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南天山中段桑树园子韧性剪切带的形成时限及其构造意义

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邓松涛郭召杰张志诚廖国辉. 南天山中段桑树园子韧性剪切带的形成时限及其构造意义[J]. 中国地质, 2006, 33(3): 641-647.
引用本文: 邓松涛郭召杰张志诚廖国辉. 南天山中段桑树园子韧性剪切带的形成时限及其构造意义[J]. 中国地质, 2006, 33(3): 641-647.
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DENG Song-tao,GUO Zhao-jie,ZHANG Zhi-cheng, LIAO Guo-hui. Timing of the formation of the Sangshuyuanzi ductile shear zone in the central segment of the South Tianshan and its tectonic significance[J]. Geology in China, 2006, 33(3): 641-647.
Citation: DENG Song-tao,GUO Zhao-jie,ZHANG Zhi-cheng, LIAO Guo-hui. Timing of the formation of the Sangshuyuanzi ductile shear zone in the central segment of the South Tianshan and its tectonic significance[J]. Geology in China, 2006, 33(3): 641-647.
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南天山中段桑树园子韧性剪切带的形成时限及其构造意义

  • 北京大学造山带与地壳演化教育部重点实验室,北京 100871

Timing of the formation of the Sangshuyuanzi ductile shear zone in the central segment of the South Tianshan and its tectonic significance

  • Key Laboratory of Orogenic Belts and Crustal Evolution of the Ministry of Education, Peking University, Beijing, 100871, China

摘要

    摘要
  • 提要：南天山中段桑树园子韧性剪切带是一条近东西走向的剪切带，带内面理、线理、不对称构造广泛发育，通过运动学分析判断该剪切带为左旋走滑性质。剪切带内糜棱岩中的白云母40Ar/39Ar测年获得坪年龄（393±6） Ma和等时线年龄（389±3） Ma；带内雁行式裂隙中的黑云母40Ar/39Ar测年获得坪年龄（366.5±2） Ma和等时线年龄（365±3） Ma。结合区域大地构造背景，笔者认为，桑树园子韧性剪切带是由塔里木板块和哈萨克斯坦—伊犁板块斜碰撞产生的同碰撞走滑构造带，在斜碰撞过程中起到平行板块边界方向的应变分解作用。
    Abstract：The Sangshuyuanzi ductile shear zone in the central segment of the South Tianshan is an east-west-trending shear zone, in which foliations, lineations and asymmetric structures are well developed. Based on a kinematic analysis,the authors think that the Sangshuyuanzi ductile shear zone is of sinistral strike-slip nature. 40Ar/39Ar dating of muscovites from mylonite in the shear zone yields a plateau age of 393±6 Ma and an isochron age at 389±3 Ma. 40Ar/39Ar dating of biotites from en-echelon fractures in the zone gives a plateau age of 366.5±2 Ma and an isochron age of 365.0±3 Ma. According to the above-mentioned study, combined with the regional tectonic background, this paper suggests that the Sangshuyuanzi ductile shear zone is a syncollisional strike-slip tectonic zone formed by oblique collision between the Tarim plate and the Kazakhstan-Ili plate, which resulted in strain partitioning parallelly to the boundary of the two plates.
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刊出日期:  2006-06-24

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