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首页> 外文期刊>Journal of structural geology >Structural record of the mechanical evolution of mixed zones in faulted poorly lithified sediments, Rio Grande rift, New Mexico, USA
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Structural record of the mechanical evolution of mixed zones in faulted poorly lithified sediments, Rio Grande rift, New Mexico, USA

机译：美国新墨西哥州里奥格兰德大裂谷断层较弱的沉积物中混合带力学演化的结构记录

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摘要

Structural characteristics of faults in poorly lithified sediments of the Albuquerque Basin, New Mexico, USA record the structural and mechanical development of mixed zones. Mixed zones exhibit macroscopically ductile structures, including foliations and lineations, formed by sediment disaggregation and penetrative particulate flow accompanied to varying degrees by cataclasis in sandy sediments. These structures are overprinted by deformation bands, indicating a temporal and mechanical shift to localized cataclasis. The observations are consistent with the inferred consolidation history (progressive overconsolidation) of the fault and host sediments, including tectonic compaction in the fault zone, as well as predictions from critical state soil mechanics theory. These results have implications for the interpretation of fault-zone defor-mational histories in general. Structures formed before complete lithification are likely to be preserved even where overprinted by later structures, as deformation is likely to become increasingly localized with lithification. Mixed zones may also complement fault cores and contribute to the sealing capacity of faults, as the processes by which they are produced demonstrably reduce permeability. A better understanding of how they form therefore contributes to understanding the mechanics of fault seal development in poorly lithified materials, which are physically distinct from fully lithified rock.
机译：美国新墨西哥州阿尔伯克基盆地的弱化沉积物中的断层结构特征记录了混合带的结构和力学发展。混合区表现出宏观延性结构，包括叶状和线状，是由沉积物的分解和渗透性颗粒流（由沙质沉积物中的催化作用不同程度地伴随着）形成的。这些结构被形变带套印，表明在时间和机械上都向局部催化转变。这些观察结果与推断的断层和宿主沉积的固结历史（进行性超固结）一致，包括断层带的构造压实以及临界状态土壤力学理论的预测。这些结果对断层带变形历史的解释具有普遍意义。即使在后来的结构叠印的情况下，也可能保留完整的石化之前形成的结构，因为随着石化的作用，变形会越来越局部化。混合带还可以补充断层岩心，并有助于断层的封闭能力，因为生产它们的过程明显降低了渗透率。因此，对它们的形成方式的更好理解有助于理解弱化材料中断层封闭发展的机理，这些材料在物理上与完全石化的岩石不同。

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