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首页> 外文期刊>Tectonics >Controls of lithospheric structure and plate kinematics on rift architecture and evolution: An experimental modeling of the Baikal rift
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Controls of lithospheric structure and plate kinematics on rift architecture and evolution: An experimental modeling of the Baikal rift

机译:岩石圈结构和板块运动学对裂谷构造和演化的控制:贝加尔湖裂谷的实验模型

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摘要

[1] Analog models investigate the evolution and architecture of the Baikal rift in relation to the rheology of the extending lithosphere and rift kinematics. The models focus on the development of the narrow, deep, and asymmetric basins composing Lake Baikal and reproduce the extension between the strong Siberian craton and the weaker Sayan-Baikal belt. Model results suggest that the presence of a near-vertical weak suture separating the cratonic keel from the mobile belt represents the more convenient rheological configuration leading to a narrow rift characterized by prominent vertical motions and deep depressions. These depressions are typically asymmetric, and model results suggest that this asymmetry is a consequence of lateral variations in lithospheric rheology, which is in turn related to both the variation in thickness of the strong mantle and, more importantly, the variation in the brittle-ductile transition depth between the craton and the belt. A significant shallowing of the brittle-ductile transition in the crust passing from the craton to the belt is required to fit the asymmetric architecture of the Baikal basins, with a master fault on the craton side and a monocline with no significant faulting on the belt side. Analysis of the model deformation pattern suggests that the overall architecture of the basins hosting Lake Baikal is best fitted for a N140°E directed extension, similar to the current GPS-derived motion and compatible with the stress field inferred on the basis of fault and focal mechanism data. This kinematics (along with the shape of the Siberian craton) exerted the major control on the plan view fault architecture and its along-axis variations.
机译:[1]模拟模型调查了贝加尔湖裂谷的演化和构造与岩石圈扩展和裂谷运动学的关系。这些模型的重点是组成贝加尔湖的狭窄,深层和不对称盆地的发育,并再现了强西伯利亚克拉通和较弱的萨彦-贝加尔带之间的延伸。模型结果表明,将克拉通龙骨与活动带分隔开的近垂直弱缝线代表了更方便的流变构造,从而导致了以明显的垂直运动和深陷为特征的狭窄裂谷。这些凹陷通常是不对称的,模型结果表明,这种不对称是岩石圈流变学横向变化的结果,而横向变化又与强地幔厚度的变化有关,更重要的是,与脆性-延性的变化有关。克拉通和皮带之间的过渡深度。为了适应贝加尔盆地的非对称构造,需要在克拉通到带的地壳中使脆性-韧性过渡带明显变浅,以在克拉通侧具有主断层,而在带带侧没有明显断层的单斜线。对模型变形模式的分析表明,容纳贝加尔湖的盆地的整体结构最适合N140°E定向扩展,类似于当前GPS衍生的运动,并且与基于断层和震源推断的应力场兼容机制数据。这种运动学(以及西伯利亚克拉通的形状)对平面断层构造及其沿轴向的变化施加了主要控制作用。

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  • 来源
    《Tectonics》 |2011年第3期|p.214-229|共16页
  • 作者单位

    Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, Florence, Italy;

    Dipartimento di Scienze della Terra, Universita degli Studi di Firenze, Florence, Italy;

    ISTEP, Universite Paris 6, Paris, France ,Now at Geoazur, UMR 6526, CNRS-UNS-UPMC-IRD, Villefranche-sur-mer, France;

    Dipartimento di Scienze della Terra, Universita degli Studi di Firenze, Florence, Italy;

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