The discovery of Late Silurian quartz diorite in Langshan area of Inner Mongolia and its geological implications
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摘要:
内蒙古狼山山脉西侧分布零星的早古生代岩浆岩，晚志留世石英闪长岩主要出露于哈日音熬瑞一带。该岩体岩性为石英闪长岩，块状构造，LA-ICP-MS锆石U-Pb年龄显示，其206Pb/238U年龄加权平均值为419.0±4.0~413.3±1.8Ma。岩石暗色矿物为黑云母，富铁（4.27%~4.65%）、富钠（4.17%~4.45%），富集大离子亲石元素Sr、K、Pb，不同程度亏损高场强元素P、Ti、Nb，轻稀土元素富集，重稀土元素亏损，弱负Eu异常，这些特征与弧岩浆岩的地球化学特征相似；La/Ba-La/Nb图解显示俯冲交代地幔的源区特点；岩石负的εHf（t）值（-12.1~-8.8）及较大的TDM2值（1981~2362Ma）反映了古元古代古老地壳熔融的特点。花岗岩类构造判别图解及区域地质资料显示岩体形成于弧陆拼贴的构造背景。对比白乃庙地区新发现的晚志留世弧陆拼贴的石英闪长岩，两者的岩石地球化学特征及同位素特征基本一致，因此，华北地块北缘晚志留世弧陆拼贴作用向西延伸至狼山地区。
Abstract:The Early Paleozoic magmatites are sporadically distributed in the west of Langshan Mountain of Inner Mongolia, whereas the Late Silurian quartz diorite is mainly exposed in the zone of Hariyinaorui. LA-ICP-MS zircon U-Pb dating shows that the weighted average 206Pb/238U age of quartz diorite is 419.0±4.0~413.3±1.8Ma. The characteristics of quartz diorite mainly exhibit that the biotite is the main dark mineral, which is characterized by enrichment of TFeO (4.27%~4.65%) and Na2O (4.17%~4.45%), enrichment of LILE (Sr, K, Pb), depletion of P, Ti and Nb, enrichment of LREE, and depletion of HREE with weak negative Eu anomaly, similar to the characteristics of arc magmatite. La/Ba-La/Nb determinant diagram shows the characteristics of metasomatic mantle, and isotopic characteristics reflect the characteristics of melting of ancient continental crust which has an obvious negative εHf(t) value (-12.1~-8.8) and older TDM2 value (1981~2362Ma). Tectonic discrimination diagrams and regional geological data show the pluton probably formed the tectonic setting of arc-continent collision. A comparative study of recently published relevant data of Late Silurian quartz diorite in the Bainaimiao area shows that the geochemical characteristics are basically the same, and, therefore, arc-continent collision of Late Silurian extended westward to Langshan area on the northern margin of North China Craton.
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Keywords:
- Inner Mongolia /
- Langshan area /
- Late Silurian /
- quartz diorite /
- arc-continent collision
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致谢: 写作过程中，与中国地质调查局天津地质调查中心赵风清研究员、辛后田教授级高级工程师的讨论使笔者受益匪浅，审稿专家提出了宝贵意见及建议，在此一并致谢。
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图 1 研究区大地构造位置（a）和地质简图（b）（据参考文献[16]修改）
Figure 1. The tectonic location(a)and simplified geological map(b)of the study area
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图 3 石英闪长岩野外（a）和显微（b）照片
Bi—黑云母；Pl—斜长石；Kf—钾长石；Q—石英
Figure 3. Outcrop photo(a)and micrograph(b)of quartz diorite
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图 4 石英闪长岩锆石阴极发光（CL）图像（a）、锆石U-Pb谐和图及206Pb/238U年龄加权平均值图（b、c）
Figure 4. CL images (a), U-Pb concordia diagrams and average 206Pb/238U age (b, c) of zircons from quartz biorite
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图 6 微量元素蛛网图（a）和稀土元素配分曲线（b）[43]
Figure 6. Primitive mantle-normalized trace element spidergrams(a)and chondrite-normalized REE patterns(b)
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表 1 石英闪长岩主量、微量和稀土元素分析数据
Table 1 Whole-rock major, trace and rare earth elements of quartz diorite
样品号 P7-83-1 P10-142-1 P10-144-1 P10-146-1 SiO2 64.06 62.13 61.94 62.96 TiO2 0.45 0.47 0.49 0.46 Al2O3 16.26 16.56 16 16.24 Fe2O3 0.07 2.16 2.46 0.28 FeO 4.49 2.71 2.38 4.02 MnO 0.13 0.09 0.11 0.078 MgO 2.21 2 3.32 2.46 CaO 4.38 4.05 3.24 2.91 Na2O 4.17 4.23 4.33 4.45 K2O 1.13 1.47 1.06 1.17 P2O5 0.16 0.16 0.17 0.15 H2O+ 1.98 3.67 4.23 4.39 CO2 2.19 1.88 1.61 2.37 烧失量 0.66 17.17 23.77 19.48 总和 99.49 99.70 99.73 99.57 TFeO 4.55 4.65 4.59 4.27 TFe2O3 4.11 4.60 4.60 3.90 Cs 4.5 0.96 0.87 0.58 Rb 104 28.3 39.3 26.8 Sr 336 461 354 284 Ba 471 462 800 398 Ga 19.6 14.7 15.3 14.4 Nb 11.6 6.5 5.92 5.92 Ta 1.03 0.55 0.45 0.48 Zr 161 95.6 91.3 89.3 Hf 5.03 2.89 2.77 2.81 Th 13.4 7.05 6.13 6.57 V 88.7 98.3 106 123 Cr 16.6 8.6 9.69 9.12 Co 10.1 10.1 9.47 10.3 N1 5.23 4.31 4.73 4.64 Li 18.4 6.25 7.27 7.72 Sc 14.6 12.4 12.9 13.8 U 1.6 1.61 0.9 0.94 Pb 17.1 7.24 8.03 4.81 Zn 88.6 68.7 54.4 57.6 Cu 6.12 16.80 5.06 13.60 La 28.8 24.8 21.3 19.6 Ce 45.5 34.5 31.8 28.6 Pr 6.74 5.17 4.72 4.53 Nd 24.8 18.9 17.6 17.3 Sm 4.6 3.3 3.12 3.06 Eu 1.19 0.98 1 0.94 Gd 4 2.8 2.61 2.52 Tb 0.66 0.46 0.41 0.4 Dy 3.64 2.54 2.35 2.29 Ho 0.67 0.51 0.46 0.46 Er 1.94 1.54 1.42 1.37 Tm 0.28 0.25 0.22 0.22 Yb 1.84 1.67 1.56 1.54 Lu 0.27 0.28 0.26 0.25 Y 17.8 13.6 12.1 12.1 ΣREE 142.73 111.30 100.93 95.18 LREE 111.63 87.65 79.54 74.03 HREE 31.10 23.65 21.39 21.15 LREE/HREE 3.59 3.71 3.72 3.50 注: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 2 石英闪长岩LA-ICP-MS锆石U-Th-Pb定年数据
Table 2 LA-ICP-MS zircon U-Th-Pb data for quartz diorites
样品号 含量/10-6 232Th/238U 同位素比值 年龄/Ma Pb U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/235U 1σ TW5025-1 1 89 1201 0.277 0.001 0.0730 0.0008 0.844 0.0121 454 5 621 9 2 65 919 0.141 0.001 0.0729 0.0008 0.680 0.0095 454 5 527 7 3 145 1955 0.217 0.003 0.0734 0.0008 0.772 0.0111 457 5 581 8 4 92 1112 0.305 0.002 0.0742 0.0008 1.23 0.0283 461 5 815 19 5 100 1293 0.474 0.005 0.0727 0.0008 0.689 0.0102 453 5 532 8 6 73 867 0.408 0.006 0.0732 0.0007 1.065 0.0232 456 5 736 16 7 66 933 0.192 0.001 0.0732 0.0008 0.569 0.0083 456 5 458 7 8 40 536 0.343 0.006 0.0728 0.0008 0.597 0.0088 453 5 476 7 9 44 538 0.307 0.001 0.0730 0.0009 0.926 0.0199 454 6 666 14 10 24 306 0.490 0.002 0.0728 0.0008 0.587 0.0125 453 5 469 10 11 45 440 0.244 0.003 0.0870 0.0012 1.47 0.0368 538 7 920 23 12 57 847 0.063 0.001 0.0723 0.0007 0.560 0.0082 450 5 451 7 13 129 1271 0.338 0.001 0.0737 0.0009 1.97 0.0284 459 5 1106 16 14 198 1976 0.392 0.004 0.0747 0.0008 1.89 0.0259 464 5 1078 15 15 198 1965 0.331 0.002 0.0744 0.0008 1.90 0.0278 462 5 1080 16 16 28 371 0.384 0.001 0.0728 0.0007 0.615 0.0104 453 5 486 8 17 43 533 0.561 0.002 0.0637 0.0007 1.33 0.0248 398 5 860 16 18 37 528 0.378 0.007 0.0684 0.0007 0.556 0.0085 427 4 449 7 19 221 3211 0.085 0.000 0.0727 0.0007 0.586 0.0079 453 5 468 6 20 101 1433 0.116 0.002 0.0734 0.0008 0.618 0.0086 457 5 488 7 21 42 576 0.357 0.003 0.0723 0.0007 0.562 0.0085 450 4 453 7 22 19 275 0.448 0.002 0.0680 0.0007 0.544 0.0109 424 5 441 9 23 16 233 0.298 0.004 0.0667 0.0007 0.518 0.0124 416 4 424 10 24 16 237 0.402 0.001 0.0659 0.0007 0.514 0.0112 411 4 421 9 25 71 1046 0.259 0.001 0.0675 0.0007 0.616 0.0088 421 4 487 7 26 140 1393 0.328 0.005 0.0750 0.0009 2.16 0.0563 466 6 1167 30 27 18 255 0.489 0.015 0.0668 0.0007 0.544 0.0111 417 4 441 9 28 127 1688 0.218 0.001 0.0666 0.0007 1.05 0.0171 416 4 729 12 29 21 272 0.664 0.009 0.0639 0.0007 0.994 0.0171 399 4 701 12 30 38 443 0.511 0.004 0.0732 0.0007 1.13 0.0186 456 5 766 13 31 15 228 0.383 0.000 0.0667 0.0007 0.523 0.0115 416 4 427 9 32 16 218 0.593 0.001 0.0682 0.0007 0.541 0.0130 425 4 439 11 TWP7—83—1 1 22 295 0.2304 0.0009 0.0728 0.0008 0.701 0.0115 453 5 539 9 2 22 330 0.3291 0.0021 0.0661 0.0007 0.508 0.0081 412 4 417 7 3 27 407 0.3479 0.0029 0.0663 0.0008 0.500 0.0067 414 5 412 6 4 60 1105 0.2189 0.0004 0.0522 0.0006 0.560 0.0085 328 3 452 7 5 31 457 0.3598 0.0027 0.0664 0.0007 0.508 0.0089 415 4 417 7 6 23 317 0.4917 0.0007 0.0672 0.0007 0.622 0.0103 419 4 491 8 7 22 332 0.2979 0.0036 0.0661 0.0007 0.502 0.0093 412 4 413 8 8 21 322 0.3762 0.0018 0.0660 0.0007 0.504 0.0072 412 4 414 6 9 27 405 0.2973 0.0010 0.0662 0.0007 0.514 0.0080 413 4 421 7 10 22 330 0.4002 0.0043 0.0663 0.0007 0.508 0.0073 414 4 417 6 11 29 430 0.3305 0.0008 0.0665 0.0007 0.507 0.0079 415 4 416 6 12 26 387 0.2942 0.0016 0.0667 0.0007 0.501 0.0072 416 4 412 6 13 26 375 0.3984 0.0044 0.0660 0.0007 0.503 0.0081 412 4 414 7 14 26 390 0.3682 0.0030 0.0661 0.0007 0.510 0.0073 412 4 418 6 15 29 440 0.3739 0.0015 0.0661 0.0007 0.505 0.0073 413 4 415 6 16 28 413 0.4278 0.0036 0.0664 0.0007 0.503 0.0070 414 4 414 6 17 17 242 0.5087 0.0016 0.0662 0.0007 0.501 0.0086 413 4 412 7 18 18 258 0.4637 0.0020 0.0663 0.0007 0.504 0.0073 414 4 414 6 19 28 450 0.0628 0.0002 0.0661 0.0006 0.501 0.0079 412 4 412 6 20 23 346 0.4553 0.0022 0.0661 0.0007 0.501 0.0083 413 4 412 7 21 21 311 0.4855 0.0048 0.0660 0.0007 0.507 0.0179 412 4 416 15 22 16 220 0.6473 0.0014 0.0660 0.0007 0.505 0.0065 412 4 415 5 23 164 3480 0.4333 0.0010 0.0371 0.0004 0.803 0.0141 235 2 598 11 24 28 404 0.5038 0.0013 0.0666 0.0007 0.506 0.0072 415 4 416 6
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表 3 石英闪长岩锆石Hf同位素数据
Table 3 Zircon Hf isotopic composition of U-Pb data for quartz diorite of Late Silurian
样品号 年龄/Ma 176Lu/177Hf(corr) 2σ l76Hf/l77Hf(corr) 2σ εHf(0) εHf(t) 2σ TDM1/Ma 2σ fLu/Hf TDM2/Ma 1 413 0.0006 0.000003 0.3 0.00001 19.5 - 10.5 0.5 1438 36 -0.98 2063 2 413 0.0006 0.000005 0.3 0.00001 20.0 - 11.1 0.4 1460 34 -0.98 2098 3 413 0.0006 0.000002 0.3 0.00001 19.5 - 10.6 0.5 1442 35 -0.98 2068 4 413 0.0006 0.000006 0.3 0.00001 20.5 - 11.6 0.5 1482 37 -0.98 2131 5 413 0.0006 0.000004 0.3 0.00001 21.0 - 12.1 0.5 1498 41 -0.98 2158 6 413 0.0006 0.000006 0.3 0.00001 18.2 -9.2 0.4 1389 34 -0.98 1982 7 413 0.0006 0.000006 0.3 0.00001 19.6 - 10.7 0.5 1443 39 -0.98 2072 8 413 0.0006 0.000011 0.3 0.00001 20.2 - 11.3 0.5 1469 38 -0.98 2111 9 413 0.0008 0.000005 0.3 0.00001 19.8 - 11.0 0.5 1462 40 -0.98 2091 10 413 0.0006 0.000006 0.3 0.00001 20.4 - 11.5 0.5 1478 38 -0.98 2125 11 413 0.0006 0.000004 0.3 0.00002 22.8 - 13.9 0.5 1569 42 -0.98 2273 12 413 0.0005 0.000004 0.3 0.00002 20.1 - 11.2 0.6 1462 43 -0.98 2103 13 413 0.0004 0.000005 0.3 0.00002 24.3 - 15.3 0.6 1619 43 -0.99 2363 14 413 0.0008 0.000002 0.3 0.00002 18.5 -9.6 0.6 1407 44 -0.98 2004
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