| 张祥信.太行山南段自立庄韧性剪切带变形特征[J].地质与勘探,2021,57(1):166-174 |
| 太行山南段自立庄韧性剪切带变形特征 |
| Deformation characteristics of the Zilizhuang ductile shear zone in the southern Taihang Mountains |
| 投稿时间：2019-09-23 修订日期：2020-02-06 |
| DOI：10.12134/j.dzykt.2021.01.015 |
| 中文关键词: 韧性剪切带 古元古代 吕梁运动 太行山南段 中部造山带 |
| 英文关键词: ductile shear zone, Paleoproterozoic, the Lüliang Movement, southern Taihang Mountains, the trans-North China Orogen |
| 基金项目:联合资助 |
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| 中文摘要: |
| 太行山南段临城自立庄地区古元古界甘陶河群中低级变质岩中发育一条左行逆冲型韧性剪切带。自立庄韧性剪切带出露长约10 km, 宽约1 km, 走向NNE, 往西缓倾, 在EW方向上由若干条强变形带与其间的弱变形域或岩块组成, 平面上呈现平行式的组合特征。该韧性剪切带内发育糜棱岩、拉伸线理和皱纹线理、不对称褶皱、石香肠构造和构造透镜体、S-C面理和旋转碎斑等宏观和微观构造。S-C面理、旋转碎斑、不对称褶皱等宏微观变形特征一致表明自立庄韧性剪切带上盘由W往E逆冲的运动学性质。对韧性剪切带宏观、微观构造特征研究基础上, 结合区域资料, 认为自立庄韧性剪切带的形成与华北克拉通古元古代末期西部陆块与东部陆块的EW向碰撞拼合有关, 是18.5 Ga吕梁运动的产物。自立庄韧性剪切带的厘定为太行山南段古元古代构造演化提供了基础资料。 |
| 英文摘要: |
| A sinistral thrust ductile shear zone was recognized in the Zilizhuang area of Lincheng County, southern Taihang Mountains, which developed in the middle-low-degree metamorphic rocks from the Gantaohe Group. The Zilizhuang ductile shear zone consists of several strong deformation zones and intervening weak deformation domains or rock masses, dipping gently westward and striking in NNE direction, with a length of ca. 10 km and a width ca. 1 km. Its deformation zones are nearly parallel to each other. In this ductile zone, there exist many typical macroscopic and microscopic structures, such as mylonite rocks, stretching and crenulation lineations, asymmetrical folds, boudinages and structural lenses, S-C foliations and rotational porphyroclasts. These kinematic markers such as S-C foliations, rotational porphyroclasts and asymmetrical folds show a top-the-east shear sense. The macroscopic and microscopic structures together with regional geological data suggest that the Zilizhuang ductile shear zone resulted from the E-W collision between the Eastern Block and the Western Block of the North China Craton during an 18.5 Ga tectonic movement, i.e. the Lüliang Movement. Thus, the determination of the Zilizhuang ductile shear zone provides constraints on the Paleoproterozoic tectonic evolution of the southern Taihang Mountains. |
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