Evidence of zircon U-Pb dating and rock geochemical characteristics of Badangshan volcanic rocks and metamorphic quartz diorite on the northern margin of North China craton
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摘要:
赤峰东部郎郡哈拉地区变质石英闪长岩侵入到八当山火山岩中。用LA-ICP-MS技术，测得赤峰郎郡哈拉地区片理化流纹岩和变质石英闪长岩锆石206Pb/238U年龄分别为387.6±2.8Ma（MSWD=0.27，n=26）和387.1±2.3Ma（MSWD=0.34，n=28），可分别代表片理化流纹岩和变质石英闪长岩的形成年龄，属于中泥盆世岩浆活动的产物。根据地球化学特征，片理化流纹岩具有高硅、碱、铝，贫铁、镁、钙及过铝质的特征，属于钙碱性系列岩浆。轻、重稀土元素分馏较弱，具有弱负Eu异常。该片理化流纹岩具富集大离子亲石元素，亏损高场强元素，有明显的Ti、Nb和Ta负异常，Ti/Y和Zr/Y值较低，显示壳源特征。变质石英闪长岩具有高铝、铁、镁、钙及过铝质的特征，属于钙碱性系列岩浆。轻、重稀土元素分馏较弱，具有弱负Eu异常。该变质石英闪长岩富集大离子亲石元素，亏损高场强元素，有明显的Ta、Nb、Y负异常，显示出壳幔混源特征。构造环境判别显示，二者形成于活动大陆边缘，是大洋板块俯冲后的产物，可能与白乃庙岛弧和华北克拉通北缘碰撞后的伸展环境有关。
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关键词:
- 八当山火山岩 /
- 变质石英闪长岩 /
- LA-ICP-MS锆石U-Pb定年 /
- 片理化流纹岩 /
- 华北克拉通北缘
Abstract:Metamorphic quartz diorite intruded into the the Badangshan volcanic rocks in Langjunhala area, eastern Chifeng City. LAICP-MS zircon U-Pb dating technique constrained the age of schistosity rhyolite and quartz diorite. The results show that the ages of schistosity rhyolite and quartz diorite are 387.6±2.8Ma and 387.1±2.3Ma, aindicating the Middle Devonian magmatic activity. According to the geochemical characteristics of foliated rhyolite with high silicon, alkali, aluminum, iron, magnesium, calcium and poor peraluminous characteristics, the rocks belong to the calc alkaline series. The light and heavy REE fractionation is weak and the Eu has weak negative anomaly. The foliated rhyolite has lower Ti/Y and Zr/Y ratios, implying the source of lithospheric mantle. Metamorphic quartz diorite is characterized by high aluminium, iron, magnesium, calcium and peraluminous, belonging to calcalkaline series magma. The fractionation of light and heavy rare earth elements is weak, with weak negative Eu anomaly. The metamorphic quartz diorite is enriched in large ion lithophile elements and depleted in high field strength elements. It has obvious negative anomalies of Ta, Nb and Y, implying mixed source characteristics of crust and mantle. Tectonic environment discriminations show that it formed on the active continental margin and was the product of subduction of the oceanic plate, probably related to the extensional environment after the collision between the Bainaimiao island arc and the northern margin of the North China craton.
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致谢: 中国地质科学院矿产资源研究所王倩和侯可军博士在锆石U-Pb测年过程中给予支持和帮助，长春工程学院杨扬博士和中国地质调查局发展研究中心申亮博士对本文提出了宝贵的建议，在此一并表示感谢。
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图版Ⅰ
a. 片理化流纹岩野外露头； b. 变质石英闪长岩野外露头； c. 变质石英闪长岩中可见片理化流纹岩捕虏体； d、 e. 片理化流纹岩镜下特征； f. 变质石英闪长岩镜下特征。Pl—斜长石； Q—石英； Bi—黑云母； Pth—条纹长石； Ms—白云母
图版Ⅰ.
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图 2 八当山火山岩片理化流纹岩锆石阴极发光（CL）图像及测点206Pb/238U年龄值
Figure 2. CL images and 206Pb/238U age of single analyzed points of some analyzed zircons from foliated rhyolite of Badangshan volcanic rock
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图 3 八当山火山岩片理化流纹岩（541TW1）锆石U-Pb谐和图和206Pb/238U年龄图
Figure 3. Concordia U-Pb and 206Pb/238U ages diagrams of zircons from foliated rhyolite (541TW1) of Badangshan volcanic rock
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图 4 变质石英闪长岩锆石阴极发光（CL）图像及测点206Pb/238U年龄值
Figure 4. CL images and 206Pb/238U age of single analyzed points of some analyzed zircons from metamorphic quartz diorite
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图 5 变质石英闪长岩（HP10TW1）U-Pb谐和图和206Pb/238U年龄图
Figure 5. Concordia U-Pb and 206Pb/238U ages diagrams of zircons from metamorphic quartz diorite (HP10TW1)
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图 6 八当山火山岩SiO2-K2O(a)和A/CNK-A/NK(b)图解
Figure 6. SiO2-K2O (a) and A/CNK-A/NK(b) diagrams of Badangshan volcano rock
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图 7 片理化流纹岩和变质石英闪长岩稀土元素配分图(a)和微量元素蛛网图(b)(原始地幔、球粒陨石标准化值据参考文献[12])
Figure 7. Chondire-normalized REE patterns (a) and trace elements spider diagrams (b) of foliated rhyolite and metamorphic quartz diorite
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图 8 片理化流纹岩构造环境判别图解
MORB—大洋中脊玄武岩；OIB—洋岛玄武岩；CCA—大陆地壳平均值；DOIB—Dupal型洋岛玄武岩；WPB—板内玄武岩；CA—大陆弧
Figure 8. Tectonic environment discrimination diagrams of foliated rhyolite
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图 9 变质石英闪长岩构造环境判别图解[21]
MORB—大洋中脊玄武岩；VAG—火山弧花岗岩；syn-COLG—同碰撞花岗岩；WPG—板内花岗岩；ORG—洋中脊花岗岩
Figure 9. Tectonic environment discrimination diagrams of metamorphic quartz diorite
表 1 八当山片理化流纹岩和变质石英闪长岩LA-ICP-MS锆石U-Th-Pb同位素测试结果
Table 1 LA-ICP-MS zircon U-Th-Pb analytical data of Badangshan foliated rhyolite and metamorphic quartz diorite
测试点 Pb Th U Th/U 同位素比值 年龄/Ma 10-6 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/235U 误差 206Pb/238U 误差 541TW1-片理化流纹岩 01 18.53 198 252 0.79 0.491 0.027 0.0619 0.0009 405 18 387 6 02 14.75 187 189 0.99 0.473 0.023 0.0622 0.0010 393 16 389 6 03 17.09 178 230 0.78 0.475 0.023 0.0617 0.0008 395 16 386 5 04 11.25 110 151 0.73 0.481 0.038 0.0625 0.0017 398 26 391 10 05 26.10 381 331 1.15 0.470 0.017 0.0614 0.0008 391 11 384 5 06 18.28 166 252 0.66 0.476 0.020 0.0614 0.0009 396 14 384 6 07 11.00 111 148 0.75 0.467 0.030 0.0611 0.0014 389 21 382 9 09 52.84 879 601 1.46 0.477 0.016 0.0616 0.0009 396 11 386 5 10 16.58 141 220 0.64 0.469 0.025 0.0626 0.0015 391 17 391 9 12 11.50 134 144 0.93 0.474 0.029 0.0612 0.0012 394 20 383 7 14 17.25 262 200 1.31 0.645 0.059 0.0605 0.0010 505 36 379 6 15 20.91 326 249 1.31 0.483 0.024 0.0620 0.0010 400 16 388 6 16 16.68 164 222 0.74 0.486 0.024 0.0623 0.0010 402 17 389 6 17 21.49 190 286 0.66 0.495 0.024 0.0631 0.0009 408 16 394 6 18 15.95 151 212 0.71 0.506 0.043 0.0623 0.0015 416 29 389 9 19 18.06 191 239 0.80 0.473 0.025 0.0622 0.0010 393 18 389 6 20 8.52 94 112 0.84 0.464 0.044 0.0619 0.0017 387 31 387 10 21 14.02 124 192 0.65 0.478 0.030 0.0623 0.0009 397 21 390 6 22 49.08 683 589 1.16 0.567 0.025 0.0619 0.0013 456 16 387 8 23 22.86 178 320 0.55 0.479 0.021 0.0621 0.0009 397 15 388 5 24 8.44 78 116 0.67 0.472 0.031 0.0614 0.0012 392 21 384 7 25 13.39 116 145 0.81 0.977 0.050 0.0675 0.0011 692 25 421 6 26 13.62 206 174 1.18 0.663 0.092 0.0613 0.0023 516 56 384 14 28 11.41 118 144 0.82 0.482 0.036 0.0635 0.0014 399 25 397 9 29 12.33 137 158 0.87 0.488 0.053 0.0618 0.0020 404 36 386 12 30 30.51 259 397 0.65 0.559 0.039 0.0629 0.0012 451 25 393 7 HP10TW1-变质石英闪长岩 01 11.14 180 136 1.32 0.485 0.030 0.0613 0.0012 401 20 383 7 02 16.45 309 186 1.67 0.468 0.028 0.0618 0.0012 390 19 387 7 03 16.93 294 191 1.54 0.486 0.024 0.0628 0.0011 402 16 393 7 04 14.81 252 171 1.48 0.480 0.027 0.0629 0.0012 398 19 393 7 05 21.56 459 230 2.00 0.497 0.021 0.0619 0.0010 409 14 387 6 06 17.44 368 190 1.93 0.459 0.022 0.0614 0.0009 384 15 384 6 07 27.59 631 289 2.18 0.487 0.020 0.0614 0.0008 403 14 384 5 08 13.65 269 156 1.73 0.483 0.024 0.0606 0.0011 400 17 379 7 09 10.52 172 130 1.32 0.480 0.028 0.0619 0.0011 398 19 387 7 10 25.19 513 272 1.89 0.463 0.020 0.0618 0.0010 386 14 387 6 11 18.91 359 209 1.71 0.478 0.029 0.0622 0.0011 397 20 389 7 12 15.92 320 172 1.86 0.483 0.034 0.0614 0.0010 400 23 384 6 13 17.97 331 201 1.65 0.471 0.024 0.0628 0.0011 392 17 393 7 14 19.60 387 220 1.76 0.472 0.022 0.0628 0.0010 393 15 393 6 15 23.11 467 260 1.80 0.491 0.019 0.0622 0.0010 406 13 389 6 16 16.05 316 184 1.72 0.490 0.027 0.0614 0.0010 405 18 384 6 17 15.78 329 173 1.91 0.484 0.030 0.0624 0.0011 401 20 390 7 18 17.02 323 198 1.63 0.480 0.026 0.0620 0.0009 398 18 388 5 19 20.84 454 225 2.02 0.478 0.019 0.0621 0.0009 397 13 389 5 20 16.32 356 180 1.98 0.484 0.023 0.0619 0.0010 400 16 387 6 21 27.33 589 306 1.92 0.457 0.018 0.0609 0.0009 382 13 381 5 22 14.52 292 154 1.89 0.477 0.046 0.0623 0.0019 396 31 390 12 23 6.97 92 95 0.97 0.385 0.032 0.0571 0.0017 330 23 358 11 24 26.13 558 269 2.08 0.458 0.018 0.0621 0.0008 383 13 388 5 25 13.26 228 152 1.50 0.495 0.024 0.0619 0.0010 408 16 387 6 26 25.06 539 262 2.06 0.496 0.029 0.0621 0.0011 409 20 388 7 27 21.43 425 233 1.83 0.481 0.021 0.0619 0.0009 398 14 387 6 28 14.95 251 154 1.64 0.958 0.051 0.0644 0.0013 682 27 402 8 29 19.94 335 223 1.50 0.469 0.025 0.0628 0.0009 390 18 393 6 30 28.52 516 318 1.62 0.471 0.020 0.0613 0.0009 392 14 383 5 
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表 2 片理化流纹岩和变质石英闪长岩主量、微量和稀土元素分析结果
Table 2 Analytical results of major, trace and rare earth elements of foliated rhyolite and metamorphic quartz diorite
岩性 片理化流纹岩 变质石英闪长岩 样品号 S30 S31 S32 S33 GP10 GP11 GP12 SiO2 71.96 76.4 76.1 74.2 56.94 55.44 66.82 TiO2 0.23 0.07 0.21 0.22 1.08 1.11 0.92 Al2O3 14.69 13.4 13.4 13.4 16.07 16.88 12.72 Fe2O3 2.22 0.97 1.48 1.82 4.65 2.59 3.27 FeO 0.68 0.39 0.23 0.74 3.09 5.5 2.38 MnO 0.034 0.02 0.03 0.03 0.19 0.21 0.13 MgO 0.54 0.28 0.23 0.32 3.37 3.69 1.77 CaO 0.45 0.38 0.37 0.4 4.74 4.97 2.43 Na2O 4.69 5.78 4.95 4.46 3.95 3.55 4.5 K2O 2.49 1.32 1.71 3.44 1.95 1.24 1.5 P2O5 0.036 0.03 0.03 0.02 0.26 0.26 0.3 烧失量 0.5 0.29 0.32 0.36 2.83 3.75 2.37 总量 99.57 99.746 100.012 99.731 99.12 99.19 99.11 Ba 775 436 394 939 866 446 617 Co 3.52 1.4 0.7 0.73 0.78 21.6 15.1 Cr 11.3 8.38 8.42 7.75 11.6 21.6 8.29 Nb 17.7 7.6 12.9 17.5 17.3 5.09 8.04 Ni 2.72 1.88 2.14 0.9 1.29 14.1 8.6 Rb 57.2 29 41.8 64.8 101 22.9 31.7 Sr 88.3 95.8 101 95.6 45.3 452 205 V 26.3 3.18 15 10.6 5.66 163 92.7 Zr 333 94 355 347 341 143 200 Hf 9.23 3.43 9.07 8.39 11.4 4.63 6.12 Ta 1.04 0.38 0.79 1.01 1.26 0.21 0.42 Li 8.86 6.77 7.75 5.62 8.66 14.8 12.1 Be 2.61 1.1 1.52 2.1 2.29 1.12 0.97 Th 11 3.77 12.1 8.98 13.4 1.95 5.14 U 2.29 0.76 2.33 2.08 2.7 0.67 1.44 La 31 14.8 46.4 30.3 20.7 18.3 14.1 Ce 89.1 30.8 104 69.9 47 43.1 31.1 Pr 6.84 3.44 10.9 7.78 6.53 5.74 4.49 Nd 24.8 12.8 39.9 30.2 30.1 25.4 20 Sm 4.54 2.91 7.03 5.71 6.37 5.78 4.41 Eu 0.75 0.57 1.3 1.01 1.98 1.58 1.13 Gd 4.8 2.6 6.69 5.91 6.27 5.65 4.62 Tb 0.71 0.48 1.05 1.07 1.18 0.94 0.76 Dy 5.11 3.06 6.64 6.7 6.5 5.72 4.73 Ho 1.16 0.78 1.39 1.53 1.39 1.13 1.23 Er 3.42 2.31 4.67 4.83 3.99 3.48 3.15 Tm 0.69 0.36 0.73 0.63 0.54 0.49 0.48 Yb 4.62 2.89 5.14 4.5 3.69 3.51 3.13 Lu 0.69 0.45 0.82 0.64 0.5 0.53 0.45 Y 32.2 19 39.4 39.7 36.3 30.8 29.5 ΣREE 178.23 78.25 236.66 170.71 136.74 121.35 93.78 LREE 157.03 65.32 209.53 144.9 112.68 99.9 75.23 HREE 21.2 12.93 27.13 25.81 24.06 21.45 18.55 LREE/HREE 7.41 5.05 7.72 5.61 4.68 4.66 4.06 (La/Yb)N 4.81 3.67 6.48 4.83 4.02 3.74 3.23 δEu 0.49 0.62 0.57 0.53 0.95 0.83 0.76 δCe 1.44 1.02 1.09 1.09 0.98 1.02 0.95 La/Nb 1.75 1.95 3.6 1.73 Ba/Nb 43.79 57.37 30.54 53.66 Ta/Yb 0.23 0.13 0.15 0.22 Th/Yb 2.38 1.3 2.35 2 注： 主量元素含量单位为%，微量和稀土元素含量为 10-6
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