喀尔巴阡山脉是否构造活跃?

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
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引用次数: 0

摘要

在位于波兰外喀尔巴阡山脉(POC)东段的三个深钻孔中对当今的构造应力状态进行了研究。在这些钻孔中观察到了最大水平应力(SH)的显著旋转,这些钻孔位于岩脉上部的反斜铰接处。对最深的钻孔 D-1(深度 5.5 千米)进行了一维地质力学建模,以确定应力梯度剖面。在弹性水平应变可变的情况下,获得了模型的最优解,并通过大量的钻孔壁压缩和拉伸破坏(分别为破裂和钻孔引起的断裂)进行了验证。应变在主推断层(MTF)上呈阶梯状变化,在断层壁内呈线性变化。确定了喀尔巴阡山岩层以走向滑动断层应力机制为主,MTF 以上为推覆断层,MTF 以下为正断层。根据推断,在有能力的地层中,优先定向的原有断层和断裂重新活化的临界应力状态。对应力方向和大小变化的一致解释表明,由于 MTF 的重新激活和喀尔巴阡山底断层的未重新激活,反斜线在较浅的结构层面上发生了当代重新折叠。将这些结果与之前在喀尔巴阡山东段进行的研究测量结果相结合,可以看出自生基底(北-南)和岩层(东北-西南)中 SH 的区域走向不同。这些结果表明,增生楔的上部发生了薄层压缩性再活化,而岩层的下部仍处于被动状态,或局部容易发生轻微的走向滑动或正断层。这些结果与 POC 同期延伸塌陷的假设相矛盾。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Are the Carpathians tectonically active?: Geomechanical study in deep boreholes in the outer Carpathians (Poland)

Present-day tectonic stress state was investigated in three deep boreholes located in the eastern segment of the Polish Outer Carpathians (POC). Significant rotations of the maximum horizontal stress (SH) were observed in these boreholes, located at the hinge of the anticlines in the upper part of the nappes. For the deepest borehole, D-1 (5.5 km depth), 1D geomechanical modelling was performed to determine the stress gradient profiles. An optimal solution of the model, validated by numerous compressional and extensional failures (breakouts and drilling-induced fractures, respectively) of the borehole wall, was obtained for variable elastic horizontal strain. The strain varies stepwise across the Main Thrust Fault (MTF) and linearly within its walls. The dominance of a strike-slip faulting stress regime was determined for the Carpathian nappes, with contributions from thrust faulting above the MTF and normal faulting below the MTF. A critical stress state for reactivation of preferentially oriented pre-existing faults and fractures was inferred for the competent strata. A consistent interpretation of the variations in stress orientation and magnitude, suggests a contemporary refolding of the anticline at a shallower structural level, enhanced by the reactivation of the MTF and a lack of reactivation of the Carpathian Bottom Thrust. Integration of these results with measurements from previous studies in the eastern segment of the POC indicates a different regional orientation of SH in the autochthonous basement (N-S) and in the nappes (NE-SW). These results indicate a thin-skinned compressive reactivation of the upper part of the accretionary wedge, with the lower part of the nappes remaining passive, or locally prone to minor strike-slip or normal faulting. These results contradict the hypothesis of a contemporaneous extensional collapse of the POC.

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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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