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川西塔公松林口岩体LA-ICP-MS锆石U-Pb年龄与地球化学特征

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叶亚康, 周家云, 周雄. 川西塔公松林口岩体LA-ICP-MS锆石U-Pb年龄与地球化学特征[J]. 岩矿测试, 2020, 39(6): 921-933. doi: 10.15898/j.cnki.11-2131/td.202005060008
引用本文: 叶亚康, 周家云, 周雄. 川西塔公松林口岩体LA-ICP-MS锆石U-Pb年龄与地球化学特征[J]. 岩矿测试, 2020, 39(6): 921-933. doi: 10.15898/j.cnki.11-2131/td.202005060008
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Ya-kang YE, Jia-yun ZHOU, Xiong ZHOU. Zircon LA-ICP-MS U-Pb Age and Geochemical Features of the Songlinkou Pluton, Western Sichuan[J]. Rock and Mineral Analysis, 2020, 39(6): 921-933. doi: 10.15898/j.cnki.11-2131/td.202005060008
Citation: Ya-kang YE, Jia-yun ZHOU, Xiong ZHOU. Zircon LA-ICP-MS U-Pb Age and Geochemical Features of the Songlinkou Pluton, Western Sichuan[J]. Rock and Mineral Analysis, 2020, 39(6): 921-933. doi: 10.15898/j.cnki.11-2131/td.202005060008
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川西塔公松林口岩体LA-ICP-MS锆石U-Pb年龄与地球化学特征

  • 1.

    中国地质科学院矿产综合利用研究所, 四川 成都 610041

  • 2.

    中国地质调查局稀土资源应用技术创新中心, 四川 成都 610041

  • 3.

    中国地质调查局金属矿产资源综合利用技术研究中心, 四川 成都 610041

  • 基金项目:
    中国地质调查局地质调查项目“格陵兰岛西南部稀土-铀矿产资源潜力评价”（DD20190446）；中国地质调查局地质调查项目“四川九龙—可尔因大型锂资源基地综合调查评价”（DD20190185）
详细信息
    作者简介: 叶亚康, 硕士, 助理工程师, 主要从事矿床学、岩石学及相关研究。E-mail:835143358@qq.com

  • 中图分类号: P574;O657.63

Zircon LA-ICP-MS U-Pb Age and Geochemical Features of the Songlinkou Pluton, Western Sichuan

  • 1.

    Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Chengdu 610041, China

  • 2.

    Technology Innovation Center of Rare Earth Resources Development and Utilization, China Geological Survey, Chengdu 610041, China

  • 3.

    Research Center of Multipurpose Utilization of Metal Mineral Resources, China Geological Survey, Chengdu 610041, China

    摘要
  • 松林口岩体出露于松潘—甘孜造山带东缘，紧邻甲基卡超大型稀有金属伟晶岩型锂矿床，为确定松林口岩体侵位时代与物质来源，探讨该岩体与甲基卡成矿岩体的地球化学和含矿性差异，本文对采集的11件岩体样品，采用X射线荧光光谱法、电感耦合等离子体质谱法（ICP-MS）、激光剥蚀电感耦合等离子体质谱法（LA-ICP-MS）和多接收电感耦合等离子体质谱法（MC-ICP-MS），对岩石的主量和微量元素组成、锆石U-Pb年龄和锆石Lu-Hf同位素进行分析。结果表明：松林口岩体中富含闪长质暗色包体，SiO2含量介于56.56%~68.99%之间，全碱含量3.78%~6.82%，K2O/Na2O=1.02~1.93，里特曼指数σ=1.01~1.93，Mg#值总体为46.73~61.27，岩石属于高钾钙碱性Ⅰ型花岗岩系列，具有轻稀土富集的特点，LREE/HREE=2.67~8.31，LaN/YbN值为2.11~9.74，所有岩石样品均具有明显的负Eu异常；总体上松林口岩体及其包体富集LILE元素，Ta、Nb、P、Ti等HFSE元素相对亏损。松林口边部花岗闪长岩、中部二长花岗岩的锆石U-Pb年龄分别为212.6±1.0Ma（MSWD=0.55）、222.4±1.1Ma（MSWD=0.39），岩浆侵位时代为晚三叠世；二长花岗岩锆石Lu-Hf同位素结果εHf（t）介于-9.09~-6.86，二阶段模式年龄（TDMC）在1524.874~1666.002Ma之间，岩体物质来源是中元古代扬子克拉通基底物质部分熔融，并混有部分富集上地幔物质。甲基卡S型花岗岩为上地壳部分熔融形成的，与松林口岩体属不同的物质来源，且岩浆演化程度和成矿构造条件不同，这可能是松林口岩体不具有锂稀有金属成矿的主要原因。
    BACKGROUNDThe Songlinkou pluton is located in the eastern margin of the Songpan-Ganzi orogenic belt, which is adjacent to the pegmatite-type lithium deposit of Jiajika. OBJECTIVESTo explore the similarities and differences between Songlinkou pluton and Jiajika mineralized intrusive rocks, and to study geological conditions of mineralization and magma sources of the pluton. METHODSMajor and trace elements were determined by X-ray fluorescence spectrometry (XRF) and inductively coupled plasma-mass spectrometry (ICP-MS), respectively. Zircon U-Pb age and Hf isotopes were analyzed by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and multiple collector-inductively coupled plasma-mass spectrometry (MC-ICP-MS), respectively. RESULTSThe Songlinkou pluton contained diorite enclaves, and has SiO2 contents of 56.56%-68.99%, total alkali of 3.78%-6.82%, K2O/Na2O of 1.02-1.93, and Rittmann indices of 1.01-1.93. The rock has relative high Mg# values (Mg#=46.73-61.27). The rock belongs to the high-potassium calcium-alkaline type I granite series showed light rare earth enrichment with LREE/HREE ratios of 2.67-8.31, LaN/YbN of 2.11-9.74. All samples have strongly negative Eu anomaly. It was rich in LILE, and depleted in Ta, Nb, P and Ti. The zircon U-Pb results of the granodiorite and monzogranite were 212.6±1.0Ma (MSWD=0.55) and 222.4±1.1Ma (MSWD=0.39), respectively. The εHf(t) of zircon in monzogranite ranged from -9.09 to -6.86, and TDMC ranged from 1524.874Ma to 1666.002Ma. CONCLUSIONSThe Songliankou pluton is produced by the partial melting of the middle Proterozoic Yangtze craton basement mixed with the enriched upper mantle. The Jiajika S-type granite is formed by partial melting of the upper crust, and is different from Songliankou pluton in terms of magma sources, evolution and mineralization tectonic conditions; this may be the main reason why the Songlinkou pluton does not have lithium rare metal mineralization.
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  • 图 1  二长花岗岩、花岗闪长岩、暗色包体手标本及其镜下特征

    Figure 1. 

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    图 2  (a) 微量元素蛛网图和(b)稀土元素配分模式图(甲基卡二云母花岗岩数据引自文献[26]，原始地幔标准化值与球粒陨石标准化值引自文献[27])

    Figure 2. 

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    图 3  松林口岩体锆石U-Pb谐和图

    Figure 3. 

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    图 4  松林口岩体岩石类型图解(底图引自文献[28])

    Figure 4. 

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    表 1  松林口岩体的主量元素(%)和微量元素测试结果(×10-6)

    Table 1.  Anlytical results of major elements (%) and trace elements (×10-6) in Songlinkou Pluton

    元素 暗色包体 二长花岗岩 花岗闪长岩 甲基卡二云母花岗岩
    SLK-1H SLK-2H SLK-3H SLK-4H SLK-5H SLK-6H SLK-7H SLK-8H SLK-9H SLK-10H SLK-11H JJK
    SiO2 54.24 63.89 65.29 65.65 67.01 68.99 61.93 60.88 61.97 56.97 56.56 74.29
    TiO2 0.64 0.64 0.58 0.56 0.46 0.36 0.74 0.71 0.66 0.68 0.76 0.07
    Al2O3 15 15.83 15.78 15.66 15.58 15.25 15.84 16.09 15.78 14.65 15.34 14.51
    Fe2O3 1.15 0.79 0.8 0.55 0.88 0.34 1.41 1.12 1.32 1.77 1.41 0.47
    FeO 6.68 4.33 3.96 3.75 3.11 2.66 4.75 5.19 4.81 6.32 6.53 0.4
    MnO 0.29 0.12 0.11 0.11 0.095 0.076 0.095 0.096 0.087 0.12 0.12 0.03
    MgO 5.79 2.7 2.41 2.52 1.92 1.49 3.51 3.93 3.71 6.79 6.92 0.24
    CaO 7.42 4.3 4.06 4.14 3.38 3.46 5.51 5.96 5.34 8.13 8.01 0.48
    Na2O 1.4 2.2 2.28 2.15 2.44 2.54 2.21 2.03 1.95 1.84 1.91 3.23
    K2O 5.94 3.66 4 4.16 4.38 4.28 3.17 2.86 3.28 1.94 1.95 4.79
    P2O5 0.16 0.14 0.14 0.12 0.097 0.086 0.17 0.17 0.16 0.16 0.18 0.22
    Mg# 57.22 48.84 47.86 51.41 46.73 47.24 50.97 53.06 52.44 60.47 61.27 34.21
    烧失量 0.87 0.97 0.9 0.63 0.73 0.49 0.67 0.89 0.83 0.26 0.13 1.02
    总量 99.58 99.57 100.31 100 100.08 100.02 100 99.92 99.9 99.63 99.82 100.56
    A/CNK 0.675 1.028 1.021 1.006 1.046 1.01 0.927 0.932 0.958 0.736 0.774 1.27
    Li 46.2 51.2 51.0 49.8 63.3 57.8 42.8 33.3 27.3 46.1 26.5 447
    Cs 12.0 14.2 14.0 13.8 15.9 16.2 10.7 8.63 6.05 9.75 5.86 42.4
    Rb 244 180 182 184 186 190 155 144 134 82.5 83.1 401
    Ba 1380 642 584 581 617 604 704 620 698 559 600 107
    Th 7.08 15.1 21 21.9 25.8 23.5 14.5 12.3 14.2 6.9 8.02 3.56
    U 2.7 2.66 1.72 2.11 2.82 3.12 1.87 1.72 1.92 1.25 1.6 3.94
    Ta 1.06 1.36 1.25 1.32 1.55 1.59 1.31 1.12 1.44 0.76 0.89 4.93
    Nb 10.6 13.2 12 12.6 12.8 11.4 15.2 12.9 13.2 9.36 9.79 18.9
    Sr 261 274 247 242 291 285 612 618 579 658 683 104
    Zr 121 155 150 164 156 132 135 130 120 72 70 35
    Hf 2.78 5.01 5.25 5.43 4.42 3.83 1.62 1.61 2.17 1.51 1.81 3.34
    Y 43.4 28 29.2 28.5 28.2 24.8 37.5 35.3 32.7 29 32.6 9.58
    Ga 16.3 19.5 17.8 18.5 18.4 18 18.9 18.7 18.9 20.6 20.1 22.3
    La 12 37.2 26.9 35.8 28.4 32 42.6 32 37.3 22.6 30.8 7.02
    Ce 23.4 67.5 70.2 68.2 74.6 71.4 72.2 49.6 48.1 30.5 46.6 11.40
    Pr 4.47 7.9 5.9 7.8 6.28 7.3 8.91 7.52 7.78 5.16 7.1 1.92
    Nd 20.9 28.4 22.4 27.4 21.8 28.1 38.6 35.5 37 24.4 34.3 6.78
    Sm 6.74 5.44 4.78 5.54 5.12 5.4 6.6 5.88 6 4.31 5.93 1.80
    Eu 1.32 1.1 1.06 1.08 1.04 0.98 1.36 1.36 1.41 1.09 1.39 0.36
    Gd 6.48 4.92 4.9 5.28 5.36 5.22 7.15 6.34 6.41 4.68 5.62 2.19
    Tb 1.15 0.79 0.78 0.82 0.87 0.77 1.07 0.95 1.05 0.79 0.89 0.43
    Dy 7.22 4.68 4.82 4.99 5.2 4.46 6.36 5.23 5.95 4.51 5.76 2.12
    Ho 1.38 0.93 0.94 0.94 0.96 0.86 1.23 1.05 1.35 0.92 1.17 0.32
    Er 4.14 2.84 2.87 2.92 2.78 2.64 3.57 3.27 3.75 2.59 3.57 0.61
    Tm 0.71 0.48 0.5 0.5 0.5 0.45 0.55 0.55 0.54 0.41 0.59 0.08
    Yb 4.07 2.74 2.92 2.91 2.94 2.68 3.41 3.08 3.57 2.56 3.61 0.45
    Lu 0.62 0.44 0.44 0.46 0.42 0.39 0.53 0.52 0.57 0.42 0.6 0.07
    ΣREE 94.6 165.36 149.41 164.64 156.27 162.65 194.14 152.85 160.77 104.93 147.93 35.56
    LREE 68.83 147.54 131.24 145.82 137.24 145.18 170.27 131.86 137.59 88.06 126.12 -
    HREE 25.77 17.82 18.17 18.82 19.03 17.47 23.87 20.99 23.18 16.87 21.81 -
    LREE/
    HREE    		 2.67 8.28 7.22 7.75 7.21 8.31 7.13 6.28 5.94 5.22 5.78 4.66
    LaN/YbN 2.11 9.74 6.61 8.82 6.93 8.56 8.96 7.45 7.49 6.33 6.12 -
    δEu 0.6 0.64 0.66 0.6 0.6 0.56 0.6 0.68 0.69 0.74 0.73 0.55
    δCe 0.78 0.92 1.31 0.96 1.31 1.1 0.86 0.76 0.66 0.67 0.74 -
    注：SiO2至A/CNK第一部分为主量元素(%)，Li至Ga第二部分为微量元素(×10-6)，La至δCe第三部分为稀土元素(×10-6)。
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    表 2  松林口岩体锆石U-Pb同位素分析结果

    Table 2.  LA-ICP-MS zircon U-Pb isotopic compositions of Songlinkou Pluton

    分析点号 Pb*含量
    (×10-6)    		 Th含量
    (×10-6)    		 U含量
    (×10-6)    		 Th/U 同位素比值
    207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ
    SLK-11-01 56.64 150.87 353.98 0.43 0.05063 0.00125 0.23573 0.00406 0.03376 0.00037
    SLK-11-02 29.21 65.61 185.87 0.35 0.05083 0.00223 0.23451 0.00924 0.03346 0.00045
    SLK-11-03 46.68 101.61 295.63 0.34 0.05047 0.00128 0.23455 0.00424 0.03370 0.00037
    SLK-11-04 83.23 179.68 528.79 0.34 0.05074 0.00118 0.23523 0.00357 0.03362 0.00036
    SLK-11-05 33.486 72.69 218.87 0.33 0.05107 0.00194 0.23069 0.00765 0.03276 0.00042
    SLK-11-06 106.98 123.53 693.50 0.18 0.05131 0.00127 0.23804 0.00409 0.03364 0.00037
    SLK-11-07 38.821 144.58 235.26 0.61 0.05159 0.00142 0.23987 0.00501 0.03372 0.00038
    SLK-11-08 35.00 86.43 221.44 0.39 0.05103 0.00222 0.23588 0.00922 0.03352 0.00045
    SLK-11-09 61.10 318.89 420.06 0.76 0.05075 0.00211 0.20386 0.00754 0.02913 0.00039
    SLK-11-10 40.422 148.99 245.40 0.61 0.04994 0.00145 0.23343 0.00531 0.03389 0.00039
    SLK-11-11 37.153 84.32 234.42 0.36 0.05027 0.00137 0.23371 0.00478 0.03371 0.00038
    SLK-11-12 21.54 58.71 136.11 0.43 0.0508 0.00242 0.23304 0.01012 0.03326 0.00047
    SLK-11-13 24.96 57.98 156.93 0.37 0.05052 0.00198 0.23509 0.00809 0.03375 0.00043
    SLK-11-14 25.957 73.91 161.14 0.46 0.05035 0.00202 0.23444 0.0083 0.03377 0.00043
    SLK-11-15 18.849 50.24 108.83 0.46 0.05102 0.00227 0.25419 0.01023 0.03613 0.00049
    SLK-11-16 57.82 222.12 350.44 0.63 0.05069 0.00128 0.23532 0.00421 0.03366 0.00037
    SLK-11-17 30.219 84.20 189.56 0.44 0.05169 0.00184 0.23744 0.00722 0.03331 0.00041
    SLK-11-18 27.533 65.75 171.62 0.38 0.05011 0.00145 0.23412 0.00533 0.03388 0.00038
    SLK-11-19 104.42 158.77 676.60 0.23 0.05184 0.00275 0.23723 0.01164 0.03318 0.00051
    SLK-11-20 55.72 185.00 346.59 0.53 0.05078 0.00121 0.23304 0.00375 0.03328 0.00036
    SLK-11-21 41.054 149.45 248.96 0.60 0.05122 0.00196 0.23599 0.00788 0.03341 0.00043
    SLK-11-22 74.34 344.04 451.63 0.76 0.05069 0.00139 0.23041 0.0048 0.03296 0.00037
    SLK-11-23 82.25 322.94 501.36 0.64 0.05123 0.00131 0.23574 0.00433 0.03337 0.00037
    SLK-11-24 29.707 93.44 184.54 0.51 0.05100 0.00146 0.23402 0.00521 0.03328 0.00037
    SLK-11-25 33.925 110.45 209.54 0.53 0.05084 0.00153 0.23457 0.00567 0.03346 0.00038
    SLK-11-26 48.34 177.72 292.96 0.61 0.05036 0.00356 0.23471 0.01576 0.03380 0.00063
    SLK-11-27 65.99 216.38 402.21 0.54 0.05029 0.00135 0.2346 0.00471 0.03383 0.00037
    SLK-11-28 39.081 81.65 245.39 0.33 0.05224 0.00137 0.24249 0.00466 0.03366 0.00037
    SLK-11-29 169.72 169.25 515.19 0.33 0.05676 0.00136 0.54385 0.00879 0.06948 0.00075
    SLK-11-30 81.29 345.48 500.64 0.69 0.05236 0.00131 0.23671 0.00418 0.03279 0.00036
    SLK-06-01 151.87 266.79 885.26 0.30 0.05113 0.00149 0.24902 0.00584 0.03531 0.00043
    SLK-06-02 173.20 329.11 1005.81 0.33 0.05122 0.00130 0.24950 0.00468 0.03532 0.00041
    SLK-06-03 95.64 200.62 615.96 0.33 0.04999 0.00165 0.21905 0.00613 0.03177 0.00040
    SLK-06-04 63.17 157.03 363.30 0.43 0.05218 0.00171 0.25251 0.00695 0.03509 0.00044
    SLK-06-05 56.47 122.37 324.75 0.38 0.05049 0.00176 0.24703 0.00740 0.03548 0.00046
    SLK-06-06 101.41 225.69 586.61 0.38 0.05113 0.00147 0.2488 0.00570 0.03528 0.00042
    SLK-06-07 46.086 108.19 264.22 0.41 0.05066 0.00220 0.24793 0.00973 0.03549 0.00050
    SLK-06-08 72.29 170.67 420.51 0.41 0.05335 0.00193 0.25708 0.00807 0.03494 0.00046
    SLK-06-09 105.57 209.11 618.89 0.34 0.05109 0.00150 0.24735 0.00583 0.03510 0.00042
    SLK-06-10 82.54 162.46 492.95 0.33 0.05198 0.00166 0.24668 0.00659 0.03441 0.00043
    SLK-06-11 39.019 80.67 203.85 0.40 0.05106 0.00221 0.27473 0.01074 0.03901 0.00055
    SLK-06-12 56.83 152.75 325.63 0.47 0.05155 0.00212 0.25021 0.00920 0.03519 0.00049
    SLK-06-13 101.06 200.54 596.58 0.34 0.05054 0.00140 0.24339 0.00526 0.03492 0.00041
    SLK-06-14 55.41 136.95 322.98 0.42 0.05096 0.00181 0.24575 0.00757 0.03497 0.00045
    SLK-06-15 72.44 162.12 424.80 0.38 0.05093 0.00163 0.24520 0.00654 0.03491 0.00043
    SLK-06-16 58.02 119.70 339.89 0.35 0.05139 0.00188 0.24867 0.00791 0.03509 0.00046
    SLK-06-17 95.81 212.55 559.18 0.38 0.05070 0.00151 0.24555 0.00591 0.03512 0.00043
    SLK-06-18 57.07 127.08 331.51 0.38 0.05055 0.00197 0.24566 0.00845 0.03524 0.00047
    SLK-06-19 163.87 370.36 956.33 0.39 0.05102 0.00135 0.24779 0.00499 0.03522 0.00041
    SLK-06-20 85.69 190.97 502.85 0.38 0.05176 0.00151 0.25010 0.00583 0.03504 0.00042
    SLK-06-21 59.90 194.13 344.10 0.56 0.05185 0.00193 0.24960 0.00810 0.03491 0.00046
    SLK-06-22 128.26 272.28 752.88 0.36 0.05141 0.00160 0.24927 0.00640 0.03516 0.00043
    SLK-06-23 68.42 117.02 412.09 0.28 0.05140 0.00195 0.24537 0.00820 0.03461 0.00046
    SLK-06-24 54.49 122.56 317.91 0.39 0.05072 0.00176 0.24693 0.00737 0.03530 0.00045
    SLK-06-25 80.62 188.64 477.69 0.39 0.05117 0.00278 0.24506 0.01242 0.03473 0.00056
    SLK-06-26 61.29 145.86 394.04 0.37 0.05063 0.00272 0.22409 0.01118 0.03209 0.00051
    SLK-06-27 71.59 154.31 418.06 0.37 0.05091 0.00159 0.24831 0.00639 0.03537 0.00043
    SLK-06-28 48.96 98.41 260.17 0.38 0.05205 0.00179 0.27804 0.00820 0.03874 0.00049
    SLK-06-29 57.52 133.24 341.54 0.39 0.05119 0.00170 0.24531 0.00690 0.03475 0.00044
    SLK-06-30 81.30 155.89 474.66 0.33 0.05212 0.00163 0.25625 0.00665 0.03565 0.00044
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    表 3  松林口岩体锆石Hf同位素分析结果

    Table 3.  Hf isotopic compositions of zirconium in Songlinkou Pluton

    分析点号 U-Pb年龄 同位素比值 模式年龄(Ma)
    (Ma) 1σ 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ εHf(t) TDM1 TDMC
    SLK-06-01 222.3 2.7 0.0331 0.000491 0.000872 0.000012 0.282525 0.000021 -8.74 1025.0300 1643.900
    SLK-06-02 224.7 2.8 0.0285 0.000176 0.000742 0.000004 0.282552 0.000018 -7.79 983.9629 1583.523
    SLK-06-03 223.5 2.6 0.0238 0.000197 0.000643 0.000004 0.282515 0.000016 -9.09 1032.515 1666.002
    SLK-06-04 224.8 3.1 0.0281 0.000340 0.000730 0.000008 0.282531 0.000016 -8.52 1012.696 1630.259
    SLK-06-05 221.3 2.6 0.0143 0.000017 0.000384 0.000001 0.282551 0.000015 -7.83 976.3242 1586.131
    SLK-06-06 221.6 2.8 0.0182 0.000057 0.000491 0.000001 0.282558 0.000022 -7.56 968.4969 1569.008
    SLK-06-07 222.3 2.9 0.0207 0.000095 0.000561 0.000002 0.282517 0.000014 -9.01 1027.225 1661.096
    SLK-06-08 223.1 2.6 0.0243 0.000326 0.000671 0.000008 0.282578 0.000018 -6.86 945.7365 1524.874
    SLK-06-09 222.0 2.6 0.0221 0.000041 0.000595 0.000001 0.282548 0.000016 -7.94 986.1739 1593.243
    SLK-06-10 221.2 2.9 0.0276 0.000476 0.000762 0.000014 0.282565 0.000022 -7.33 966.5966 1554.746
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