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首页> 外文期刊>Journal of geodynamics >Multiple movements recorded in a crustal weakness zone in NE Iberia: The Valles-Penedes Fault revisited
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Multiple movements recorded in a crustal weakness zone in NE Iberia: The Valles-Penedes Fault revisited

机译：伊比利亚东北部地壳薄弱带记录了多种运动：重新研究了Valles-Penedes断层

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摘要

Structural analysis and Anisotropy of Magnetic Susceptibility are here applied to the fault zone (several hundreds of meters thick) associated with an E-W striking, 20 km-long segment of the Valles-Penedes Fault (Catalan Coastal Ranges). The results obtained indicate a complex structure, mainly resulting from the imprint of Paleogene compressional events on a fabric inherited from the Variscan orogeny, and its Late-Variscan and Mesozoic extensional history. The prevailing foliation on the fault gouge and microbreccia is oblique (striking NW-SE) to the main E-W trace of the fault. S-C structures affecting the foliation show both sinistral and dextral shear components on NE-SW and NW-SE planes, respectively, consistent with horizontal striations on quartz rods and planar bodies. Pure reverse and normal dip-slip shear components are also inferred from S-C structures at the meso- and micro-scale, indicating a NW to N (reverse), and S-SSE (normal) transport directions. The magnetic foliation averages the orientation of the observed foliation at the outcrop scale and the magnetic lineation shows two maxima. The first maximum has an overall horizontal plunge, parallel to the strike-slip transport direction inferred from S-C structures. The second maximum is parallel to the dip direction of foliation planes and also parallelizes the reverse transport direction and occasionally the intersection lineation between S and C planes, thus revealing the strong heterogeneity and partitioning of deformation. Cataclasis and pressure-solution are the main deformation mechanisms, in agreement with clay composition and low paleotemperatures determined for the Paleogene. The presented results are consistent with Paleogene transpression occurred through strain partitioning between the main thrust separating the Catalan Coastal Range from the Ebro basin (reverse slip) and the Valles-Penedes fault zone (sinistral strike-slip), with an important influence of dextral shear associated to the secondary, WNW-ESE, segment of the fault (either an oblique ramp or resulting from the re-activation of the Llobregat Fault). A subsequent, Neogene extensional imprint slightly modified the compressional fabrics in the fault zone.
机译：此处将结构分析和磁化率各向异性应用于与E-W撞击，Valles-Penedes断层（加泰罗尼亚海岸山脉）长20公里的断层相关的断层带（几百米厚）。获得的结果表明结构复杂，这主要是由于古近纪压缩事件在从瓦里斯卡山造山带继承的织物上的印记及其晚期瓦里斯卡纳和中生代的伸展历史造成的。断层泥和微角砾岩上的主要叶向斜向（撞击西北-东南）到断裂的主要西西西走向。影响叶状的S-C结构在NE-SW和NW-SE平面上分别显示了左旋和右旋剪切分量，这与石英棒和平面体上的水平条纹一致。还可以从中尺度和微观尺度的S-C结构推断出纯的反向和正常倾滑剪切分量，表明从NW到N（反向）和S-SSE（正常）的运输方向。磁叶面在露头尺度上平均观察到的叶面方向，磁线显示两个最大值。第一最大值具有总体水平下垂，平行于S-C结构推断的走滑运输方向。第二个最大值平行于叶面的倾角方向，还平行于逆向传输方向，有时还平行于S平面和C平面之间的相交线，从而显示出强烈的异质性和变形分区。分解和压力固溶是主要的变形机制，与古近纪确定的粘土成分和低古温度一致。提出的结果与通过将加泰罗尼亚海岸山脉与埃布罗盆地分开的主推力（反向滑移）和Valles-Penedes断裂带（正弦走滑）之间的应变划分而发生的古近纪反演相一致，这对右旋切变有重要影响与次要WNW-ESE断层相关的断层（斜坡或由重新激活Llobregat断层引起）。随后的Neogene延伸压印稍微改变了断层带中的压缩构造。

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  • 来源
    《Journal of geodynamics》 |2018年第11期|96-114|共19页
  • 作者

    Marcen M.; Casas-Sainz A. M.; Roman-Berdiel T.; Griera A.; Santanach P.; Pocovi A.; Gil-Imaz A.; Aldega L.; Izquierdo-Llavall E.;

  • 作者单位

    Univ Zaragoza, Dept Ciencias Tierra, Inst Invest Ciencias Ambientales IUCA, Grp Invest Geotransfer, C Pedro Cerbuna 12, E-50009 Zaragoza, Spain;

    Univ Zaragoza, Dept Ciencias Tierra, Inst Invest Ciencias Ambientales IUCA, Grp Invest Geotransfer, C Pedro Cerbuna 12, E-50009 Zaragoza, Spain;

    Univ Zaragoza, Dept Ciencias Tierra, Inst Invest Ciencias Ambientales IUCA, Grp Invest Geotransfer, C Pedro Cerbuna 12, E-50009 Zaragoza, Spain;

    Univ Autonoma Barcelona, Dept Geol, E-08193 Bellaterra, Cerdanyola Del, Spain;

    Univ Barcelona, Dept Dinam Terra & Ocea, Barcelona, Spain;

    Univ Zaragoza, Dept Ciencias Tierra, Inst Invest Ciencias Ambientales IUCA, Grp Invest Geotransfer, C Pedro Cerbuna 12, E-50009 Zaragoza, Spain;

    Univ Zaragoza, Dept Ciencias Tierra, Inst Invest Ciencias Ambientales IUCA, Grp Invest Geotransfer, C Pedro Cerbuna 12, E-50009 Zaragoza, Spain;

    Univ Pau & Pays Adour, CNRS Total, ES2, Lab Fluides Complexes & Leurs Reservoirs,IPRA, Pau, France;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Anisotropy of magnetic susceptibility; Late-Variscan fault; Kinematic indicators; Cataclasis; Iberia;

    机译：磁化率各向异性;晚期-Variscan断层;运动学指标;Cataclasis;Iberia;

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