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北祁连造山带东端早古生代岩浆作用过程——来自甘肃天水长沟河闪长质片麻岩锆石年龄、微量元素及Hf同位素的证据

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张佳瑶, 何艳红, 陈亮, 徐可心. 北祁连造山带东端早古生代岩浆作用过程——来自甘肃天水长沟河闪长质片麻岩锆石年龄、微量元素及Hf同位素的证据[J]. 地质通报, 2019, 38(10): 1626-1636.
引用本文: 张佳瑶, 何艳红, 陈亮, 徐可心. 北祁连造山带东端早古生代岩浆作用过程——来自甘肃天水长沟河闪长质片麻岩锆石年龄、微量元素及Hf同位素的证据[J]. 地质通报, 2019, 38(10): 1626-1636.
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ZHANG Jiayao, HE Yanhong, CHEN Liang, XU Kexin. Paleozoic magma evolution at the eastern end of Northern Qilian orogenic belt: Evidence from the zircon U-Pb ages, trace elements and Hf isotopic composition of Changgouhe dioritic gneiss[J]. Geological Bulletin of China, 2019, 38(10): 1626-1636.
Citation: ZHANG Jiayao, HE Yanhong, CHEN Liang, XU Kexin. Paleozoic magma evolution at the eastern end of Northern Qilian orogenic belt: Evidence from the zircon U-Pb ages, trace elements and Hf isotopic composition of Changgouhe dioritic gneiss[J]. Geological Bulletin of China, 2019, 38(10): 1626-1636.
shu

北祁连造山带东端早古生代岩浆作用过程——来自甘肃天水长沟河闪长质片麻岩锆石年龄、微量元素及Hf同位素的证据

  • 西北大学大陆动力学国家重点实验室/西北大学地质学系, 陕西 西安 710069

  • 基金项目:
    国家自然科学基金项目《早古生代胶-辽-吉带岩浆作用：地球化学和年代学研究》（批准号：41421002）和国家自然科学创新群体项目《大陆构造与动力学》（批准号：41102121）
详细信息
    作者简介: 张佳瑶(1994-), 女, 在读硕士生, 矿物学、岩石学、矿床学专业。E-mail:zhangjiayaoxian@163.com
    通讯作者: 何艳红(1979-), 女, 副教授, 硕士生导师, 从事前寒武纪地质研究。E-mail:he-hk@163.com

  • 中图分类号: P597+.3;P534.4

Paleozoic magma evolution at the eastern end of Northern Qilian orogenic belt: Evidence from the zircon U-Pb ages, trace elements and Hf isotopic composition of Changgouhe dioritic gneiss

  • State Key Laboratory of Continental Dynamics, Northwest University/Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China

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    摘要

  • 甘肃天水地区长沟河闪长岩位于北祁连造山带东端，发育片麻状构造面理，长期以来被认为是形成于前寒武纪的侵入岩体。用LA-ICP-MS技术测得2组岩浆锆石的206Pb/238U年龄为463.3±2.3Ma（MSWD=0.52，n=11）和443.8±2.6Ma（MSWD=0.44，n=9）。锆石微量元素分析表明，2组年龄具有一致的微量元素组成，说明二者晶出于同源封闭的岩浆体系。t-Eu/Eu*投图显示，约460Ma的岩浆锆石无Eu异常，与幔源岩浆锆石稀土元素特征一致。而约440Ma的岩浆锆石具有负Eu异常，指示母岩开始发生斜长石的结晶分离，与深熔作用过程一致。因此，约460Ma为长沟河闪长质片麻岩原岩的形成年龄，约440Ma为长沟河闪长质片麻岩深熔岩浆的结晶年龄。Hf同位素分析测试结果显示，约460Ma和约440Ma两组锆石的εHf（t）值分别为8.23~11.57和6.36~8.03，指示460Ma发育幔源新生地壳岩浆作用，而440Ma壳源再造活动增强。

    Outcropped at the eastern end of the Northern Qilian orogenic belt in Tianshui area of Gansu Province, Changgouhe dioritic intrusion has traditionally been considered as Precambrian intrusive rocks due to their gneiss structure. The results of LAICP-MS zircon U-Pb dating in this study show two groups of magmatic zircon crystallization ages at 463.3±2.3Ma (MSWD=0.52, n=11) and 443.8 ±2.6Ma (MSWD=0.44, n=9). Zircon trace element analyses show that these two groups share the similar trace element compositions, indicating that they crystallized in a closed magmatic system. t-Eu/Eu* diagram shows that the magmatic zircons of about 460Ma have no Eu anomalies, similar to the REE patterns of mantle-derived zircons. The negative Eu anomaly of about 440Ma magmatic zircons indicates that the parent magma began to crystallize plagioclase, consistent with the process of the anatexis. Therefore, about 460Ma is the formation age of Changgouhe dioritic gneiss, and about 440Ma is the crystallization age of anatexis magma of Changgouhe dioritic gneiss. Hf isotope analysis shows that εHf(t) values of about 460Ma and about 440Ma zircons are 8.23~11.57 and 6.36~8.03 respectively, indicating that mantle-derived juvenile crustal magma was developed at about 460Ma and that more involvement of crustal remelting took place at about 440Ma.

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  • 图 1  秦岭-祁连造山带(a)和北祁连造山带东端地质简图(b)[26]

    Figure 1. 

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    图 2  长沟河闪长质片麻岩野外(a)及镜下照片(b、c，单偏光和正交偏光)

    Figure 2. 

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    图 3  长沟河闪长质片麻岩（16LS09-2）锆石阴极发光（CL）图像

    Figure 3. 

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    图 4  长沟河闪长质片麻岩LA-ICP-MS锆石U-Pb谐和图

    Figure 4. 

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    图 5  长沟河闪长质片麻岩锆石稀土元素配分图解

    Figure 5. 

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    图 6  长沟河闪长质片麻岩年龄t-εHf(t)图解

    Figure 6. 

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    图 7  长沟河闪长质片麻岩锆石微量元素相关图解

    Figure 7. 

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    图 8  长沟河闪长质片麻岩锆石t-Eu/Eu*图解

    Figure 8. 

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    表 1  长沟河闪长质片麻岩LA-ICP-MS锆石U-Th-Pb同位素分析结果

    Table 1.  LA-ICP-MS zircon U- Th-Pb isotope analyses of the Changgouhe dioritic gneiss

    点号 含量/10-6 Th/U 同位素比值 同位素年龄/Ma 谐和度/%
    Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ
    1 253 269 0.94 0.055 0.002 0.537 0.017 0.071 0.001 408 71 436 11 441.4 4.0 99
    2 557 481 1.16 0.058 0.002 0.591 0.014 0.074 0.001 529 54 472 9 459.6 3.5 103
    4 663 453 1.46 0.056 0.002 0.548 0.014 0.071 0.001 440 60 444 9 444.1 3.6 100
    5 636 396 1.61 0.057 0.001 0.581 0.012 0.074 0.001 478 51 465 8 462.4 3.3 101
    6 244 238 1.03 0.057 0.002 0.588 0.023 0.075 0.001 476 87 470 14 467.8 5.0 100
    7 214 204 1.05 0.056 0.002 0.573 0.017 0.075 0.001 442 70 460 11 463.3 4.1 99
    9 605 440 1.38 0.058 0.002 0.579 0.014 0.072 0.001 540 58 464 9 448.1 3.6 103
    10 927 560 1.66 0.056 0.001 0.580 0.014 0.075 0.001 465 56 464 9 464.0 3.5 100
    12 421 373 1.13 0.055 0.002 0.559 0.016 0.074 0.001 403 66 451 10 460.3 3.9 98
    13 560 403 1.39 0.058 0.002 0.598 0.016 0.076 0.001 508 61 476 10 469.0 3.8 101
    14 491 374 1.31 0.056 0.002 0.552 0.015 0.072 0.001 443 62 446 10 446.7 3.7 100
    15 363 343 1.06 0.056 0.002 0.578 0.014 0.075 0.001 457 56 463 9 464.2 3.6 100
    16 259 250 1.04 0.056 0.002 0.549 0.016 0.071 0.001 444 69 444 11 444.1 3.9 100
    18 126 141 0.89 0.060 0.003 0.584 0.023 0.071 0.001 598 87 467 15 440.7 4.8 106
    20 488 356 1.37 0.056 0.002 0.549 0.017 0.071 0.001 456 71 444 11 442.0 4.0 101
    21 109 110 0.99 0.056 0.002 0.545 0.021 0.071 0.001 441 88 442 14 441.9 4.7 100
    23 160 188 0.85 0.057 0.002 0.615 0.025 0.078 0.001 488 90 487 15 486.1 5.4 100
    24 504 376 1.34 0.056 0.001 0.574 0.014 0.074 0.001 454 56 461 9 461.6 3.6 100
    26 414 300 1.38 0.060 0.002 0.618 0.018 0.075 0.001 608 65 489 11 463.2 4.1 105
    28 168 182 0.92 0.056 0.002 0.544 0.022 0.071 0.001 440 90 441 14 441.3 4.8 100
    29 251 258 0.97 0.057 0.002 0.582 0.022 0.075 0.001 473 84 466 14 464.3 4.8 100
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    表 2  长沟河闪长质片麻岩锆石微量元素数据分析结果

    Table 2.  Analytical results of trace element data of zircons from Changgouhe dioritic gneiss

    点号 1 2 4 5 6 7 9 10 12 13 14 15 16 18 20 21 23 24 26 28 29
    Pb 26 51 49 46 26 23 45 66 39 45 40 36 24 12 37 11 20 41 33 17 25
    La — 0.207 0.222 0.129 0.058 0.11 0.218 0.211 0.108 0.164 0.076 — 0.139 0.064 0.16 — — 0.187 0.209 0.067 —
    Ce 6.97 14.33 20.31 19.19 7.38 9.44 17.63 22.01 10.29 15.85 16.2 7.79 8.29 6.16 14.92 5.04 5.95 17.36 12.61 6.21 6.53
    Pr 0.091 0.314 0.422 0.376 0.074 0.184 0.276 0.462 0.17 0.287 0.298 0.08 0.186 0.098 0.241 0.07 0.097 0.382 0.278 0.121 0.094
    Nd 1.17 3.11 5.09 4.76 1.12 2.22 4.31 4.69 2.04 3.64 3.59 0.99 1.51 1.22 2.19 0.73 1.09 4.65 3 1.45 0.84
    Sm 1.26 3.36 6.31 6.23 1.41 2.5 5.67 6.35 2.23 4.26 4.64 1.31 1.69 1.49 3.01 1.08 1.22 4.73 3.38 1.56 0.98
    Eu 1 2.12 3.56 3.56 0.96 1.56 3.25 3.76 1.41 2.83 2.85 0.99 1 0.845 2 0.638 0.84 2.75 1.96 0.9 0.8
    Gd 5.39 12.45 24.26 22.78 7.27 11.24 21.58 25.74 9.97 18.9 19.4 7.4 6.35 5.95 14.48 4.84 5.58 18.92 13.16 6 5.98
    Th 252.64 556.76 662.92 636.03 244.23 214.17 605.28 926.96 421.02 559.62 491.4 363.01 259.23 125.83 487.98 109.36 159.84 503.72 414.39 167.51 250.92
    Tb 2.04 4.25 8.23 7.68 2.38 3.74 7.25 8.5 3.65 6.2 6.88 2.69 2.12 1.95 5.3 1.59 1.87 6.3 4.47 2.01 2.17
    Dy 25.4 51.96 96.03 90.52 29.22 44.77 83.77 97.44 43.57 74.84 81.67 32.86 27.51 24.23 66.51 19.08 22.38 74.09 51.92 26.07 26.07
    Y 340.81 661.4 1254.05 1146.27 396.5 587.57 1067 1230 584.93 953.58 1068.56 433.54 367.1 320.22 914.16 256.9 318.19 968.57 647.71 344.3 352.1
    Ho 10.29 20.2 36.72 34.17 12.2 17.7 32.53 36.85 17.73 28.88 31.9 13.47 11.22 9.73 27.14 7.82 9.59 29.03 19.84 10.44 11.13
    Er 53.75 101.01 184.22 165.07 61.66 89.98 157.9 176.25 90.09 145.24 158.89 68.5 57.75 49.2 136.35 38.94 49.85 143.88 99.78 53.96 56.5
    U 269.19 481.04 453.15 395.75 237.65 203.85 439.67 560.01 373.11 402.76 374.4 343.33 250.23 140.86 355.71 110.48 188.15 376.46 299.68 182.04 258.38
    Tm 13.43 24.19 43.2 38.77 14.7 21.83 38.66 40.7 21.94 34.31 37.97 16.34 14.53 12.22 33.03 9.68 12.45 34.9 23.92 13.59 14.08
    Yb 169.13 292.98 511.43 454.99 177.93 264.06 456.96 474.28 262.13 401.95 447.9 196.76 183.49 150.25 395.25 119.49 156.39 405.31 281.28 167.82 168.68
    Lu 39.09 65.37 110.66 94.3 39.23 58.62 97.83 101.41 60.68 88.61 97.18 44.1 42.45 33.97 87.05 26.89 36.09 90.08 62.6 38.78 38.73
    Hf 6856 6135 5848 6435 7716 6154 6563 6263 6921 6030 6130 7702 5883 7656 5824 6474 6023 5979 5625 5802 6919
    Nb 0.287 0.494 0.8 0.76 0.34 0.35 0.55 0.87 0.469 0.55 0.6 0.288 0.275 0.257 0.6 0.208 0.225 0.522 0.46 0.236 0.306
    Ta 0.121 0.188 0.247 0.241 0.135 0.166 0.23 0.247 0.233 0.191 0.218 0.145 0.117 0.089 0.226 0.077 0.118 0.218 0.2 0.124 0.146
    Ti 3.21 17.64 7.52 7.26 3.8 6.19 10.51 7.15 4.91 27.42 7.07 2.8 3.48 4.11 15.58 3.41 4.34 6.89 9.37 4.37 3.64
    P 86 125 229 222 91 162 184 226 128 173 197 87 103 80 194 87 119 193 157 114 81
    ∑REE 329 596 1051 943 356 528 928 999 526 826 909 393 358 297 788 236 303 833 578 329 333
    Th/U 0.939 1.157 1.463 1.607 1.028 1.051 1.377 1.655 1.128 1.389 1.313 1.057 1.036 0.893 1.372 0.990 0.850 1.338 1.383 0.920 0.971
    (Sm/La)N — 25.144 44.028 74.809 37.657 35.205 40.289 46.617 31.984 40.237 94.572 — 18.833 36.063 29.141 — — 39.181 25.051 36.067 —
    (Lu/Gd)N 58.675 42.480 36.904 33.492 43.658 42.195 36.677 31.875 49.241 37.931 40.528 48.215 54.086 46.191 48.638 44.949 52.328 38.520 38.485 52.292 52.399
    Ce/Ce* — 13.781 16.269 21.363 27.619 16.269 17.622 17.284 18.619 17.912 26.393 — 12.641 19.071 18.629 — — 15.925 12.826 16.910 —
    Eu/Eu* 1.173 1.002 0.880 0.914 0.917 0.900 0.898 0.899 0.914 0.964 0.918 0.972 0.933 0.868 0.926 0.853 0.984 0.889 0.898 0.899 1.010
    注：(Sm/La)N表示元素球粒陨石标准化后的比值，球粒陨石标准化值据参考文献[42]，Ce/Ce*= CeN/(LaN×PrN)0.5
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    表 3  长沟河闪长质片麻岩锆石Lu-Hf同位素分析结果

    Table 3.  Zircon Lu-Hf isoplot data of Changgouhe dioritic gneiss

    点号 t/Ma 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf εHf(0) εHf(t) tDM1Hf/Ma tDM2Hf/Ma fLu/Hf
    比值 2σ
    1 441.4 0.029987 0.000927 0.282696 0.000012 -2.69 6.75 786.91 992.30 -0.97
    2 459.6 0.040193 0.001325 0.282790 0.000022 0.63 10.34 661.61 778.29 -0.96
    4 444.1 0.066658 0.002178 0.282724 0.000023 -1.69 7.44 772.59 950.44 -0.93
    5 462.4 0.014302 0.000483 0.282749 0.000015 -0.82 9.21 704.12 852.37 -0.99
    6 467.8 0.045459 0.001529 0.282806 0.000022 1.19 11.01 642.40 741.74 -0.95
    7 463.3 0.049045 0.001584 0.282755 0.000024 -0.62 9.09 716.84 860.50 -0.95
    9 448.1 0.066724 0.002160 0.282691 0.000027 -2.86 6.36 820.61 1022.58 -0.93
    10 464.0 0.068375 0.002172 0.282829 0.000023 2.02 11.57 619.37 703.52 -0.93
    12 460.3 0.063296 0.002090 0.282740 0.000027 -1.15 8.35 748.46 905.55 -0.94
    13 469.0 0.028483 0.000969 0.282739 0.000023 -1.17 8.85 727.34 880.45 -0.97
    14 446.7 0.050080 0.001629 0.282729 0.000022 -1.51 7.83 754.10 927.69 -0.95
    15 464.2 0.028625 0.000953 0.282724 0.000018 -1.69 8.23 747.63 915.82 -0.97
    16 444.1 0.022458 0.000777 0.282713 0.000016 -2.08 7.47 759.48 948.97 -0.98
    18 440.7 0.023757 0.000800 0.282725 0.000018 -1.67 7.79 743.91 925.80 -0.98
    20 442.0 0.035065 0.001182 0.282734 0.000024 -1.35 8.03 738.57 911.67 -0.96
    21 441.9 0.024024 0.000771 0.282718 0.000023 -1.90 7.60 752.34 938.95 -0.98
    23 486.1 0.017719 0.000697 0.282679 0.000031 -3.28 7.20 805.53 998.55 -0.98
    24 461.6 0.035518 0.001199 0.282750 0.000021 -0.78 9.01 716.01 864.31 -0.96
    26 463.2 0.032227 0.001092 0.282794 0.000023 0.77 10.63 651.68 762.41 -0.97
    28 441.3 0.027411 0.000933 0.282719 0.000027 -1.87 7.56 754.58 940.74 -0.97
    29 464.3 0.027870 0.001025 0.282735 0.000026 -1.30 8.60 733.51 892.43 -0.97
    注：εHf(t)= 10000×{[(176Hf/177Hf)S-(176Lu/177Hf)S×(eλt-1)]/[(176Hf/177Hf)CHUR, 0-(176Lu/177Hf)CHUR×(eλt-1)]-1}；tDM1Hf=1/λ×ln{1+ [(176Hf/177Hf)S-(176Hf/177Hf)DM]/[(176Lu/177Hf)S-(176Lu/177Hf)DM]}；tDM2Hf=tDM1Hf- (tDM1Hf- t) × [(fcc-fs)/(fcc-fDM)]；fLu/Hf=(176Lu/177Hf)S/ (176Lu/177Hf)CHUR- 1；其中：λ = 1.867 × 10-11/a[43]；(176Lu/177Hf)S和(176Hf/177Hf)S为样品测量值；(176Lu/177Hf)CHUR= 0.0332，(176Hf/177Hf)CHUR，0= 0.282772[40]；(176Lu/177Hf)DM=0.0384，(176Hf/177Hf)DM= 0.28325；(176Lu/177Hf)平均地壳= 0.015[44]；fcc=[(176Lu/177Hf)平均地壳/(176Lu/177Hf)CHUR]-1；fDM=[(176Lu/177Hf)DM/(176Lu/177Hf)CHUR]-1；t为锆石结晶年龄
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