Formation Age and its Geological Significance of Quartz Diorite from Cryptoexplosive Breccia in Dalucao Rare Earth Mine, Sichuan Province
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摘要:
四川德昌大陆槽稀土矿区广泛分布有隐爆角砾岩，主要为石英闪长岩。为限制石英闪长岩的形成年龄，本文开展了LA-ICP-MS锆石U-Pb年代学研究。结果显示，石英闪长岩锆石LA-ICP-MS U-Pb年龄为（751.7±4.6） Ma（n=39），代表了其成岩年代为新元古代，与扬子地块西缘和北缘大量的中酸性侵入体和火山岩具有相近的形成年龄。大陆槽隐爆角砾岩形成于地壳浅部，为稀土矿床的形成提供了通道与有利的保存条件，暗示大陆槽深部稀土找矿潜力大。
Abstract:To limit the diagenetic age of quartz diorite in the crypto-explosion breccia of the Dechang Dalucao in Sichuan Province, LA-ICP-MS zircon U-Pb chronology was carried out. The results show that the LA-ICP-MS U-Pb age of the Dalucao quartz diorite zircon is (751.7±4.6) Ma (n=39), indicating that the diagenetic age is Neoproterozoic, which is similar to the formation age of a large number of medium acid intrusions and volcanic rocks in the western and northern margins of the Yangtze Block. The Dalucao crypto-explosion breccia was formed in the shallow part of the crust, which provided a channel and favorable preservation conditions for the formation of rare earth deposits, suggesting that the deep part of the Dalucao has great potential for rare earth prospecting.
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Key words:
- Dechang /
- Dalucao /
- Quartz diorite /
- Zircon /
- Geological significance
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表 1 德昌大陆槽矿区DLC01样品的锆石的微量元素/（×10-6）
Table 1. Zircon trace element data of the DLC01 sample in Dalucao mining area of the Dechang region
测点 Ti La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ΣREE LREE HREE L/H LaN/
YbNδEu δCe 1 3.5 1.9 30.5 0.8 4.5 5.3 0.8 27.3 10.4 134.8 53.4 250 57 580 102 1 593 1 259 44 1215 0.04 0.00 0.17 6.2 2 3.1 4.6 36.2 1.7 9.1 4.1 0.6 20.5 7.9 102.8 41.3 197 44 450 77 1 201 996 56 940 0.06 0.01 0.16 3.1 3 4.2 1.7 25.1 0.6 3.2 2.5 0.3 12.9 5.1 68.8 28.9 147 36 404 76 905 812 33 779 0.04 0.00 0.15 6.3 5 4.2 2.8 25.8 0.9 4.9 3.4 0.5 14.8 5.7 73.4 31.0 157 39 419 82 979 861 38 822 0.05 0.00 0.18 4.1 6 11.6 1.3 20.4 0.4 2.7 3.5 0.6 17.5 6.2 76.3 29.8 134 30 294 53 869 670 29 641 0.05 0.00 0.18 6.9 7 7.1 2.5 19.6 1.0 7.3 7.3 2.2 32.4 11.8 144.2 56.7 262 59 605 111 1 672 1 323 40 1 283 0.03 0.00 0.37 3.0 8 4.4 9.9 41.4 2.9 13.4 4.4 0.5 14.5 5.3 71.4 30.4 154 37 402 82 942 868 72 796 0.09 0.02 0.17 1.9 9 12.0 0.0 13.4 0.1 1.2 2.5 0.5 14.4 5.6 68.1 26.7 123 27 270 50 800 603 18 586 0.03 0.00 0.18 72.1 10 2.7 6.1 26.1 1.7 7.8 2.6 0.3 7.0 2.8 39.1 16.9 87 21 229 46 528 493 45 449 0.10 0.02 0.17 2.0 11 4.0 12.1 50.0 3.9 19.6 6.1 0.7 19.1 6.6 85.1 34.7 168 38 388 75 1 044 907 92 815 0.11 0.02 0.17 1.8 12 13.3 1.1 23.9 0.3 2.0 2.2 0.4 13.2 5.3 73.6 31.3 157 37 401 79 973 828 30 798 0.04 0.00 0.18 10.0 13 12.8 0.2 13.8 0.1 0.8 1.9 0.3 11.2 4.5 56.7 23.1 107 24 236 44 680 524 17 507 0.03 0.00 0.18 36.4 14 4.0 21.0 82.2 7.0 32.8 10.2 0.9 26.9 9.2 112.3 45.2 214 48 483 92 1350 1 185 154 1 031 0.15 0.03 0.15 1.7 15 12.3 0.1 14.5 0.3 4.7 9.1 4.9 49.2 16.5 187.3 68.1 289 58 533 97 1 886 1 331 34 1 297 0.03 0.00 0.57 15.8 16 7.8 1.3 24.0 0.5 3.9 4.6 1.5 25.4 9.2 113.2 44.4 204 43 427 79 1 301 981 36 946 0.04 0.00 0.34 7.3 17 5.0 16.1 60.1 5.0 21.9 6.5 0.7 16.5 5.9 77.0 32.0 158 37 385 75 982 897 110 787 0.14 0.03 0.19 1.6 18 11.4 0.0 13.2 0.1 1.8 4.0 0.8 20.7 7.2 85.5 32.1 144 30 297 55 944 692 20 672 0.03 0.00 0.22 42.5 19 4.8 21.7 72.5 6.3 28.1 7.0 0.5 16.7 5.6 70.4 29.2 146 35 377 74 908 890 136 753 0.18 0.04 0.14 1.5 20 5.5 21.6 69.1 6.1 27.3 6.5 0.6 14.1 4.7 61.0 24.9 126 31 332 66 783 791 131 660 0.20 0.05 0.20 1.4 21 3.9 3.1 29.1 0.4 2.5 3.8 0.9 20.2 7.8 95.2 39.3 188 44 456 87 1 199 977 40 937 0.04 0.00 0.26 5.4 22 4.7 0.0 21.9 0.1 2.1 3.9 1.2 20.8 7.5 99.3 40.5 201 48 518 104 1 278 1 068 29 1 039 0.03 0.00 0.32 52.4 23 5.4 48.5 132.3 14.3 63.4 14.0 0.9 21.7 6.1 72.4 29.1 147 36 396 80 919 1 062 273 788 0.35 0.09 0.16 1.2 24 4.1 7.2 42.1 2.2 10.8 4.2 0.5 15.4 5.6 75.2 31.5 156 37 400 79 969 868 67 801 0.08 0.01 0.16 2.6 25 9.3 0.4 17.8 0.2 3.8 6.7 1.1 30.9 10.7 125.0 47.3 209 44 415 74 1 379 985 30 955 0.03 0.00 0.20 13.6 26 4.2 4.6 37.9 1.2 6.7 4.5 0.7 20.4 7.8 102.6 43.3 214 51 542 108 1 344 1 145 56 1 089 0.05 0.01 0.18 3.8 27 7.5 0.3 50.6 0.2 3.7 6.3 1.1 36.4 14.5 181.4 73.2 341 76 744 143 2 213 1 672 62 1 610 0.04 0.00 0.17 49.0 28 12.6 0.0 14.2 0.2 3.6 6.6 3.6 35.2 12.0 138.2 51.1 217 44 416 75 1 417 1 017 28 989 0.03 0.00 0.58 26.0 29 12.3 0.2 21.1 0.1 1.4 2.5 0.4 19.0 8.1 108.9 44.9 217 49 489 95 1 338 1 057 26 1 031 0.03 0.00 0.14 28.9 30 5.8 27.9 99.0 8.7 40.0 12.3 1.3 30.8 10.3 124.6 50.2 243 56 574 116 1 547 1 394 189 1 205 0.16 0.03 0.20 1.5 31 3.5 21.1 70.3 6.0 28.5 7.4 0.9 24.6 8.6 109.4 44.7 209 47 464 85 1 313 1 127 134 993 0.14 0.03 0.18 1.5 32 11.5 26.6 76.3 7.8 33.7 7.8 0.7 14.6 4.7 57.2 23.7 112 27 287 55 699 734 153 581 0.26 0.07 0.19 1.3 33 2.8 19.0 57.6 3.8 15.5 4.7 0.7 14.8 5.7 72.9 30.8 154 37 398 80 951 895 101 794 0.13 0.03 0.24 1.6 34 6.3 3.4 32.1 1.2 7.4 5.4 1.0 22.7 8.3 109.3 46.7 230 55 572 115 1 453 1 210 51 1 159 0.04 0.00 0.24 3.8 35 4.2 18.8 65.0 6.1 27.8 8.0 0.8 20.8 7.1 89.1 37.4 186 44 465 92 1 153 1 068 126 942 0.13 0.03 0.18 1.5 36 14.5 0.2 24.6 0.1 1.7 2.9 0.6 15.0 5.6 75.5 33.0 169 43 483 99 1 060 954 30 923 0.03 0.00 0.24 37.2 37 3.3 8.1 37.6 2.0 9.6 4.8 0.8 19.6 7.9 98.6 41.0 196 46 492 94 1 248 1 058 63 995 0.06 0.01 0.21 2.2 38 295.1 12.9 70.8 4.0 20.6 13.3 1.6 58.1 21.6 268.3 105.6 481 103 1 000 185 3 008 2 347 123 2 223 0.06 0.01 0.15 2.4 39 4.8 0.1 33.1 0.2 3.4 6.5 1.5 34.5 13.3 165.2 64.8 303 68 668 131 1 979 1 493 45 1 448 0.03 0.00 0.25 37.8 40 3.4 2.1 28.1 0.7 4.3 3.4 0.5 15.9 6.1 80.9 34.2 169 41 425 85 1 050 895 39 856 0.05 0.00 0.17 5.5 
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表 2 德昌大陆槽矿区DLC01样品LA-ICP-MS 锆石 U-Pb 年龄数据
Table 2. LA-ICP-MS zircon U-Pb isotopic age data of the DLC01 sample in Dalucao mining of the Dechang region
测点 Th U Th/U 同位素比值 同位素年龄/Ma 谐和率
/%T
/℃×10-6 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 234 256 0.91 0.065 56 0.001 59 1.119 47 0.026 94 0.123 86 0.002 51 792 50 763 13 753 14 99 657 2 130 213 0.61 0.065 45 0.001 67 1.131 72 0.028 53 0.125 42 0.002 56 789 53 769 14 762 15 99 646 3 149 189 0.79 0.064 68 0.001 59 1.099 78 0.026 78 0.123 33 0.002 50 764 51 753 13 750 14 100 670 4 39 117 0.33 0.063 97 0.002 21 1.082 76 0.036 72 0.122 76 0.002 62 741 71 745 18 746 15 100 570 5 156 187 0.83 0.064 98 0.001 62 1.123 19 0.027 64 0.125 36 0.002 55 774 51 765 13 761 15 100 671 6 78 107 0.73 0.064 45 0.001 78 1.097 41 0.029 95 0.123 49 0.002 54 757 57 752 15 751 15 100 760 7 130 129 1.01 0.064 02 0.001 68 1.095 68 0.028 39 0.124 13 0.002 54 742 55 751 14 754 15 100 715 8 131 165 0.79 0.064 97 0.001 64 1.157 95 0.028 85 0.129 27 0.002 63 773 52 781 14 784 15 100 675 9 49 63 0.78 0.064 49 0.002 07 1.104 73 0.034 98 0.124 24 0.002 62 758 66 756 17 755 15 100 764 10 46 82 0.56 0.065 24 0.002 41 1.109 57 0.040 31 0.123 36 0.002 68 782 76 758 19 750 15 99 636 11 124 160 0.78 0.064 29 0.001 64 1.103 83 0.027 87 0.124 53 0.002 54 751 53 755 13 757 15 100 666 12 140 189 0.74 0.065 68 0.001 72 1.104 38 0.028 58 0.121 95 0.002 49 796 54 756 14 742 14 98 774 13 48 69 0.70 0.064 94 0.002 03 1.113 19 0.034 25 0.124 32 0.002 61 773 64 760 16 755 15 99 770 14 227 241 0.94 0.065 82 0.001 63 1.134 35 0.027 82 0.124 98 0.002 54 801 51 770 13 759 15 99 667 15 102 80 1.27 0.065 91 0.001 99 1.122 23 0.033 36 0.123 49 0.002 58 803 62 764 16 751 15 98 766 16 178 173 1.03 0.067 09 0.001 72 1.146 89 0.029 10 0.123 98 0.002 53 841 53 776 14 753 15 97 723 17 172 201 0.85 0.064 21 0.001 62 1.098 08 0.027 30 0.12402 0.002 52 749 52 752 13 754 14 100 685 18 60 69 0.87 0.063 04 0.002 10 1.074 84 0.035 30 0.123 66 0.002 62 709 69 741 17 752 15 101 758 19 189 216 0.87 0.066 26 0.001 63 1.132 40 0.027 49 0.123 94 0.002 52 815 51 769 13 753 14 98 681 20 134 175 0.76 0.064 11 0.001 63 1.099 50 0.027 69 0.124 39 0.002 53 745 53 753 13 756 15 100 692 21 361 370 0.98 0.095 57 0.002 60 1.452 09 0.038 74 0.110 19 0.002 29 1 539 50 911 16 674 13 74 664 22 218 228 0.95 0.066 84 0.001 75 1.142 44 0.029 49 0.123 95 0.002 53 833 54 774 14 753 15 97 679 23 124 162 0.77 0.063 59 0.001 71 1.100 62 0.029 14 0.125 53 0.002 57 728 56 754 14 762 15 101 692 24 216 231 0.93 0.064 46 0.001 57 1.097 69 0.026 40 0.123 49 0.002 50 757 50 752 13 751 14 100 668 25 95 99 0.96 0.066 43 0.001 93 1.128 11 0.032 24 0.123 16 0.002 56 820 59 767 15 749 15 98 739 26 275 271 1.01 0.065 11 0.001 55 1.118 18 0.026 27 0.124 55 0.002 52 778 49 762 13 757 14 99 670 27 570 412 1.38 0.065 25 0.001 84 1.105 31 0.030 77 0.122 85 0.002 54 782 58 756 15 747 15 99 719 28 79 75 1.05 0.067 39 0.002 22 1.148 89 0.037 20 0.123 64 0.002 62 850 67 777 18 752 15 97 768 29 222 345 0.64 0.066 52 0.001 61 1.123 84 0.026 86 0.122 51 0.002 48 823 50 765 13 745 14 97 765 30 486 314 1.55 0.067 76 0.001 90 1.138 84 0.031 49 0.121 89 0.002 52 861 57 772 15 741 14 96 697 31 138 202 0.68 0.065 43 0.001 79 1.097 68 0.029 53 0.121 67 0.002 50 788 56 752 14 740 14 98 655 32 97 131 0.74 0.067 67 0.001 91 1.154 97 0.032 18 0.123 78 0.002 56 858 58 780 15 752 15 96 759 33 187 213 0.88 0.064 21 0.001 62 1.086 63 0.027 09 0.122 73 0.002 49 749 52 747 13 746 14 100 639 34 309 280 1.10 0.063 56 0.001 79 1.068 31 0.029 63 0.121 89 0.002 51 727 59 738 15 741 14 100 705 35 179 195 0.92 0.066 46 0.001 89 1.135 19 0.031 76 0.123 87 0.002 56 821 58 770 15 753 15 98 670 36 294 329 0.89 0.064 12 0.001 50 1.094 77 0.025 32 0.123 82 0.002 49 746 49 751 12 753 14 100 782 37 152 176 0.87 0.066 34 0.001 76 1.135 02 0.029 61 0.124 07 0.002 54 817 54 770 14 754 15 98 651 38 577 565 1.02 0.064 48 0.001 43 1.071 42 0.023 57 0.120 49 0.002 42 758 46 739 12 733 14 99 1208 39 413 275 1.50 0.064 00 0.001 92 1.082 22 0.031 89 0.122 62 0.002 55 742 62 745 16 746 15 100 681 40 206 196 1.05 0.064 40 0.001 66 1.093 29 0.027 83 0.123 10 0.002 51 755 54 750 14 748 14 100 654 注：T（℃）为锆石Ti温度计，参见文献[15]。
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