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    上扬子西南盐源盆地早三叠世物源体系及构造意义

    朱民 陈汉林 周静 杨树锋

    朱民, 陈汉林, 周静, 杨树锋, 2016. 上扬子西南盐源盆地早三叠世物源体系及构造意义. 地球科学, 41(8): 1309-1321. doi: 10.3799/dqkx.2016.106
    引用本文: 朱民, 陈汉林, 周静, 杨树锋, 2016. 上扬子西南盐源盆地早三叠世物源体系及构造意义. 地球科学, 41(8): 1309-1321. doi: 10.3799/dqkx.2016.106
    Zhu Min, Chen Hanlin, Zhou Jing, Yang Shufeng, 2016. Provenance of Early Triassic in Yanyuan Basin, Upper Yangtze and Its Implication for the Tectonic Evolution. Earth Science, 41(8): 1309-1321. doi: 10.3799/dqkx.2016.106
    Citation: Zhu Min, Chen Hanlin, Zhou Jing, Yang Shufeng, 2016. Provenance of Early Triassic in Yanyuan Basin, Upper Yangtze and Its Implication for the Tectonic Evolution. Earth Science, 41(8): 1309-1321. doi: 10.3799/dqkx.2016.106

    上扬子西南盐源盆地早三叠世物源体系及构造意义

    doi: 10.3799/dqkx.2016.106
    基金项目: 

    国家科技重大专项项目 2016ZX05008-001

    国家科技重大专项项目 2016ZX05003-001

    详细信息
      作者简介:

      朱民(1984-),男,博士研究生,主要从事造山带与盆地构造研究.E-mail: 237623510@qq.com

    • 中图分类号: P531

    Provenance of Early Triassic in Yanyuan Basin, Upper Yangtze and Its Implication for the Tectonic Evolution

    • 摘要: 晚古生代末期至早中生代期间,上扬子西部边缘地区经历了峨眉山大火成岩省构造岩浆热事件和与古特提斯洋闭合相关的三江造山带形成事件,导致康滇古陆两侧形成了独特的盆山格局和沉积模式.由于目前人们对盐源盆地早三叠世青天堡组的物源与构造背景了解不多,故以盐源、盐塘剖面为代表,对青天堡组碎屑岩进行了砂岩组分、全岩地球化学和碎屑锆石年代学分析.结果显示,盐源盆地下三叠统青天堡组物源来自于近源搬运的火山岩,青天堡组与峨眉山大火成岩省的高钛玄武岩具有一致的元素组合配分模式,青天堡组锆石谐和加权平均年龄为261±16 Ma,与峨眉山大火成岩省形成的地幔柱活动时期一致.上述结果表明早三叠世盐源盆地青天堡组物源为其东侧的峨眉山大火成岩省,扬子西部三江造山带可能并没有为盐源盆地提供物源,上扬子西南边缘地区早三叠世时期仍然为被动大陆边缘沉积.

       

    • 图  1  盐源及邻区地质简图

      四川省地质矿产局(1972)许志琴等(1992)Metcalfe(2013)Munteanu et al.(2013)修改

      Fig.  1.  Simplified tectonic sketch of the Yanyuan region and adjacent regions

      图  2  盐源盆地盐塘地区早三叠世青天堡组实测地层剖面

      Fig.  2.  Stratigraphic column and outcrop photograph of Early Triassic Qingtianbao Fonnation in Yantang area

      图  3  青天堡组砂岩样品dh-41(a)和dh-42(b)显微镜下正交偏光特征

      Kfs.钾长石;P.斜长石;Qm.单晶石英;Lsc.碳酸盐岩屑;Cl.粘土质岩屑:Lvl.火山玻璃:Lvm.微晶状火山岩屑

      Fig.  3.  Microphotographs of the Qingtianbao Formation for samples dh-41 (a) and dh-42 (b)

      图  4  青天堡组砂岩主量元素A(Al2O3)-CN(CaO*+Na2O)-K(K2O)(a)及微量元素Th/U-Th关系(b)

      图a据Nesbitt and Young(1982);图b据McLennan(1993),UCC和PAAS据Taylor and McLennan(1985)

      Fig.  4.  Geochemical relations of A(Al2O3)-CN(CaO*+Na2O)-K(K2O) (a) and Th/U-Th (b) for the sandstones in Qingtianbao Formation

      图  5  盐源盆地青天堡组砂岩的Al2O3/TiO2-Eu/Eu* (a)及Th/Sc-Zr/Sc (b)关系

      峨眉山高钛玄武岩数据据Xu et al.(2001)Xiao et al.(2004)Fan et al.(2008)Zi et al.(2010);UCC据Taylor and McLennan(1985)

      Fig.  5.  Geochemical relations of Al2O3/TiO2-Eu/Eu* (a) and Th/Sc-Zr/Sc (b) for the sandstones in Qingtianbao Formation

      图  6  样品微量元素原始地幔标准化蛛网图(a)和稀土元素球粒陨石标准化配分图(b)

      原始地幔和球粒陨石标准化值据Sun and McDonough(1989),UCC据Taylor and McLennan(1985),弧相关火成岩值引自Omrani et al.(2008),峨眉山流纹岩值据Shellnutt and Jahn(2010)Xu et al.(2010)

      Fig.  6.  Primitive mantle normalized trace elements spider-diagram (a) and chondrite normalized REE diagram (b)

      图  7  盐源盆地盐塘地区下三叠统青天堡组砂岩样品Z5-29-2碎屑锆石LA-ICP-MS年龄分布峰值(a)和谐和图(b)以及典型锆石颗粒阴极发光照片(c)

      Fig.  7.  Probability density distribution curves of ages showing the results of the LA-ICP-MS dating of detrital zircons (a), LA-ICP-MS zircon U-Pb concordia diagrams (b) and representative cathode-luminescence (CL) (c) for sample Z5-29-2 from Yantang

      图  8  早三叠世盐源盆地岩相古地理(a)及构造演化(b, c)

      四川省地质矿产研究所(1987)修改,图 8a中箭头表示物源方向,五角星表示样品位置

      Fig.  8.  The lithofacies and paleogeographic sketch (a) and the tectonic evolution (b, c) of Yanyuan region in Early Triassic

      表  1  早三叠世青天堡组样品主量(%)、微量、稀土元素含量(10-6)

      Table  1.   Major elements (%), trace elements and rare earth elements (10-6) of Early Triassic Qingtianbao Formation

      样品 dh-39 dh-41 dh-42 dh-43
      SiO2 57.62 49.98 51.50 49.99
      TiO2 1.56 1.37 2.72 2.66
      Al2O3 10.63 9.21 14.19 13.10
      Fe2O3 10.90 6.19 12.22 14.94
      MnO 0.15 0.23 0.15 0.14
      MgO 8.94 3.15 5.58 7.52
      CaO 1.34 13.52 2.75 2.28
      Na2O 1.12 2.97 4.78 3.89
      K2O 1.49 1.00 0.48 0.40
      P2O5 0.17 0.16 0.30 0.29
      LOI 5.54 12.01 5.06 4.58
      Total 99.47 99.80 99.73 99.78
      CIA 66.74 45.87 52.83 56.01
      Al2O3/TiO2 6.81 6.71 5.21 4.93
      La 184.51 192.80 152.79 202.06
      Ce 165.05 112.90 97.63 133.32
      Pr 163.46 121.07 103.86 142.77
      Nd 130.02 95.09 84.08 116.89
      Sm 81.17 58.36 53.22 77.19
      Eu 73.45 46.93 36.85 62.33
      Gd 55.12 41.29 38.14 51.91
      Tb 45.05 36.83 36.72 46.61
      Dy 25.94 25.71 28.35 31.89
      Ho 17.99 21.32 24.53 25.66
      Er 16.23 20.23 23.07 23.91
      Tm 11.49 20.20 24.26 23.30
      Yb 10.37 18.18 21.91 20.87
      Lu 9.41 18.02 22.49 21.21
      Li 11.80 18.08 27.59 52.18
      Be 3.36 2.36 1.74 2.63
      Sc 18.16 18.22 32.00 30.18
      Ti 12 370.69 8 003.09 12 091.75 13 221.84
      V 121.40 63.28 170.41 166.65
      Cr 79.21 200.91 202.64 184.92
      Mn 1 465.92 2 290.52 1 264.86 1 185.01
      Co 60.95 40.07 68.49 70.83
      Ni 154.94 87.31 163.61 173.97
      Cu 86.32 60.14 55.30 62.90
      Zn 74.51 39.17 68.27 78.08
      Ga 28.52 17.06 27.80 27.42
      Rb 46.26 35.14 18.03 15.44
      Sr 1 198.08 126.80 109.34 188.96
      Y 24.59 30.32 35.04 35.25
      Zr 357.32 366.06 414.86 363.04
      Nb 83.88 46.55 42.60 46.91
      Mo 3.90 0.71 0.63 0.82
      Sn 2.51 2.50 2.89 2.73
      Cs 0.72 0.72 0.65 0.76
      Ba 428.86 438.38 242.34 458.44
      Hf 9.52 10.99 12.49 11.13
      Ta 5.37 2.72 2.40 2.77
      W 0.45 19.43 4.85 8.88
      Pb 8.49 13.26 7.35 25.38
      Th 7.00 7.16 7.45 6.11
      U 1.61 1.58 1.54 1.27
      下载: 导出CSV

      表  2  早三叠世青天堡组碎屑锆石U-Pb年龄测试结果

      Table  2.   U-Pb ages of detrital zircon grains for Qingtianbao Formation in Yantang region

      测点号 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ 年龄(Ma) Th(10-6) U(10-6) Th/U
      207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ
      5-29-2-01 0.052 0 0.001 8 0.306 7 0.009 28 0.042 9 0.000 62 0.013 1 0.000 21 284 43 272 7 271 4 264 4 123.02 132.10 0.93
      5-29-2-02 0.052 7 0.003 5 0.310 8 0.020 20 0.042 8 0.000 69 0.013 4 0.000 15 317 155 275 16 270 4 269 3 102.32 104.73 0.98
      5-29-2-03 0.054 0 0.002 0 0.318 6 0.010 75 0.042 9 0.000 64 0.013 2 0.000 22 371 49 281 8 271 4 266 4 129.65 122.21 1.06
      5-29-2-04 0.051 6 0.002 7 0.305 7 0.015 58 0.043 0 0.000 65 0.013 5 0.000 16 266 125 271 12 271 4 271 3 65.27 110.15 0.59
      5-29-2-05 0.050 0 0.002 3 0.284 5 0.012 19 0.041 3 0.000 63 0.013 0 0.000 24 196 71 254 10 261 4 261 5 86.10 91.57 0.94
      5-29-2-06 0.050 3 0.001 4 0.281 4 0.006 59 0.040 7 0.000 57 0.012 1 0.000 18 207 29 252 5 257 4 244 4 177.35 256.99 0.69
      5-29-2-07 0.046 3 0.001 2 0.256 5 0.005 69 0.040 3 0.000 55 0.012 6 0.000 16 13 26 232 5 254 3 253 3 292.98 304.69 0.96
      5-29-2-08 0.053 6 0.002 1 0.302 8 0.010 99 0.041 1 0.000 62 0.012 4 0.000 23 353 55 269 9 259 4 249 5 80.56 85.88 0.94
      5-29-2-09 0.047 6 0.001 8 0.269 0 0.009 10 0.041 0 0.000 60 0.012 2 0.000 20 80 52 242 7 259 4 244 4 119.04 122.45 0.97
      5-29-2-10 0.054 9 0.001 8 0.322 2 0.009 47 0.042 6 0.000 62 0.013 0 0.000 21 409 40 284 7 269 4 261 4 120.75 127.77 0.95
      5-29-2-11 0.047 2 0.001 5 0.271 2 0.007 40 0.041 7 0.000 59 0.013 3 0.000 21 61 38 244 6 263 4 267 4 110.10 172.22 0.64
      5-29-2-14 0.051 2 0.003 5 0.295 3 0.019 77 0.041 9 0.000 67 0.013 2 0.000 15 248 159 263 15 264 4 265 3 161.43 135.73 1.19
      5-29-2-15 0.054 9 0.002 1 0.315 9 0.011 15 0.041 8 0.000 64 0.012 9 0.000 24 410 52 279 9 264 4 259 5 80.42 83.29 0.97
      5-29-2-16 0.050 3 0.001 4 0.311 4 0.007 64 0.045 0 0.000 63 0.014 9 0.000 22 208 32 275 6 284 4 300 4 135.73 196.75 0.69
      5-29-2-17 0.050 9 0.002 1 0.296 2 0.011 20 0.042 3 0.000 64 0.012 8 0.000 24 236 59 263 9 267 4 257 5 77.36 84.98 0.91
      5-29-2-18 0.053 5 0.001 8 0.302 0 0.009 31 0.041 0 0.000 60 0.012 9 0.000 22 351 43 268 7 259 4 259 4 97.42 114.94 0.85
      5-29-2-19 0.050 5 0.001 5 0.286 5 0.007 59 0.041 2 0.000 58 0.013 3 0.000 18 217 36 256 6 260 4 266 4 210.55 190.54 1.11
      5-29-2-20 0.055 0 0.002 6 0.296 1 0.013 30 0.039 0 0.000 58 0.012 2 0.000 15 414 109 263 10 247 4 245 3 101.86 168.55 0.60
      5-29-2-21 0.054 3 0.002 3 0.311 3 0.012 41 0.041 6 0.000 63 0.012 7 0.000 30 382 62 275 10 263 4 256 6 52.27 82.81 0.63
      5-29-2-22 0.047 6 0.001 7 0.272 3 0.008 52 0.041 5 0.000 59 0.012 7 0.000 23 79 47 245 7 262 4 256 5 88.74 142.23 0.62
      5-29-2-23 0.060 7 0.002 6 1.126 2 0.044 99 0.134 6 0.002 09 0.041 0 0.000 62 630 59 766 21 814 12 812 12 52.88 27.64 1.91
      5-29-2-24 0.051 7 0.002 2 0.291 8 0.011 21 0.040 9 0.000 64 0.013 0 0.000 26 273 59 260 9 259 4 262 5 74.29 80.21 0.93
      5-29-2-25 0.052 7 0.003 7 0.296 9 0.020 33 0.040 8 0.000 67 0.012 8 0.000 15 317 163 264 16 258 4 257 3 86.47 87.03 0.99
      5-29-2-26 0.049 1 0.001 9 0.283 6 0.010 31 0.042 0 0.000 61 0.011 7 0.000 23 151 58 253 8 265 4 235 5 93.76 115.68 0.81
      5-29-2-27 0.054 1 0.002 2 0.308 7 0.011 53 0.041 4 0.000 62 0.014 0 0.000 25 377 57 273 9 261 4 281 5 85.32 94.70 0.90
      5-29-2-30 0.055 1 0.001 7 0.316 2 0.008 68 0.041 7 0.000 59 0.013 0 0.000 22 415 36 279 7 263 4 261 4 101.62 149.33 0.68
      5-29-2-31 0.050 2 0.001 7 0.274 3 0.008 32 0.039 6 0.000 56 0.012 6 0.000 19 204 44 246 7 251 3 252 4 174.30 158.09 1.10
      5-29-2-32 0.047 7 0.002 2 0.273 0 0.011 92 0.041 5 0.000 62 0.012 8 0.000 28 85 71 245 10 262 4 258 6 54.31 90.19 0.60
      5-29-2-33 0.048 9 0.001 6 0.272 7 0.007 87 0.040 5 0.000 57 0.012 7 0.000 21 141 42 245 6 256 4 254 4 105.53 166.43 0.63
      5-29-2-34 0.055 9 0.001 8 0.322 2 0.008 83 0.041 8 0.000 59 0.012 9 0.000 20 447 36 284 7 264 4 260 4 154.26 152.35 1.01
      5-29-2-35 0.049 8 0.001 8 0.270 5 0.008 62 0.039 4 0.000 56 0.012 1 0.000 20 188 48 243 7 249 3 244 4 133.89 164.26 0.82
      5-29-2-36 0.047 1 0.001 7 0.269 8 0.008 62 0.041 6 0.000 59 0.012 8 0.000 21 54 46 243 7 262 4 256 4 115.31 137.20 0.84
      5-29-2-37 0.052 8 0.001 5 0.297 2 0.007 35 0.040 9 0.000 57 0.012 7 0.000 19 318 32 264 6 258 4 255 4 165.22 226.74 0.73
      5-29-2-38 0.048 8 0.001 6 0.268 4 0.008 04 0.039 9 0.000 56 0.012 8 0.000 19 136 44 241 6 252 3 257 4 167.87 176.60 0.95
      5-29-2-39 0.052 6 0.004 1 0.299 2 0.022 52 0.041 3 0.000 70 0.013 0 0.000 17 311 177 266 18 261 4 260 3 93.11 143.32 0.65
      5-29-2-40 0.054 8 0.002 7 0.301 1 0.014 16 0.039 8 0.000 59 0.012 4 0.000 15 406 113 267 11 252 4 250 3 129.70 204.40 0.63
      5-29-2-41 0.050 5 0.001 5 0.299 8 0.007 35 0.043 0 0.000 59 0.013 4 0.000 20 219 32 266 6 271 4 269 4 162.85 221.78 0.73
      5-29-2-42 0.048 3 0.002 9 0.272 4 0.015 74 0.040 9 0.000 67 0.011 8 0.000 29 114 99 245 13 258 4 237 6 46.25 52.78 0.88
      5-29-2-43 0.052 6 0.001 8 0.295 0 0.009 09 0.040 7 0.000 58 0.013 8 0.000 21 312 44 262 7 257 4 276 4 145.09 149.77 0.97
      5-29-2-45 0.045 9 0.002 3 0.256 5 0.011 97 0.040 6 0.000 61 0.013 8 0.000 27 -10 70 232 10 256 4 278 5 65.53 85.16 0.77
      5-29-2-46 0.051 2 0.001 5 0.288 5 0.007 17 0.040 8 0.000 56 0.012 9 0.000 16 250 33 257 6 258 3 258 3 420.95 227.36 1.85
      5-29-2-47 0.054 9 0.004 3 0.319 7 0.024 19 0.042 3 0.000 72 0.013 2 0.000 16 406 179 282 19 267 4 265 3 80.09 86.46 0.93
      5-29-2-48 0.055 5 0.002 3 0.312 0 0.012 02 0.040 8 0.000 61 0.014 1 0.000 26 432 59 276 9 257 4 282 5 75.11 90.71 0.83
      5-29-2-49 0.056 5 0.003 9 0.312 3 0.020 71 0.040 1 0.000 65 0.012 5 0.000 15 472 156 276 16 253 4 250 3 95.15 95.78 0.99
      5-29-2-50 0.054 7 0.002 1 0.314 2 0.011 10 0.041 6 0.000 60 0.013 2 0.000 22 400 53 277 9 263 4 265 4 106.90 112.74 0.95
      5-29-2-51 0.050 6 0.001 7 0.294 2 0.008 39 0.042 2 0.000 59 0.013 6 0.000 19 222 40 262 7 266 4 273 4 190.22 163.69 1.16
      5-29-2-53 0.056 7 0.001 8 0.324 9 0.008 82 0.041 6 0.000 58 0.013 2 0.000 22 478 36 286 7 262 4 265 4 104.95 178.72 0.59
      5-29-2-54 0.053 4 0.001 7 0.316 3 0.008 63 0.043 0 0.000 60 0.012 5 0.000 22 345 37 279 7 271 4 251 4 109.31 160.09 0.68
      5-29-2-55 0.052 4 0.003 5 0.295 9 0.019 47 0.040 9 0.000 64 0.012 9 0.000 14 304 156 263 15 259 4 258 3 315.93 233.36 1.35
      5-29-2-56 0.056 6 0.003 6 0.319 4 0.019 93 0.040 9 0.000 64 0.012 7 0.000 15 476 146 281 15 259 4 256 3 146.85 137.78 1.07
      5-29-2-57 0.054 6 0.002 3 0.314 2 0.012 28 0.041 7 0.000 62 0.012 4 0.000 25 395 61 277 9 263 4 248 5 71.35 91.99 0.78
      5-29-2-58 0.066 3 0.001 6 1.136 4 0.020 26 0.124 1 0.001 66 0.038 7 0.000 48 817 18 771 10 754 10 768 9 206.56 154.28 1.34
      5-29-2-60 0.051 7 0.002 5 0.296 3 0.013 22 0.041 5 0.000 63 0.013 3 0.000 27 271 74 263 10 262 4 266 5 67.93 83.35 0.81
      5-29-2-61 0.073 7 0.001 7 1.595 8 0.026 83 0.157 0 0.002 09 0.048 7 0.000 66 1032 16 969 10 940 12 962 13 75.34 144.72 0.52
      5-29-2-62 0.052 9 0.001 4 0.306 0 0.006 25 0.041 9 0.000 56 0.013 1 0.000 16 324 24 271 5 265 3 263 3 618.74 379.78 1.63
      5-29-2-63 0.053 4 0.001 4 0.306 1 0.006 55 0.041 5 0.000 56 0.013 3 0.000 17 347 25 271 5 262 3 267 3 347.42 328.74 1.06
      5-29-2-64 0.048 7 0.001 4 0.300 1 0.007 26 0.044 7 0.000 61 0.014 7 0.000 19 132 32 266 6 282 4 295 4 378.04 259.95 1.45
      5-29-2-65 0.054 3 0.002 8 0.331 2 0.015 85 0.044 2 0.000 69 0.013 9 0.000 30 385 79 290 12 279 4 279 6 56.57 63.95 0.88
      5-29-2-67 0.052 1 0.001 8 0.290 5 0.008 79 0.040 4 0.000 57 0.012 6 0.000 19 289 44 259 7 255 4 252 4 158.49 163.36 0.97
      5-29-2-68 0.072 1 0.002 6 1.329 1 0.043 92 0.133 7 0.001 92 0.040 4 0.000 52 988 75 858 19 809 11 801 10 37.84 74.16 0.51
      5-29-2-70 0.051 0 0.002 4 0.279 9 0.012 06 0.039 8 0.000 60 0.012 8 0.000 26 239 71 251 10 251 4 256 5 64.46 82.25 0.78
      5-29-2-71 0.052 3 0.001 5 0.294 2 0.007 22 0.040 7 0.000 56 0.012 8 0.000 18 300 32 262 6 257 3 256 4 214.64 232.63 0.92
      5-29-2-72 0.051 2 0.002 2 0.294 2 0.011 75 0.041 6 0.000 61 0.013 1 0.000 22 248 65 262 9 263 4 262 4 108.66 107.31 1.01
      5-29-2-73 0.049 2 0.001 5 0.272 9 0.007 07 0.040 2 0.000 55 0.013 2 0.000 18 156 36 245 6 254 3 264 4 287.86 241.50 1.19
      5-29-2-74 0.048 4 0.002 1 0.281 6 0.011 43 0.042 2 0.000 63 0.013 3 0.000 28 117 67 252 9 266 4 267 6 67.12 98.99 0.68
      5-29-2-75 0.056 4 0.003 0 0.312 7 0.015 59 0.040 2 0.000 64 0.014 5 0.000 34 466 82 276 12 254 4 291 7 43.86 60.50 0.72
      5-29-2-77 0.048 8 0.002 4 0.270 0 0.012 31 0.040 1 0.000 60 0.012 4 0.000 22 137 78 243 10 253 4 249 4 100.17 88.61 1.13
      5-29-2-79 0.045 7 0.001 8 0.258 7 0.009 38 0.041 0 0.000 58 0.013 2 0.000 21 -18 48 234 8 259 4 265 4 127.75 146.13 0.87
      5-29-2-80 0.047 6 0.002 3 0.266 5 0.011 84 0.0406 0.000 60 0.013 6 0.000 25 77 71 240 9 256 4 274 5 88.36 95.69 0.92
      下载: 导出CSV
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