An analysis of Zircon U-Pb age, geochemistry and tectonic setting of Dongfu pluton in Tuquan, middle Da Hinggan Mountains
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摘要:
对突泉地区东福岩体二长岩进行了LA-ICP-MS锆石U-Pb年代学和地球化学研究，探讨其形成构造背景。结果显示，二长岩形成于161.8±1.1 Ma，时代为晚侏罗世早期；二长岩具有弱负Eu异常、富大离子亲石元素、贫高场强元素特征，原始岩浆应来自地壳物质的部分熔融；较高的Sr含量表明源区有少量斜长石残留，轻稀土元素富集、重稀土元素亏损暗示源区富集重稀土元素矿物（如石榴子石）的残留，二者共同揭示二长岩形成于中-高压环境，是加厚陆壳坍塌或拆沉到一定阶段部分熔融的产物。结合区域资料，认为该区晚侏罗世二长岩的形成与蒙古-鄂霍茨克缝合带演化至后碰撞阶段构造环境有关，蒙古-鄂霍茨克洋南西段在晚侏罗世早期已闭合。
Abstract:LA-ICP-MS zircon U-Pb geochronology and geochemistry of the monzonite in Dongfu pluton of Tuquan area was studied to explore the tectonic background of its formation.The results show that the monzonite was formed in Late Jurassic(161.8±1.1 Ma).The monzonite displays slightly negative Eu anomalies, enrichment of LILEs and depletion of HFSEs, suggesting that its primitive magma was derived from partial melting of the crust.High content of Sr shows the existence of a small amount of residual plagioclase in the source region.The enrichment of LREEs and depletion of HREEs suggest that the minerals such as pomegranate were enriched in HREEs in the source region.The residues of plagioclase and pomegranate reveal that the monzonites were formed in the environment with medium-high pressure, and were products of the partial melting of the thickened crust which delaminated or collapsed to a certain extent.Combined with regional geology, the authors hold that the formation of the monzonites was related to the post-collisional tectonic environment of the evolution in Mongolia-Okhotsk suture zone, and the southwestern part of the Mongolia-Okhotsk Ocean was closed in Late Jurassic.
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Key words:
- Tuquan area /
- geochemistry /
- Late Mesozoic /
- monzonites /
- tectonic environment /
- the Mongol-Okhotsk Ocean /
- post-collision
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表 1 突泉地区东福岩体二长岩锆石U-Th-Pb同位素分析结果
Table 1. Zircon U-Th-Pb isotopic analyses of the Dongfu monzonite in Tuquan area
样品点号 元素含量/10-6 同位素原子比值 年龄/Ma Pb U Th 232Th/238U 208Pb/206Pb 206Pb/238U 207Pb/235U 207Pb/206Pb 206Pb/238U 207Pb/235U 207Pb/206Pb G012-1-1 2 12 2 0.18 0.0441 0.0513<4> 0.378<43> 0.0522<60> 323±3 326±31 300±297 G012-1-2 6 73 21 0.29 0.0616 0.0251<2> 0.174<11> 0.0497<29> 160±1 163±9 189±142 G012-1-3 5 64 16 0.24 0.0564 0.0256<2> 0.175<9> 0.0502<26> 163±1 163±8 211±122 G012-1-4 7 89 45 0.51 0.0787 0.0256<4> 0.175<10> 0.0494<25> 163±3 164±9 165±119 G012-1-5 3 45 12 0.26 0.0564 0.0255<1> 0.177<10> 0.0501<29> 163±1 165±9 211±137 G012-1-6 3 38 7 0.18 0.0417 0.0252<2> 0.175<20> 0.0508<59> 160±1 164±17 232±248 G012-1-7 3 34 6 0.19 0.0407 0.0261<2> 0.178<14> 0.0490<38> 166±1 166±12 150±174 G012-1-8 6 74 21 0.29 0.0625 0.0255<3> 0.179<14> 0.0508<40> 162±2 167±12 232±183 G012-1-9 2 31 6 0.19 0.0336 0.0252<2> 0.174<19> 0.0492<54> 161±1 163±16 167±228 G012-1-10 3 40 4 0.09 0.0251 0.0258<2> 0.177<11> 0.0498<32> 164±1 166±10 183±148 G012-1-11 3 44 8 0.19 0.0336 0.0252<2> 0.172<17> 0.0492<48> 160±1 161±15 167±206 G012-1-12 3 42 8 0.19 0.0381 0.0251<1> 0.174<13> 0.0500<37> 159±1 163±11 195±175 G012-1-13 4 51 11 0.21 0.0427 0.0250<1> 0.172<11> 0.0498<31> 159±1 161±9 183±143 G012-1-14 4 46 12 0.26 0.0527 0.0259<2> 0.177<19> 0.0492<51> 165±1 165 ±16 167±217 G012-1-15 3 44 9 0.22 0.0426 0.0254<1> 0.176<11> 0.0498<31> 162±1 165±10 187±144 G012-1-16 11 147 21 0.14 0.0293 0.0262<5> 0.179<9> 0.0495<27> 167±3 167±8 172±128 G012-1-17 6 86 59 0.69 0.0522 0.0231<2> 0.161<11> 0.0500<33> 147±1 151±10 195±154 G012-1-18 3 36 7 0.20 0.0465 0.0290<2> 0.206<18> 0.0510<45> 184±1 190±15 239±199 G012-1-19 3 43 9 0.22 0.0362 0.0257<3> 0.177<22> 0.0499<61> 164±2 166±19 191±259 G012-1-20 3 17 3 0.18 0.0343 0.0498<5> 0.386<48> 0.0559<70> 313±3 331±35 450±281 G012-1-21 3 36 7 0.20 0.0332 0.0251<3> 0.171<23> 0.0504<67> 160±2 160±20 213±285 
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表 2 突泉地区东福岩体二长岩主量、微量和稀土元素分析结果
Table 2. Representative major, trace and rare earth element data of the Dongfu monzonite in Tuquan area
样品编号 G012-1 G012-2 G012-3 G012-4 G012-5 G012-6 SiO2 62.38 61.15 61.15 61.55 61.52 61.34 TiO2 0.79 0.8 0.81 0.77 0.78 0.79 Al2O3 15.8 16.29 16.53 16.38 16.26 16.25 Fe2O3 2.24 2.4 2.31 2.82 2.5 2.73 FeO 3.07 3.07 3 2.53 2.96 2.71 MnO 0.08 0.09 0.07 0.08 0.07 0.09 MgO 2.43 2.66 2.99 2.29 2.38 2.35 CaO 2.54 2.99 2.76 2.46 3.25 2.23 Na2O 7.04 6.77 5.86 7.96 6.26 8.34 K2O 1.53 1.67 1.99 1.04 1.83 1.28 P2O5 0.19 0.21 0.21 0.22 0.21 0.23 烧失量 1.38 1.39 1.8 1.43 1.46 1.17 总计 99.47 99.49 99.48 99.53 99.48 99.51 Na2O+K2O 8.57 8.44 7.85 9 8.09 9.62 K2O/Na2O 0.22 0.25 0.34 0.13 0.29 0.15 A/CNK 0.885 0.886 0.983 0.876 0.894 0.848 La 21 20.7 19.3 21 20.9 21.6 Ce 48.7 46.8 44.4 49.6 48.7 49.5 Pr 6.21 6.11 5.74 6.3 6.18 6.41 Nd 26.8 26.4 25.1 27.2 27.2 28.2 Sm 5.22 4.85 4.81 5.3 5.15 5.38 Eu 1.26 1.33 1.22 1.22 1.24 1.43 Gd 4.56 4.29 4.11 4.28 4.48 4.59 Tb 0.72 0.68 0.65 0.71 0.72 0.74 Dy 4.13 3.91 3.72 4.01 4.05 4.24 Ho 0.76 0.74 0.71 0.75 0.77 0.79 Er 2 1.92 1.88 1.97 2.04 2.08 Tm 0.35 0.35 0.32 0.32 0.37 0.36 Yb 2.54 2.51 2.37 2.39 2.63 2.6 Lu 0.37 0.38 0.35 0.37 0.39 0.39 (La/Yb)N 5.6 5.6 5.5 5.9 5.4 5.6 δEu 0.78 0.88 0.82 0.76 0.78 0.86 ΣREE 124.62 120.97 114.68 125.42 124.82 128.31 LREE/HREE 7.1 7.2 7.1 7.5 7.1 7.1 Ba 690 638 683 533 628 915 Rb 46.9 45.5 60.4 37.7 49.6 43.7 Sr 303 361 444 303 386 294 Y 21.5 20.9 20.3 20.8 22.1 22.1 Zr 299 244 254 255 279 239 Th 7.28 6.67 5.52 6.24 6.19 6.38 U 1.32 1.05 1.21 1.18 1.04 1.14 Nb 9 8.14 8.46 9.5 8.5 8.87 Ta 0.61 0.48 0.44 0.55 0.5 0.48 Hf 6.79 6.12 5.58 6.05 6.93 6.26 Ni 18.4 15.7 18.3 17.7 15.9 15.4 Cr 54.2 52.6 56.5 48.4 48.6 41.4 Zr/Y 13.91 11.67 12.51 12.26 12.62 10.81 Th/Yb 2.87 2.66 2.33 2.61 2.35 2.45 Ta/Yb 0.24 0.19 0.19 0.23 0.19 0.18 Sr/Y 14.09 17.27 21.87 14.57 17.47 13.3 Ti/Zr 15.82 19.66 19.03 18.18 16.84 19.71 Ce/Yb 19.17 18.65 18.73 20.75 18.52 19.04 注：主量元素含量单位为%，稀土和微量元素含量单位为10-6
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① 沈阳地质调查中心.1 5万突泉县幅地质图.2014.
② 吉林省地质局.1 20万突泉县幅区域地质调查报告.1977.
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