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首页> 外文期刊>Geosciences >Joint and Lineament Patterns across the Midcontinent Indicate Repeated Reactivation of Basement-Involved Faults
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Joint and Lineament Patterns across the Midcontinent Indicate Repeated Reactivation of Basement-Involved Faults

机译：整个中大陆的联合和线性模式表明基底相关断层的重复激活

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Joint networks hosted in successively younger rocks, developing as a result of forced (trishear) folding of a rock mass above a deep-seated fault, can be used to infer the reactivation history of that deep-seated fault. This study aims to use joint networks in Pennsylvanian, Permian and Cretaceous rocks to document evidence of reactivation on basement faults during the Paleozoic and Mesozoic of Nebraska and Kansas. The most prominent basement features in southeast Nebraska and northeast Kansas are oriented NE-SW, likely related to the Midcontinent Rift System and Nemaha Uplift, and oriented NW-SE, likely related to fabrics from the Central Plains Orogeny. These features are well defined in the potential fields data. Joint patterns in the study area show an E-W oriented trend, as well as clearly discernable NE-SW and subsidiary N-S and NW-SE trends. The E-W trend is interpreted to be related to far-field stresses from Laramide and Ancestral Rocky Mountain orogenic events, whilst the NE-SW trend is interpreted to be related to subtle reactivation on the Mid-continent rift and related faults, observed in basement data. These movements produced stresses of sufficient magnitude to produce joints in the post-rift rock units, but not sufficient to generate shear fractures. Similarly, the ~N-S and NW-SE joint trends are taken as evidence of subtle reactivation on the Nemaha Uplift and Central Plains Orogeny systems, generating joints by the formation of forced folds. This contribution therefore provides a convincing case study of the value of coupled potential fields and surface feature studies in discerning buried tectonic trends and subtle reactivation thereon.
机译：由于在深部断层之上强迫岩体折叠（三剪切）而形成的，接连于较年轻的岩石中的节理网络可用于推断该深部断层的复活历史。这项研究旨在利用宾夕法尼亚，二叠纪和白垩纪岩石的联合网络来记录内布拉斯加和堪萨斯州的古生代和中生代地下断层活化的证据。内布拉斯加州东南部和堪萨斯州东北部最显着的基底特征是NE-SW定向，可能与中陆裂谷系统和Nemaha隆升有关，而NW-SE定向则可能与中原造山带的织物有关。这些功能在潜在字段数据中定义良好。研究区域的联合模式显示了以E-W为导向的趋势，以及清晰可辨的NE-SW和辅助N-S和NW-SE趋势。 EW趋势被解释为与拉拉米德和祖先洛基山造山事件的远场应力有关，而NE-SW趋势被解释为与中陆裂谷和相关断层的细微复活有关，在地下资料中观察到。这些运动产生的应力强度足以在裂谷后的岩石单元中形成节理，但不足以产生剪切裂缝。同样，〜N-S和NW-SE联合趋势被认为是Nemaha隆升和中原造山系统上微妙的再活化的证据，通过强迫褶皱的形成而产生了联合。因此，这一贡献为耦合势场和表面特征研究的价值提供了令人信服的案例研究，可用于识别地下构造趋势和对其进行细微的活化。

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