Geochemical characteristics, zircon U-Pb age of SSZ ophiolite in the Baiheshan area of the Beishan orogenic belt, Inner Mongolia, and its indication for the evolution of the Paleo-Asian Ocean
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摘要:
红石山-百合山蛇绿混杂岩带是北山造山带最北部的一条蛇绿混杂岩带，前人对百合山蛇绿岩的研究很少涉及。百合山蛇绿岩主要由变质橄榄岩、辉石橄榄岩、堆晶辉石岩、辉长岩、玄武岩等组成，对其中的辉长岩进行地球化学和锆石U-Pb年龄测试，以了解洋盆性质和形成时间。研究结果显示：辉长岩具有Al2O3、MgO含量高，P2O5含量低，富集大离子亲石元素、亏损高场强元素的特征，岩石初始87Sr/86Sr值为0.70418~0.70711，(143Nd/144Nd)i为0.512392~0.512568，εNd(t)值为+4.61~+7.28，反映岩浆物质来源于亏损地幔源区，形成过程受到俯冲消减流体的影响。辉长岩LA-MC-ICP-MS锆石U-Pb定年结果为344.6±1.8 Ma，岩石地球化学分析显示其属SSZ型(俯冲带型)蛇绿岩，形成于俯冲板片之上的不成熟弧后盆地环境，应为北侧雀儿山-圆包山岛弧基础上发育的早石炭世有限洋盆，代表了古亚洲洋在北山北部的分支洋盆。结合区域上广泛分布于百合山蛇绿混杂岩带南侧的晚石炭世—早二叠世白山岩浆弧特征，指示古亚洲洋在北山北部的演化至少持续到晚古生代晚期。
Abstract:The Hongshishan-Baiheshan ophiolite mélanges belt is the northernmost ophiolite mélanges belt in the Beishan area.However, most of the researchers have been focused on the Hongshishan ophiolite mélanges but paid very insufficient attention to the Baiheshan ophiolite.The authors analyzed geochemistry and zircon U-Pb chronology of gabbros in order to understand the ocean basin tectonic environment and formation time.The results show that gabbro has high content of Al2O3, MgO and LILE but poor content of P2O5 and HFSE.Meanwhile, the gabbro have bulk Sr-Nd isotope composition of (87Sr/86Sr)i=0.70418~0.70711, (143Nd/144Nd)i=0.512392~0.512568, and εNd(t)=+ 4.61~+ 7.28.These data show that the magma of gabbro might have come from depleted mantle source area and the formation process of gabbro was affected by the subduction fluid.The LA-MC-ICP-MS zircon U-Pb dating yielded a 206Pb/238U age of 344.6±1.8 Ma for the Baiheshan ophiolite.The petrogeochemical analysis shows that gabbro formed SSZ type ophiolites in the subducting plate above the immature back-arc basin.The result suggests that Baiheshan ophiolite mélanges belt might have been a Carboniferous limited ocean formed in the Queershan-Yuanbaoshan arc and may have been the branch ocean basin of the Paleo-Asian Ocean in the Beishan area.According to the studies of the Late Carboniferous-Early Permian Baishan magmatic arc located in the southern part of the Hongshishan-Baiheshan ophiolite mélanges belt, the authors hold that the evolution of the Paleo-Asian Ocean lasted at least to the end of the Late Paleozoic.
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Key words:
- Hongshishan-Baiheshan /
- ophiolite belt /
- gabbro /
- SSZ ophiolites /
- zircon U-Pb ages /
- back-arc basin
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表 1 百合山辉长岩(TW2005-3)LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1. LA-ICP-MS zircon U-Th-Pb dating results of the gabbro from Baiheshan ophiolite mélanges(TW2005-3)
测点 元素含量/10-6 同位素比值 年龄/Ma U Th 232Th/238U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ SAM.01 29 22 0.756 0.0557 0.0006 0.416 0.03 0.0542 0.004 350 4 353 29 SAM.02 1548 1772 1.144 0.0366 0.0004 0.259 0.004 0.0512 0.0006 232 2 234 3 SAM.03 32 28 0.884 0.0738 0.0009 2.347 0.07 0.231 0.006 459 5 1227 36 SAM.04 34 21 0.613 0.0553 0.0006 0.410 0.03 0.0537 0.004 347 4 349 26 SAM.05 1464 1032 0.705 0.0554 0.0005 0.413 0.005 0.0541 0.0006 348 3 351 5 SAM.06 38 34 0.897 0.0552 0.0006 0.416 0.03 0.0546 0.004 346 4 353 24 SAM.07 19 11 0.601 0.0554 0.0007 0.411 0.05 0.0538 0.008 348 4 350 47 SAM.08 26 18 0.686 0.0546 0.0006 0.407 0.04 0.0541 0.006 343 4 347 36 SAM.09 27 18 0.679 0.0551 0.0006 0.415 0.04 0.0545 0.005 346 4 352 32 SAM.10 27 20 0.727 0.0543 0.0006 0.406 0.04 0.0542 0.005 341 4 346 32 SAM.11 56 48 0.852 0.0553 0.0006 0.411 0.02 0.0539 0.002 347 4 349 16 SAM.12 16 12 0.708 0.0552 0.0008 0.414 0.07 0.0544 0.009 346 5 352 56 SAM.13 28 23 0.812 0.0542 0.0007 0.404 0.04 0.0539 0.005 341 4 344 34 SAM.14 142 77 0.544 0.0481 0.0005 0.353 0.009 0.0533 0.001 303 3 307 7 SAM.15 21 14 0.681 0.0541 0.0008 0.401 0.06 0.0538 0.008 340 5 343 53 SAM.16 66 50 0.759 0.0549 0.0006 0.409 0.02 0.0541 0.002 344 4 348 14 SAM.17 31 10 0.317 0.0553 0.0007 0.408 0.04 0.0536 0.005 347 4 347 32 SAM.18 80 60 0.751 0.0544 0.0006 0.409 0.02 0.0545 0.002 342 4 348 13 SAM.19 14 9 0.643 0.0582 0.0009 0.439 0.07 0.0546 0.009 365 5 369 60 SAM.20 29 2 0.0628 0.0542 0.0006 0.407 0.03 0.0544 0.005 340 4 346 29 SAM.21 361 389 1.0776 0.0659 0.0007 0.506 0.008 0.0557 0.0008 411 4 416 7 SAM.22 20 16 0.782 0.0551 0.0007 0.404 0.06 0.0532 0.008 346 4 345 48 SAM.23 388 141 0.363 0.0641 0.0006 0.490 0.008 0.0554 0.0008 400 4 405 6 SAM.24 898 1165 1.296 0.0377 0.0005 0.268 0.004 0.0514 0.0008 239 3 241 3 SAM.25 613 533 0.869 0.133 0.001 1.218 0.02 0.0667 0.0008 802 8 809 11 SAM.26 363 178 0.490 0.0586 0.0006 0.437 0.008 0.0541 0.0009 367 4 368 6 SAM.27 200 142 0.710 0.0426 0.0004 0.306 0.007 0.0520 0.001 269 3 271 6 SAM.28 201 314 1.560 0.0439 0.0004 0.319 0.01 0.0528 0.002 277 3 281 11 SAM.29 428 112 0.263 0.0694 0.0007 0.535 0.007 0.0559 0.0007 433 4 435 6 SAM.30 94 111 1.187 0.0545 0.0006 0.412 0.02 0.0548 0.003 342 3 350 16 SAM.31 254 187 0.736 0.0475 0.0005 0.343 0.006 0.0524 0.0008 299 3 300 5 SAM.32 155 102 0.655 0.0693 0.0007 0.539 0.01 0.0563 0.0009 432 4 437 8 
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表 2 百合山辉长岩主量、微量和稀土元素分析结果
Table 2. Major, trace elements and REE analyses for the gabbro from Baiheshan ophiolite mélanges
样号 YQ1059-1 YQ5004-1 YQ6208-1 YQ2005-3 PM01YQ46-1 PM01YQ37-1b PM01YQ39-1 SiO2 48.66 48.78 47.89 51.28 48.33 47.1 49.16 Al2O3 16.77 16.82 17.48 19.12 23.53 19.66 17.78 Fe2O3 1.53 2.61 1.23 1.83 1.11 2.38 2 FeO 2.75 3.79 2.83 3.28 0.99 3.68 3.86 CaO 14.95 14.4 13.12 11.27 14.27 12.97 12.95 MgO 10.09 8.93 10.72 7.03 5.6 8.82 8.94 K2O 0.044 0.062 0.79 0.18 0.25 0.15 0.16 Na2O 2.32 1.65 2.06 3.3 2.84 2 2.22 TiO2 0.12 0.26 0.13 0.15 0.08 0.22 0.18 P2O5 0.006 0.01 0.011 0.01 0.013 0.008 0.009 MnO 0.1 0.12 0.09 0.1 0.044 0.11 0.12 灼失量 2.36 2.15 3.34 2.08 2.84 2.5 2.19 总计 99.70 99.58 99.69 99.63 99.90 99.60 99.57 Mg# 81.34 72.17 82.92 71.78 83.39 72.98 73.79 TFeO 4.13 6.14 3.94 4.93 1.99 5.82 5.66 m/f 0.23 0.38 0.20 0.39 0.20 0.37 0.35 Cr 568 233 645 147 210 285 211 Ni 137 133 214 89.9 80.4 133 126 Co 31.3 38.5 31.5 34.1 20.5 39.8 35.6 Rb 4.9 5.8 30.2 9.7 11.7 7.3 9.2 Cs 0.38 0.21 2.58 0.4 1.44 0.85 0.76 Sr 94.2 113 111 116 118 146 141 Ba 8.73 14.9 64.4 21.6 15.7 21.1 18.2 V 130 164 110 107 51 128 145 Sc 26.7 28.6 23 23.4 10.3 22.6 26.9 Nb 0.067 0.073 0.14 0.68 0.072 0.1 0.12 Ta 0.025 0.026 0.032 0.055 0.036 0.052 0.043 Zr 1.64 3.83 3.17 10.5 0.91 3.61 3.03 Hf 0.083 0.19 0.14 0.43 0.04 0.17 0.14 Ga 8.4 11.6 8.08 11 10.9 11.3 11.7 U 0.17 0.071 0.079 0.14 0.076 0.026 0.058 Th 0.026 0.042 0.026 0.91 0.0066 0.012 0.14 La 0.086 0.37 0.17 0.99 0.049 0.22 0.43 Ce 0.34 0.9 0.48 3.57 0.2 0.72 0.74 Pr 0.067 0.19 0.09 0.58 0.035 0.14 0.18 Nd 0.45 1.11 0.57 3.05 0.26 0.92 1.01 Sm 0.19 0.48 0.25 1.08 0.1 0.4 0.41 Eu 0.13 0.25 0.1 0.32 0.12 0.27 0.22 Gd 0.31 0.67 0.34 1.52 0.15 0.53 0.57 Tb 0.073 0.16 0.076 0.32 0.031 0.12 0.13 Dy 0.59 1.09 0.57 2.27 0.25 0.88 1.01 Ho 0.14 0.26 0.13 0.5 0.056 0.2 0.22 Er 0.41 0.78 0.41 1.45 0.17 0.6 0.71 Tm 0.063 0.12 0.057 0.22 0.026 0.091 0.11 Yb 0.44 0.84 0.43 1.6 0.17 0.63 0.79 Lu 0.066 0.12 0.063 0.26 0.023 0.09 0.12 Y 3.5 6.54 3.41 13.4 1.48 5.26 6.12 ΣREE 3.36 7.34 3.74 17.73 1.64 5.81 6.65 LREE 1.26 3.30 1.66 9.59 0.76 2.67 2.99 HREE 2.09 4.04 2.08 8.14 0.88 3.14 3.66 LREE/HREE 0.60 0.82 0.80 1.18 0.87 0.85 0.82 LaN/YbN 0.14 0.32 0.28 0.44 0.21 0.25 0.39 δEu 1.64 1.35 1.05 0.76 3.00 1.79 1.39 δCe 1.10 0.83 0.95 1.16 1.18 1.01 0.65 注：Mg#=100*Mg2+/(Mg2++Fe2+); TFeO=FeO+Fe2O3*0.8998;m/f=(TFeO/72)/(MgO/40)；N为球粒陨石标准化值[29]；主量元素含量单位为%，微量和稀土元素含量单位为10-6
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表 3 百合山辉长岩全岩Sr-Nd同位素分析结果
Table 3. Sr-Nd dating results of the gabbro from Baiheshan ophiolite mélanges
原始样号 YQ1059-1 YQ5004-1 YQ6208-1 YQ2005-3 PM01YQ46-1 PM01YQ37-1b PM01YQ39-1 87Sr/86Sr 0.705454 0.704502 0.708445 0.704703 0.704661 0.704697 0.704527 143Nd/144Nd 0.513519 0.513431 0.51338 0.513264 0.513366 0.51341 0.5134 ISr 0.7052 0.70425 0.70711 0.70429 0.70418 0.70445 0.70421 INd 0.512568 0.512457 0.512392 0.512467 0.5125 0.512431 0.512486 εSr(t) 15.7 2.2 42.8 2.8 1.2 5 1.6 εNd(t) 7.28 5.12 3.85 5.31 5.95 4.61 5.68
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