A New Understanding of the "Macaoyuan Group" in North Kongling Area of Yangtze Craton
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摘要: 扬子陆核北崆岭地区孔子河-樟村坪一带的"马槽园群"被认为是崆岭地区唯一出露的青白口纪沉积记录,对探讨扬子陆块在Rodinia超大陆中的位置及汇聚与裂解过程具有重要意义.通过对其进行岩石学、沉积学和碎屑锆石年代学研究,并与紧密伴存的南沱组进行对比,结果表明:"马槽园群"与南沱组的空间分布、砾石大小、分选、磨圆等特征相似,都体现了快速混杂堆积特点;最年轻锆石年龄限定"马槽园群"沉积时代晚于786 Ma,南沱组则在657~635 Ma之间,两者具有相似的碎屑锆石年龄谱特征.由此表明北崆岭地区的这套杂砾岩为新元古代冰碛岩,可与区域上南沱组对比,同属Marinoan冰期产物,而不能以马槽园群称之;其沉积物源来自于邻近崆岭杂岩、黄陵花岗岩和神农架群.Abstract: The "Macaoyuan Group" in Kongzihe-Zhangcunping area, regarded as the sole sediment of Qingbaikou Period in North Kongling area, plays an important role to understanding the convergence and cracking of Rodinia Supercontinent. Here, new petrology, sedimentology, and detrital zircon chronology studies are conducted on 12 sections in Kongzihe-Zhangcunping area. The "Macaoyuan Group" is similar with the Nantuo Formation in the distribution and gravel features. The U-Pb ages of detridal zircon indicate the "Macaoyuan Group" is younger than 786 Ma, and the Nantuo Formation is constrained between 657 Ma and 635 Ma. The new findings indicate that the diamictite of "Macaoyuan Group" in North Kongling area is Neoproterozoic tillite, most likely time-equivalent to the Nantuo Formation. The sediment provenance is from the Kongling Group, Shennongjia Group and Huangling granite.
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Key words:
- Macaoyuan Group /
- Nantuo Formation /
- detrital zircon /
- sediment provenance /
- North Kongling area /
- stratigraphy
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图 1 研究区位置及地质背景简图
据熊成云等(2004)、胡正祥等(2012)、徐大良等(2016)修改
Fig. 1. Location and regional geological sketch of research area
图 3 樟村坪地区“马槽园群”和南沱组野外特征
a.PM010剖面,“马槽园群”(Pt3Mc)与下伏黄凉河岩组(Pt1H)角度不整合接触;b.PM008剖面,“马槽园群”(Pt3Mc)与上覆陡山沱组(Z1d)平行不整合,与下伏东冲河岩组(Ar3D)角度不整合接触;c.PM009剖面,南沱组(Nh3n)为黄绿色中厚层状含砾砂岩夹泥岩,“马槽园群”(Pt3Mc)为灰色块状杂砾岩;d.PM001剖面,“马槽园群”(Pt3Mc)与上覆陡山沱组(Z1d)平行不整合接触,岩性两分,下部为砂质胶结杂砾岩,上部为白云质胶结杂砾岩;e.PM011剖面,“马槽园群”(Pt3Mc)为灰色块状白云质胶结杂砾岩,砾石以白云岩和石英岩为主;f.PM008剖面,“马槽园群”(Pt3Mc)为泥砂质胶结杂砾岩,砾石成分包括白云岩、基性岩、变质岩、石英等
Fig. 3. Outcrop features of Macaoyuan Group and Nantuo Formation in Zhangcunping area
表 1 樟村坪地区PM010“马槽园群”和南沱组LA-ICP-MS锆石U-Pb年龄
Table 1. Zircon U-Pb isotope data obtained by LA-ICP-MS from Macaoyuan Group and Nantuo Formation in Zhangcunping area
测点 含量(10-6) Th/
U同位素比值 同位素年龄(Ma) 谐和度
(%)Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ PM010-2 02 184.8 164.7 507.2 0.32 0.119 0.003 5.120 0.217 0.324 0.005 1 936.1 48 1 839.5 36 1 807.5 23 98 03 169.7 140.6 451.5 0.31 0.117 0.003 5.337 0.203 0.341 0.005 1 922.2 11 1 874.8 33 1 891.6 23 99 04 63.8 46.3 86.1 0.54 0.206 0.005 16.165 0.569 0.586 0.008 2 871.3 38 2 886.6 34 2 974.1 34 97 06 61.5 285.9 396.2 0.72 0.066 0.002 1.180 0.039 0.132 0.002 809.3 57 791.3 18 801.8 9 98 07 63.2 189.7 439.4 0.43 0.063 0.002 1.126 0.036 0.132 0.001 701.9 62 765.7 17 800.7 8 95 08 29.5 354.2 125.1 2.83 0.063 0.003 1.134 0.047 0.132 0.002 705.6 77 769.4 22 800.2 10 96 10 44.7 69.6 99.1 0.70 0.119 0.003 6.027 0.159 0.372 0.004 1 938.9 46 1 979.8 23 2 039.8 20 97 12 189.9 234.7 356.6 0.66 0.157 0.003 9.627 0.187 0.444 0.005 2 428.1 30 2 399.7 18 2 366.9 21 98 13 21.6 103.4 136.1 0.76 0.068 0.003 1.200 0.050 0.130 0.002 861.1 87 800.8 23 786.9 11 98 15 132.3 138.1 240.3 0.57 0.158 0.003 9.731 0.175 0.447 0.006 2 438.9 28 2 409.7 17 2 381.3 24 98 17 17.3 52.0 104.8 0.50 0.070 0.003 1.396 0.050 0.146 0.002 931.5 79 887.4 21 880.7 12 99 19 41.9 138.1 275.2 0.50 0.067 0.002 1.227 0.036 0.132 0.001 847.8 59 813.0 16 798.8 8 98 20 79.7 47.2 103.3 0.46 0.222 0.004 18.487 0.330 0.602 0.006 2 997.2 28 3 015.4 17 3 037.8 24 99 23 29.7 99.6 190.8 0.52 0.068 0.002 1.231 0.039 0.132 0.002 866.4 36 814.5 18 798.0 9 97 24 107.1 119.8 174.2 0.69 0.188 0.003 12.293 0.218 0.475 0.006 2 724.1 28 2 627.0 17 2 506.9 26 95 25 13.5 49.5 86.5 0.57 0.070 0.004 1.230 0.060 0.132 0.002 927.8 11 814.3 27 799.1 13 98 26 11.9 25.9 23.6 1.09 0.117 0.006 5.823 0.250 0.368 0.008 1 917.0 83 1 949.8 37 2 020.6 37 96 27 91.1 68.9 162.1 0.42 0.156 0.003 9.890 0.177 0.460 0.005 2 416.7 31 2 424.5 17 2 437.8 22 99 29 187.5 103.0 362.8 0.28 0.159 0.003 9.502 0.159 0.432 0.004 2 447.2 26 2 387.7 15 2 313.9 17 96 30 86.1 205.4 166.3 1.23 0.130 0.003 6.335 0.141 0.354 0.004 2 098.2 39 2 023.4 20 1 952.7 17 96 31 87.5 212.7 171.1 1.24 0.122 0.003 5.951 0.122 0.353 0.003 1 991.1 37 1 968.7 18 1 949.1 16 98 32 95.9 55.2 179.6 0.30 0.156 0.003 9.610 0.164 0.447 0.004 2 416.7 34 2 398.1 16 2 380.3 18 99 33 154.9 132.1 206.0 0.64 0.213 0.003 16.668 0.267 0.567 0.005 2 929.3 24 2 915.9 15 2 893.7 19 99 35 73.4 87.4 179.5 0.49 0.122 0.002 5.777 0.105 0.345 0.003 1 979.3 33 1 942.9 16 1 909.0 14 98 36 44.1 169.9 292.1 0.58 0.065 0.002 1.180 0.031 0.131 0.001 787.0 56 791.5 14 795.4 8 99 37 17.2 47.5 37.6 1.26 0.116 0.005 5.165 0.201 0.326 0.005 1 898.2 68 1 846.8 33 1 818.4 25 98 38 59.0 186.5 120.9 1.54 0.122 0.003 5.678 0.118 0.337 0.003 1 991.1 37 1 928.1 18 1 871.0 16 96 39 14.0 75.6 83.0 0.91 0.064 0.007 1.1436 0.116 0.130 0.005 753.7 28 774.2 55 786.7 28 98 40 16.9 113.8 96.1 1.18 0.066 0.003 1.186 0.056 0.132 0.002 790.7 11 793.9 26 799.2 11 99 41 49.0 208.8 296.8 0.70 0.071 0.002 1.327 0.038 0.136 0.001 964.8 63 857.8 16 820.4 7 95 42 68.6 39.0 111.6 0.35 0.183 0.003 12.936 0.247 0.513 0.005 2 678.7 31 2 675.0 18 2 668.6 22 99 43 110.3 222.0 189.2 1.17 0.158 0.003 9.122 0.156 0.417 0.004 2 438.9 29 2 350.3 16 2 247.2 16 95 45 30.7 150.1 192.4 0.78 0.066 0.002 1.199 0.036 0.132 0.001 813.0 66 800.1 17 799.1 8 99 48 269.0 290.0 373.7 0.78 0.209 0.003 15.790 0.224 0.546 0.004 2 896.0 24 2 864.2 14 2 810.2 16 98 49 174.7 136.3 283.0 0.48 0.178 0.003 12.196 0.185 0.495 0.004 2 633.0 25 2 619.6 14 2 593.6 17 98 53 96.9 166.0 167.5 0.99 0.170 0.006 10.822 0.420 0.464 0.015 2 561.1 61 2 508.0 36 2 457.2 68 97 55 62.6 46.4 104.0 0.45 0.177 0.006 11.726 0.385 0.499 0.023 2 628.1 59 2 582.8 31 2 607.4 11 99 60 82.6 51.5 146.1 0.35 0.174 0.006 11.362 0.516 0.471 0.009 2 594.8 54 2 553.3 42 2 485.7 41 97 61 83.8 72.6 139.8 0.52 0.174 0.004 11.476 0.253 0.480 0.005 2 592.3 37 2 562.6 21 2 525.8 23 98 63 86.0 62.7 146.1 0.43 0.176 0.004 11.881 0.235 0.490 0.005 2 610.8 40 2 595.0 19 2 572.7 23 99 64 99.5 67.3 175.1 0.38 0.171 0.004 11.349 0.252 0.480 0.007 2 569.4 41 2 552.3 21 2 527.0 28 99 66 85.6 950.7 153.1 6.21 0.170 0.004 11.025 0.217 0.469 0.005 2 557.7 34 2 525.2 18 2 479.7 23 98 68 120.1 156.2 215.8 0.72 0.172 0.003 11.141 0.212 0.468 0.004 2 577.5 32 2 535.0 18 2 474.2 18 97 69 81.0 55.8 142.4 0.39 0.172 0.003 11.552 0.214 0.485 0.004 2 579.9 30 2 568.8 17 2 547.5 18 99 76 121.3 83.5 206.4 0.40 0.177 0.003 11.908 0.217 0.485 0.005 2 627.5 27 2 597.2 17 2 550.2 22 98 77 53.4 40.5 90.1 0.45 0.181 0.007 12.197 0.494 0.492 0.013 2 659.0 63 2 619.7 38 2 578.0 57 98 80 90.1 76.1 157.5 0.48 0.176 0.003 11.341 0.183 0.466 0.005 2 618.2 31 2 551.6 15 2 466.2 22 96 82 180.4 195.0 304.5 0.64 0.177 0.002 11.506 0.161 0.470 0.006 2 633.3 16 2 565.1 13 2 483.3 24 96 PM010-3 03 25.7 73.9 162.6 0.45 0.072 0.003 1.343 0.060 0.137 0.003 973.2 91 864.6 26 829.8 17 95 04 74.5 141.4 151.0 0.94 0.120 0.003 6.144 0.137 0.371 0.005 1 966.7 37 1 996.5 19 2 036.2 23 98 05 48.3 200.8 297.9 0.67 0.064 0.002 1.197 0.040 0.137 0.002 727.8 70 799.0 18 826.9 13 96 06 43.2 218.7 271.2 0.81 0.063 0.002 1.126 0.046 0.129 0.003 716.7 76 765.7 22 781.1 16 98 07 140 115.0 196.2 0.59 0.211 0.004 15.979 0.282 0.551 0.006 2 910.2 28 2 875.6 17 2 828.2 26 98 08 44.2 238.3 250.5 0.95 0.067 0.003 1.266 0.063 0.137 0.002 842.6 99 830.4 28 826.3 12 99 10 41.0 89.7 84.5 1.06 0.124 0.003 6.054 0.157 0.357 0.005 2 012.7 48 1 983.7 23 1 966.7 22 99 12 19.2 71.6 118.8 0.60 0.065 0.004 1.225 0.072 0.138 0.003 777.5 121 812.1 33 830.6 14 97 14 56.0 347.9 338.8 1.03 0.067 0.002 1.172 0.039 0.126 0.001 844.1 67 787.8 18 766.3 8 97 16 17.0 95.4 98.4 0.97 0.070 0.006 1.253 0.099 0.132 0.003 916.7 168 824.8 45 800.7 16 97 17 18.5 103.0 103.8 0.99 0.070 0.005 1.297 0.080 0.137 0.003 924.1 142 844.2 36 827.6 19 98 18 232 260.8 408.3 0.64 0.159 0.003 9.970 0.217 0.454 0.007 2 443.5 31 2 432.0 20 2 413.0 31 99 19 14.2 49.9 87.2 0.57 0.071 0.006 1.320 0.101 0.137 0.004 955.2 170 854.5 44 827.5 24 96 20 147 133.9 237.3 0.56 0.177 0.003 12.32 0.235 0.503 0.006 2 624.4 30 2 629.4 18 2 627.3 25 99 21 103 356.2 635.6 0.56 0.067 0.002 1.263 0.044 0.138 0.003 827.8 64 829.2 20 830.8 17 99 22 35.4 154.7 208.5 0.74 0.063 0.005 1.175 0.087 0.137 0.006 694.5 156 789.1 41 825.1 36 95 23 77.9 147.0 175.1 0.84 0.123 0.003 5.715 0.129 0.337 0.004 2 005.3 37 1 933.6 19 1 872.3 19 96 24 68.3 270.2 463.9 0.58 0.064 0.003 1.076 0.046 0.123 0.003 744.5 89 741.7 22 748.1 14 99 25 14.6 72.1 83.4 0.86 0.068 0.004 1.278 0.067 0.137 0.003 875.9 112 835.8 30 829.0 16 99 26 46.4 392.3 279.4 1.40 0.065 0.002 1.029 0.033 0.115 0.002 787.0 66 718.3 17 700.3 8 97 27 14.6 52.6 87.3 0.60 0.067 0.005 1.232 0.095 0.136 0.003 835.2 162 815.2 43 820.9 19 99 28 47.0 131.8 305.9 0.43 0.063 0.003 1.136 0.060 0.132 0.003 698.2 93 770.8 29 799.3 17 96 29 19.7 87.7 121.3 0.72 0.067 0.007 1.175 0.108 0.131 0.003 821.9 203 789.0 51 792.8 19 99 33 93.9 195.7 201.5 0.97 0.116 0.003 5.409 0.153 0.343 0.005 1 887.4 41 1 886.3 24 1 900.7 22 99 37 44.5 91.2 93.3 0.98 0.117 0.003 5.630 0.155 0.352 0.005 1 905.6 46 1 920.7 24 1 943.8 22 98 39 9.0 55.4 65.5 0.85 0.064 0.007 0.896 0.080 0.107 0.004 729.3 217 649.6 43 657.4 20 98 40 31.8 134.1 196.7 0.68 0.068 0.003 1.216 0.055 0.131 0.003 861.1 103 807.7 25 792.7 15 98 44 54.7 461.4 306.7 1.50 0.068 0.004 1.180 0.067 0.126 0.003 877.8 122 791.4 31 763.2 14 96 45 93.8 434.1 614.3 0.71 0.069 0.002 1.193 0.039 0.126 0.002 887.0 67 797.2 1 762.0 9 95 46 36.1 156.6 215.6 0.73 0.069 0.003 1.291 0.048 0.137 0.002 887.0 118 841.9 21 827.9 10 98 47 5.6 42.8 29.8 1.43 0.071 0.008 1.286 0.131 0.137 0.005 946.3 230 839.5 58 828.6 25 98 48 174 211.0 220.1 0.96 0.213 0.003 16.62 0.269 0.564 0.005 2 928.1 26 2 913.3 16 2 882.0 19 98 49 82.8 552.3 443.6 1.25 0.066 0.004 1.236 0.072 0.137 0.002 794.5 131 817.0 32 826.3 14 98 51 67.2 150.6 156.1 0.97 0.110 0.003 5.019 0.112 0.330 0.003 1 811.1 42 1 822.5 19 1 839.5 17 99 52 47.7 211.7 281.8 0.75 0.068 0.004 1.266 0.062 0.136 0.002 853.7 114 827.7 28 821.1 13 99 54 20.2 113.2 113.2 1.0 0.065 0.003 1.231 0.062 0.137 0.003 766.7 96 814.7 28 827.7 14 98 55 28.0 79.2 145.4 0.54 0.068 0.004 1.532 0.083 0.163 0.002 872.2 115 943.4 33 974.6 14 96 56 96.9 453.8 607.0 0.76 0.069 0.002 1.232 0.042 0.129 0.001 899.7 70 815.4 19 781.7 7 95 57 17.9 67.7 93.0 0.73 0.070 0.004 1.490 0.089 0.155 0.003 918.2 117 926.2 36 927.3 17 99 58 52.7 285.1 293.6 0.97 0.070 0.003 1.319 0.057 0.137 0.002 931.5 99 854.2 25 825.3 10 96 59 196 728.2 325.4 2.24 0.124 0.003 6.212 0.140 0.362 0.004 2 020.7 41 2 006.2 20 1 989.6 20 99 61 78.3 49.8 132.5 0.38 0.174 0.004 11.94 0.286 0.497 0.008 2 594.8 34 2 599.9 22 2 601.8 34 99 62 179 123.2 269.1 0.46 0.198 0.004 14.639 0.307 0.535 0.008 2 809.3 25 2 792.1 20 2 762.5 32 98 63 80.6 53.7 136.2 0.39 0.178 0.004 12.11 0.264 0.492 0.007 2 638.9 32 2 613.2 20 2 580.1 30 98 64 80.5 52.6 137.2 0.38 0.178 0.003 12.106 0.239 0.494 0.006 2 631.5 25 2 612.7 19 2 587.0 28 99 65 38.4 119.8 86.3 1.39 0.111 0.003 4.841 0.127 0.319 0.005 1 809.6 47 1 792.1 22 1 782.6 22 99 66 66.9 56.1 111.8 0.50 0.180 0.004 12.09 0.259 0.487 0.006 2 650.3 33 2 611.6 20 2 558.8 25 97 67 90.8 74.4 154.5 0.48 0.183 0.003 12.28 0.253 0.488 0.007 2 677.5 29 2 625.8 19 2 560.3 30 97 69 153 146.2 282.7 0.52 0.198 0.006 12.25 0.475 0.447 0.010 2 810.2 51 2 623.9 36 2 382.7 43 90 70 111 77.1 193.8 0.40 0.174 0.004 11.619 0.240 0.485 0.005 2 594.5 33 2 574.2 19 2 547.7 19 98 71 77.6 48.0 132.0 0.36 0.180 0.012 12.49 0.845 0.505 0.013 2 650.9 111 2 641.8 64 2 635.6 54 99 表 2 崆岭及神农架地区主要岩浆热事件年龄
Table 2. Main magmatic thermal events ages in the Kongling and Shengnongjia terrain
地点 岩石类型 年龄(Ma) 成因解释 方法 资料来源 北崆岭雾渡河—殷家坪 2 007±48~2 023±51 变质 LA-ICP-MS 北崆岭雾渡河—殷家坪 奥长花岗片麻岩 2 733±20 岩浆 LA-ICP-MS 北崆岭雾渡河—殷家坪 2 901±18~2 908±21 岩浆 LA-ICP-MS 北崆岭雾渡河—殷家坪 3 233±32~3 255±44 岩浆 LA-ICP-MS 北崆岭雾渡河—殷家坪 2 601±29~2 735±40 岩浆 LA-ICP-MS Chen et al. (2013) 北崆岭雾渡河—殷家坪 花岗片麻岩 2 901±27 岩浆 LA-ICP-MS 北崆岭雾渡河—殷家坪 3 231±34 岩浆 LA-ICP-MS 北崆岭雾渡河—殷家坪 英云闪长岩 1 995±45 变质 LA-ICP-MS 北崆岭雾渡河—殷家坪 2 957±17 岩浆 LA-ICP-MS 北崆岭龙头坪—野马洞 奧长花岗片麻岩 2 903±10, 2 947±5 岩浆 SHRIMP Qiu et al. (2000) 北崆岭龙头坪—野马洞 1 980±72 变质 LA-ICP-MS 北崆岭龙头坪—野马洞 混合岩 2 930±44~2 947±28 岩浆 LA-ICP-MS Zhang et al. (2006) 北崆岭龙头坪—野马洞 3 182±175~3 242±20 岩浆 LA-ICP-MS 北崆岭巴山寺 片麻岩 3 218±13 岩浆 LA-ICP-MS Jiao et al. (2009) 北崆岭雾渡河 花岗闪长片麻岩 1 981±16 变质 LA-ICP-MS 北崆岭雾渡河 2 950±15 岩浆 LA-ICP-MS Gao et al. (2011) 北崆岭雾渡河 3 262±27~3 302±8 岩浆 LA-ICP-MS 北崆岭野马洞 3 000±24 岩浆 LA-ICP-MS 北崆岭野马洞 斜长角闪岩包体 2 715±9 变质改造 LA-ICP-MS 魏君奇和王建雄(2012) 北崆岭野马洞 2 558±40 变质新生 LA-ICP-MS 北崆岭鳊鱼池沟 奥长花岗岩 3 292±33~3 313±20 岩浆 LA-ICP-MS 北崆岭鳊鱼池沟 黑云母花岗岩 1 951±35~2 040 变质 LA-ICP-MS 北崆岭鳊鱼池沟 2 662±20~2 810±49 岩浆 LA-ICP-MS 北崆岭鳊鱼池沟 2 888±18~3 367±17 继承 LA-ICP-MS Guo et al. (2015) 北崆岭鳊鱼池沟 二云母花岗岩 1 924±61~2 031±50 变质 LA-ICP-MS 北崆岭鳊鱼池沟 2 418±52~2 695±23 岩浆 LA-ICP-MS 北崆岭鳊鱼池沟 3 227±11~3 402±12 继承 LA-ICP-MS 北崆岭雾渡河—白竹坪 ~2 000 变质 LA-ICP-MS 北崆岭雾渡河—白竹坪 黑云石榴片麻岩 2 200~2 100 岩浆 LA-ICP-MS Li et al. (2016) 北崆岭雾渡河—白竹坪 2 400~2 200, >2 500 继承 LA-ICP-MS 神农架新华 玄武岩 1 103±8 火山岩浆 LA-ICP-MS Qiu et al.(2011) 南崆岭莲沱 奧长花岗岩 819±7 岩浆 SHRIMP 马国干等(1984) 南崆岭三斗坪—莲沱 花岗岩 837±7 岩浆 SHRIMP 高维和张传恒(2009) 南崆岭三斗坪—莲沱 莲沱组凝灰岩 724±12 火山 SHRIMP 北崆岭王家台—坦荡河 片麻岩,大理岩 2 000~2 009, 2 131~2 244, 2 595~2 849 变质继承 SHRIMP Yin et al. (2013) 南崆岭三斗坪—晓峰 英云闪长岩,二长花岗岩 842~863 岩浆 SHRIMP Wei et al. (2012) 南崆岭黄陵庙—大老岭—晓峰 花岗岩 800~820 岩浆 LA-ICP-MS Zhang et al. (2009) 南崆岭庙湾 辉长岩辉绿岩 978±12,1 001±16 岩浆 LA-ICP-MS Peng et al. (2012) 南崆岭庙湾 辉橄岩 1 063±12 岩浆 Sm-Nd 邱啸飞等(2015) 湖北长阳古城 凝灰岩 654.2±4.7 火山 SHRIMP Liu et al. (2015) -
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