Deformation and Geochronological Characteristics of Gudonghe Ductile Shear Zone in Yanbian Area
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摘要: 古洞河韧性剪切带位于兴蒙造山带东段南缘，其变形特征和时间对探讨延边地区晚古生代-中生代构造演化具有重要意义.鉴于此，对该韧性剪切带进行了锆石U-Pb年代学和显微构造解析，以期限定韧性剪切带变形时间和特征.研究结果显示，古洞河韧性剪切带具有多期变形的特征，晚期变形糜棱叶理倾向为西，倾角较缓，线理倾伏向为南西，具有由南西向北东方向右行逆冲的特征.其分形维数值为1.159~1.214，Flinn参数K值为0.19~0.31，Kruhl温度计显示变形温度为450~550℃，石英动力重结晶粒径估算的差应力值为16.83~20.09 MPa，古应变速率为10-12~10-14 s-1.古洞河韧性剪切带花岗质糜棱岩锆石U-Pb年龄为192±2 Ma，晚期变形时代应为早侏罗世，形成应与早侏罗世古太平洋板块向欧亚大陆俯冲有关.Abstract: The Gudonghe ductile shear zone, located in southern section of eastern Xing-Meng orogenic belt, is a key to understanding the Late Paleozoic-Early Mesozoic tectonic evolution in Yanbian area. In this paper, zircon U-Pb dating and microstructure analysis were done for constraining the deformation time and features of Gudonghe ductile shear zone. The results show that Gudonghe ductile shear zone represents a multi-phase suite of mylonites with dextral shear thrust characteristics and W gneissosity and SW lineation. Systematic measurement of finite strains of Quartz in later mylonites indicates that the K value is 0.19 to 0.31. And Kruhl thermometer shows that the deformation temperatures of ductile shear zone range from 450 to 550℃. Fractal analysis shows that the numbers of fractal dimension vary from 1.159 to 1.214. The paleo-stress values from dynamically recrystallized grain sizes of quartz are 16.83 to 20.09 MPa, while estimated strain rates are on the order of 10-12 to 10-14 s-1. The zircon U-Pb dating of granitic mylonite is 192±2 Ma, indicating that the deformation time of Gudonghe ductile shear zone is not earlier than Early Jurassic and the deformation features show the ductile shear zone thrust from southwest to northeast. However, the tectonic setting of Gudonghe ductile shear zone is mostly related to the subduction of paleo-Pacific beneath the Eurasian continent.
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图 1 古洞河韧性剪切带地质简图及变形组构与采样位置
Fig. 1. Geological map of Gudonghe ductile shear zone with samples and stereoplot of foliation planes
图 2 古洞河韧性剪切带典型宏观及显微变形特征
Fig. 2. Outcrop-scale and microscopic deformation structures of mylonitic rocks from Gudonghe ductile shear zone
图 3 古洞河韧性剪切带花岗质糜棱岩（FN17）锆石阴极发光图像
Fig. 3. CL images of the zircons from the granitic mylonites from Gudonghe ductile shear zone
图 4 花岗质糜棱岩锆石U-Pb年龄谐和图
Fig. 4. Zircon U-Pb concordia diagram for the granitic mylonite(FN17)
图 5 石英动态重结晶颗粒的粒径-周长双对数图解
Fig. 5. lg-lg plots of perimeter-diameter of dynamically recrystallized quartz grains
图 6 石英动态重结晶颗粒显微构造特征
Fig. 6. The microstructure characteristics of dynamic recrystallization of quartz
图 7 分形维数与变形温度关系
Fig. 7. Relationship between fractal dimension and deformation temperature
图 9 早三叠世和晚三叠世-早侏罗世延边地区构造演化
Fig. 9. Early Triassic and Late Triassic-Early Jurassic tectonic evolution in Yanbian area
表 1 研究区糜棱叶理统计
Table 1. The data of mylinitic foliation in the study area
序号 倾向 倾角(°) 纬度(N) 经度(E) 1 281 33 42°21ˊ12" 129°17ˊ5" 2 294 40 42°21ˊ17" 129°17ˊ8" 3 270 15 42°23ˊ26" 129°17ˊ34" 4 275 55 42°21ˊ12" 129°15ˊ6" 5 280 50 42°22ˊ55" 129°14ˊ7" 6 260 45 42°22ˊ53" 129°14ˊ7" 7 320 27 42°21ˊ42" 129°16ˊ30" 8 270 45 42°19ˊ20" 129°12ˊ52" 9 265 25 42°20ˊ28" 129°17ˊ5" 10 265 25 42°19ˊ54" 129°16ˊ17" 11 300 55 42°18ˊ52" 129°16ˊ14" 12 315 30 42°18ˊ45" 129°15ˊ56" 13 315 33 42°19ˊ26" 129°15ˊ44" 
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表 2 古洞河韧性剪切带有限应变测量数据
Table 2. Data of finite-strain measurement from Gudonghe ductile shear zone
样品号 X/Y Y/Z X/Z ln（X/Y） ln(Y/Z) K= ln(X/Y)/ln(Y/Z) BJ8 1.14 2.00 2.28 0.13 0.69 0.19 BJ9 1.22 2.22 2.70 0.20 0.80 0.25 BJ13 1.33 2.50 3.30 0.28 0.91 0.31
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表 3 石英动态重结晶颗粒边界的分形特征和古差力应力值
Table 3. Fractal characteristics of dynamically recrystallized quartz grain boundary in mylonites and estimation of paleo-stress
样品号 测量数 粒径分布（μm） 平均粒径（μm） 周长分布（μm） 平均周长（μm） 分形维数D 相关系数 古差力应力值 BJ8 60 25.82~209.64 82.82 211~2 534 703.55 1.216 0.943 20.09 BJ9 60 35.95~193.01 94.99 211~2 257 814.45 1.216 0.943 18.02 BJ13 59 31.89~401.00 103.56 211~3 452 884.08 1.159 0.959 16.83 注：古差力应力值根据Stipp（2003）计算.
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表 5 不同方法估算的应变速率
Table 5. Estimation of strain rate by different methods
样品号 Δσ(MPa) 温度（℃） Parrish et al.(1976) Koch et al.(1989) Koch (1983) Kronenberg and Tullis(1984) Paterson and Luan(1990) Hirth et al.(2001) BJ8 20.09 450 10-15 10-14 10-14 10-12 10-13 10-16 550 10-13 10-13 10-12 10-10 10-12 10-15 BJ9 18.02 450 10-15 10-14 10-14 10-12 10-14 10-16 550 10-13 10-13 10-13 10-11 10-12 10-15 BJ13 16.83 450 10-15 10-14 10-14 10-12 10-14 10-17 550 10-13 10-13 10-13 10-11 10-12 10-15
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