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    滇西澜沧江构造带中-南段澜沧群变质变形期次及Ar-Ar年代学约束

    毕丽莎 梁晓 王根厚 张海迪 王泉 吴春娇

    毕丽莎, 梁晓, 王根厚, 张海迪, 王泉, 吴春娇, 2018. 滇西澜沧江构造带中-南段澜沧群变质变形期次及Ar-Ar年代学约束. 地球科学, 43(9): 3252-3266. doi: 10.3799/dqkx.2018.999
    引用本文: 毕丽莎, 梁晓, 王根厚, 张海迪, 王泉, 吴春娇, 2018. 滇西澜沧江构造带中-南段澜沧群变质变形期次及Ar-Ar年代学约束. 地球科学, 43(9): 3252-3266. doi: 10.3799/dqkx.2018.999
    Bi Lisha, Liang Xiao, Wang Genhou, Zhang Haidi, Wang Quan, Wu Chunjiao, 2018. Metamorphism-Deformation Phases and Ar-Ar Chronological Constraints of the Lancang Group in the Middle and Southern Sections of the Lancangjiang Tectonic Belt, Western Yunnan. Earth Science, 43(9): 3252-3266. doi: 10.3799/dqkx.2018.999
    Citation: Bi Lisha, Liang Xiao, Wang Genhou, Zhang Haidi, Wang Quan, Wu Chunjiao, 2018. Metamorphism-Deformation Phases and Ar-Ar Chronological Constraints of the Lancang Group in the Middle and Southern Sections of the Lancangjiang Tectonic Belt, Western Yunnan. Earth Science, 43(9): 3252-3266. doi: 10.3799/dqkx.2018.999

    滇西澜沧江构造带中-南段澜沧群变质变形期次及Ar-Ar年代学约束

    doi: 10.3799/dqkx.2018.999
    基金项目: 

    中央高校基本科研业务费专项资金 2652014004

    中国地质调查局项目 12120115026901

    国家自然科学基金青年基金项目 41402177

    详细信息
      作者简介:

      毕丽莎(1988-), 女, 工程师, 主要从事固体矿产勘查方面的研究工作

      通讯作者:

      梁晓

    • 中图分类号: P54

    Metamorphism-Deformation Phases and Ar-Ar Chronological Constraints of the Lancang Group in the Middle and Southern Sections of the Lancangjiang Tectonic Belt, Western Yunnan

    • 摘要: 澜沧群变质变形过程的厘定有助于揭示澜沧江构造带的演化历史.通过对双江-惠民地区出露的中-低绿片岩相变质岩系与高压变质岩系的"构造-变质"双重解析,发现澜沧群变质岩系:(1)以挤压体制下的褶劈理S2为区域性面理,浅变质岩系中石英脉条带代表的面理S1与层理S0产状一致,并在第2期强烈压扁后与S2近平行;(2)构造样式与变质变形期次在研究区域内基本一致,表现为二叠纪-三叠纪两期次中深构造层次透入性变形为侏罗纪-新生代浅-表层次变形所叠加;(3)高压变质岩记录了两个期次的深层次构造变形,电气石与石榴石变斑晶具有明显的两阶段生长模式,核部(M1aD1a)可能代表了峰期榴辉岩相变质作用,边部代表折返过程中的蓝片岩相(M1bD1b)阶段.高压变质岩与浅变质岩第2期(M2D2)构造层次及变形样式一致,代表折返后的挤压拼贴过程,两者的剪切型褶劈理S2均指示上盘S向的剪切滑动.结合新生代三江地区发生的近90°块体旋转,恢复第2期为上盘指向E的逆冲剪切作用.通过对幸福变质石英砂岩白云母、小黑江多硅白云母和蓝闪石的40Ar-39Ar定年,以及对前人小黑江蓝闪石40Ar-39Ar年龄的重新解释,共厘定出澜沧群4个构造阶段:(1)高压变质岩第1期晚期(D1b)蓝片岩相变质作用(~250 Ma);(2)第2期(M2D2)中层次挤压(215~214 Ma);(3)浅变质岩系第3期早期(D3a)N-S向纵弯褶皱(111.9~103.7 Ma)与晚期(D3b)逆冲(~82.28 Ma);(4)第4期近E-W向纵弯褶皱(新生代,很可能晚于59.18 Ma).

       

    • 图  1  滇西三江构造带大地构造单元划分及澜沧江构造带地质简图

      修改自Heppe(2006)

      Fig.  1.  The general division of tectonic units in the Sanjiang orogenic belt and the geological sketch of the Lancangjiang tectonic belt in western Yunnan

      图  2  临沧幸福镇-澜沧县区域地质简图(a)及澜沧群各期次构造的极射赤平投影(下半球)(b)

      图a显示澜沧江构造带东西向构造分区,修改自王丹丹等(2014);图b显示幸福浅变质岩系、上允北小黑江高压变质岩系、澜沧-惠民浅变质岩系的各期次构造要素

      Fig.  2.  Geological sketch along Xingfu of Lincang-Lancang (a) and the lower hemisphere stereonets of the structures of each deformation stage (b)

      图  3  澜沧-惠民浅变质岩系变形特征

      图a显示面理S2上盘指向S的右行剪切滑动(双重逆冲构造);图b为细长的σ形不对称石香肠,指示上盘S向滑动;图c显示面理S2、S1与S0的置换关系;图d显示收缩型褶劈理(CCC);图e显示近N-S走向的低缓逆冲断层(D3b)截切第3期(D3a)N-S向纵弯褶皱;图f显示第3期(D3)NE向纵弯褶皱

      Fig.  3.  Deformation characteristics of the low-grade metamorphosed rock complex in Lancang-Huimin

      图  4  小黑江高压变质岩系的变形特征

      图a和图b显示面理S2为剪切型褶劈理,内部夹持的石英脉香肠指示上盘向南的左行滑动;图c显示第4期(D4)近E-W向纵弯褶皱与轴面劈理S4;图d显示低角度脆性正断层(D5)

      Fig.  4.  Deformation characteristics of the high-pressure metamorphic rocks in Xiaoheijiang

      图  5  幸福浅变质岩系的变形样式

      图a显示粉砂质或泥质千枚岩中面理S2已经完全置换透入性石英条带代表的第1期面理S1,同斜褶皱指示露头中两者呈平行状;图b~d显示石英砂岩中第3期(D3a)纵弯褶皱及其压溶轴面劈理对面理S2的置换,其中图d显示面理S3已经十分透入(对应Ar-Ar定年样品7-20-6-DKW1);图e显示D3b期脆韧性逆冲断层对D3a期直立褶皱的叠加;图f表明轴面劈理S4对透入性面理S2的置换

      Fig.  5.  Deformation style of shallow metamorphosed clastic rocks in Xingfu

      图  6  澜沧群变质岩系的显微变形特征和构造期次划分

      图a为澜沧-上允浅变质岩系面理S2的显微特征,绢云母/白云母显微形态显示两期变形面理(与图 3c露头相邻);图b为幸福石英砂岩中面理S3对S2的置换,变质相明显高于澜沧-惠民地区(对应Ar-Ar定年样品7-20-6-DKW1);图c显示小黑江多硅白云母片岩中透入性面理S2及后期压溶面理S3,蓝闪石和榍石已明显定向,表明蓝片岩与云母片岩的混合不晚于面理S2时代;图d为多硅白云母片岩中面理S2夹持的电气石构造前变斑晶,核部富集针状蓝闪石(D1a),并被干净的边部(D1b)包围;图e显示多硅白云母片岩中面理S2夹持的石榴石构造前变斑晶,具有两个期次的自形结构,核部白云母等包裹体呈S形(D1a),边部环带干净(D1b);图f显示蓝片岩中透入性面理S2和塑性拉长后的定向蓝闪石、钠长石、绿帘石

      Fig.  6.  Microscopic characteristics of metamorphism/deformation and the classification of structural sequence for Lancang Group

      图  7  澜沧群高压变质矿物40Ar-39Ar年龄谱及白云母Arrhenius图解

      图a为幸福白云母Ar-Ar年龄谱,以及逐步加热过程中10个加热阶段的Ca/K比值变化趋势;图b为重新定义的赵靖等(1994b)粟义蓝闪石Ar-Ar年龄谱;图c~e为白云母York、Arrhenius图解,图d中T为开尔文温度

      Fig.  7.  40Ar-39Ar age spectrum of the high-pressure metamorphic minerals and the Arrhenius diagram of muscovite form Lancang Group

      表  1  澜沧群浅变质岩系二叠纪以后的变质变形期次划分

      Table  1.   The division of the multi-stage metamorphism/deformation since Permian for epimetamorphic rocks of Lancang Group

      期次 变质相 变形样式及层次 时代
      M1D1 澜沧-惠民:低绿片岩相,Chl+Ser+Qtz±Bi
      幸福:部分达中-高绿片岩相,Mus+Ab+Qtz
      递进剪切流变,伴随强烈的压溶分异,绢云母或白云母定向排列构成透入性面理S1,微劈石域见石英脉条带. P2-T2
      M2D2 澜沧-惠民:<低绿片岩相,±Ser±Chl
      幸福:低绿片岩相
      压扁+简单剪切,S1褶皱形成褶劈理S2,沿劈理面指向E的剪切滑动.石英脉变形:紧闭-同斜褶皱、无根褶皱、不对称石香肠. T3
      D3a 澜沧-惠民:未变质
      幸福:透入性压溶作用
      以S2为标志面形成N-S向中常褶皱,次生调节褶皱不均匀应变的小型陡倾逆冲断裂.
      幸福:以S2为标志面形成N-S向中常褶皱,发育较透入轴面劈理S3.
      103.7 Ma
      D3b 未变质 澜沧-惠民:近N-S向近水平逆冲断层,切割D3a褶皱
      幸福:向东陡倾的逆冲断层切过D3a褶皱
      82.28 Ma
      D4 未变质 澜沧-惠民:以S2为标志面形成E-W向中常-开阔褶皱及小型逆冲断层.
      幸福:近E-W向纵弯褶皱及轴面劈理.
      新生代
      (晚于59.18 Ma)
      下载: 导出CSV

      表  2  小黑江高压变质岩二叠纪以后的变质变形期次划分

      Table  2.   The classification of metamorphism/deformation since Permian for the high-pressure metamorphic rocks in Xiaoheijiang area

      期次 变质相 变形样式 时代
      M1aD1a 早期变质(可能为榴辉岩相-EC?)Grt+白云母 Grt1同构造或构造后变斑晶及内部S形白云母包迹面理S1a >255 Ma
      M1bD1b 蓝片岩相(Ep-BS)多硅白云母片岩:Grt+Phen+Gl+Tur+Ttn;蓝片岩,Gl+Ep+Ab 多硅白云母片岩:Grt2后构造变斑晶,矩形石英条带;Tur后构造变斑晶及内部Gl包体面理S1b. 248.5~255.0 Ma
      M2D2 绿片岩相(GS)Bi+Ab Phen(M1D1)旋转后定向排列构成褶劈理S2,劈理域内浸染状分布Bi;Ab同构造变斑晶压力影构造,内含S1bPhen的S形包迹;石英亚晶粒及波状消光. 215~214 Ma
      D3 ≤低绿片岩相(GS) 近N-S向宽缓褶皱及膝褶(赵靖等, 1994a, 1994b). 111.9±0.4 Ma
      D4 <低绿片岩相(GS) 褶劈理S2发生近E-W向宽缓褶皱,形成轴面劈理S4. 晚白垩世?
      D5 未变质 倾向W或SW的低角度韧-脆性正断层. 新生代?
      下载: 导出CSV

      表  3  幸福变质石英砂岩白云母40Ar-39Ar测年同位素比值结果

      Table  3.   40Ar-39Ar isotopic dating results of muscovite fractions from metamorphic quartz sandstone in Xingfu

      加热阶段 T
      (℃)
      (40Ar/
      39Ar)m
      (36Ar/
      39Ar)m
      (37Ar/
      39Ar)m
      (38Ar/
      39Ar)m
      40Ar
      (%)
      F 39Ar
      (10-14 mol)
      39Ar(累计)
      (%)
      年龄
      (Ma)
      ±1σ
      (Ma)
      Ca/
      K
      1 700 22.046 0 0.030 4 0.368 0 0.019 2 59.30 13.077 0 0.64 4.64 59.18 0.70 0.634 4
      2 740 18.946 9 0.003 8 0.351 9 0.014 1 94.11 17.835 2 1.57 16.01 80.23 0.81 0.606 6
      3 780 18.502 2 0.001 9 0.047 0 0.013 1 97.01 17.949 0 1.98 30.41 80.73 0.81 0.081 1
      4 820 18.833 7 0.001 8 0.064 8 0.012 9 97.16 18.299 5 2.46 48.27 82.28 0.81 0.111 8
      5 860 20.006 8 0.002 0 0.093 9 0.013 5 97.00 19.407 9 3.10 70.73 87.14 0.85 0.162 0
      6 900 20.941 3 0.003 4 0.134 2 0.013 6 95.22 19.942 9 1.01 78.08 89.48 0.91 0.231 3
      7 950 22.833 4 0.004 9 0.120 1 0.013 8 93.64 21.383 9 1.42 88.39 95.78 0.94 0.207 1
      8 1 000 24.860 4 0.005 7 0.184 4 0.013 9 93.31 23.200 0 1.16 96.80 103.70 1.00 0.317 9
      9 1 050 68.725 4 0.170 3 1.200 7 0.043 9 26.91 18.510 7 0.36 99.41 83.20 1.20 2.069 9
      10 1 120 88.314 7 0.215 0 2.233 2 0.055 7 28.24 24.981 6 0.08 100.00 111.40 4.10 3.850 1
      注:表中下标m代表样品中测定的同位素比值;Total age=85.8 Ma;F=40Ar*/39Ar,代表放射性40Ar和39Ar的比值.样品编号为7-20-6-DKW1,单矿物为白云母,W=27.73 mg,J=0.002 550.
      下载: 导出CSV
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