Geochronology, Geochemistry and Geological Significance of Volcanic Rocks of the Dianzhong Formation, Shiquanhe Area, Western Lhasa Block
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摘要: 广泛分布于拉萨地块南部的林子宗群火山岩被认为是新特提斯洋北向俯冲消减到陆陆碰撞构造背景转化过程中的岩浆作用产物，记录了从新特提斯洋俯冲到印度-欧亚板块碰撞、后碰撞的丰富信息.对狮泉河地区的林子宗群典中组火山岩样品进行了详细的年代学、元素及同位素地球化学研究.结果显示典中组火山岩样品LA-ICP-MS锆石U-Pb年龄集中在67.1±1.7 Ma至70.8±1.1 Ma，表明其形成于白垩纪晚期.火山岩岩性主要包括玄武安山岩、安山岩、流纹岩等，其中，中基性火山岩为一套低钾拉斑-钙碱性系列岩石，具有低TiO2（平均值< 1%），高Al2O3（平均值>15%），均富集K、Rb、Th、U等大离子亲石元素（LILE），亏损Nb、Ta、Zr、Ti等高场强元素（HFSE），具有弧岩浆岩的地球化学特征.两件中基性岩样品（87Sr/86Sr）i比值分别为0.707 437、0.707 672，εNd（t）值分别为-5.06和-4.31.酸性火山岩为一套高钾钙碱性岩石，具有高的SiO2（76.01%~76.77%）、高K2O（4.93%~4.98%）、高K2O/Na2O（1.41%~1.45%）以及相对高的Mg#（平均值为45.38），富集K、Rb、Th、U等大离子亲石元素（LILE），亏损Nb、Ta、Zr、Ti等高场强元素（HFSE），具有明显的Eu和Sr负异常.以上特征暗示典中组中基性火山岩可能是新特提斯洋北向俯冲消减过程中板片流体引起上覆地幔楔部分熔融的产物，且在上升过程中受到地壳混染的影响，酸性岩则可能来源于上覆地壳的部分熔融，且受到少量幔源物质的影响.此外，年代学及地球化学特征均表明本研究样品不属于前人认为的则弄群火山岩，而应重新厘定为林子宗群典中组火山岩.Abstract: Volcanic rocks of the Linzizong Group are widely distributed in the southern part of the Lhasa Block, and are considered to related with tectonic settings during the transition from the northward subduction of Neo-Tethys to continent-continent collision.In this paper, we present detailed chronology, elemental geochemistry and isotope geochemistry of volcanic rock samples from the Linzizong Group, Shiquanhe area. The results show that LA-ICP-MS U-Pb zircon ages from volcanic rock samples of the Dianzhong Formation are mostly between 67.1±1.7 Ma and 70.8±1.1 Ma, establishing a Late Cretaceous age.The Dianzhong Formation in the study area comprises basaltic andesite, andesite and rhyolite. Medium-basic volcanic rocks belong to the potassium calcium-alkaline series, with low TiO2 (average < 1%) and high Al2O3 (average > 15%) contents, and are enriched in large ion lithophile elements (LILE), such as K, Rb, Th, and U, and depleted in high field strength elements (HFSE) such as Nb, Ta, Zr and Ti, thereby showing obvious island-arc volcanic affinity.The isotope study yields (87Sr/86Sr)i ratios of 0.707 437, 0.707 672, and εNd(t) of -5.06 and -4.30. The acid volcanic rocks have high SiO2 (76.01%-76.77%), high K2O (4.93%-4.98%) and high K2O/Na2O (1.41%-1.45%), and belong to the high potassium calc-alkaline series, with a relatively high Mg# (average 45.38), enrichment of large ion lithophile elements (LILE) such as K, Rb, Th, U, depletion of high field strength elements (HFSE) such as Nb, Ta, Zr, Ti, and have significant negative Eu and Sr anomalies. The above characteristics suggest that the medium-basic volcanic rocks of the Dianzhong Formation were generated from partial melting of the overlying mantle wedge during northward subduction of Neo-Tethys, and were crustally contaminated during emplacement, whereas the acidic rocks may have been derived from partial melting of the overlying crust and the addition of a small amount of mantle material.In addition, both chronology and geochemical characteristics indicate that rock units sampled during this study are not part of the Zenong Group, as considered by the previous studies, but should be redefined as volcanic rocks of the Linzizong Group.
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Key words:
- U-Pb zircon dating /
- volcanic rock /
- Dianzhong Formation /
- Linzizong Group /
- Lhasa Block /
- geochemistry
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图 1 西藏拉萨地块林子宗群火山岩分布
Fig. 1. Simplified map of the Linzizong Group volcanic rocks in Lhasa Block, Tibet
图 4 狮泉河地区典中组火山岩样品镜下照片
Qtz.石英斑晶; Hbl.角闪石; Pl.斜长石斑晶; Kfs.钾长石; Bt.黑云母
Fig. 4. Micro photographs of volcanic rock samples from the Dianzhong Formation in Shiquanhe area
图 5 狮泉河地区典中组火山岩样品锆石颗粒阴极发光图像、测点及年龄值
Fig. 5. CL images of analytical spots and ages of some zircons of the Dianzhong Formation volcanic rocks in Shiquanhe area
图 6 狮泉河地区典中组火山岩锆石U-Pb谐和图
Fig. 6. Zircon U-Pb concordia diagrams of the Dianzhong Formation volcanic rocks in Shiquanhe area
图 7 典中组火山岩Zr/TiO2-Nb/Y图解(a)和SiO2-K2O图解(b)
a.据Winchester and Floyd(1976); b.据Miyashiro(1974); 林周、朱诺数据引自文献Mo et al.(2007, 2008); 梁银平等(2010); 则弄群火山岩数据1, 2分别引自文献康志强等(2008); 王力圆等(2016)
Fig. 7. Zr/TiO2-Nb/Y (a) and SiO2-K2O (b) diagrams of the Dianzhong Formation
图 8 典中组火山岩Na2O-K2O判别图解(a)和A/CNK-A/NK图解(b)
数据来源同图 6
Fig. 8. Na2O-K2O (a) and A/CNK-A/NK (b) diagrams of the Dianzhong Formation volcanic rocks
图 9 狮泉河地区典中组火山岩球粒陨石标准化稀土元素配分图(a, c)和原始地幔标准化微量元素蛛网图(b, d)
数据来源同图 6; 球粒陨石标准化值据Taylor and Mclennan (1985)和原始地幔标准化值据Sun and McDonough(1989)
Fig. 9. Chondrite-normalized rare earth elements distribution patterns (a, c) and primitive mantle-normalized incompatible elements of the Dianzhong Formation volcanic rocks in Shiquanhe area (b, d)
图 10 典中组火山岩εNd(t)-(87Sr/86Sr)i判别图
数据来源同图 6
Fig. 10. εNd(t)-(87Sr/86Sr)i discrimination diagram of the Dianzhong Formation volcanic rocks
图 11 典中组火山岩Ce-Ce/Pb图解(a)和Nb-Nb/Th图解(b)
据文献Boztug et al.(2007); 其中原始地幔据Hofman(1988), 大陆地壳、MORB+OIB和岛弧型火山岩区域据Schmidberger and Henger(1999)
Fig. 11. Ce-Ce/Pb (a) and Nb-Nb/Th (b) diagrams of the volcanic rocks in the Dianzhong Formation
图 12 大典中组火山岩La/Yb-Sm/Yb判别图解(a)和(Th/Nb)N-Nb/La图解(b)
a.据Johnson et al.(1990); b.据Kieffer et al.(2004); 标准化数值据Sun and McDonough(1989)
Fig. 12. La/Yb-Sm/Yb (a) and (Th/Nb)N-Nb/La (b) diagrams of the volcanic rocks in the Dianzhong Formation
图 13 典中组火山岩平衡部分熔融与分离结晶作用图解(a)和Ba/La-La/Yb图解(b)
数据来源同图 6; 沉积物和板片熔体成分区据Yogodzinski et al.(1995); 消减沉积物流体平均成分据Aizawa et al.(1999); 消减玄武质地壳流体平均成分据Kogiso et al.(1997); N-MORB值据Sun and Mcdonough(1989)
Fig. 13. Equilibrium partial and separation crystallization diagram (a) and Ba/La-La/Yb diagram (b) of the Dianzhong Formation volcanic rocks
图 14 狮泉河地区典中组火山岩Hf-Th-Ta图解(a)和Th/Yb-Ta/Yb图解(b)
a.据Wood(1980); b.据Pearce and Peate(1995); 数据来源同图 6
Fig. 14. Hf-Th-Ta (a) and Th/Yb-Ta/Yb (b) diagrams of the Dianzhong Formation volcanic rocks from Shiquanhe area
表 1 狮泉河地区林子宗群典中组火山岩样品概况
Table 1. Petrography of studied samples from the Dianzhong Formation, Lizizong Group, in Shiquanhe area, western Lhasa Block
样品号 岩石名称 组 采样位置 岩性描述 15DA-01 安山岩 多爱组 32°16'54"N 80°05'03"E 斑晶为斜长石(~35%)、黑云母(~30%)及石英(~2%), 粒径为0.01~2.1 mm; 基质主要由微晶斜长石及暗色矿物蚀变后的绢云母化和绿帘石, 少量辉石蚀变后的绿泥石矿物, 含量约为32%;副矿物为磁铁矿和少量赤铁矿, 含量约为1%(图 3). 15DA-02 安山岩 多爱组 32°16'42"N 80°04'49"E 斑晶为斜长石(~30%)、石英(~10%), 粒径为0.96~1.9 mm; 基质由斜长石微晶及火山玻璃质矿物组成, 斜长石微晶普遍绢云母化, 呈现交织结构, 含量约为60%(图 4). 15DA-05 安山岩 多爱组 32°10'40"N 80°21'07"N 斑晶主要为斜长石(~55%)、黑云母(~5%), 粒径为0.19~2.0 mm; 基质主要成分为微晶斜长石、微晶黑云母、石英及暗色铁质矿物, 呈显微-粒状隐晶质结构, 含量约为40%(图 4). 15DA-06 闪长玢岩 多爱组 32°11'04"N 80°21'55"E 斑晶主要为斜长石(~50%)、角闪石(~20%), 暗色矿物为磁铁矿(~5%), 粒径为0.1~1.2 mm; 基质主要为黑云母化后的斜长石, 以及暗色矿物的黑云母和次角闪石化, 约占~25%(图 4). 15DA-07 玄武安山岩 多爱组 32°11'51"N 80°23'27"E 斑晶主要为斜长石(~60%)发育聚片双晶, 半自形结构, 角闪石(~10%)发生绿泥石化, 粒径为0.25~1.2 mm; 基质约占(30%), 主要成分为微斜长石、磁铁矿和玻璃质, 呈交织结构(图 4). 15DA-09 安山岩 多爱组 32°12'20"N 80°25'07"E 斑晶主要为斜长石(~45%)发育聚片双晶, 自形-半自形结构, 有轻微的绢云母化, 暗色矿物黑云母(~15%)发育一组完全解理, 其他暗色矿物(~5%)外形保留, 原生矿物发生完全蚀变, 被绿泥石, 绿帘石取代, 并析出磁铁矿, 粒径为0.2~1.5 mm; 基质含量约为35%, 主要由斜长石微晶和玻璃质组成(图 4). 15TC-01 流纹岩 拖称组 32°06'02"N 80°53'03"E 斑晶为碱性长石(~30%)、石英(~25%)、斜长石(~10%)及少量黑云母(~5%), 粒径为0.02~1.7 mm, 除石英外, 多数矿物经历了一定程度的蚀变; 基质含量约为30%, 主要为微晶石英和隐晶质的钾长石、斜长石组成, 其中的石英主要来自二次结晶, 充填于斑晶长石周围(图 4). 15TC-02 流纹岩 拖称组 32°06'23"N 80°52'35"E 斑晶为钾长石(~20%)、石英(~25%)、斜长石(~10%)及黑云母(~2%), 粒径为0.02~1.1 mm.基质含量约为43%, 主要由细粒长石类矿物和石英颗粒组成(图 4). 
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表 2 狮泉河地区林子宗群典中组火山岩(15TC-01、15TC-02、15DA-05)锆石U-Th-Pb同位素测定结果
Table 2. U-Th-Pb isotope composition of zircons from volcanic rocks (15TC-01, 15TC-02, 15DA-05) of the Dianzhong Formation, Linzizong Group, in Shiquanhe area
分析点号 Th(10-6) U(10-6) Th/U 同位素比值及误差 年龄及误差(Ma) 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 206Pb/238U 1σ 15TC-01-01 2 111 1 616 1.31 0.071 0 0.004 0.011 1 0.000 2 69.7 4.0 70.9 1.2 15TC-01-02 612 490 1.25 0.115 6 0.007 0.011 1 0.000 3 111.0 6.6 70.9 2.0 15TC-01-03 562 477 1.18 0.150 2 0.009 0.011 1 0.000 3 142.1 7.8 71.4 2.0 15TC-01-04 2 748 1 368 2.01 0.081 7 0.005 0.010 9 0.000 2 79.7 4.5 70.1 1.4 15TC-01-05 2 470 1 837 1.34 0.080 2 0.005 0.010 9 0.000 2 78.4 4.3 69.6 1.2 15TC-01-06 2 212 1 969 1.12 0.070 4 0.004 0.010 7 0.000 2 69.0 4.2 68.5 1.2 15TC-01-07 8 308 2 480 3.35 0.131 3 0.012 0.010 9 0.000 2 125.3 10.3 70.0 1.2 15TC-01-09 2 361 1 720 1.37 0.083 0 0.005 0.010 9 0.000 2 81.0 4.8 69.6 1.4 15TC-01-10 3 472 1 626 2.13 0.081 5 0.005 0.010 9 0.000 2 79.6 4.4 70.0 1.1 15TC-01-12 2 984 1 765 1.69 0.087 9 0.005 0.011 1 0.000 2 85.5 5.0 71.0 1.3 15TC-01-15 3 655 2 318 1.58 0.115 7 0.008 0.011 1 0.000 2 111.2 7.5 70.9 1.4 15TC-01-17 2 691 1 871 1.44 0.080 5 0.005 0.010 9 0.000 2 78.6 4.6 69.8 1.0 15TC-01-18 5 527 2 017 2.74 0.081 3 0.005 0.010 9 0.000 2 79.4 4.3 70.0 1.1 15TC-01-19 2 494 1 871 1.33 0.116 0 0.010 0.011 1 0.000 2 111.5 8.9 71.3 1.3 15TC-01-20 1 038 715 1.45 0.100 9 0.007 0.011 1 0.000 3 97.6 6.5 71.0 1.7 15TC-01-21 3 765 3 380 1.11 0.072 3 0.003 0.011 1 0.000 2 70.9 3.1 71.0 1.2 15TC-01-22 2 594 1 823 1.42 0.085 5 0.004 0.011 1 0.000 2 83.3 4.1 71.3 1.2 15TC-01-23 2 314 1 772 1.31 0.075 0 0.005 0.010 9 0.000 2 73.4 4.4 70.1 1.2 15TC-01-24 2 585 1 596 1.62 0.085 1 0.004 0.011 2 0.000 2 82.9 4.1 71.5 1.0 15TC-01-25 2 868 1 977 1.45 0.084 6 0.005 0.010 7 0.000 2 82.5 4.8 68.5 1.3 15TC-02-01 861 704 1.22 0.083 0 0.005 0.011 1 0.000 4 80.9 4.8 71.1 2.5 15TC-02-04 1 667 1 299 1.28 0.080 1 0.005 0.011 0 0.000 4 78.3 4.5 70.7 2.4 15TC-02-05 1 263 647 1.95 0.096 6 0.007 0.011 5 0.000 4 93.7 6.0 73.7 2.7 15TC-02-07 503 392 1.28 0.144 0 0.011 0.011 5 0.000 4 136.6 9.9 73.5 2.8 15TC-02-08 1 814 929 1.95 0.079 2 0.005 0.011 1 0.000 4 77.4 4.8 71.4 2.5 15TC-02-09 4 876 1 504 3.24 0.071 6 0.004 0.010 8 0.000 4 70.2 3.8 69.5 2.4 15TC-02-11 5 013 1 477 3.39 0.073 5 0.004 0.011 1 0.000 4 72.0 4.0 71.0 2.4 15TC-02-12 1 536 1 395 1.10 0.078 5 0.004 0.011 1 0.000 4 76.7 4.2 71.1 2.5 15TC-02-13 3 152 2 149 1.47 0.072 5 0.004 0.010 9 0.000 4 71.0 3.7 69.9 2.4 15TC-02-14 4 417 1 470 3.00 0.071 90 0.005 0.011 5 0.000 4 70.5 4.3 73.5 2.6 15TC-02-15 1 815 759 2.39 0.090 20 0.007 0.011 3 0.000 4 87.7 6.3 72.4 2.7 15TC-02-16 1 073 864 1.24 0.085 30 0.005 0.011 3 0.000 4 83.1 4.8 72.5 2.6 15TC-02-17 3 377 2 001 1.69 0.072 40 0.004 0.010 5 0.000 4 70.9 3.6 67.1 2.3 15TC-02-19 739 529 1.40 0.096 60 0.006 0.010 9 0.000 4 93.6 5.9 70.1 2.6 15TC-02-20 3 891 1 584 2.46 0.091 00 0.006 0.010 8 0.000 4 88.5 5.6 69.3 2.4 15TC-02-21 3 774 1 238 3.05 0.084 60 0.005 0.010 9 0.000 4 82.5 4.9 70.0 2.4 15TC-02-22 2 057 1 577 1.30 0.109 30 0.008 0.010 9 0.000 4 105.3 7.1 70.0 2.4 15TC-02-23 2 111 1 499 1.41 0.077 90 0.005 0.011 2 0.000 4 76.1 4.3 72.1 2.5 15TC-02-25 2 592 1 847 1.40 0.081 80 0.005 0.010 8 0.000 4 79.8 4.2 69.1 2.3 15DA-05-1 253 362 0.70 0.251 41 0.016 0.029 9 0.000 6 227.7 13.0 190.0 4.0 15DA-05-2 613 996 0.62 0.091 60 0.007 0.010 3 0.000 2 89.0 6.5 66.0 1.5 15DA-05-3 124 257 0.48 1.322 19 0.053 0.151 0 0.002 3 855.5 23.2 906.6 12.7 15DA-05-4 368 441 0.83 0.413 82 0.039 0.013 2 0.000 5 351.6 27.7 84.8 2.9 15DA-05-5 498 628 0.79 0.203 66 0.014 0.013 0 0.000 4 188.2 11.6 83.3 2.4 15DA-05-6 433 540 0.80 0.156 80 0.013 0.010 4 0.000 3 147.9 11.6 66.9 1.9 15DA-05-7 228 363 0.63 0.181 00 0.012 0.011 2 0.000 4 168.9 10.2 71.7 2.2 15DA-05-8 453 607 0.75 0.105 20 0.007 0.010 3 0.000 3 101.5 6.1 66.0 1.8 15DA-05-9 413 512 0.81 0.455 18 0.035 0.013 4 0.000 6 380.9 24.3 85.8 3.7 15DA-05-10 304 415 0.73 0.500 79 0.048 0.012 3 0.000 5 412.2 32.2 79.0 3.4 15DA-05-11 397 441 0.90 0.383 45 0.063 0.012 4 0.000 6 329.6 46.2 79.2 3.9 15DA-05-12 365 524 0.70 0.141 20 0.009 0.009 8 0.000 3 134.2 7.9 63.0 1.7 15DA-05-13 568 505 1.13 0.276 40 0.028 0.010 7 0.000 4 247.8 22.4 68.8 2.5 15DA-05-14 249 378 0.66 0.245 10 0.020 0.010 3 0.000 3 222.6 16.1 65.8 2.0 15DA-05-15 531 870 0.61 7.852 68 0.278 0.218 5 0.005 3 2 214.3 31.9 1 274.1 28.3 15DA-05-16 1 402 1 041 1.35 0.272 10 0.026 0.013 7 0.000 4 244.4 20.4 87.5 2.6 15DA-05-17 390 541 0.72 0.440 27 0.026 0.026 2 0.000 7 370.4 18.5 166.5 4.2 15DA-05-18 407 508 0.80 0.467 28 0.058 0.016 8 0.000 7 389.3 40.2 107.6 4.6 15DA-05-19 389 2 184 0.18 0.512 15 0.045 0.023 2 0.001 8 419.9 30.2 148.1 11.2 15DA-05-20 736 712 1.03 0.167 70 0.028 0.010 6 0.000 6 157.4 24.5 68.1 3.8 15DA-05-21 309 385 0.80 0.230 90 0.018 0.011 4 0.000 4 210.9 14.5 72.8 2.4 15DA-05-22 217 1 236 0.18 0.351 13 0.015 0.038 7 0.001 2 305.6 11.3 244.6 7.2 15DA-05-23 408 513 0.79 0.182 30 0.015 0.010 8 0.000 3 170.1 13.2 69.5 2.2 15DA-05-24 376 484 0.78 0.218 80 0.017 0.010 4 0.000 3 200.9 14.3 66.5 1.8 15DA-05-25 3 264 2 124 1.54 0.321 50 0.059 0.010 8 0.000 5 283.1 45.5 69.1 3.2 15DA-05-26 2 841 1 572 1.81 0.390 84 0.061 0.014 6 0.001 3 335.0 44.3 93.5 8.0
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表 3 狮泉河地区典中组火山岩主量、微量和稀土元素测试结果
Table 3. Whole-rock geochemical data of the Dianzhong Formation volcanic rocks from Shiquanhe area
样品编号 15DA-01 15DA-02 15DA-05 15DA-06 15DA-07 15DA-09 15TC-01 15TC-02 SiO2 61.65 58.98 55.51 57.62 50.55 58.88 76.34 75.57 Al2O3 16.37 19.47 20.54 19.68 16.76 15.96 13.37 13.85 TFe2O3 4.91 5.33 5.90 6.08 10.82 7.53 0.71 0.76 MgO 2.71 0.80 2.03 2.06 6.91 5.01 0.19 0.36 CaO 6.12 5.01 8.09 8.88 9.34 2.77 0.30 0.34 Na2O 3.79 5.36 5.01 3.22 2.55 5.66 3.41 3.47 K2O 1.48 2.60 1.03 0.98 0.23 0.53 4.95 4.90 MnO 0.07 0.17 0.13 0.11 0.15 0.04 0.03 0.02 TiO2 0.87 1.02 0.68 0.68 0.97 0.86 0.11 0.10 P2O5 0.14 0.30 0.16 0.17 0.12 0.18 0.03 0.03 LOI 2.18 1.06 1.31 0.92 2.20 2.95 0.54 0.58 Total 100.29 100.09 100.40 100.41 100.60 100.38 99.98 99.99 Mg# 56.81 26.21 44.84 44.42 60.44 61.58 38.13 52.62 K2O/Na2O 0.39 0.48 0.21 0.30 0.09 0.09 1.45 1.41 A/CNK 0.86 0.94 0.85 0.87 0.78 1.07 1.16 1.19 V 146.69 97.30 101.68 105.00 258.30 197.87 2.72 4.00 Cr 58.97 1.52 1.24 2.19 54.86 1.79 0.00 1.32 Co 21.45 9.77 12.55 12.67 37.51 25.97 0.22 0.24 Ni 42.03 2.89 2.19 2.80 23.90 10.32 0.72 0.13 Ga 23.66 20.09 10.85 12.43 8.01 9.90 8.01 7.36 Rb 35.80 92.39 59.64 70.07 3.84 20.18 222.33 201.54 Sr 320.10 498.81 320.07 314.31 293.53 431.96 8.15 6.75 Y 15.68 35.53 22.24 24.78 15.61 38.91 24.72 21.34 Zr 170.98 251.11 92.38 106.43 50.68 134.14 107.28 93.45 Nb 8.99 12.86 3.24 3.60 2.08 5.00 21.98 19.84 Cs 0.75 3.80 8.39 7.28 3.45 3.57 2.24 2.33 Ba 520.12 431.86 135.78 192.00 60.85 104.40 82.69 67.26 La 21.93 35.96 10.86 12.43 5.92 13.66 24.83 22.70 Ce 44.60 74.45 22.76 25.71 12.82 35.11 57.20 45.61 Pr 5.79 9.97 3.58 4.04 2.28 5.25 6.34 5.77 Nd 22.44 39.90 15.72 17.64 10.03 22.71 21.64 19.36 Sm 4.20 7.77 3.77 4.07 2.63 5.46 4.43 3.94 Eu 1.22 1.91 1.02 1.11 0.89 1.21 0.38 0.37 Gd 3.56 6.74 3.42 3.84 2.52 5.22 3.82 3.25 Tb 0.57 1.15 0.68 0.75 0.60 1.13 0.70 0.64 Dy 3.11 6.40 4.10 4.56 3.02 6.88 4.23 3.73 Ho 0.60 1.29 0.88 0.96 0.73 1.53 0.87 0.78 Er 1.55 3.32 2.26 2.48 1.64 3.91 2.57 2.29 Tm 0.28 0.61 0.42 0.47 0.43 0.82 0.49 0.44 Yb 1.65 3.88 2.57 2.89 1.91 4.55 3.26 2.83 Lu 0.24 0.57 0.39 0.43 0.39 0.73 0.46 0.42 Hf 4.87 7.42 2.93 3.33 1.69 4.07 4.62 4.16 Ta 0.69 1.00 0.25 0.29 0.14 0.35 1.92 1.73 Pb 13.19 16.30 7.99 5.73 6.10 11.01 23.96 21.51 Th 9.00 14.89 4.48 4.66 2.27 3.85 27.75 25.83 U 1.38 3.48 0.72 0.82 0.15 0.66 2.47 2.16 Eu/Eu* 0.94 0.79 0.85 0.84 1.05 0.68 0.28 0.31 Ce/Ce* 0.95 0.95 0.89 0.88 0.85 1.02 1.09 0.95 Nb/Ta 13.07 12.88 12.93 12.52 15.05 14.18 11.46 11.46 (La/Yb)N 9.56 6.64 3.03 3.08 2.23 2.15 5.47 5.76 (La/Sm)N 3.37 2.99 1.86 1.97 1.45 1.62 3.62 3.72 注:Mg#=100×Mg2+/(Mg2++TFe2+); TFeO=0.899 8×TFe2O3; Eu/Eu*=2EuN/(Sm+Gd) N; Ce/Ce*=2CeN/(La+Pr)N.
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表 4 狮泉河地区典中组火山岩Sr、Nd同位素组成结果
Table 4. Sr and Nd isotope data for the Dianzhong Formation volcanic rocks in the Shiquanhe area
样品编号 Rb(10-6) Sr (10-6) 87Rb/86Sr 87Sr/86Sr (87Sr/86Sr)i Sm Nd 147Sm/144Nd 143Nd/144Nd εNd(t) 地区 资料来源 15DA-05 59.64 320.7 0.539 0.708 172 0.707 672 3.77 15.72 0.144 9 0.512 356 -5.06 狮泉河 本文 15DA-07 3.84 293.5 0.038 0.707 472 0.707 437 2.63 10.03 0.158 4 0.512 401 -4.31 注:t=65.4 Ma, TDM值采用 Depaolo et al.(1990) 两阶段模式年龄; Sm、Rb、Sr和Nd单位为μg/g.
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