graben structure that links the PDZs flanked by low displacement margins and segmented horst structures. The results of the modeling program bear strong resemblances to the structures seen on the ground at Coso. Intra-basin highs such as the Coso Range are generated in the pull-aparts and the geometry and location of these highs is dependent on the imposed boundary conditions. Basin asymmetry is strongly linked to variations in relative plate motions. Future modeling will seek to generate 4D evolutionary models of these pull-apart structures using models "frozen" at various displacements as well as detailed analysis of surface deformation using high resolution laser scanners that rapidly generate large data clusters at each increment of deformation.
机译：在这次谈话中提出了调查静音滑行拉伸盆地的沙箱建模程序的结果。该模型旨在调查总盆地建筑以及盆内变形，并将结果与​​COSO地热系统的结构设置进行比较。 COSO系统的基础几何形状已经近似为30°释放踩踏。在模型中，该几何形状由拉伸橡胶膜连接的切割铝板近似，以产生盆内延伸和沉降。 COSO拉伸在系统上的静音程度进一步复杂，这通过跨主滑动故障的5°发散的倾斜运动来建模。通过硅氧烷聚合物，通过细粒（100（mu）M）硅砂和延展层进行脆性盖岩石。单个聚合物层模型在6公里处的COSO区域中的保守脆性转换。双聚合物层施加施用脆性转换至4km深度的局部升高。在所有型号中，总体几何形状由延长侧壁故障系统和连接偏移主位移区域的交叉盆地故障区（CBFZ）组成的懒惰Z形盆组成。在移动板上的对称位移进行的模型产生了分离双复印机的盆地内部占星结构。在在主板位移的比率的变化导致了不对称盆地的发展与在低位移板明显梯田余量和由具有复杂结构垒横盆断裂带解剖。添加高级局部聚合物层用于沿CBFZ进一步浓缩变形。在这些模型中，CBFZ是一个狭窄的深，Graben结构，将PDZ链接在低位移边距和分段的Horst结构中。建模程序的结果与COSO在地面上看到的结构相比，具有强烈的相似之处。池内高等诸如COSO范围的盆地高度在拉伸分开中产生，这些高度的几何形状和位置取决于施加的边界条件。盆地不对称与相对板运动的变化强烈连接。未来的建模将寻求使用各种位移的模型“冷冻”的模型来生成这些拉伸结构的4D进化模型，以及使用高分辨率激光扫描仪进行表面变形的详细分析，以便在每个增量变形下快速产生大数据集群。

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