GEOCHRONOLOGY AND GEOCHEMISTRY OF THE EARLY CARBONIFEROUS GRANODIORITES IN HALADAOKOU AREA OF CHIFENG CITY: Geological Implication
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摘要:
以内蒙古赤峰哈拉道口地区花岗闪长岩为研究对象，利用锆石LA-ICP-MS U-Pb测年技术进行年代学研究，测试结果为352.4~355.9Ma，显示其形成时代为早石炭世早期，为华北板块北缘早石炭世岩浆岩活动研究提供了新的资料.地球化学特征显示，花岗闪长岩总体上贫Si、Al，总碱量偏高，Eu仅有轻微的亏损，属铝未饱和、高钾钙碱性系列岩石.同时花岗闪长岩具有较高Sr含量，较低的MgO、Y、Yb含量，富集LREEs，亏损HREEs和HFSEs，Sr/Y比值介于34.62~48.43之间，(La/Yb)N比值为15.31~17.14，显示"C型埃达克岩"特征.较高的K2O、Cr、Ni含量和较低的Mg#值说明其不可能是由拆沉下地壳物质的熔融形成，而是形成于增厚下地壳镁铁质岩的部分熔融.微量元素特征显示花岗闪长岩形成于活动大陆边缘弧环境.所以，早石炭世早期，本区处于古亚洲洋板块向南俯冲的大地构造背景.
Abstract:The geochronology of the granodiorites in Haladaokou area of Chifeng City, Inner Mongolia, is studied by zircon LA-ICP-MS U-Pb dating. The test result of 352.4-355.9 Ma indicates that the rocks were formed in the early stage of Early Carboniferous, which provides new data for the research of Early Carboniferous magmatic activity on the northern margin of North China Plate. Geochemically, the granodiorites are generally poor in Si and Al, with high total alkali content and slight Eu depletion, belonging to the Al-unsaturated, high-K calc-alkaline series. Moreover, the granodiorites have high Sr content and low MgO, Y and Yb contents, enrichment of LREEs and depletion of HREEs and HFSEs, with the Sr/Y ratio of 34.62-48.43 and (La/Yb)N ratio of 15.31-17.14, showing the characteristics of C-type adakite. The high K2O, Cr and Ni contents and low Mg# value reveal they cannot be formed by the melting of delamination of lower crust materials, but by the partial melting of thickened lower crust mafic rocks. The characteristics of trace elements indicate that the granodiorites were formed in the active continental margin arc environment. Therefore, the study area was in the geotectonic setting of southward subduction of Paleo-Asian Ocean plate during the early stage of Early Carboniferous.
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Key words:
- early stage of Early Carboniferous /
- granodiorite /
- geochronology /
- geochemistry /
- Inner Mongolia
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表 1 哈拉道口早石炭世花岗闪长岩LA-ICP-MS U-Pb分析结果
Table 1. LA-ICP-MS zircon U-Pb data for the Early Carboniferous granodiorites in Haladaokou area
样品号及分析点号 含量/10-6 Th/U 同位素比值±1σ 年龄/Ma ±1σ Pb Th U 207Pb/235U 206Pb/238U 207Pb/235U 206Pb/238U D1452-01 27 399 402 0.99 0.40055 0.01184 0.05460 0.00072 347 9 348 4 D1452-02 24 205 386 0.53 0.41924 0.01019 0.05550 0.00071 361 7 353 4 D1452-03 12 173 185 0.94 0.40235 0.01292 0.05518 0.00074 348 9 351 5 D1452-04 62 746 942 0.79 0.40307 0.00871 0.05568 0.00070 349 6 354 4 D1452-05 26 237 432 0.55 0.40542 0.00978 0.05507 0.00070 351 7 351 4 D1452-06 22 223 358 0.62 0.42352 0.01141 0.05559 0.00072 364 8 354 4 D1452-07 57 549 897 0.61 0.41918 0.00897 0.05608 0.00070 360 6 357 4 D1452-08 37 394 588 0.67 0.41206 0.00978 0.05593 0.00071 355 7 356 4 D1452-09 36 283 603 0.47 0.41678 0.01186 0.05491 0.00072 359 8 350 4 D1452-10 13 102 212 0.48 0.45911 0.01465 0.05637 0.00074 389 10 359 5 D1452-11 37 406 578 0.70 0.41766 0.00992 0.05611 0.00071 359 7 357 4 D1452-12 44 429 705 0.61 0.42363 0.00916 0.05542 0.00069 364 7 353 4 D1452-13 25 340 378 0.90 0.40663 0.01019 0.05564 0.00071 351 7 354 4 D1452-14 34 351 540 0.65 0.41228 0.00942 0.05586 0.00070 356 7 355 4 D1452-15 35 246 581 0.42 0.40397 0.00928 0.05576 0.00071 350 7 355 4 D1452-16 40 522 584 0.89 0.44040 0.01240 0.05575 0.00073 376 9 355 4 D1452-17 44 692 623 1.11 0.40709 0.00934 0.05517 0.00070 352 7 351 4 D1452-18 56 793 826 0.96 0.40747 0.00876 0.05556 0.00070 352 6 354 4 D1452-19 49 462 795 0.58 0.40230 0.00869 0.05501 0.00069 348 6 350 4 D1452-20 78 922 1197 0.77 0.40760 0.00866 0.05587 0.00070 352 6 355 4 D1452-21 73 834 1115 0.75 0.41071 0.00828 0.05560 0.00069 354 6 354 4 D1452-22 32 469 463 1.01 0.41457 0.00981 0.05585 0.00071 357 7 355 4 D3396-01 8 84 123 0.68 0.41882 0.01490 0.05657 0.00098 353 11 353 6 D3396-02 26 349 365 0.96 0.42047 0.01107 0.05687 0.00090 354 8 355 5 D3396-03 9 73 136 0.54 0.42106 0.01481 0.05700 0.00097 355 11 355 6 D3396-04 29 175 370 0.47 0.42370 0.01005 0.05723 0.00089 357 7 357 5 D3396-05 23 261 348 0.75 0.41674 0.01272 0.05615 0.00092 352 9 350 6 D3396-06 22 229 335 0.68 0.42028 0.01018 0.05684 0.00089 354 7 354 5 D3396-07 16 196 223 0.88 0.42097 0.01177 0.05690 0.00092 355 8 355 6 D3396-08 17 200 244 0.82 0.41754 0.01159 0.05640 0.00091 352 8 352 6 D3396-09 21 304 292 1.04 0.41491 0.01046 0.05623 0.00089 350 8 351 5 D3396-10 18 202 270 0.75 0.41256 0.01078 0.05585 0.00089 349 8 348 5 D3396-11 25 352 348 1.01 0.41574 0.01076 0.05631 0.00088 351 8 351 5 D3396-12 18 249 255 0.98 0.41897 0.01272 0.05656 0.00091 353 9 353 6 D3396-13 15 140 231 0.61 0.41376 0.01116 0.05594 0.00090 350 8 349 5 D3396-14 16 154 249 0.62 0.41424 0.01071 0.05602 0.00090 350 8 349 5 D3396-15 18 221 268 0.83 0.43146 0.01267 0.05653 0.00090 362 9 352 5 D3396-16 24 349 339 1.03 0.41211 0.01026 0.05590 0.00088 348 7 349 5 D3396-17 12 113 185 0.61 0.41522 0.01208 0.05623 0.00093 351 9 351 6 D3396-18 30 296 458 0.65 0.41820 0.01677 0.05630 0.00102 353 12 351 6 D3396-19 14 147 204 0.72 0.41689 0.01206 0.05629 0.00092 352 9 351 6 D3396-20 14 157 199 0.79 0.42099 0.01310 0.05686 0.00096 355 9 355 6 
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表 2 早石炭世花岗闪长岩主量元素分析结果
Table 2. Major element contents of the Early Carboniferous granodiorites
样品号 D1452-1 D1452-2 D1452-3 D1453-1 D1453-2 D3396-1 D3397-1 D3397-2 SiO2 64.93 64.62 64.54 64.18 63.67 63.20 63.74 64.32 TiO2 0.50 0.67 0.55 0.58 0.63 0.61 0.59 0.56 Al2O3 14.49 15.17 15.12 14.73 14.69 15.22 14.74 14.78 TFe2O3 4.36 4.84 4.39 4.55 5.32 4.89 4.82 4.34 FeO 2.03 2.74 2.29 2.61 2.97 2.92 2.65 2.38 MnO 0.10 0.08 0.07 0.08 0.09 0.09 0.08 0.07 MgO 1.69 2.20 2.06 2.10 2.56 2.32 2.21 2.01 CaO 3.15 3.90 3.13 3.34 3.47 3.71 3.34 3.35 Na2O 4.13 3.81 3.84 3.81 3.35 3.94 3.95 3.83 K2O 3.13 2.68 3.11 3.45 3.26 3.15 3.10 3.33 P2O5 0.14 0.18 0.17 0.16 0.17 0.19 0.17 0.18 LOI 3.14 2.01 3.11 3.16 2.58 2.86 3.37 3.34 Total 99.74 100.1 100.0 100.1 99.79 100.1 100.1 100.1 A/NK 1.42 1.66 1.56 1.47 1.63 1.54 1.50 1.49 A/CNK 0.91 0.93 0.98 0.92 0.96 0.92 0.93 0.92 Na2O+K2O 7.25 6.48 6.95 7.26 6.60 7.09 7.05 7.16 Na2O/K2O 1.32 1.42 1.23 1.11 1.03 1.25 1.27 1.15 AR 2.4 2.03 2.23 2.34 2.14 2.2 2.28 2.31 R1 1980 2098 2038 1926 2060 1854 1924 1975 R2 716 818 740 755 787 810 762 756 含量单位：10-6.
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表 3 早石炭世花岗闪长岩微量元素、稀土元素分析结果
Table 3. Trace and rare earth element contents of the Early Carboniferous granodiorites
样品号 D1452-1 D1452-2 D1452-3 D1453-1 D1453-2 D3396-1 D3397-1 D3397-2 La 24.04 41.81 26.85 32.17 30.18 26.67 27.60 29.65 Ce 43.54 79.12 53.77 63.48 56.57 53.73 54.46 57.22 Pr 4.40 8.39 6.05 7.01 5.91 6.03 6.05 6.25 Nd 15.32 29.08 21.39 24.98 20.90 21.88 21.57 21.88 Sm 2.80 4.82 3.69 4.26 3.67 3.81 3.69 3.69 Eu 0.83 1.25 1.09 1.21 0.84 1.08 1.07 1.09 Gd 2.35 3.66 2.93 3.39 3.03 2.99 2.92 2.97 Tb 0.35 0.57 0.44 0.54 0.42 0.48 0.45 0.46 Dy 1.90 3.06 2.43 2.89 2.26 2.55 2.44 2.43 Ho 0.38 0.61 0.48 0.55 0.44 0.50 0.48 0.47 Er 1.07 1.56 1.24 1.46 1.20 1.30 1.26 1.27 Tm 0.17 0.29 0.23 0.28 0.19 0.24 0.24 0.23 Yb 1.13 1.68 1.28 1.49 1.26 1.34 1.30 1.37 Lu 0.17 0.28 0.20 0.25 0.19 0.21 0.21 0.21 Y 11.66 16.09 12.62 14.68 13.27 13.25 13.00 12.88 ΣREE 98 176 122 143 127 122 123 129 LREE 90 164 112 133 118 113 114 119 HREE 7.52 11.72 9.24 10.84 9.00 9.61 9.30 9.41 L/H 12.10 14.04 12.21 12.28 13.12 11.78 12.31 12.72 (La/Yb)N 15.31 17.87 15.10 15.49 17.14 14.25 15.29 15.47 δEu 0.97 0.88 0.98 0.94 0.74 0.94 0.97 0.98 δCe 0.96 0.98 0.99 0.99 0.98 1.00 0.99 0.98 Sc 7.32 9.89 8.79 10.16 9.65 9.92 9.63 8.80 V 70.50 94.11 88.13 88.70 83.78 91.87 92.03 82.38 Cr 19.05 24.55 22.37 22.10 38.41 24.43 30.09 24.12 Co 11.07 13.82 11.92 12.85 12.70 14.21 14.16 10.91 Ni 17.79 16.42 16.31 16.64 22.84 17.56 18.62 16.37 Be 2.13 2.04 1.97 1.77 1.78 1.87 1.75 1.66 Rb 94 89 109 112 97 121 108 111 Sr 500 614 611 508 512 562 525 511 Ba 580. 433 558 601 549 484 587 547 Li 16.60 15.51 22.07 22.77 26.57 14.58 22.77 21.03 Zr 111 136 98 120 136 125 121 110 Nb 12.24 18.62 12.52 14.58 13.10 13.91 14.11 13.57 Hf 3.20 0.98 0.71 0.79 5.78 0.83 0.75 0.70 Ta 1.44 1.60 1.15 1.35 2.40 1.06 1.25 1.26 Th 8.39 12.95 12.62 9.61 18.54 6.68 9.81 8.94 U 1.47 3.55 2.68 2.33 2.20 2.15 2.18 1.89 Sr/Y 42.90 38.20 48.43 34.62 38.65 42.41 40.40 39.73 Zr+Nb+Ce+Y 179 250 177 213 219 206 203 194 含量单位：10-6.
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表 4 早石炭世花岗闪长岩与Maniar花岗岩类构造环境化学参数对比表
Table 4. Comparison of geochemical parameters by tectonic settings between the Early Carboniferous granodiorites and Maniar granites
类别 花岗闪长岩 岛弧花岗岩(IAG) 大陆弧花岗岩(CAG) 大陆碰撞花岗岩(CCG) 后造山花岗岩(POG) SiO2 63.67~64.93 60~68 62~76 70~76 70~78 钙碱指数 钙碱性 钙性-钙碱性 钙碱性 钙碱性-碱钙性 碱钙性 山德指数 偏铝质 偏铝质 偏铝质过铝质 过铝质 过铝质偏铝质 Na2O/CaO 0.96~1.31 1.0 4.0 2.0~10.0 2.0~18.0 Na2O/K2O 1.03~1.42 0.4~0.43 0.4~2.0 0.4~1.5 0.6~1.2 MgO/TFeO 0.39~0.48 0.3~0.85 0.10~0.50 0.05~0.6 0.02~0.3 MgO/MnO 17.38~29.80 12.0~28.0 2.0~38.0 2.0~45.0 2.0~18.0 Al2O3/(Na2O+K2O) 2.00~2.34 >1.5 >1.1 >1.1 0.9~1.4
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