39Ar-40Ar Geochronology and EBSD Analysis of Mylonite in Zanhuang Massif: Implications for Paleoproterozoic Tectono-Thermal Evolution of North China Craton
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摘要: 赞皇地体位于华北克拉通中部造山带的东南段，出露有太古代至古元古代复杂的岩石组合和构造变形，是研究华北克拉通中部造山带早前寒武纪构造热演化的重要窗口.对赞皇地体内一条出露完好的韧性剪切带进行了大比例尺岩石-构造填图、岩相学、黑云母39Ar-40Ar年代学和石英EBSD组构分析，限定了剪切带的运动学特征和形成时代，进一步探讨华北克拉通古元古代构造热演化过程.韧性剪切带主体岩性为花岗质糜棱岩，主要由石英（30%~40%）、黑云母（5%~15%）和长石（35%~55%）组成.韧性剪切带内岩石变形强烈，发育有正断层、褶皱、旋转碎斑等变形构造，面理产状和旋转碎斑均指示北西-南东向的剪切作用.糜棱岩中黑云母氩氩年龄测试得到了1 781~1 745 Ma的坪年龄，表明剪切带形成于古元古代晚期.糜棱岩中石英的EBSD组构反映石英主要为底面a滑移，指示变形温度低于400 ℃.综合赞皇地区前人研究成果，提出赞皇变质地体在古元古代晚期经历了一次构造热事件的强烈扰动.Abstract: The Zanhuang massif is located in the southeast part of the Central Orogenic Belt of the North China Craton, with complex rock association and tectonic deformation from Archaean to Paleoproterozoic. It is important to study the Early Precambrian tectono-thermal evolution of the Central Orogenic Belt of the North China Craton. In this study, a large-scale rock structure mapping, petrography, biotite 39Ar-40Ar geochronology and quartz EBSD fabric analysis of a well-out cropping ductile shear zone in the Zanhuang massif were carried out to define the kinematic characteristics and formation age of the shear zone, and to further explore the Paleoproterozoic tectono-thermal evolution of the North China Craton. The main lithology of the ductile shear zone is granitic mylonite, mainly composed of quartz (30%-40%), biotite (5%-15%) and feldspar (35%-55%). In the study area, the rocks are strongly deformed and metamorphosed, and a series of normal faults, folds, lineaments, foliations, and rotated porphyroblasts are developed. The surface occurrence and the trail of rotating patches all indicate the NW-SE shear. A plateau age of 1 781-1 745 Ma for biotite in mylonite was obtained by argon age test, indicating that the shear zone was formed in the Late Paleoproterozoic. EBSD fabric of quartz in mylonite shows that the quartz is mainly underside a-slip, indicating that the deformation temperature is lower than 400 ℃. Based on the previous research results, this study shows that the Zanhuang metamorphic complex experienced a strong disturbance caused by a tectono-thermal event in the Late Paleoproterozoic.
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Key words:
- Paleoproterozoic /
- mylonite /
- 39Ar-40Ar dating /
- tectono-thermal evolution /
- Zanhuang massif /
- North China Craton /
- structural geology
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图 1 华北克拉通构造简图(a)、华北中部造山带中部各变质地体分布图(b)和赞皇变质地体地质图(c)
图a由东部陆块、西部陆块和中部造山带组成. LL. 吕梁地块；WT. 五台地块；HS. 恒山地块；FP. 阜平地块；ZH. 赞皇地块
Fig. 1. Structural diagram of the NCC, which consists of the eastern block, the western block and the central orogenic belt (a), distribution of metamorphic terrane in the central orogenic belt of North China (b) and geologic map of the Zanhuang metamorphic massif (c)
图 2 剪切带露头岩性-构造图
图a为剪切带构造素描图，高15 m，全长约90 m；图b，c，d，g，i为剪切带内褶皱；图e旋转碎斑、面理；图f为糜棱岩面理；图h为正断层及牵引构造；图j为糜棱岩面理法线极射赤平投影
Fig. 2. Shear zone outcrop lithology-structure map
图 3 野外变形构造
a.露头褶皱与断层；b.剪切带内强烈的面理；c~f.长石的“σ”旋转碎斑，指示北西-南东向剪切
Fig. 3. Field deformation tectonics
图 4 糜棱岩镜下照片
a. 长石聚片双晶与钾长石格子双晶；b. 定向的黑云母、石英；c. 钾长石旋转残斑；d. 韧性变形的石英条带. 正交偏光镜下，Qtz. 石英，Pl. 斜长石，Kf. 钾长石，Bi. 黑云母
Fig. 4. Photomicrographs of mylonite (crossed polarized light)
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